WO2018014680A1

WO2018014680A1 - Clutch disengagement system and clutch slave cylinder

Info

Publication number: WO2018014680A1
Application number: PCT/CN2017/088235
Authority: WO
Inventors: 张斌; 亨利克基洛托马法拉奇奥尔多; 路易斯维埃拉法比奥
Original assignee: 舍弗勒技术股份两合公司; 张斌; 亨利克基洛托马法拉奇奥尔多; 路易斯维埃拉法比奥
Priority date: 2016-07-20
Filing date: 2017-06-14
Publication date: 2018-01-25
Also published as: DE112017003639T5; CN107642560A

Abstract

A clutch disengagement system and a clutch slave cylinder. The clutch slave cylinder (1) comprises: a cylinder (2), a piston (3), and a stopper (4) disposed at the cylinder (2). The cylinder (2) is provided with a ring-shaped pressure cavity (2a). The pressure cavity (2a) surrounds a central axis of the cylinder (2). The piston (3) is used inside the pressure cavity (2a) to move back and forth along an axial direction of the cylinder (2). The stopper (4) is disposed at an axially-distal side of the piston (3) away from the interior of the pressure cavity (2a) and is used to stop the piston (3) from falling off the cylinder (2). The stopper (4) is disposed at an external circumferential surface (20) of the cylinder (2). Owing to the technical solution provided by the present invention, the stopper (4) is disposed at the external circumferential surface (20) of the cylinder (2) and does not intersect with an internal circumferential surface (21) of the cylinder (2), avoiding the need to modify the internal circumferential surface (21). After the cylinder (2) is molded, a mold release process of the internal circumferential surface (21) can be easily completed. A mold for manufacturing the cylinder (2) of the clutch slave cylinder (1) has a simple design, is more feasible, and has reduced production costs. In addition, the larger space outside the cylinder (2) can provide more room for maneuver during assembly of the stopper (4) and the external circumferential surface (20) of the cylinder, thereby improving ease of assembly and lowering installation costs.

Description

Clutch release system and clutch slave cylinder

The present application claims priority to Chinese Patent Application No. 201610576686.8, entitled "Clutch Separation System and Clutch Cylinder", filed on July 20, 2016, the entire contents of which is incorporated herein by reference. in.

Technical field

The present invention relates to the field of clutch technology, and in particular to a clutch release system and a clutch slave cylinder.

Background technique

Existing clutch release systems include a clutch slave cylinder for controlling clutch disengagement and engagement. The clutch slave cylinder includes a cylinder body, a piston sleeved outside the cylinder body, and a stop ring disposed on the cylinder block. The cylinder body is provided with an annular pressure chamber surrounding the central axis of the cylinder, and the piston is used for reciprocating movement in the axial direction of the cylinder within the pressure chamber. The stop ring is located on a side of the piston axially away from the pressure chamber and overlaps the piston at least in a radial portion for blocking the piston from falling off the cylinder.

Wherein, the stop ring and the cylinder are installed in such a manner that the cylinder has a hollow cavity, and the radially inner end of the stop ring is axially pressed into the hollow cavity, and the radially inner end of the stop ring is pressed into the hollow cavity. And fits on the inner wall of the cylinder. This type of installation requires special installation equipment, the stamping process is not easy to control, and the installation cost is high.

In order to fix the stop ring, a press-fit groove is provided on the inner peripheral surface of the cylinder, and the radially inner end of the stop ring is pressed into the press-fit groove. When the cylinder of the clutch slave cylinder is manufactured by the mold forming process, since it is necessary to form a press-fit groove on the inner peripheral surface of the cylinder, it is difficult to achieve demolding after the mold is formed. In order to demold the inner peripheral surface of the press-fit groove, a complicated design of the mold for manufacturing the cylinder of the clutch slave cylinder is required, resulting in high manufacturing cost.

