WO2015182251A1 - Hydraulic pump mounting structure - Google Patents

Abstract

Provided is a hydraulic pump mounting structure configured so that, with the use of a simple structure having a reduced number of parts, the hydraulic pump mounting structure can effectively reduce the displacement of a hydraulic pump caused by the discharge pressure of hydraulic oil. A hydraulic pump mounting structure comprises: a mounting surface (31) for a hydraulic pump (1), the mounting surface (31) being provided on a transmission casing (30); a pump casing (10) for the hydraulic pump (1) mounted on the mounting surface (31); the discharge port (3) of the hydraulic pump (1), the discharge port (3) being formed protruding from the pump casing (10) and being disposed on a surface different from the mounting surface (31); a discharge opening (4) provided at the discharge port (3) and discharging hydraulic oil; a hydraulic pressure-subjected section (5) provided to the discharge port (3) and subjected to the pressure of hydraulic oil discharged from the discharge opening (4), the pressure acting in the direction opposite the direction toward the discharge opening (4) with both directions lying along the same axis; and a contact section (7c) provided to the hydraulic pressure-subjected section (5) and disposed so as to be capable of coming into contact with the contact receiving section (32c) of the transmission casing (30).

Description

Hydraulic pump mounting structure

The present invention relates to a hydraulic pump mounting structure for supplying hydraulic pressure to a device having a mechanism that is operated by hydraulic pressure of hydraulic oil.

In an automatic transmission (automatic transmission) for a vehicle that has a hydraulic control device (hydraulic control body) and requires high hydraulic pressure, for example, as shown in Patent Document 1, a hydraulic pump (hydraulic pump) is connected to the hydraulic control device. A delivery pipe such as a connection pipe may be used to supply hydraulic oil. In such a structure, the discharge port of the hydraulic pump may be deformed / displaced by the hydraulic reaction force, and the seal member such as an O-ring connecting the delivery pipe may be abnormally worn. In particular, when the hydraulic pump discharges hydraulic oil in a direction perpendicular to the fastening direction of the fixing bolt that fixes the pump casing, the rigidity of the pump casing with respect to the reaction force of the hydraulic pressure is low, and the above-mentioned event is likely to occur. Tend.

Measures against this problem include a structure in which a conventional automatic transmission has a structure in which a pump casing of a hydraulic pump is fixed to a transmission case in parallel with a discharge direction of hydraulic oil by fastening bolts. According to this structure, the displacement of the discharge port due to the discharge pressure of the hydraulic oil can be suppressed to some extent. However, in this structure, the amount of displacement of the rotary shaft of the hydraulic pump (the amount of displacement in the radial direction) due to the variation in the height position of the location where the hydraulic pump is fixed in the transmission case or the tightening axial force of the bolt Becomes larger. In order to suppress the influence of this amount of displacement, the number of gear teeth on the rotating shaft must be reduced or the amount of backlash of the spline fitting portion must be increased. There is a concern. Further, the discharge port of the hydraulic pump may be deformed / displaced only by fixing the bolt to the transmission case by the mutual step of the seating surface to which the pump casing is attached and the variation in the axial force of the mounting bolt.

As another example of an automatic transmission having a conventional structure, a support (stay) for fixing a pump casing of a hydraulic pump to a mounting surface of a hydraulic control device or the like is added. However, in this structure, it is necessary to suppress relative displacement of the pump casing with respect to the mounting surface while allowing a mutual step between the mounting surface and the pump casing due to deformation of the support itself. For this reason, it is not easy to set the thickness and shape of the support. Further, when the hydraulic reaction force acting on the pump casing is large, there is a possibility that the displacement of the pump casing cannot be sufficiently suppressed only by the above-described support.

JP 2013-1000084

The present invention has been made in view of the above points, and an object of the present invention is to make it possible to effectively suppress displacement of a hydraulic pump due to hydraulic oil discharge pressure with a simple configuration with a reduced number of parts. The object is to provide a pump mounting structure.

