JPH07299765A - Pulley puller - Google Patents

Abstract

PURPOSE:To allow a single operator to conduct the pulley separating operations simply and safely by fitting a fit piece in an opening provided in a base body after a lock bolt is removed, and pulling the pulley in the direction of separating from the shaft using a screw shaft of a pressing piece installed on the fit piece. CONSTITUTION:A bolt 26 is inserted in a through hole 25 provided at the periphery of a disc-shaped base body 21 and screwed fast to a bolt hole 24 in a pulley 23, and thereby the base body 21 is located to the pulley 23. A wrench 34 is inserted in an opening 30 in the center of the base body 21 and rotated, and thereby a lock bolt 29 and washer 28 screwed fast to a threaded hole 27 in a shaft 22 supporting the pulley 23 are removed. At this time, a fit piece 35 is engaged by a coupling hole 33 provided at the periphery of the opening 30 so that the shaft 22 and pulley 23 are hindered from turning together. The fit piece 35 is fitted in the opening 30, and the tip of a screw shaft 37 is engaged by the threaded hole 27, and then the screw shaft 37 is rotated in the direction of pressing to the shaft 22, and thereby the pulley 22 is separated.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a pulley puller used to disengage a pulley from a shaft.

During maintenance or repair of an automobile, the work of removing the crank pulley at the front of the engine from the shaft is performed. Although different depending on the vehicle model, this type of pulley 1 is generally arranged with no gap between the engine body 2 (see FIGS. 8 and 11) and is supported by the shaft 3. The shaft 3 which covers and supports the pulley 1 is provided with a screw hole 5 for the lock bolt 4 at the shaft end, and the lock bolt 4 is screwed into the hole 5 via a lock washer 6,
The pulley 1 is supported at its end surface so as not to be separated from the shaft 3.

To remove the pulley 1 from the shaft 3 at the time of maintenance or the like, first, the lock bolt 4 is removed from the screw hole 5. To remove the lock bolt 4, a wrench 8 for removing the lock bolt is attached to the head of the bolt 4 as shown by the arrow in FIG. 9, and the wrench 8 is fixed in this state. Then, the engine is started to rotate the shaft 3 and the pulley 1 mounted on the shaft 3 (direction of arrow A in FIG. 9). Then, the lock bolt 4 fixed by the wrench 8 is removed from the screw hole 5 by the rotation of the shaft 3.

After the lock bolt 4 and the stop washer 6 are disengaged from the shaft 3, the work of separating the pulley 1 from the shaft 3 is performed by using the pulley puller 9 shown in FIG. 10 or 11. This pulley pooler 9
Is formed by screwing a screw shaft 11 into the central portion of the base body 10, and elongated holes 12 are formed at two locations outside the screw shaft 11 of the base body 10. Each long hole 12
The heads of the long bolts 13 are inserted into the bolts, and the tips of these long bolts 13 are screwed into the bolt holes 14 for pulley removal provided in each end face of the pulley 1 in advance (see FIG. 9).

Pulley 1 from shaft 3 by pulley puller 9
As shown in FIG. 10, the base 10 is fixed with the wrench 15 and the screw shaft 1 is removed with the wrench 16.
It is assumed that a rotational force is applied to 1 and a pressing force in the axial direction is applied to the shaft 3 from the floating portion 17 at the tip of the screw shaft 11. Then, the pulley 1 screwed to the long bolt 13 is pulled in the axial direction, and the pulley 1 can be separated from the shaft 3.

[0006]

However, in the above-mentioned conventional work, as shown in FIG.
The work of mounting the wrench 8 on the head of the engine and starting the engine to remove the bolt 4 instantaneously removes the bolt 4 by the engine starting force, but this is because the shaft 3 rotates vigorously. The pulley 1 mounted on the shaft is also driven by the shaft 3, and in some cases, the lock bolt 4 is removed from the screw hole 5, and at the same time, the pulley 1 is violently removed from the shaft 3. This kind of work is very dangerous for the worker. Especially, since one worker operates the engine and the other worker attaches the wrench 8 to the bolt 4 and fixes the bolt 4, the work is performed. , If the timing of the engine start and engine stop signals by both workers does not go well, the engine will continue to rotate forever,
There was a risk that the pulley 1 would fly out to the shaft end side.

From such a risk, a method in which one operator mounts the wrench 8 on the head of the lock bolt 4 and rotates the wrench 8 in the direction of detaching the bolt is possible. The shaft 3 and the pulley 1 mounted on the shaft 3 are driven in the same direction along with the rotating work, and it is impossible to perform the desired work.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to easily and safely perform the work of removing a pulley from a shaft by one operator without starting the engine. It is a thing.

