TWM496701U - Hydraulic cylinder and mandrel thereof - Google Patents

Description

Hydraulic cylinder and its mandrel

The present invention relates to a hydraulic cylinder, and in particular to a hydraulic cylinder with a protective layer and a mandrel thereof.

The conventional hydraulic cylinder has a cylinder and a mandrel that is accommodated in the cylinder. The mandrel can reciprocate in the cylinder, and during the movement, the mandrel needs to continuously rub against the inner wall surface of the cylinder. Therefore, the mandrel must have sufficient wear resistance and strength, and in order to meet the above requirements, the mandrel is mostly made of a material having wear resistance and strength.

However, the portion of the mandrel that needs to be rubbed against the cylinder body only occupies a part of the overall volume. If the portion of the mandrel that is not used for friction is moved to the friction portion that requires wear resistance and strength, the same material will be used. Increase the overall cost of the mandrel. And when the used mandrel produces a certain amount of wear, there will be a waste that must be repaired and must be discarded.

Therefore, the creator feels that the above-mentioned deficiency can be improved. He is devoted to research and cooperates with the application of theory, and finally proposes a creation that is reasonable in design and effective in improving the above-mentioned deficiency.

The present embodiment is to provide a hydraulic cylinder and a mandrel thereof, which can effectively solve the problems caused by the mandrel of a conventional hydraulic cylinder.

The present invention provides a hydraulic cylinder comprising: a cylinder having an inner wall surface, and the inner wall surface enclosing an operating space defining an opening and extending inwardly from the opening; a mandrel defining a central axis The mandrel is axially movable along the center The mandrel is movably disposed in the operating space of the cylinder, and the mandrel includes: a shaft body including a large diameter section and a small diameter section integrally extending from the large diameter section, the outer surface of the small diameter section and the The inner wall surface of the cylinder body is separated by a gap, and the small diameter section includes an end portion away from the large diameter section, the end portion of the small diameter section is located at an opening of the cylinder body; and a protective layer is welded on the The outer surface of the large diameter section of the shaft body, the wear resistance of the sheath layer is greater than the wear resistance of the shaft body, and the facing layer substantially abuts against the inner wall surface of the cylinder body; The end portion of the small diameter section; and a set of connecting modules disposed at the opening of the cylinder and at least partially between the outer surface of the small diameter section and the inner wall surface of the cylinder, and the sleeve The connecting module abuts substantially on the outer surface of the small diameter section and the inner wall surface of the cylinder without a gap.

The present invention further provides a mandrel of a hydraulic cylinder, which defines a central axis, the mandrel includes: a shaft body including a large diameter section and a small diameter section integrally extending from the large diameter section; and a copper coating a layer is welded on an outer surface of the large diameter section of the shaft body, the copper layer is an annular structure centered on the central axis, and a radius of the copper layer is a maximum of each part of the mandrel The radius, the wear resistance of the facing layer is greater than the wear resistance of the shaft body.

In summary, in the hydraulic cylinder provided by the present embodiment, the mandrel is formed by welding a protective layer (copper layer) to a large diameter section of the shaft body, thereby comparing the shaft body of the mandrel. In the case of the facing layer, a material with low wear resistance and low strength can be selected to reduce the wear of the mandrel and the inner wall surface of the cylinder, so as to improve the utilization and life of the mandrel, thereby avoiding the necessity of abandoning the mandrel due to wear. Waste of things.

In order to further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings are only for reference and explanation, and are not intended to limit the scope of the present invention. .

100‧‧‧Hydraulic cylinder

1‧‧‧Cylinder

11‧‧‧ inner wall

12‧‧‧ Opening

13‧‧‧Working space

14‧‧‧Relief hole

2‧‧‧ mandrel

21‧‧‧Axis

211‧‧‧ Large diameter section

2111‧‧‧ accommodating slots

2112‧‧‧ bottom wall

2113‧‧‧ side wall

2114‧‧‧ first joint

2114a‧‧‧ joint surface

2114b‧‧‧Front

2115‧‧‧Second junction

2115a‧‧‧ joint surface

2115b‧‧‧ curved surface

212‧‧‧Small path

213‧‧‧ housing trough

22‧‧‧Face layer (eg copper layer)

221‧‧‧First hard soldered block

222‧‧‧Second brazed block

3‧‧‧Washers

4‧‧‧O-ring

5‧‧‧Spring Module

51‧‧‧ Positioning block

52‧‧‧ stretching spring

6‧‧‧Pushing seat

7‧‧‧ socket module

71‧‧‧ Nuts

72‧‧‧Dustproof oil seal

73‧‧‧Abrasion belt

74‧‧‧ rubber sleeve

L‧‧‧ center axis

Figure 1 is a perspective view of the hydraulic cylinder of the present invention.

