WO2019195980A1

WO2019195980A1 - Push rod/piston assembly for hydraulic master cylinder of clutch disengagement system, and assembling method for push rod/piston assembly

Info

Publication number: WO2019195980A1
Application number: PCT/CN2018/082321
Authority: WO
Inventors: 吴沛衡
Original assignee: 舍弗勒技术股份两合公司; 吴沛衡
Priority date: 2018-04-09
Filing date: 2018-04-09
Publication date: 2019-10-17
Also published as: CN111699328A; CN111699328B

Abstract

A push rod/piston assembly for a hydraulic master cylinder of a clutch disengagement system, and an assembling method for the push rod/piston assembly. The push rod/piston assembly comprises: a push rod (1), one side end of the push rod (1) in the axial direction being formed to be a spherical portion (12); a piston (2), comprising a columnar piston body (21) and multiple elastic plates (22) extending out from the other side end, in the axial direction, of the piston body (21), the multiple elastic plates (22) extending along the axial direction and being distributed at intervals in the circumferential direction, so as to form a mounting space (SO) defined by the multiple elastic plates (22) and the other side end, in the axial direction, of the piston body (21), with the spherical portion mounted in the mounting space (SO); and a securing ring (3), at least one portion thereof being sleeved on the multiple elastic plates (22), so that the inner surfaces of the multiple elastic plates (22) are abutted against the spherical portion (12) in the state that the spherical portion (12) is mounted in the mounting space (SO). The push rod/piston assembly is less in assembling steps, easy in assembly, and low in assembling costs; on the other hand, the risk of damages to components of the push rod/piston assembly during assembling is further avoided.

Description

Push rod/piston assembly for hydraulic master cylinder for clutch separation system and assembly method thereof

Technical field

The present invention relates to a clutch release system, and more particularly to a push rod/piston assembly for a hydraulic master cylinder of a clutch release system and a method of assembling same.

Background technique

As shown in FIG. 1a, in the prior art, the push rod/piston assembly of the hydraulic master cylinder for the clutch release system includes a push rod 10, a piston 20, and a jaw disk 30 that are assembled to each other.

Specifically, as shown in FIGS. 1a and 1b, the push rod 10 includes a pusher main body 101, and an axial side end (left end in FIG. 1a) of the pusher main body 101 is formed with a spherical portion 102, and the spherical portion 102 is formed. The claw shaft 30 is assembled with the piston 20, and the other axial end (the right end in Fig. 1a) of the pusher main body 101 is formed with a connecting portion 103 connected to other members.

As shown in Figures 1a and 1c, the piston 20 has a cylindrical shape. The inside of the piston 20 forms a first installation space S1 including a small diameter portion S11 and a large diameter portion S12 that communicate with each other, the small diameter portion S11 coincides with the central axis of the large diameter portion S12, and the small diameter portion S11 is in the radial direction. The size on R is smaller than the dimension of the large diameter portion S12 in the radial direction R. The other axial end of the piston 20 is formed with an opening such that the large diameter portion S12 communicates with the outside of the piston 20 through the opening.

As shown in FIGS. 1a and 1d, the claw disk 30 includes a claw disk base 301 and a plurality of elastic claws 302 and mounting posts 303 projecting from the claw disk base 301 toward the axial sides, respectively.

The jaw disk base 301 has a disk shape, and the dimension of the jaw disk base 301 in the radial direction R is smaller than the radial dimension of the large diameter portion S12.

A plurality of elastic claws 302 extend from the jaw disk base 301 toward the other side in the axial direction, and the plurality of elastic claws 302 are evenly distributed in the circumferential direction and the circumferential dimensions of the adjacent two elastic claws 302 are equal. The plurality of elastic claws 302 and the claw disk base 301 form a second installation space S2 for mounting the spherical portion 102 of the push rod 10.

The mounting post 303 extends from the jaw disk base 301 toward the axial side and is formed with a plurality of annular projections that protrude outward in the radial direction.