[0009]

In order to achieve the above object, the present invention has a pulley supported by a shaft and fixed by a lock bolt whose end is screwed to the shaft end. , A pulley puller that is pulled away from the shaft by pulling in the axial direction, is provided with an insertion hole for a fixing bolt that is arranged so as to face the pulley and that can be screwed into a plurality of bolt holes provided at a predetermined peripheral portion on the end face of the pulley, The fixing bolt inserted into the insertion hole is positioned so as to face the pulley in a screwed state with respect to the bolt hole, and in the positioned state, the wrench for removing the lock bolt can be inserted into the facing position of the lock bolt that is cast on the shaft end. An opening portion is further provided, and a fixing portion coupling portion is provided on a predetermined peripheral portion with respect to the opening portion to prevent the pulley from being circulated in a state where the fixing bolt is coupled with the pulley. A flat plate-like base body, a wrench for removing the lock bolt is inserted into the opening of the base body, the lock bolt is removed, and then the fitting body is fitted into the opening, and the central opening of the base body is fitted. Is provided with a screw shaft that is screwed along the axial direction of the shaft that is positioned to face each other, and the pulley that is coupled to the fixing bolt is axially rotated by the screwing of the screw shaft in the pressing direction with respect to the shaft. And a pressing body that exerts a pulling force in the detaching direction with respect to.

[0010]

According to the present invention, the fixing bolts are first inserted into the respective insertion holes of the base body in a state in which the whole flat plate-shaped base body is arranged to face the pulley, and the fixing bolts are screwed into the bolt holes provided on the end face of the pulley. Then, it becomes possible to position the base body opposite to the pulley.

At the center of the base body, there is provided an opening through which a wrench for removing the lock bolt for removing the lock bolt attached to the shaft end that covers the pulley can be inserted. By rotating the attached wrench in the bolt removing direction, the bolt can be removed.
A coupling portion of the fixture is provided on a predetermined peripheral portion of the base body with respect to the opening portion. The worker connects the fixture to this joint,
By holding the fixing tool, it is possible to prevent the shaft and the pulley from rotating around when the lock bolt is removed by the wrench.

In this way, the wrench for removing the lock bolt is inserted into the opening of the base body, and after the lock bolt is removed, the fitting body is fitted into the opening, and the work of removing the pulley from the shaft of the pulley is performed. It becomes possible. The fitting body is provided with a pressing body that exerts a pressing force on the shaft in a fitted state with respect to the opening portion, and the pressing body is a screw shaft along the axial direction of the shaft that is positioned to face each other. The tip of this screw shaft is abutted against the end of the shaft and screwed in the direction of pressing against the shaft. Then, the pulley to be coupled is pulled in the detaching direction along the shaft by the fixing bolt inserted into the insertion hole of the base body. In such work,
When the pressing force is applied to the shaft by the screw shaft, it is possible to connect the fixture to the connecting portion so that the shaft does not rotate along with the rotation of the screw shaft against which the shaft abuts.

As described above, according to the pulley puller of the present invention, it is possible for one operator to easily and safely remove the pulley from the shaft without starting the engine.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show a pulley puller according to an embodiment of the present invention. This pulley puller 20 is provided with a base body 21 having a generally flat disk shape, and the base body 21 has a shaft 22.
It is used in a state of being arranged so as to face the pulley 23 supported by. Two bolt holes 24 for removing the pulley are preliminarily provided at two peripheral portions on the end face of the pulley 23 (see FIG. 2), and the base body 21 arranged to face the pulley 23 corresponds to the bolt holes 24. The insertion hole 25 (long hole) is formed at the position (see FIG. 1). As shown in FIG. 2, fixing bolts 26 are inserted into the respective insertion holes 25.
6 is a bolt hole 2 which is cast at the end face of the pulley 23.
The base 21 is positioned so as to face the pulley 23 in the screwed state.

The shaft 22 for supporting the pulley 23 is provided with a screw hole 27 at the end of the shaft (see FIG. 2).
A lock bolt 29 is screwed onto the 7 through a stop washer 28. A circular opening 30 is formed at the center of the base body 20 that is positioned to face the pulley 23 (see FIG. 1). On the surface of the opening 30 facing the pulley 23,
Recessed step portions 31 are formed at two locations in the circumferential direction (see FIG. 1). A notch 32 is formed in each step 31,
The notch 32 is open to the side of the base body 20 that does not face the pulley 23. A coupling hole 33 of a fixed wrench is opened at two locations on the base body 20 with respect to the opening 30 (see FIG. 1).