Figure 2 is an exploded perspective view of Figure 1.

3 is an exploded perspective view of another perspective of FIG. 1.

Figure 4 is a cross-sectional view taken along line A-A of Figure 1.

Figure 5 is a perspective cross-sectional view of Figure 1.

Fig. 6 is a partially enlarged schematic view showing a portion C of Fig. 5.

Fig. 7 is a schematic view showing the cylinder block and the spring module omitted in Fig. 5.

Figure 8 is a schematic view of the shaft body of Figure 5.

Please refer to FIG. 1 to FIG. 8 , which is an embodiment of the present invention. It should be noted that the related quantity and appearance mentioned in the embodiment are only used to specifically describe the possible implementation of the present creation. Ways to understand the content, not to limit the scope of the creation.

As shown in FIG. 1 to FIG. 3 , the embodiment is a hydraulic cylinder 100 including a cylinder 1 , a spindle 2 , a washer 3 , an O-ring 4 , a spring module 5 , and a push-on seat 6 . And a set of connection modules 7. Wherein, the washer 3 and the O-ring 4 are mounted on one end of the mandrel 2 (as shown in the bottom end of the mandrel 2 in FIG. 5), and the push-on seat 6 is mounted on the other end of the mandrel 2 (as shown in FIG. 5). The top of the mandrel 2). The mandrel 2 and the spring module 5 are housed in the cylinder block 1 , and the spring module 5 is connected to the mandrel 2 and the cylinder block 1 , and the socket module 7 is substantially disposed between the mandrel 2 and the cylinder block 1 . Hereinafter, the respective components of the above-described hydraulic cylinder 100 will be described separately, and the connection relationship between the components will be described as appropriate.

Referring to FIG. 2, FIG. 3, and FIG. 5, the cylinder block 1 is substantially cylindrical, the cylinder block 1 has an inner wall surface 11, and the inner wall surface 11 surrounds a circular opening 12 and a self-opening hole 12 defined therein. A substantially cylindrical operating space 13 extending inwardly. Further, the cylinder block 1 is provided with a pressure relief hole 14 penetrating from the outer surface to the inner wall surface 11.

The mandrel 2 defines a central axis L, and the mandrel 2 is substantially symmetrical about the central axis L described above. The mandrel 2 is movably received in the operating space 13 of the cylinder block 1 along the central axis L, and the mandrel 2 includes a shaft body 21 and an annular facing layer 22 welded to the shaft body 21. In the embodiment, the cover layer 22 is exemplified by a copper-clad layer 22 (the embodiment is a mandrel-coated copper), and the radius of the facing layer 22 is It is the maximum radius of each part of the mandrel 2, but not limited to this. The mandrel 2 abuts against the inner wall surface 11 of the cylinder 1 only with its facing layer 22 (see Figs. 4 and 5).

The shaft body 21 includes a large diameter section 211 and a small diameter section 212 extending integrally from the large diameter section 211. The radius of the large diameter section 211 is larger than the radius of the small diameter section 212, and the large diameter section 211 corresponds to the central axis. The length of L is smaller than the length of the small diameter section 212 corresponding to the central axis L.

The outer surface of the large diameter section 211 adjacent to the inner wall surface 11 of the cylinder block 1 is recessed to form an annular and equal-depth receiving groove 2111, and the center of the receiving groove 2111 is seated on the central axis L. The accommodating groove 2111 has a bottom wall 2112 and two side walls 2113 connected to the bottom wall 2112 (Fig. 6). The large diameter section 211 is away from the bottom end surface of the small diameter section 212 (the bottom end surface of the large diameter section 211 in FIG. 3 ) and is recessed inwardly along the central axis L direction to the small diameter section 212 to form a receiving groove 213 .