When it is necessary to assemble the push rod 10, the piston 20, and the jaw disk 30 having the above structure to constitute the push rod/piston assembly, first, as shown in Fig. 1e, the spherical portion 102 of the push rod 10 is pressed into the claw. The second mounting space S2 of the disk 30 is in an interference fit with the plurality of elastic claws 302; then, as shown in FIG. 1f, the claws are placed in a state where the spherical portion 102 has been pressed into the claw disk 30. The disk 30 is mounted to the first mounting space S1 of the piston 20 such that the mounting post 303 of the claw disk 30 is inserted into the small diameter portion S11 of the first mounting space S1 and the plurality of elastic claws 302 and the spherical portion 102 are inserted into the large diameter portion S12, which The plurality of annular projections of the mounting main 303 are interference-fitted with the wall of the piston 20 for forming the small diameter portion S11 and the plurality of elastic claws 302 are interference-fitted with the wall of the piston 20 for forming the large diameter portion S12; Forming a push rod/piston assembly as shown in Figure 1a.

The inventors of the present application have found that the prior art pusher/piston assembly described above has the following drawbacks:

1. The prior art push rod/piston assembly requires a two-step insertion/interference fit step assembly as described above, so the assembly process is cumbersome and the assembly cost is high;

2. When the spherical portion 102 of the push rod 10 is assembled to the second installation space S2 of the jaw disk 30, a centering operation is required, so an assembly tool is required;

3. The plurality of elastic claws 302 of the jaw disk 30 and the spherical portion 102 of the push rod 10 require an interference fit, so that the portion of the elastic claw 302 in the region M1 in FIG. 1e is liable to be damaged during assembly;

4. When both the jaw disk 30 and the push rod 10 are assembled to the first installation space S1 of the piston 20, the centering work is also required and the required assembly force is large, so that an assembly tool is required;

5. The jaw disk 30 is interference-fitted with the wall of the piston 20 for forming the large diameter portion S12, so that the portion of the piston 20 and the jaw disk 30 in the region M2 in Fig. 1f is easily damaged during assembly. .

Summary of the invention

The present invention has been made based on the above-described drawbacks of the prior art. It is an object of the present invention to provide a new push rod/piston assembly for a hydraulic master cylinder for a clutch release system that is easy to assemble and low in assembly cost, and also avoids the introduction of a push rod during assembly The components in the / piston assembly are at risk of breakage. Another object of the present invention is to provide a method of assembling the above-described push rod/piston assembly.

To this end, the present invention adopts the following technical solutions.

The present invention provides a push rod/piston assembly for a hydraulic master cylinder for a clutch release system having axial, radial and circumferential directions and the push rod/piston assembly comprising: a push rod, the axial one end of the push rod is formed as a spherical portion; the piston includes a cylindrical piston body and a plurality of elastic plates projecting from the other axial end of the piston body, The plurality of elastic plates extend in the axial direction and are spaced apart from each other in the circumferential direction such that an installation space surrounded by the plurality of elastic plates and the other axial side end of the piston body is formed and the spherical portion is formed Mounted in the installation space; and a fastening ring, at least a portion of the fastening ring is sheathed to the plurality of elastic plates such that the plurality of the ball portions are mounted in the installation space The inner surface of the elastic plate is pressed against the spherical portion.

Preferably, each of the elastic plates includes a root portion connected to the piston body, and each of the elastic plates is bendable radially outward about the respective root portions.

Preferably, each of the elastic plates has an arc shape extending in a circumferential direction, and circumferential intervals between adjacent ones of the elastic plates are equal, so that the plurality of elastic plates are evenly distributed in the circumferential direction.

More preferably, the inner surface of each of the elastic plates including a portion of the root portion is formed with an elastic plate recess having a shape corresponding to a shape of a portion of the spherical portion.

More preferably, an end surface of the other axial end portion of the piston main body forms a piston main body recess having a shape corresponding to a shape of a portion of the spherical portion such that the elastic plate concave portion and the piston main body concave portion are formed The continuous concave portion corresponding to the shape of the spherical portion is formed by the continuous concave portion.