When the base body 21 is positioned with respect to the pulley 23 by screwing the fixing bolts 26 into the bolt holes 24 as shown in FIG. 2, the opening 30 is provided as shown in FIG.
Insert the wrench 34 for removing the lock bolt into the
4 is attached to the head of the lock bolt 29. In this state, it is possible to rotate the wrench 34 in the bolt removing direction and remove the lock bolt 29 from the screw hole 27. At this time, a fixed wrench 35 (square wrench) may be coupled and held in the coupling hole 33 so that the shaft 22 and the pulley 23 are not rotated by the rotation of the wrench 34 (see FIG. 1). When the lock bolt 29 and the lock washer 28 are separated from the shaft 22 through the screw hole 27, the shaft 2
Detachment work of the pulley 23 from the 2 is performed.

The pulley puller 20 is provided with a fitting body 35 that can fit into the opening 30 (see FIG. 1). Fitting body 35
Is formed by screwing a screw shaft 37 as a pressing body at the center of a support body 36 having a generally cylindrical shape, and the screw shaft 37 is slidable in the X direction by screwing with respect to the support body 36 (FIG. 1). reference). The fitting body 35 is cast with the screw shaft 37 corresponding to the axial direction of the shaft 22, and fitted into the opening 30. On the outer peripheral portion of the cylindrical support 36, fitting protrusions 38 are provided at positions separated by an angle of 180 degrees. Mating body 3
5 is fitted into the opening 30, the support 36 is inserted into the opening 30 as shown in FIG. 3 and FIG.
8 is inserted into the notch 32 of the step 31. Subsequently, the support body 36 is rotated in the direction of arrow B (see FIGS. 1 and 6) so that each fitting convex portion 38 is moved to the corresponding step 31 (fitting concave portion).
To fit. At this time, the step portion 31 is provided with the positioning convex portion 39 shown in FIG.
Is positioned on the stepped portion 31 in a state of overcoming the convex portion 39. In this way, when the fitting body 35 is fitted into the opening 30 and positioned, next, the pulley puller 20
Thus, the work of removing the pulley 23 can be performed.

To remove the pulley 23, as shown in FIGS. 4 and 5, the handle 40 is attached to the base end of the screw shaft 37, and the screw shaft 37 is screwed to the opposite shaft 22 side. Do it. That is, when the screw shaft 37 is screwed toward the shaft 22, the free portion 41 at the tip end abuts on the screw hole 27 at the shaft end, and as a result, the tip end portion of the screw shaft 37 moves toward the shaft 22. The pressing force in the direction of arrow C acts. When the handle 40 is rotated in this manner and a pressing force is applied to the shaft 22 in the axial direction, the screw shaft 37 is screwed to cause the shaft 22 and the pulley 23 to rotate.
There is a fear that they will be circulated. Therefore, when removing these pulleys, the fixing wrench 35 is inserted into the coupling hole 33.
(Square wrench) can be coupled to prevent the pulley puller 20 itself from being driven by the rotation of the handle 40. Thus, the screw shaft 3 as the pressing body
When 7 exerts a pressing force on the shaft 22, the fixing bolt 26 inserted into the insertion hole 25 of the base body 21 pulls the pulley 23 to be coupled in the detaching direction which is the axial direction, and the pulley is rotated with respect to the shaft 22. 23 will be released.

Next, the operation of the above embodiment will be described. As described above, according to the pulley puller 20, the fixing bolts 26 are inserted into the respective bolt insertion holes 25 (long holes) of the base 21 in a state where the entire disk-shaped base 21 is arranged to face the pulley 23, and the fixing bolts are inserted. 26 can be screwed into the bolt hole 24 provided on the end surface of the pulley 23, and the base 21 can be positioned to face the pulley 23.

At the center of the base 21, these pulleys 2
3, an opening 30 is formed through which a wrench 34 for removing the lock bolt can be inserted, and the wrench 34 is attached to the head of the lock bolt 29 screwed to the shaft end. The bolt 29 can be removed by rotating 34 in the bolt detaching direction. At this time, the wrench 35 is coupled to the coupling hole 33, so that it is possible to prevent the shaft 22 and the pulley 23 from being provided together when the lock bolt 29 is detached.

In this way, the wrench 34 for removing the lock bolt is inserted into the opening 30 of the base body 21, and when the lock bolt 29 and the stopper washer 28 are removed, the fitting body 35 is fitted into the opening 30 to fit the fitting body. By means of 35, it becomes possible to perform the work of separating the pulley 23 from the shaft 22. Mating body 3
5 is provided with a screw shaft 37 that exerts a pressing force in the axial direction on the shaft 22 in a fitted state with respect to the opening 30, and the tip end (actually, the floating part 41) of the screw shaft 37 is connected to the end of the shaft 22. By abutting against the portion (screw hole 27) and screwing the screw shaft 37 in the pressing direction against the shaft 22, the pulley 23 can be separated from the shaft 22. That is, the insertion hole 25 of the base 21
The fixing bolt 26 is inserted into the (long hole), and the pulley 23 to which the fixing bolt 26 is screwed is pulled in the axial direction,
It is possible to disengage from the shaft 22. In these operations, the shaft 22 and the pulley 23, which are driven by the rotation of the screw shaft 37 and abut against this,
It is possible to couple the wrench 35 to the coupling hole 33 so that the wrench 35 does not go around. Thus, according to this embodiment,
Unlike the conventional pulley puller, it is not necessary to start the engine when removing the lock bolt, and a single worker can consistently perform from the removal of the lock bolt 29 to the removal of the pulley 23. Two
It is possible to perform the detachment work of 3.