In order to solve the above-described problems, a hydraulic pump mounting structure according to the present invention is a hydraulic pump (1) mounting structure for supplying hydraulic pressure to a device having a mechanism that is operated by hydraulic oil pressure. The mounting surface (31) for the hydraulic pump (1) provided in the apparatus casing (30) included in the apparatus, the pump casing (10) of the hydraulic pump (1) mounted on the mounting surface (31), and the pump casing (10 ) And a discharge portion (3) of the hydraulic pump (1) disposed on a surface different from the mounting surface (31), and a discharge port for discharging the hydraulic oil provided in the discharge portion (3) (4) and a hydraulic operating portion (provided in the discharge section (3)), wherein the hydraulic pressure of the hydraulic oil discharged from the discharge port (4) acts on the discharge port (4) in the opposite direction on the same axis. 5) and a device provided in the hydraulic operating section (5) Abutment portion which is contactable disposed abutted portion (32c) of pacing (30) and (7c), characterized in that it comprises a.

According to the mounting structure of the hydraulic pump according to the present invention, the hydraulic pressure of the hydraulic oil provided in the discharge portion and discharged from the discharge port acts on the discharge port in the opposite direction on the same axis, A pump casing of the hydraulic pump when the hydraulic oil is discharged from the discharge port of the hydraulic pump. The hydraulic reaction force acting on the hydraulic action portion acts on the hydraulic action portion, and the hydraulic reaction force acting on the hydraulic action portion is received by the contact portion coming into contact with the contacted portion of the apparatus casing. Thereby, when hydraulic fluid is discharged from the discharge port of a hydraulic pump, the moment which arises in the pump casing of a hydraulic pump can be controlled. Therefore, the relative displacement of the discharge portion of the hydraulic pump and the pump casing with respect to the device casing can be effectively suppressed.

In the hydraulic pump mounting structure according to the present invention, the through hole (8) formed in the discharge part (3) and extending from the discharge port (4) to the hydraulic action part (5) along the axial direction (L2). The hydraulic operating portion (5) includes an opening (6) that communicates the through hole (8) with the outside, and a lid member (7) that closes the opening (6). The lid member (7) The outer periphery (7f) is press-fitted and attached to the inner periphery (6f) of the opening (6) via the seal member (7d), and is opposite to the opening (6) of the lid member (7). An abutting portion (7c) may be provided at the end portion (7a).

According to this configuration, since the cover member receives the hydraulic reaction force acting on the hydraulic action portion, the discharge portion can be configured not to receive the hydraulic reaction force directly. That is, the lid member can be moved (stroked) relative to the opening of the discharge portion in the axial direction, and when the hydraulic oil is discharged from the discharge port, the lid member that has received the hydraulic reaction force is relative to the opening. By moving, the contact portion of the lid member comes into contact with the contacted portion of the apparatus casing. Thereby, the hydraulic reaction force is transmitted to the apparatus casing via the lid member. For this reason, a moment due to the hydraulic reaction force is not generated in the pump casing of the hydraulic pump, and a significant displacement suppression effect of the hydraulic pump can be obtained compared to the conventional structure.

Further, in the pump mounting structure according to the present invention, a step portion (9) facing the open end side of the opening (6) in the axial direction (L2) is formed on the inner periphery of the opening (6). The lid member (7) may be disposed so as to be able to contact the stepped portion (9) on the open end side with respect to the stepped portion (9) in the inner periphery of the opening (6).

According to this configuration, since the lid member can move in the axial direction only between the stepped portion and the contacted portion, the displacement of the pump casing due to the hydraulic pressure of the hydraulic oil discharged from the discharge port by the relative movement of the lid member. It is possible to prevent the lid member from being mistakenly removed from the opening or greatly moving beyond an allowable amount while effectively suppressing the above.

In addition, the code | symbol in said parenthesis shows the code | symbol of the component in embodiment mentioned later as an example of this invention.

According to the mounting structure of the hydraulic pump according to the present invention, the displacement of the hydraulic pump due to the hydraulic oil discharge pressure can be effectively suppressed with a simple configuration with a reduced number of parts.

It is a front view which shows the hydraulic pump attached with the attachment structure concerning one Embodiment of this invention. It is a side view which shows the hydraulic pump attached with the attachment structure concerning one Embodiment of this invention. It is the perspective view which showed a pump casing of a hydraulic pump, and a part of transmission casing of a transmission with the cross section.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 are views showing a hydraulic pump 1 attached with an attachment structure according to an embodiment of the present invention. FIG. 1 is a front view, and FIG. 2 is a side view. FIG. 3 is a perspective view showing in cross section a part of the pump casing 10 of the hydraulic pump 1 and the transmission casing 30 of the transmission.