Preferably, an outer surface of the plurality of elastic plates is formed with an external thread of an elastic plate, and an inner surface of the fastening ring is formed with an internal thread corresponding to the external thread of the elastic plate, through the internal thread and the elasticity The engagement of the external threads allows the fastening ring to be jacketed to the plurality of resilient plates.

More preferably, an outer surface of a portion of the piston body that is coupled to the plurality of elastic plates is formed with an external thread of a piston body that is continuous with an external thread of the elastic plate, and the external thread of the piston body is through the internal thread The engagement causes a portion of the fastening ring to be jacketed to the piston body.

Preferably, the fastening ring is formed with at least one anti-rotation protrusion extending from one axial end surface thereof, the at least one anti-rotation protrusion extends in the axial direction, and the piston body is formed to face the circumference a groove that is open to one side and that cooperates with the anti-rotation protrusion.

Preferably, the plurality of elastic plates are formed integrally with the piston body.

The present invention also provides a method of assembling a push rod/piston assembly which is a push rod of a hydraulic master cylinder for a clutch disengagement system according to any one of the above technical solutions. a piston assembly, the assembly method comprising: pressing a spherical portion of the push rod from an axially opposite side into an installation space of the piston, and then jacketing the fastening ring from the other side of the axial direction a plurality of elastic plates such that the plurality of elastic plates are pressed against the spherical portion.

By adopting the above technical solution, the present invention provides a novel push rod/piston assembly for a hydraulic master cylinder for a clutch disengagement system, and a method of assembling the same, the ball portion of the push rod of the push rod/piston assembly is directly mounted to The mounting space surrounded by the elastic plates of the piston and the fastening ring ensure that the elastic plate is pressed against the spherical portion. Thus, compared to the prior art push rod/piston assembly, on the one hand, the push rod/piston assembly of the present invention requires only one insertion step, so the assembly steps are small, easy to assemble, and the assembly cost is low; The assembly of the push rod/piston assembly of the present invention does not require an interference fit, so no centering work is required and only a small assembly force is required, which further reduces assembly costs and also avoids push rods/pistons during assembly. Each component in the assembly is at risk of breakage.

DRAWINGS

1a is an axial cross-sectional view of a prior art push rod/piston assembly for a hydraulic master cylinder of a clutch release system; FIG. 1b is a perspective view of the push rod of the push rod/piston assembly of FIG. 1a; FIG. Is a perspective view of the piston of the push rod/piston assembly of Figure 1a; Figure 1d is a perspective view of the jaw disk of the push rod/piston assembly of Figure 1a; Figure 1e is the card of the push rod/piston assembly of Figure 1a A schematic partial axial cross-sectional view of a state in which the jaw disk and the push rod are assembled; FIG. 1f is a partial view of the jaw plate and the push rod of the push rod/piston assembly of FIG. 1a assembled with the piston Schematic diagram of axial section.

Figure 2a is a front elevational view of a push rod/piston assembly for a hydraulic master cylinder of a clutch release system in accordance with the present invention; Figure 2b is an axial cross-sectional view of the push rod/piston assembly of Figure 2a; Figure 2c is a view 2D is a perspective view of the push rod of the push rod/piston assembly of FIG. 2a; FIG. 2d is a perspective view of the piston of the push rod/piston assembly of FIG. 2a; FIG. 2e is the view of the piston of FIG. 2d viewed from the other side of the axial direction Figure 2f is a perspective view of the fastening ring of the push rod/piston assembly of Figure 2a; Figure 2g is a partial enlarged view of the fastening ring of Figure 2f; Figure 2h is the push rod / piston of Figure 2b A schematic partial axial cross-sectional view of the assembly of the push rod, piston and fastening ring assembled together.

