CN212155768U

CN212155768U - Plastic piston rod of clutch master cylinder

Info

Publication number: CN212155768U
Application number: CN202020831481.1U
Authority: CN
Inventors: 陈铨
Original assignee: Longfa Machinery Co ltd Chengd
Current assignee: Longfa Machinery Co ltd Chengd
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2020-12-15
Anticipated expiration: 2030-05-18

Abstract

The utility model provides a clutch master cylinder plastic piston rod, which relates to the technical field of automobile parts, the material of the piston rod is plastic, the piston rod comprises a piston main body, a reinforcing rib is integrally formed on the outer cylindrical surface of the piston main body, a first annular boss and a second annular boss are respectively integrally formed at the two ends of the piston main body, a first sealing ring groove and a second sealing ring groove are respectively and finely machined on the first annular boss and the second annular boss, and a spring baffle table and a spring shaft are sequentially and integrally formed at one end of the first sealing ring groove, which is far away from the piston main body; an end part blocking table is integrally formed at one end, far away from the piston main body, of the second sealing ring groove, and a push rod abutting groove is formed in the end face of the end part blocking table. The problems that a steel piston rod in an existing clutch master cylinder is high in cost, complex to machine and poor in sealing performance are solved.

Description

Plastic piston rod of clutch master cylinder

Technical Field

The utility model relates to an automobile parts technical field especially relates to a separation and reunion master cylinder plastic piston rod.

Background

The clutch master cylinder is a part which is connected with a clutch pedal and is connected with a clutch booster through an oil pipe, and is used for acquiring pedal stroke information and separating the clutch under the action of the booster. The working principle of the existing clutch master pump is as follows: when a driver steps on the clutch pedal, the push rod pushes the piston to move in the piston cavity to extrude the cavity of the pump so as to increase the oil pressure, pressure oil is sent into the branch pump through the oil outlet hole of the cavity of the pump, the pull rod of the branch pump is forced to push the release fork, and the release bearing is pushed forwards; when the driver releases the clutch pedal, the hydraulic pressure is released, the piston returns to the initial position under the action of the return spring, the movement of the piston is transmitted to the release fork through the push rod to gradually return to the original position, and the clutch is in an engaged state again.

The piston rod in the existing clutch master cylinder is made of Q235 and other steel materials, and is machined in a machining workshop through machining procedures such as turning, milling, drilling and the like, so that the machining procedures are complex, the efficiency is low, the cost is high, the piston rod has large self weight, and the sealing performance of the piston rod in the sliding process in a piston cavity is reduced.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned problem among the prior art, the utility model provides a separation and reunion master cylinder plastic piston rod has solved among the current separation and reunion master cylinder that the steel piston rod is with high costs, the complicated and not good problem of leakproofness of processing.

In order to achieve the purpose of the invention, the technical scheme adopted by the utility model is as follows:

the plastic piston rod of the clutch master cylinder is made of plastic and comprises a piston main body, a reinforcing rib is integrally formed on the outer cylindrical surface of the piston main body, a first annular boss and a second annular boss are respectively integrally formed at two ends of the piston main body, a first sealing ring groove and a second sealing ring groove are respectively and finely machined on the first annular boss and the second annular boss, and a spring baffle table and a spring shaft are sequentially and integrally formed at one end, far away from the piston main body, of the first sealing ring groove; an end part blocking table is integrally formed at one end, far away from the piston main body, of the second sealing ring groove, and a push rod abutting groove is formed in the end face of the end part blocking table.

The utility model has the advantages that: the outer cylindrical surface, the first annular boss and the second annular boss of the piston main body can be encircled with the pump body wall of the clutch master cylinder to form a piston cavity of the clutch master cylinder, the spring shaft is used for being inserted into a return spring in the clutch master cylinder, and the spring blocking table is used for fixing one end of the return spring; the push rod abutting groove is used for inserting and abutting a push rod in the master cylinder to push the piston rod to move. First seal ring groove and second seal ring groove are used for installing the sealing member, can enough guarantee the installation accuracy of the relatively poor sealing member of rigidity through first seal ring groove and second seal ring groove, can carry on spacingly to the sealing member again, prevent to produce along with the round trip movement of piston rod and slide and influence its reliability.

The material of piston rod is plastics, makes its overall structure can pass through injection mold integrated into one piece, and processing is swift, and the process is simple, can mass production, and the plastics material is compared in under the same structure of steel the dead weight littleer, more light, installs the piston rod in the piston chamber, and the dynamic seal nature between piston rod and piston chamber wall is better, can improve the performance of separation and reunion master pump.