Summary of the invention

The problem solved by the present invention is that in the existing clutch slave cylinder, the stop ring and the clutch are The installation cost of the cylinder block is relatively high, resulting in a high manufacturing cost of the clutch slave cylinder.

In order to solve the above problems, the present invention provides a clutch slave cylinder including: a cylinder, a piston, and a stopper provided on the cylinder; the cylinder is provided with an annular pressure chamber, and the pressure chamber surrounds a central axis of the cylinder, the piston for reciprocating in an axial direction of the cylinder within the pressure chamber; the stopper being located axially away from the pressure chamber One side for blocking the piston from falling off the cylinder; the stopper is mounted on an outer circumferential surface of the cylinder.

Optionally, the stopper is raised outward in the radial direction of the cylinder from the inner circumferential surface of the piston.

Optionally, the clutch slave cylinder is a clutch centering sub-cylinder.

Optionally, an outer circumferential surface of the cylinder body is formed with a receiving groove, and the stopper is defined in the receiving groove and protrudes outside the receiving groove in a radial direction of the cylinder.

Optionally, the inner diameter of the cylinder has consistency along the axial direction of the cylinder.

Optionally, the cylinder body includes: a first portion and a second portion that are axially connected; the second portion is away from the pressure chamber than the first portion, and an outer diameter of the second portion is smaller than the first portion The outer diameter of the receiving groove is formed on an outer peripheral surface of the second portion.

Optionally, the receiving groove is cut to the first portion along an axial direction of the cylinder.

Optionally, the stop is annular and surrounds the cylinder.

Optionally, the stop has a notch in the circumferential direction.

Optionally, the stop is a C-ring.

The present invention also provides a clutch release system comprising the clutch slave cylinder of any of the above.

Compared with the prior art, the technical solution of the present invention has the following advantages:

The stopper is installed on the outer peripheral surface of the cylinder body, and does not intersect with the circumferential surface of the cylinder body, and the inner circumferential surface does not need to be improved. After the mold is formed, the demolding process of the cylinder body from the inner circumferential surface is easily completed. The mold for manufacturing the clutch slave cylinder is simple in design, easy to implement, and low in manufacturing cost. Moreover, the space outside the cylinder is large, which can provide a large operation space for the assembly process of the stopper and the outer peripheral surface of the cylinder, improve assembly convenience, and reduce installation cost.

DRAWINGS

Figure 1 is a cross-sectional view of a clutch slave cylinder in accordance with an embodiment of the present invention;

Figure 2 is an exploded view of a clutch slave cylinder in accordance with an embodiment of the present invention.

detailed description

The above described objects, features, and advantages of the present invention will be more apparent from the aspects of the invention.

The clutch release system includes a clutch slave cylinder. Referring to FIGS. 1 and 2, the clutch slave cylinder 1 includes a cylinder block 2, a piston 3, and a stopper 4 provided on the cylinder block 2. The cylinder block 2 is provided with an annular pressure chamber 2a around the central axis of the cylinder block 2, the piston 3 is for reciprocating movement in the axial direction of the cylinder block 2 in the pressure chamber 2a; the stopper 4 is located along the axis of the piston 3 The side away from the inside of the pressure chamber 2a serves to block the piston 3 from coming off the cylinder 2. When the pressure chamber 2a is filled with oil, the piston 3 moves toward the stopper 4, and the stopper 4 can block the piston 3 from being pulled out from the cylinder 2 in the axial direction.

Among them, the stopper 4 is attached to the outer peripheral surface 20 of the cylinder 2. This can bring the following advantages:

The stopper 4 does not intersect with the inner circumferential surface 21 of the cylinder 2, and it is not necessary to improve the inner circumferential surface 21. After the molding of the mold, the demolding process of the cylinder 2 from the inner circumferential surface 21 is easily completed, and the clutch is used for manufacturing. The mold of the cylinder 2 of the slave cylinder 1 is simple in design, easy to implement, and low in manufacturing cost. Moreover, the space outside the cylinder 2 is large. This can provide a large operation space for the assembly process of the stopper 4 and the outer peripheral surface 20 of the cylinder 2, improving assembly convenience and reducing installation cost.