Description of the reference numerals

10 push rod 101 push rod main body 102 ball portion 103 connecting portion 20 piston S1 first mounting space S11 small diameter portion S12 large diameter portion 30 claw disc 301 claw disc base 302 elastic claw 303 mounting post S2 second mounting space

1 push rod 11 push rod main body 12 ball portion 13 connecting portion 2 piston 21 piston main body 211 piston main body recessed portion 212 recess 22 elastic plate 221 elastic plate concave portion S0 mounting space 3 fastening ring 31 fastening ring main body 32 anti-rotation projection

A-axis R radial C circumferential

detailed description

Preferred technical solutions of the present invention will be described below with reference to the accompanying drawings. Unless otherwise specified, the axial, radial and circumferential directions of the present invention refer to the axial, radial and circumferential directions of the push rod/piston assembly of the hydraulic master cylinder for the clutch release system according to the present invention, respectively. The axial side "refers to the left side in FIGS. 2a, 2b, and 2h, and the "axial side" refers to the right side in FIGS. 2a, 2b, and 2h.

(Structure of the push rod/piston assembly)

In the present embodiment, as shown in FIGS. 2a, 2b, and 2h, the push rod/piston assembly of the hydraulic master cylinder for the clutch disengagement system according to the present invention includes the push rod 1, the piston 2, and the components assembled with each other. Fastening ring 3.

Specifically, as shown in FIGS. 2a, 2b, and 2c, the push rod 1 includes a pusher main body 11, and an axial side end (left end in FIG. 2b) of the push rod main body 11 is formed with a spherical portion 12, which The spherical portion 12 is for attachment to the piston 2, and the other axial end (the right end in Fig. 2b) of the pusher main body 11 is formed with a connecting portion 13 connected to other members.

As shown in Figs. 2a, 2b, 2d and 2e, the piston 2 includes a cylindrical piston main body 21 and four elastic plates 22 projecting from the other axial end of the piston main body 21.

Each of the elastic plates 22 has an arc shape extending a predetermined length along the circumferential direction C and each of the elastic plates 22 extends along the axial direction A. Further, the intervals between the adjacent elastic plates 22 in the circumferential direction C are equal, so that the plurality of elastic plates 22 are evenly distributed in the circumferential direction C. Thus, the installation space S0 surrounded by the four elastic plates 22 and the other axial end of the piston main body 21 is formed, and the spherical portion 12 of the push rod 1 is mounted in the installation space S0.

Each of the elastic plates 22 includes a root portion connected to the piston main body 21, and an inner surface of a portion of each of the elastic plates 22 including the root portion forms an elastic plate concave portion 221 corresponding to a shape of a portion of the spherical portion 12, and the other side of the piston main body 21 in the axial direction The end surface of the end portion forms a piston main body recess 211 corresponding to the shape of a part of the spherical portion 12. The elastic plate concave portion 221 integrally forms a continuous concave portion corresponding to the shape of the spherical portion 12 with the piston main body concave portion 211, and the installation space S0 is surrounded by the continuous concave portion. Thus, after the spherical portion 12 of the push rod 1 is mounted in the installation space S0, the spherical portion 12 matches the continuous concave portion.

In order to make the spherical portion 12 closely fit with the continuous concave portion, in the present embodiment, the fastening ring 3 is fitted to the plurality of elastic plates 22 from the radially outer side of the plurality of elastic plates 22, and the outer surfaces of the plurality of elastic plates 22 are formed to be useful. The external thread of the elastic plate of the fastening ring 3 is installed.

In order to facilitate the pressing of the spherical portion 12 of the push rod 1 from the other side in the axial direction into the installation space S0, the respective elastic plates 22 can be bent radially outward around the respective root portions. Thus, the opening defined by each of the elastic plates 22 away from the free end of the piston main body 21 is enlarged toward the radially outer side to allow the spherical portion 12 of the push rod 1 to be installed into the installation space S0 via the opening.

Further, a portion of the piston main body 21 located radially outward of the elastic plate 22 is formed with two recesses 212 that open toward one side in the circumferential direction, and the two recessed projections of the two recesses 212 and the fastening ring 3 described below The 32 fits such that the two anti-rotation projections 32 of the fastening ring 3 snap into the two recesses 212 of the piston body 21, respectively, when the fastening ring 3 is rotated into position. In this way, the risk of the fastening ring 3 accidentally falling off the elastic plate 22 due to vibration is avoided.

In the present embodiment, the plurality of elastic plates 22 are integrally formed with the piston main body 21.