The mounting structure of the hydraulic pump 1 according to the present embodiment is a mounting structure of the hydraulic pump 1 for supplying hydraulic pressure to a hydraulic control device (control body) included in the transmission (the whole is not shown). As shown in FIGS. 1 and 2, the mounting structure includes a substantially flat mounting surface 31 for mounting the hydraulic pump 1 provided in the transmission casing 30 and a pump of the hydraulic pump 1 mounted on the mounting surface 31. A casing 10 and a discharge port (discharge section) 3 of the hydraulic pump 1 formed so as to protrude from the pump casing 10 are provided. Further, the discharge port 3 has a discharge port 4 for discharging hydraulic oil, and a reaction force (hydraulic reaction force) P2 of the hydraulic oil P1 discharged from the discharge port 4 on the same axis L2 with respect to the discharge port 4. And a hydraulic pressure acting section 5 acting in the opposite direction.

The discharge port 3 of the hydraulic pump 1 is arranged in a plane different from the plane to which the mounting surface 31 belongs. The discharge port 3 is provided at a position opposite to the mounting surface 31 with respect to the center of the hydraulic pump 1.

Further, a chain 38 for transmitting rotation to a rotating shaft (not shown) of the hydraulic pump 1 is attached to the transmission casing 30. The chain 38 is bridged between a rotating shaft (not shown) that rotates by a driving force of a driving source such as an engine (not shown) and the rotating shaft of the hydraulic pump 1.

Also, a pipe (oil passage) 44 for supplying hydraulic oil discharged from the discharge port 4 of the hydraulic pump 1 to a mechanism that operates by hydraulic pressure of hydraulic oil such as a transmission hydraulic control device (not shown), A connecting pipe (connecting member) 54 for connecting the discharge port 4 and the pipe 44 is provided. As shown in FIG. 3, the connecting pipe 54 is attached by pressing the outer peripheral surface 54 f near the upper end thereof into the inner peripheral surface 4 f of the discharge port 4 of the hydraulic pump 1 via an O-ring (seal member) 54 d. The outer peripheral surface 54f in the vicinity of the lower end thereof is press-fitted and attached to the inner peripheral surface 44f of the pipe 44 through an O-ring (seal member) 54g.

In the discharge port 3, a through-hole 8 extending from the discharge port 4 to the hydraulic action part 5 along the axial direction L2 is formed. The hydraulic operation unit 5 includes an opening 6 that communicates the through hole 8 with the outside, and a lid member 7 that closes the opening 6. That is, the discharge port 3 has a discharge port 4 that opens downward at the lower end, an opening 6 that opens upward at the upper end, and the discharge port 4 and the opening 6 are linearly formed along the vertical direction. And a through-hole 8 communicating with the. In addition, a pipe (oil passage) 11 through which hydraulic oil flowing out from the inside of the hydraulic pump 1 passes is communicated with a side surface near the middle in the longitudinal direction of the through hole 8.

The lid member 7 is a substantially cylindrical member whose longitudinal direction is the vertical direction, and the outer peripheral surface 7f of the lower end portion 7b is press-fitted into the inner peripheral surface 6f of the opening 6 via an O-ring (seal member) 7d. It is attached. Moreover, the upper surface of the upper end part (end part on the opposite side to the opening part 6) 7a of the cover member 7 is a planar contact surface (contact part) 7c. The contact surface 7c is disposed to face a flat contacted surface (contacted portion) 32c provided on the lower surface side of the boss portion 32 of the transmission casing 30, and contacts the contacted surface 32c. Contact (surface contact) is possible.

As shown in FIG. 3, a stepped surface (stepped portion) 9 is formed on the inner peripheral surface 6f of the opening 6 so as to face the upper side in the axial direction L2 (the open end 6a side of the opening 6). That is, the inner peripheral surface 6f of the opening 6 has a larger diameter on the upper side of the step surface 9 than on the lower side. The lid member 7 is arranged so as to be able to contact the step surface 9 on the upper side (open end 6a side) of the step surface 9 on the inner peripheral surface 6f of the opening 6. That is, the lid member 7 is brought into contact with the step surface 9 in a state where the lid member 7 is moved (slid) to the lower side in the opening 6.