The stopper 4 is raised outward in the radial direction of the cylinder 2 from the inner peripheral surface 30 of the piston 3. In the piston 3 When the stopper 4 is resisted, the corresponding end surface of the piston 3 and the stopper 4 have a sufficient stop area in the axial direction, which can more effectively improve the stopping effect of the stopper 4 and prevent the piston 3 from falling out.

The clutch slave cylinder 1 may be a clutch centering type secondary cylinder. The tubular body 10 is disposed outside the one end of the cylinder 2 away from the stopper 4, and the tubular body 10 and the outer peripheral surface 20 of the cylinder 2 surround the pressure chamber 2a. A separating bearing 5 is disposed coaxially outside the cylinder 2, and the separating bearing 5 axially abuts against the piston 3 in the axial direction, and the separating bearing 5 is axially movable relative to the cylinder 2 of the clutch slave cylinder 1. The separating bearing 5 is subjected to the pressure toward the piston 3, and can drive the piston 3 to move axially into the pressure chamber 2a, and drain the oil in the pressure chamber 2a; the oil is filled into the pressure chamber 2a, and the piston 3 is hydraulically pressurized to push the reverse bearing 5 to move in the opposite direction. .

A pretensioning spring 6 is provided on the outer casing of the clutch cylinder 1, and one end of the preloading spring 6 abuts against the clutch cylinder 1, and the other end abuts against the separating bearing 5, and the separating bearing 5 is axially pretensioned. The outer cover of the pretensioning spring 6 is provided with a sealing cover 7, which is axially fixed to the separating bearing 5 and the clutch slave cylinder 1, and the sealing cover 7 seals the clutch slave cylinder 1 to isolate external dust and water pollution. . When the split bearing 5 compresses the pretension spring 6, the seal cover 7 is deformed by compression and elastically deformed.

A receiving groove 23 is formed in the outer peripheral surface 20 of the cylinder block 2, and the stopper 4 is defined in the accommodating groove 23 and protrudes outside the accommodating groove 23 in the radial direction of the cylinder 2. When assembling, the stopper 4 can be inserted into the accommodating groove 23, which is convenient to operate and improves assembly efficiency.

The accommodating groove 23 has two side walls 230 which are disposed opposite to each other in the axial direction of the cylinder block 2. The stopper 4 can be caught between the two side walls 230, and the stopper 4 is axially restricted.

The accommodating groove 23 can be manufactured by mold molding. The accommodating groove 23 is formed in the outer peripheral surface 20 of the cylinder 2 compared to the prior art in which the press-fit groove is formed on the inner peripheral surface of the cylinder block. After the molding, the cylinder 2 is easily released from the outer peripheral surface 20, so that molding is performed. The mold design is simple.

The inner diameter of the cylinder block 2 can be uniform in the axial direction of the cylinder block 2, and no protrusion or groove is formed in the inner peripheral surface 21 of the cylinder block 2, and the cylinder 2 is demolded from the inner peripheral surface 21 easily.

The stopper 4 is annular and surrounds the cylinder 2. The annular stop 4 and the piston 3 can have There is a large overlapping area along the axial direction, which can more effectively block the piston 3 from being pulled out from the cylinder 2.

For ease of installation, the annular stop 4 has a notch 40 in the circumferential direction. At the time of assembly, the notch 40 can be opened, the stopper 4 is placed on the cylinder 2, and moved into the accommodating groove 23, after which the notch 40 is contracted, and the stopper 4 is defined in the accommodating groove 23.

The notch 40 can be made on a closed annular stop 4. Alternatively, the stop 4 can directly utilize a C-ring.

As a further development, the stop can have no cutouts, and the stop is strongly pressed onto the cylinder in the axial direction during installation. In this case, the outer peripheral surface of the cylinder may not be provided with a receiving groove.