As shown in FIGS. 2a, 2b, 2f, and 2g, the fastening ring 3 is sheathed to the plurality of elastic plates 22 such that the inner surface of the plurality of elastic plates 22 is pressed in a state where the spherical portion 12 is mounted in the installation space S0. Abuts the spherical portion 12. Specifically, the fastening ring 3 includes a cylindrical fastening ring main body 31 and two anti-rotation projections 32 projecting from one axial end surface of the fastening ring main body 31, and the two anti-rotation projections 32 are both Extending along the axial direction and spaced apart by a predetermined distance in the circumferential direction C. The shape of each anti-rotation protrusion 32 is matched with the shape of each groove 212 of the piston main body 21, so that each anti-rotation protrusion 32 can be caught in the groove 212 after the fastening ring 3 is rotated into position to avoid fastening The risk of accidental shedding of ring 3.

The inner surface of the fastening ring main body 31 is formed with an internal thread corresponding to the external thread of the elastic plate, and the engagement of the internal thread with the external thread of the elastic plate causes the fastening ring 3 to be tightly fitted to the plurality of elastic plates 22. An outer surface of a portion of the piston main body 21 that is connected to the four elastic plates 22 is formed with a male main thread that is continuous with the external thread of the elastic plate. If necessary, a part of the fastening ring 3 may be fitted over the portion of the piston body 21 provided with the external thread of the piston body.

The structure of the push rod/piston assembly for the hydraulic master cylinder for the clutch release system according to the present invention has been described above, and the assembly method of the push rod/piston assembly will be described below.

(Assembling method of push rod/piston assembly)

As shown in Figures 2a, 2b and 2h, first, the fastening ring 3 is placed on the push rod 1 from the axial side and the fastening ring 3 is located on the other axial side of the spherical portion 12 of the push rod 1. s position;

Subsequently, the spherical portion 12 of the push rod 1 is pressed into the installation space S0 of the piston 2 from the other side in the axial direction, but the spherical portion 12 and the piston 2 (the piston main body 21 and the elastic plate 22) do not have an interference fit relationship. During the pressing process, the opening formed by the free ends of the plurality of elastic plates 302 is first enlarged to allow the push rod 1 to protrude into the installation space S0, and then the opening is substantially restored to its original shape;

Finally, the fastening ring 3 is screwed from the other side of the axial direction to the radially outer side of the plurality of elastic plates 22 such that a part of the fastening ring 3 is sheathed to the plurality of elastic plates 22 and the other portion is formed with the piston body 21 formed. The portion of the external thread of the piston body ensures that the plurality of elastic plates 22 are pressed against the spherical portion 12 and the anti-rotation projection 32 of the fastening ring 3 is snapped into the recess 212 of the piston body 21. Further, it should be noted that the opening size of the free end portions of the four elastic plates 22 should be smaller than the diameter of the spherical portion 12 to prevent the spherical portion 12 from accidentally coming out of the installation space S0.

Thus, compared to the prior art push rod/piston assembly assembly method of FIG. 1a, on the one hand, the assembly method of the push rod/piston assembly according to the present invention is completed by only one insertion operation, making the assembly step simpler. The assembly cost is lower; on the other hand, since there is no interference fit relationship during the assembly process, only a small assembly force is required in the assembly process and no centering operation is required, which further reduces the assembly cost and avoids pushing. The various components of the rod/piston assembly create the risk of breakage as in the prior art.

In addition, on the one hand, since the push rod/piston assembly according to the present invention does not have an interference fit relationship, the thickness of the elastic plate 22 in the radial direction R can be large, preventing accidental breakage of the elastic plate 22; The thickness of the joint portion between the spherical portion 12 of the push rod 1 and the piston 2 is also increased by the fastening ring 3, so that accidental breakage at the joint portion is further prevented.

Although the above specific embodiments have explained the technical solutions of the present invention in detail, it is also necessary to explain that:

1. Although the four elastic plates 22 are uniformly distributed in the circumferential direction C in the above detailed description, the present invention is not limited thereto. The number of the elastic plates 22 is not limited to the four described in the above embodiment, and the elastic plates 22 may be unevenly distributed in the circumferential direction C.