After injection molding, the plastic piston rod can ensure the processing precision by finish machining the first sealing ring groove and the second sealing ring groove by a lathe so as to improve the mounting precision of the sealing ring and ensure that the piston rod and the piston cavity have good sealing performance. The reinforcing rib that the plastics piston rod set up in the piston main part can improve the intensity of piston main part, improves the life of piston rod.

Drawings

Fig. 1 is a schematic structural diagram of a plastic piston rod of a clutch master cylinder.

Fig. 2 is a sectional view taken along a-a in fig. 1.

Wherein, 1, a piston main body; 2. reinforcing ribs; 21. axial reinforcing ribs; 22. circumferential reinforcing ribs; 3. a first annular boss; 31. a first seal ring groove; 4. a second annular boss; 41. a second seal ring groove; 5. a spring stop table; 6. a spring shaft; 7. an end stop; 8. the push rod is abutted against the groove; 81. a spherical groove; 82. a tapered groove; 9. a marking platform.

Detailed Description

The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and various changes will be apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all inventions contemplated by the present invention are protected.

As shown in fig. 1, the plastic piston rod of the clutch master cylinder is made of plastic, preferably PA66 nylon, and includes a piston body 1, and a reinforcing rib 2 is integrally formed on an outer cylindrical surface of the piston body 1. The reinforcing rib 2 comprises an axial reinforcing rib 21 and a circumferential reinforcing rib 22, the cross section of the axial reinforcing rib 21 is rectangular and extends along the axial direction of the piston main body 1, and the circumferential reinforcing rib 22 is annular and is integrally formed on the outer cylindrical surface of the piston main body 1. The axial reinforcing ribs 21 and the circumferential reinforcing ribs 22 can improve the circumferential and axial strength to make up for the defect that the strength of the plastic part is not as high as that of the steel part.

As shown in fig. 2, four axial reinforcing ribs 21 are uniformly distributed along the circumferential direction of the piston main body 1, and the uniformly distributed axial reinforcing ribs 21 make the structure of the piston main body 1 more symmetrical and the strength at each position more uniform. One end of the axial reinforcing rib 21 is fixed on the first annular boss 3, the other end of the axial reinforcing rib is fixed on the second annular boss 4, and the axial reinforcing rib 21 and the annular bosses at the two ends form a whole, so that the strength is further improved. The circumferential bead 22 is located at the axial middle of the axial bead 21 to improve symmetry.

The marking platform 9 is integrally formed at the intersection of the axial reinforcing ribs 21 and the circumferential reinforcing ribs 22, and the marking surface of the marking platform 9 is not higher than the highest surface of the reinforcing ribs 2 in the radial direction. The marking platform 9 can be used for marking information such as batch numbers of parts, so that tracking management is facilitated, and the processing quality is guaranteed.

A first annular boss 3 and a second annular boss 4 are respectively and integrally formed at two ends of the piston main body 1, and a first seal ring groove 31 and a second seal ring groove 41 are respectively and finely machined on the first annular boss 3 and the second annular boss 4. The first annular boss 3 and the second annular boss 4 are coaxially provided with the piston main body 1, and a first seal ring groove 31 and a second seal ring groove 41 are coaxially provided with the first annular boss 3 and the second annular boss 4, respectively.

The outer diameters of the first annular boss 3 and the second annular boss 4 are equal, and the machining tolerance is controlled to be-0.06 mm-0.01 mm, so that in the reciprocating movement process of the piston rod in a pump cavity of the clutch master cylinder, enough clearance is formed between the outer cylindrical surfaces of the first annular boss 2 and the second annular boss 3 and the wall of the pump cavity, abrasion cannot be caused, meanwhile, the clearance cannot be too large, sealing can be performed through mounting a sealing piece, and the sealing difficulty is reduced.

The coaxiality tolerance of the bottom surface of the first seal ring groove 31 and the outer cylindrical surface of the first annular boss 3 is not more than phi 0.05mm, and the coaxiality tolerance of the bottom surface of the second seal ring groove 41 and the outer cylindrical surface of the second annular boss 4 is not more than phi 0.05 mm. In the injection molding process, the outer cylindrical surfaces of the first annular boss 3 and the second annular boss 4 and the first seal ring groove 31 and the second seal ring groove 41 need to be reserved with machining allowances, and the mold is clamped on a lathe for finish machining after injection molding so as to ensure the machining precision.

The cross sections of the first seal ring groove 31 and the second seal ring groove 41 are rectangular, the diameters of the bottom surfaces of the first seal ring groove 31 and the second seal ring groove 41 are not larger than the outer diameter of the piston body 1, the width machining tolerance of the first seal ring groove 31 and the second seal ring groove 41 is controlled to be 0-0.2 mm, the machining tolerance of the diameter of the bottom surface is controlled to be 0-0.1 mm, and the roughness Ra of the inner wall surface is not larger than 3.2. The first and second seal grooves 31 and 41 are used to mount a seal packing as a seal for sealing the piston chamber.