FIG. 7 relates to another embodiment of the present invention and shows a modification of the base 21 of the pulley puller 20 according to the above embodiment. A step portion 42 (fitting concave portion) along the circumferential direction is provided on the base body 21 on the surface facing the pulley 23.
Is formed. Notches 32 are formed in the step portion 42 at two locations in the circumferential direction so that the fitting protrusions 38 of the fitting body 35 according to the embodiment can be inserted therethrough. Further, a projection 43 is provided at a position adjacent to the cutout 32 in each step 42, and the fitting projection 38 that is inserted from the cutout 32 and rotated in the arrow B direction is provided in this step 42. Protrusion 43
It is stopped at the abutment position with and the fitting body 35 can be fitted. Other configurations and operations are similar to those of the above-mentioned embodiment.

As described above, according to the present invention, one operator can easily and safely remove the pulley from the shaft without starting the engine.

[Brief description of drawings]

FIG. 1 is a perspective view showing a pulley puller according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a detaching operation of a lock bolt using a pulley puller.

FIG. 3 is a sectional view showing a positioning state of a base body with respect to a pulley.

FIG. 4 is a cross-sectional view showing a state in which a pressing force acts on a shaft by a screw shaft.

FIG. 5 is a perspective view showing a state in which a screw shaft is screwed by a handle.

FIG. 6 is a perspective view showing a state in which the fitting body is fitted to the base body.

FIG. 7 is a perspective view showing a base body of a pulley puller according to another embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a conventional pulley shaft mounting state.

FIG. 9 is a perspective view showing a detaching operation of a conventional lock bolt.

FIG. 10 is a perspective view showing a state in which a pulley is removed by a conventional pulley puller.

FIG. 11 is a sectional view of the same.

[Explanation of symbols]

 1, 23 Pulley 2 Engine body 3, 22 Shaft 4, 29 Lock bolt 5 Screwing hole 6, 28 Stop washer 8, 34 Wrench (for removing lock bolt) 9, 20 Pulley puller 10, 21 Base 11, 37 Screw shaft 12, 33 long hole 13 long bolt 14, 24 bolt hole 15 spanner 16, 35 wrench (for preventing shunting) 17, 41 floating part 25 bolt insertion hole 26 fixing bolt 27 screwing hole 30 opening part 31, 42 step part (fitting) Recessed portion) 32 Notch 35 Fitting body 36 Support body 38 Fitting convex portion 39 Convex portion 40 Handle 43 Protrusion

[Procedure amendment]

[Submission date] January 25, 1995

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be amended] Title of invention

[Correction method] Change

[Correction content]

Title of invention Pulley puller

Claims (2)

[Claims] 1. A pulley puller detached from a shaft by removing the lock bolt and pulling it in the axial direction from a pulley supported on a shaft and fixed by a lock bolt whose end is screwed to the shaft end. A plurality of bolt holes, which are arranged to face each other and are provided on a predetermined peripheral portion of the end surface of the pulley, can be screwed into the bolt holes, and the fixing bolts inserted into the through holes are screwed into the bolt holes. Positioned opposite the pulley,
An opening for allowing a wrench for removing the lock bolt to be inserted is provided at a position opposite to the lock bolt cast on the shaft end in the positioned state, and further, a predetermined peripheral portion with respect to the opening is connected to the pulley by a fixing bolt. In, in, a flat plate-shaped base body provided with a coupling portion of a fixture for preventing the pulley from rotating around, and a wrench for removing a lock bolt is inserted into an opening portion of the base body.
After removing the lock bolt, the fitting body fitted in the opening and the fitting body fitted in the opening at the center of the base body are screwed and screwed along the axial direction of the shaft positioned to face each other. A pulley puller comprising: a screw shaft having a screw shaft, and a pressing member that exerts a pulling force on a pulley coupled to a fixing bolt in a detaching direction with respect to the shaft by screwing the screw shaft in a pressing direction with respect to the shaft. 2. The fitting body fitted into the opening of the base body is provided with a fitting convex portion at a predetermined peripheral portion with respect to a center supporting the screw shaft, while the fitting convex portion is provided in the opening portion of the base body. The pulley puller according to claim 1, further comprising a fitting recess that can be fitted to the portion.