In addition, as shown in FIG. 6 to FIG. 8 , the large diameter section 211 defines a first joint portion 2114 and a second joint portion 2115 . The first joint portion 2114 and the second joint portion 2115 are respectively disposed. The opposite sides of the groove 2111 (such as the upper side and the lower side of the accommodating groove 2111 in FIG. 6), and the first joint portion 2114 is located on the side adjacent to the small diameter section 212. The outer surface of the small diameter section 212 is separated from the inner wall surface 11 of the cylinder block 1 by a gap, and the small diameter section 212 includes an end portion away from the large diameter section 211 (such as the top end portion of the small diameter section 212 in FIG. 5). The end of the small diameter section 212 is located substantially at the opening 12 of the cylinder 1.

The protective layer 22 is welded to the outer surface of the large diameter section 211 of the shaft body 21, and the wear resistance of the facing layer 22 is greater than the wear resistance of the shaft body 21, and the facing layer 22 substantially abuts against the cylinder block. The inner wall surface 11 of 1. That is to say, in the present invention, the mandrel is wrapped with copper, and the shaft body 21 of the mandrel 2 can be made of a material having lower wear resistance and lower strength than the armor layer 22, thereby reducing the overall material cost of the mandrel 2. And when the mandrel 2 is used for a period of time, the worn face layer 22 can be passed through subsequent repairs so that the mandrel 2 can be reused repeatedly, avoiding the waste that the mandrel 2 must be discarded due to wear.

The cover layer 22 is separated into one by the receiving slot 2111 in this embodiment. The first brazing block 221 and the second brazing block 222, the first brazing block 221 and the second brazing block 222 are both annular and each have substantially the same radius, and the first brazing zone The center of each of the block 221 and the second brazing block 222 is seated on the central axis L. Further, the first brazing block 221 and the second brazing block 222 are respectively welded to the first joint portion 2114 and the second joint portion 2115 of the large diameter section 211, and the first brazing block 221 is The end edges of the second brazing block 222 adjacent to each other (such as the bottom end edge of the first brazing block 221 and the top edge of the second brazing block 222 in FIG. 7) and the two side walls 2113 of the receiving groove 2111, respectively They are aligned with each other (ie, in a coplanar setting).

In more detail, the first joint portion 2114 has a joint surface 2114a and a flange 2114b. The joint surface 2114a is an annular outer surface of the first joint portion 2114 adjacent to the inner wall surface 11 of the cylinder block 1. The edge 2114b is formed from the end face of the joint surface 2114a adjacent to the end edge of the small diameter section 212 (such as the top end edge of the joint surface 2114a in FIG. 8) toward the inner wall surface 11 of the cylinder block 1. The first brazing block 221 is welded to the bonding surface 2114a of the first bonding portion 2114, and the first brazing block 221 is away from the one end edge of the receiving groove 2111 (such as the first brazing block in FIG. 7). The 221 tip edge is welded to the flange 2114b (Fig. 8).

Furthermore, the second joint portion 2115 has a joint surface 2115a and a curved surface 2115b connected to the joint surface 2115a. The joint surface 2115a is an annular outer surface of the second joint portion 2115 adjacent to the inner wall surface 11 of the cylinder block 1. The curved surface 2115b is located at a portion of the second joint portion 2115 away from the accommodating groove 2111. The second brazing block 222 is welded to the bonding surface 2115a of the second bonding portion 2115, and the second brazing block 222 is away from the one end edge of the receiving groove 2111 (such as the second brazing block in FIG. 7). The bottom end edge 222 is aligned with the curved surface 2115b of the second joint portion 2115 (Fig. 8).

In addition, the bonding surfaces 2114a and 2115a of the first bonding portion 2114 and the second bonding portion 2115 are exemplified by a smooth surface in the drawing of the embodiment, but the bonding surfaces 2114a and 2115a can also pass through the lifting roughness. So that the first brazing block 221 and the second brazing block 222 can be more firmly bonded thereto.