The end of the first seal ring groove 31 far away from the piston body 1 is integrally formed with a spring stop 5 and a spring shaft 6 in sequence. The spring shaft 6 and the spring blocking table 5 are coaxially arranged, the spring shaft 6 is a conical shaft, and the large-diameter end of the conical shaft is fixedly connected with the spring blocking table 5. The spring shaft 6 is used for being inserted into a return spring in the clutch master cylinder, and the spring stop table 5 is used for fixing one end of the return spring.

An end part baffle table 7 is integrally formed at one end of the second seal ring groove 41 far away from the piston main body 1, and a push rod abutting groove 8 is arranged on the end surface of the end part baffle table 7. The push rod abutting groove 8 is used for inserting and abutting a push rod in the master cylinder to push the movement of the piston rod.

The push rod abutting groove 8 comprises a spherical groove 81 and a conical groove 82 which are connected in sequence, the spherical groove 81 is tangent to the side surface of the conical groove 82, the conical groove 82 is communicated with the end surface of the piston main body 1, and the large-diameter end of the conical groove 82 is positioned at one end far away from the spherical groove 81. The taper angle of the tapered groove 82 is 70-75 deg. The insertion of the push rod can be guided through the conical surface of the conical groove 82, the push rod can be accurately inserted into the push rod abutting groove 8 to push the piston rod to move, the spherical groove 81 is matched with the spherical surface of the end part of the push rod, the conical groove 82 and the spherical groove 81 are tangentially arranged, even if the push rod is inserted into the push rod abutting groove 8 at a certain offset angle, a large action surface is still formed, and the reliability of action on the piston rod is improved.

Claims

1. A clutch master cylinder plastic piston rod is characterized in that the material is plastic and comprises a piston main body, a reinforcing rib is integrally formed on the outer cylindrical surface of the piston main body, a first annular boss and a second annular boss are respectively integrally formed at two ends of the piston main body, a first sealing ring groove and a second sealing ring groove are respectively and finely machined on the first annular boss and the second annular boss, and a spring baffle table and a spring shaft are sequentially and integrally formed at one end, far away from the piston main body, of the first sealing ring groove; an end part blocking table is integrally formed at one end, far away from the piston main body, of the second sealing ring groove, and a push rod abutting groove is formed in the end face of the end part blocking table.

2. The clutched master cylinder plastic piston rod of claim 1, wherein the first annular land and the second annular land are of equal outer diameter.

3. The plastic piston rod of clutch master cylinder according to claim 1, characterized in that the reinforcing ribs include an axial reinforcing rib and a circumferential reinforcing rib, the cross section of the axial reinforcing rib is rectangular and extends along the axial direction of the piston main body, and the circumferential reinforcing rib is annular and is integrally formed on the outer cylindrical surface of the piston main body.

4. The plastic piston rod of clutch master cylinder according to claim 3, characterized in that four axial reinforcing ribs are uniformly distributed along the circumferential direction of the piston main body, one end of each axial reinforcing rib is fixed on the first annular boss, the other end of each axial reinforcing rib is fixed on the second annular boss, and the circumferential reinforcing rib is located in the axial middle of the axial reinforcing rib.

5. The plastic piston rod of clutch master cylinder according to claim 3 or 4, characterized in that a marking platform is arranged at the intersection of the axial reinforcing rib and the circumferential reinforcing rib.

6. The plastic piston rod of clutch master cylinder according to claim 1, characterized in that the coaxiality tolerance of the bottom surface of the first seal ring groove and the outer cylindrical surface of the first annular boss is not more than phi 0.05mm, and the coaxiality tolerance of the bottom surface of the second seal ring groove and the outer cylindrical surface of the second annular boss is not more than phi 0.05 mm.

7. The clutched master cylinder plastic piston rod of claim 1, wherein the spring shaft is disposed coaxially with the spring stop.

8. The plastic piston rod of clutch master cylinder according to claim 1, characterized in that the spring shaft is a conical shaft, and the large diameter end of the conical shaft is fixedly connected with the spring stop.

9. The plastic piston rod of clutch master cylinder according to claim 1, characterized in that the push rod abutting groove comprises a spherical groove and a conical groove which are connected in sequence, the spherical groove is tangent to the side surface of the conical groove, the conical groove opens onto the end surface of the piston main body, and the large diameter end of the conical groove is located at one end far away from the spherical groove.

10. The plastic piston rod of clutch master cylinder according to claim 9, characterized in that the taper angle of the tapered groove is 70 ° to 75 °.