Further, as shown in FIGS. 1 and 2, the pump casing 10 is attached to the attachment surface 31 by fastening a plurality of fixing bolts 35. The fastening direction L1 of the fixing bolt 35 shown in FIG. 2 is the horizontal direction (horizontal direction) of FIG. 2, and the surface direction of the mounting surface 31 is the vertical direction (vertical direction) of FIG. The fastening direction L <b> 1 is a direction orthogonal to the surface direction of the mounting surface 31. Furthermore, the axial direction L2 of the discharge port 3 here is the vertical direction (vertical direction) in FIG. Therefore, the axial direction L2 of the discharge port 3 and the fastening direction L1 of the fixing bolt 35 are perpendicular to each other.

In order to attach the pump casing 10 of the hydraulic pump 1 configured as described above to the attachment surface 31 of the transmission casing 30, the lid member 7 is press-fitted and attached to the opening 6 in advance via the O-ring 7d. In this state, the pump casing 10 is attached to the attachment surface 31 of the transmission casing 30 by fastening the fixing bolt 35. As a result, the contact surface 7 c provided on the upper end portion 7 a of the lid member 7 is disposed to face the contact surface 32 c provided on the flange portion 32 of the transmission casing 30 with a slight gap. Accordingly, the lid member 7 is in surface contact with the lower limit position where the lower end portion 7b abuts on the stepped surface 9 of the opening 6 and the contact surface 7c provided on the flange portion 32 with the abutment surface 7c of the upper end portion 7a. A stroke is possible in the vertical direction (axial direction L2) between the upper limit position and the abutting upper limit position.

In the hydraulic pump 1 configured as described above, hydraulic oil is discharged from the discharge port 4 of the discharge port 3 by the operation of the hydraulic pump 1. At this time, the hydraulic oil discharged from the discharge port 4 is discharged in the direction directly below in FIGS. A reaction force (discharge reaction force) P2 against the hydraulic pressure P1 acts on the hydraulic oil discharged from the pump casing 10 against the hydraulic pressure (discharge force) P1 of the hydraulic oil discharged from the discharge port 4. The reaction force P2 acts from the discharge port 4 in the upward direction. And in the hydraulic pump 1 of this embodiment, this reaction force P2 acts on the cover member 7 with which the hydraulic action part 5 of the discharge port 3 is provided. As a result, the lid member 7 is urged and moved in the directly upward direction (axial direction L2). The movement of the lid member 7 stops at a position where the contact surface 7 c contacts the contacted surface 32 c of the transmission casing 30. On the other hand, when the discharge pressure P1 of the hydraulic oil discharged from the discharge port 3 decreases, the reaction force P2 acting on the lid member 7 decreases. The stroke of the lid member 7 is such that a minute displacement of the flange portion 32 (contacted surface 32c) due to hydraulic pressure, a minute dimensional variation of the flange portion 32 (contacted surface 32c), and a variation in assembly position. This is effective for effectively absorbing the influence such as (dimensional error when the hydraulic pump 1 is mounted).

As described above, in the mounting structure of the hydraulic pump 1 according to the present embodiment, the hydraulic pressure of the hydraulic oil provided in the discharge port 3 and discharged from the discharge port 4 is opposite to the discharge port 4 on the same axis L2. Of the hydraulic pump 1 is provided with a hydraulic acting portion 5 acting on the hydraulic pressure acting portion 5 and an abutting surface 7c provided in the hydraulic acting portion 5 so as to be able to abut against the abutted surface 32c of the transmission casing 30. The hydraulic reaction force P2 acting on the pump casing 10 of the hydraulic pump 1 when the hydraulic oil is discharged from the discharge port 4 acts on the hydraulic action portion 5, and the hydraulic reaction force P2 acting on the hydraulic action portion 5 comes into contact. The surface 7c is received by contacting the contacted surface 32c of the transmission casing 30. Thereby, the moment which arises in the pump casing 10 of the hydraulic pump 1 when hydraulic fluid is discharged from the discharge port 4 of the hydraulic pump 1 can be suppressed. Therefore, relative displacement of the discharge port 3 of the hydraulic pump 1 and the pump casing 10 with respect to the transmission casing 30 can be effectively suppressed.

Further, in the mounting structure of the hydraulic pump 1 according to the present embodiment, a through hole 8 is formed in the discharge port 3 and extends from the discharge port 4 to the hydraulic action part 5 along the axial direction L2. An opening 6 that communicates with the through hole 8 to the outside, and a lid member 7 that closes the opening 6 are provided. The lid member 7 has an outer peripheral surface 7f attached to the inner peripheral surface 6f of the opening 6 through an O-ring 7d, and is attached to the end of the lid member 7 opposite to the opening 6 (upper end). Part) 7a is provided with a contact part 7c.