The gasket 3 and the O-ring 4 are at least partially accommodated in the accommodating groove 2111. In one step, each portion of the gasket 3 and the O-ring 4 protrudes from the receiving groove 2111 to be positioned between the first brazing block 221 and the second brazing block 222, and the outer surface of the gasket 3 not only protrudes The slot 2111 is disposed and substantially aligned with the outer surface of the first braze block 221 . The O-ring 4 is sandwiched between the bottom wall 2112 of the accommodating groove 2111 and the inner wall surface 11 of the cylinder 1.

Referring to FIG. 2, FIG. 3, and FIG. 5, the spring module 5 includes two positioning blocks 51 and a tension spring 52. The two positioning blocks 51 are respectively located at the bottom of the slot 2 of the spindle 2 receiving groove 213 and the cylinder block. In the present embodiment, the two positioning blocks 51 are respectively screwed to the mandrel 2 and the cylinder block 1 in the present embodiment, but the fixing manner is not limited thereto. The tension spring 52 is received in the receiving groove 213 of the mandrel 2, and the opposite ends of the tension spring 52 are respectively fixed to the two positioning blocks 51.

The pushing seat 6 is mounted on the end of the small diameter section 212 of the shaft body 21 by screwing, for example, to push the spindle 2 against the cylinder 1 along the central axis L. Can move together with the mandrel 2.

The socket module 7 is disposed at the opening 12 of the cylinder block 1 and at least partially between the outer surface of the small diameter section 212 and the inner wall surface 11 of the cylinder block 1, and the socket module 7 is substantially free of gaps. The outer surface of the small diameter section 212 and the inner wall surface 11 of the cylinder block 1 are arranged to prevent dust outside the hydraulic cylinder 100 from entering the operating space 13 through the opening 12 of the cylinder block 1, thereby keeping the hydraulic cylinder 100 running smoothly. Sex.

In more detail, the socket module 7 is exemplified by a plurality of components in the embodiment. As shown in FIG. 2 and FIG. 5, the socket module 7 includes a nut 71 and a dust seal 72. , a hard wearing belt 73, and a rubber sleeve 74. The dust seal 72, the wear band 73, and the rubber sleeve 74 are substantially annular, and the dust seal 72 is fixed to the inner edge of the nut 71 at intervals from the wear band 73. Furthermore, the nut 71 provided with the dustproof oil seal 72 and the wear band 73 is located between the outer surface of the small diameter section 212 and the inner wall surface 11 of the cylinder 1, and the nut 71, the dust seal 72, and the wear band 73 The inner edge abuts substantially on the outer surface of the small diameter section 212 without a gap, and the outer edge of the nut 71 abuts against the inner wall surface 11 of the cylinder 1 with substantially no gap. The rubber sleeve 74 is sleeved on the top of the cylinder block 1 The outer surface abuts against a portion of the top edge of the nut 71.

[Possible effects of this creative embodiment]

In summary, in the hydraulic cylinder provided by the present embodiment, the mandrel is formed by welding a protective layer (copper layer) to a large diameter section of the shaft body, thereby comparing the shaft body of the mandrel. For the facing layer, a material with low wear resistance and low strength can be selected to reduce the overall material cost of the mandrel. And when the mandrel is used for a period of time, the worn protective layer can pass through subsequent repairs so that the mandrel can be reused repeatedly, avoiding the waste that the mandrel must be discarded due to wear.

The above is only a preferred embodiment of the present invention, and it is not intended to limit the scope of the patents of the present invention. Any changes and modifications made to the scope of the patent application of the present invention should be covered by the present invention.

1‧‧‧Cylinder

11‧‧‧ inner wall

21‧‧‧Axis

211‧‧‧ Large diameter section

2111‧‧‧ accommodating slots

2112‧‧‧ bottom wall

2113‧‧‧ side wall

2114‧‧‧ first joint

2115‧‧‧Second junction

212‧‧‧Small path

22‧‧‧Face layer (eg copper layer)

221‧‧‧First hard soldered block

222‧‧‧Second brazed block

3‧‧‧Washers

4‧‧‧O-ring

5‧‧‧Spring Module

52‧‧‧ stretching spring

Claims (10)