2. Although the number of the anti-rotation protrusions 32 is described in the above specific embodiment, the present invention is not limited thereto. The number of the anti-rotation projections 32 can be set as needed.

Claims

A push rod/piston assembly for a hydraulic master cylinder of a clutch release system, the push rod/piston assembly having an axial, radial and circumferential direction and the push rod/piston assembly comprising:

a push rod, the axial side end of the push rod is formed as a spherical portion;

a piston including a cylindrical piston body and a plurality of elastic plates projecting from the other axial end of the piston body, the plurality of elastic plates extending along the axial direction and spaced apart from each other in the circumferential direction Forming an installation space surrounded by the plurality of elastic plates and the other axial side end of the piston body and the spherical portion is mounted in the installation space;

a fastening ring, at least a portion of the fastening ring is sheathed to the plurality of elastic plates such that an inner surface of the plurality of elastic plates is pressed against the state in which the spherical portion is mounted in the installation space Said globular part.
A push rod/piston assembly for a hydraulic master cylinder of a clutch release system according to claim 1 wherein

Each of the elastic plates includes a root portion connected to the piston body, and each of the elastic plates is bendable radially outward about the respective root portions.
A push rod/piston assembly for a hydraulic master cylinder of a clutch release system according to claim 1 or 2, wherein

Each of the elastic plates has an arc shape extending in a circumferential direction, and circumferential intervals between adjacent ones of the elastic plates are equal, so that the plurality of elastic plates are evenly distributed in the circumferential direction.
A push rod/piston assembly for a hydraulic master cylinder of a clutch disengagement system according to claim 2, wherein an inner surface of each of said elastic plates including a portion of said root portion is formed into a shape and said spherical portion The shape of a portion corresponds to the recess of the elastic plate.
A push rod/piston assembly for a hydraulic master cylinder of a clutch disengagement system according to claim 4, wherein an end surface of the other axial end portion of the piston main body forms a shape and a part of the spherical portion The piston body recess corresponding to the shape is such that the elastic plate recess and the piston body recess form a continuous recess corresponding to the shape of the spherical portion, and the mounting space is formed by the continuous recess.
The push rod/piston assembly for a hydraulic master cylinder for a clutch disengagement system according to any one of claims 1 to 5, wherein an outer surface of the plurality of elastic plates is formed with an external thread of an elastic plate, The inner surface of the fastening ring is formed with an internal thread corresponding to the external thread of the elastic plate, and the engagement of the internal thread with the external thread of the elastic plate causes the fastening ring to be sheathed to the plurality of elastic plates.
A push rod/piston assembly for a hydraulic master cylinder of a clutch disengagement system according to claim 6, wherein an outer surface of a portion of said piston body that is coupled to said plurality of elastic plates is formed with said An external thread of the piston body that is externally threaded by the elastic plate, and a portion of the fastening ring is fitted to the piston body by engagement of the internal thread with the external thread of the piston body.
A push rod/piston assembly for a hydraulic master cylinder of a clutch release system according to any one of claims 1 to 7, wherein

The fastening ring is formed with at least one anti-rotation protrusion projecting from one axial end surface thereof, the at least one anti-rotation protrusion extending in the axial direction, and

The piston body is formed with a groove that is open toward the circumferential side and that cooperates with the anti-rotation protrusion.
A push rod/piston assembly for a hydraulic master cylinder for a clutch release system according to any one of claims 1 to 8, wherein the plurality of elastic plates are formed integrally with the piston body.
A method of assembling a push rod/piston assembly, characterized in that the push rod/piston assembly is a push rod/piston assembly for a hydraulic master cylinder of a clutch disengagement system according to any one of claims 1 to 9. The assembly method includes:

Pressing the spherical portion of the push rod into the installation space of the piston from the other side of the axial direction, and then fastening the fastening ring to the plurality of elastic plates from the other side of the axial direction, so that the plurality of The elastic plate is pressed against the spherical portion.