According to this configuration, the cover member 7 is configured to receive the hydraulic reaction force acting on the hydraulic operation portion 5, so that the discharge port 3 does not directly receive the hydraulic reaction force. That is, the lid member 7 can be moved relative to the opening 6 of the discharge port 3 in the axial direction (stroke), and when the hydraulic oil is discharged from the discharge port 4, the lid member 7 that receives the hydraulic reaction force By a relative movement with respect to the opening 6, the contact surface 7 c of the lid member 7 abuts against the contacted surface 32 c of the transmission casing 30. As a result, the hydraulic reaction force is transmitted to the transmission casing 30 via the lid member 7. For this reason, a moment due to the hydraulic reaction force is not generated in the pump casing 10 of the hydraulic pump 1, and a significant displacement suppression effect of the hydraulic pump can be obtained compared to the conventional structure. Further, since the displacement of the hydraulic pump 1 can be suppressed, abnormal wear occurs in the O-ring 54d interposed between the discharge port 4 and the connection pipe 54 and the O-ring 54g interposed between the connection pipe 54 and the pipe 44. Can be effectively prevented.

Note that the pump mounting structure of the present embodiment is related to the prior art in which the bolt is fastened in parallel with the discharge direction in that it receives a hydraulic reaction force on the contacted surface 32c of the transmission casing 30, but this embodiment With this mounting structure, it is possible to transmit the hydraulic reaction force directly to the transmission casing 30 via the lid member 7 without passing through the discharge port 3. Therefore, the displacement suppression effect of the hydraulic pump 1 can be obtained more reliably than the conventional structure. In addition, since the hydraulic reaction force can be received directly above the discharge port 3, the bolt for fixing the pump casing 10 is attached to the periphery of the discharge port 3 as compared with the conventional technique in which the bolt is fastened in parallel with the discharge direction. There is no need to provide a boss. Therefore, it is possible to efficiently arrange the hydraulic pump 1 by reducing the installation space accordingly.

Further, in the pump mounting structure of the present embodiment, the stepped surface 9 facing the open end 6a side of the opening 6 in the axial direction L2 is formed on the inner peripheral surface 6f of the opening 6, and the lid member 7 is The opening 6 is disposed so as to be able to contact the step surface 9 on the open end 6a side of the step surface 9 on the inner peripheral surface 6f of the opening 6.

According to this configuration, the lid member 7 can move in the axial direction only between the stepped surface 9 and the abutted surface 32c, so that the hydraulic oil discharged from the discharge port 3 by the relative movement of the lid member 7 can be achieved. While effectively suppressing the displacement of the pump casing 10 due to the hydraulic pressure, it is possible to prevent the lid member 7 from being accidentally detached from the opening 6 or greatly moving beyond the allowable amount.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Deformation is possible.

Claims (3)

A hydraulic pump mounting structure for supplying hydraulic pressure to a device having a mechanism operated by hydraulic pressure of hydraulic oil,
A mounting surface for the hydraulic pump provided in a device casing included in the device;
A pump casing of the hydraulic pump attached to the attachment surface;
A discharge portion of the hydraulic pump that is formed to protrude from the pump casing and is disposed on a surface different from the mounting surface;
A discharge port provided in the discharge unit for discharging hydraulic oil;
A hydraulic operating portion that is provided in the discharge portion, and in which hydraulic pressure of hydraulic oil discharged from the discharge port acts in the opposite direction on the same axis with respect to the discharge port;
A mounting structure for a hydraulic pump, comprising: an abutting portion provided in the hydraulic acting portion and arranged so as to be able to abut against an abutted portion of the apparatus casing. A through hole formed in the discharge portion and extending from the discharge port along the axial direction of the axis to the hydraulic pressure action portion;
The hydraulic operating portion includes an opening that communicates the through hole to the outside, and a lid member that closes the opening.
The lid member is attached by press-fitting the outer periphery thereof to the inner periphery of the opening via a seal member,
The hydraulic pump mounting structure according to claim 1, wherein the contact portion is provided at an end portion of the lid member opposite to the opening portion. On the inner periphery of the opening, a step is formed that faces the open end of the opening in the axial direction.
3. The hydraulic pump according to claim 1, wherein the lid member is disposed so as to be able to contact the stepped portion on the open end side with respect to the stepped portion on the inner periphery of the opening. Mounting structure.

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