In the prior art, in order to facilitate the stamping of the stop ring, the thickness of the stop ring is designed to be thin, so that the stop ring cannot withstand a large axial pressure, causing the piston to have a stop ring and sway away from the cylinder. risk. In the present technical solution, the stopper 4 is not required to be subjected to a punching operation. It is expected that the axial thickness of the stopper 4 can be designed to be thick enough to withstand the large axial force of the piston 3 without being easily deformed, and the stopper 4 can effectively perform the stop function for a long time.

The cylinder block 2 includes: an axially connected first portion 24 and a second portion 25; the second portion 25 is away from the pressure chamber 2a than the first portion 24, the outer diameter of the second portion 25 is smaller than the outer diameter of the first portion 24, and the receiving groove 23 is formed On the outer peripheral surface of the second portion 25. The outer diameter of the second portion 25 is small, so that the notch 40 of the stopper 4 does not need to be opened to a large size, which is advantageous for assembly.

The accommodating groove 23 is cut to the first portion 24 in the axial direction of the cylinder 2. Thus, during assembly, the first portion 24 functions as an assembly location, and when the stop member 4 is moved axially to the first portion 24, it is assembled. After assembly, the stop member 4 is axially abutted with the first portion 24 and is compact in construction.

Both end surfaces 41 of the stopper 4 along the axial direction of the cylinder 2 are flat. Wherein, the surface 41 facing the side of the piston 3 is a plane, which can provide a contact area between the stopper 4 and the piston 3, and enhance the stop effect. Therefore, the stopper 4 can be planar with respect to the surface of the piston 3 at least in the axial direction of the cylinder 2.

As a variant, the stop may have a plurality of stops, all of which are arranged along the circumference of the cylinder. At this time, the outer peripheral surface of the cylinder body is correspondingly provided with a plurality of receiving grooves, and the stoppers may be defined in the corresponding receiving grooves.

Although the present invention has been disclosed above, the present invention is not limited thereto. Any changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be determined by the scope defined by the appended claims.

Claims

A clutch slave cylinder includes: a cylinder block, a piston and a stop member disposed on the cylinder block;

The cylinder is provided with an annular pressure chamber surrounding the central axis of the cylinder, and the piston is used for reciprocating motion in the axial direction of the cylinder within the pressure chamber;

The stopper is located on a side of the piston axially away from the pressure chamber for blocking the piston from falling off the cylinder;

It is characterized in that the stopper is mounted on an outer circumferential surface of the cylinder.
A clutch slave cylinder according to claim 1, wherein said stopper member is elevated outward in the radial direction of said cylinder body from an inner circumferential surface of said piston.
The clutch slave cylinder of claim 1 wherein said clutch slave cylinder is a clutch centering sub-cylinder.
A clutch slave cylinder according to claim 1, wherein an outer peripheral surface of said cylinder block is formed with a receiving groove, and said stopper is defined in said receiving groove and protrudes in a radial direction of said cylinder block Outside the receiving slot.
A clutch slave cylinder according to claim 4, wherein the inner diameter of said cylinder body is uniform in the axial direction of said cylinder block.
A clutch slave cylinder according to claim 4, wherein said cylinder block comprises: a first portion and a second portion that are axially coupled;

The second portion is farther from the pressure chamber than the first portion, the second portion The outer diameter is smaller than the outer diameter of the first portion, and the receiving groove is formed on the outer peripheral surface of the second portion.
A clutch slave cylinder according to claim 6, wherein said receiving groove is cut to the first portion in the axial direction of said cylinder.
A clutch slave cylinder according to any one of claims 1 to 7, wherein the stopper is annular and surrounds the cylinder.
A clutch slave cylinder according to claim 8, wherein said stopper has a notch in the circumferential direction.
The clutch slave cylinder of claim 8 wherein said stop member is a C-ring.
A clutch release system comprising the clutch slave cylinder according to any one of claims 1 to 10.