A hydraulic cylinder includes: a cylinder having an inner wall surface, and the inner wall surface enclosing an operating space defining an opening and extending inwardly from the opening; a mandrel defining a central axis, the mandrel The axis is movably received in the working space of the cylinder, and the mandrel comprises: a shaft body including a large diameter section and a small diameter section integrally extending from the large diameter section, the small The outer surface of the radial section is separated from the inner wall surface of the cylinder by a gap, and the small diameter section includes an end portion away from the large diameter section, the end of the small diameter section is located at an opening of the cylinder; The surface layer is welded to the outer surface of the large diameter section of the shaft body, the wear resistance of the surface layer is greater than the wear resistance of the shaft body, and the surface layer substantially abuts against the inner wall surface of the cylinder body; a push-on seat, installed at the end of the small-diameter section; and a set of connecting modules mounted at the opening of the cylinder and at least partially located on the outer surface of the small-diameter section and the inner wall surface of the cylinder And the sleeve module abuts the outer surface of the small diameter section and the inner wall surface of the cylinder substantially without a gap. The hydraulic cylinder of claim 1, wherein the outer surface of the large diameter section of the shaft body is recessed to form an annular receiving groove, and the center of the receiving groove is seated on the central axis, and the receiving The groove has a bottom wall and two side walls connected to the bottom wall; the hydraulic cylinder further includes an O-ring, the O-ring is at least partially received in the receiving groove, and the O-ring is clamped thereto The bottom wall of the receiving groove and the inner wall surface of the cylinder. The hydraulic cylinder of claim 2, wherein the facing layer is separated into a first brazing block and a second brazing block by the receiving groove, the first brazing block and the second The brazing blocks are annular and the respective centers are located on the central axis, and the end edges of the first brazing block and the second brazing block adjacent to each other and the side walls of the receiving groove respectively They are in line with each other. The hydraulic cylinder of claim 3, wherein the large diameter section defines a first joint portion and a second joint portion, wherein the first joint portion and the second joint portion are respectively located opposite to the accommodating groove a first bonding portion and a second bonding portion are respectively soldered to the first bonding portion and the second bonding portion, and the first bonding portion is adjacent to the first bonding portion, and the second bonding portion is respectively soldered to the first bonding portion and the second bonding portion. The O-ring portion protrudes from the receiving groove and is located between the first brazing block and the second brazing block. The hydraulic cylinder of claim 4, wherein the first joint portion has a joint surface and a flange, and the flange extends outwardly from the joint edge adjacent to the end edge of the small diameter portion, the first The soldered portion is soldered to the bonding surface of the first bonding portion, and the first soldering portion is soldered to the flange from an edge of the receiving groove. The hydraulic cylinder of claim 5, wherein the second joint portion has a joint surface and a curved surface connected to the joint surface, the arc surface being located at a portion of the second joint portion away from the accommodating groove The second soldered portion is soldered to the bonding surface of the second bonding portion, and an edge of the second soldering portion away from the receiving groove is aligned with the curved surface of the second bonding portion. The hydraulic cylinder of any one of the preceding claims, wherein the protective layer is further defined as a copper-clad layer, and the mandrel is only abutted against the cylinder by a copper-clad layer thereof. Inner wall surface. A mandrel of a hydraulic cylinder defines a central axis, and the mandrel of the hydraulic cylinder includes: a shaft body including a large diameter section and a small diameter section integrally extending from the large diameter section; and a copper coating layer, Soldering on an outer surface of the large diameter section of the shaft body, the copper clad layer is an annular structure centered on the central axis, and a radius of the copper clad layer is a maximum radius of each part of the mandrel, The wear resistance of the copper-clad layer is greater than the wear resistance of the shaft body. The mandrel of the hydraulic cylinder of claim 8, wherein the outer surface of the large diameter section of the shaft body is recessed to form an annular receiving groove, and the center of the receiving groove is located at the The central axis, the copper clad layer is divided by the accommodating groove into a first brazing block and a second brazing block. The mandrel of the hydraulic cylinder of claim 9, wherein the accommodating groove has a bottom wall and two side walls connected to the bottom wall, and the first brazing block and the second brazing block are both The ends of the first brazing block and the second brazing block are adjacent to each other, and the end edges of the first brazing block and the second brazing block are respectively aligned with the sidewalls of the receiving groove.