Clutch master cylinder structure

Abstract

The utility model relates to the field of clutch master pumps, and discloses a clutch master pump structure which comprises an oil storage tank assembly and a pump body assembly, the pump body assembly comprises a cylinder body, the oil storage tank assembly is installed on the cylinder body, a compensation hole is formed in the cylinder body, and the compensation hole penetrates through the cylinder body; the compensation hole is communicated with the oil storage tank assembly; a piston and a sealing structure installed on the piston are installed in the cylinder body, the compensation hole is located in the stroke path of the sealing structure, and the sealing structure can block communication between the compensation hole and an inner cavity of the cylinder body. The compensation hole comprises a hole part at the upper end and a transition part at the lower end, and the caliber of the transition part is larger than that of the hole part. The master cylinder assembly has the advantages of being small in leather cup abrasion, long in service life and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to clutch master cylinder field, especially a clutch master cylinder structure. BACKGROUND

[0002] Chinese patent CN212202908U discloses a clutch master cylinder, which adopts the mode of compensation hole to satisfy oil pressure balance, but the clutch master cylinder with the compensation hole structure has the defects that the product cannot work for a long time, the main skin bowl is extruded into the inside of the compensation hole under high pressure due to the friction between the main skin bowl and the compensation hole, and the main skin bowl is deformed and even damaged after a long time, so that the product cannot build pressure normally, the product fails and the service life of the product is reduced. SUMMARY

[0003] The utility model provides a clutch master cylinder structure aiming at the defects in the prior art.

[0004] In order to solve the above technical problems, the utility model solves them through the following technical schemes:

[0005] A clutch master cylinder structure, comprising an oil tank assembly and a pump body assembly, the pump body assembly comprising a cylinder body, the oil tank assembly being installed on the cylinder body, the cylinder body being provided with a compensation hole, the compensation hole penetrating through the cylinder body; the compensation hole being in communication with the oil tank assembly; a piston and a sealing structure installed on the piston being installed in the cylinder body, the compensation hole being located on the stroke path of the sealing structure, the sealing structure being capable of blocking the communication between the compensation hole and the inner chamber of the cylinder body; the compensation hole comprising a hole part at the upper end and a transition part at the lower end, the caliber of the transition part being larger than that of the hole part.

[0006] Preferably, the transition part is in the shape of a horn with a small upper end and a large lower end.

[0007] Preferably, the left side of the transition part is in the shape of an arc.

[0008] Preferably, in the initial state, the sealing structure is located on the inner side of the transition part, and there is a gap between the sealing structure and the mouth part of the transition part; the sealing structure can close the transition part after moving leftward by a certain stroke.

[0009] Preferably, the sealing part is a sealing skin bowl, which is installed on the piston.

[0010] Preferably, the piston divides the cylinder body into a left chamber and a right chamber, and a channel is further provided on the cylinder body, the channel always connecting the oil tank assembly and the right chamber; the compensation hole is in communication with the left chamber.

[0011] As preferred, the piston comprises a head part and a shaft part, limit rings are arranged at the left end and the right end of the head part, a supporting ring is sleeved between the limit rings and is attached to the inner wall of the cylinder body; the left end of the head part is provided with an annular mounting groove, and the sealing part is mounted in the mounting groove; the outer diameter of the shaft part is smaller than that of the head part, a right cavity is formed between the shaft part and the inner wall of the cylinder body, a stop ring is arranged at the right end of the inner wall of the cylinder body, and the piston abuts against the stop ring in the initial state; and the channel is communicated to the left end of the right cavity.

[0012] Compared with the prior art, the new structure moves the compensation hole position upward to avoid contact with the main leather bowl, and the initial contact position of the cylinder body and the leather bowl is smoothly transitioned by an arc, thereby reducing the wear of the main leather bowl during operation, and the service life of the clutch master pump is increased. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a schematic diagram of the prior design.

[0014] Figure 2 is a schematic diagram of the overall structure of the device.

[0015] Figure 3 is a schematic diagram of the structure of the compensation hole.

[0016] The technical names of the reference signs in the drawings are: 100 - oil tank assembly, 101 - pump body assembly, 102 - cylinder body, 103 - compensation hole, 104 - piston, 105 - sealing structure, 106 - hole part, 107 - transition part, 108 - arc line, 109 - gap, 110 - channel, 111 - head part, 112 - shaft part, 113 - limit ring, 114 - supporting ring, 115 - mounting groove, 116 - stop ring, 117 - left cavity, 118 - right cavity. DETAILED DESCRIPTION

[0017] The utility model will be described in further detail below in combination with the drawings and examples.

[0018] Example 1

[0019] The clutch master cylinder structure comprises a reservoir assembly 100 and a pump body assembly 101, the pump body assembly 101 comprises a cylinder body 102, the reservoir assembly 100 is installed on the cylinder body 102, the cylinder body 102 is provided with a compensation hole 103 penetrating through the cylinder body 102, the compensation hole 103 is communicated with the reservoir assembly 100, a piston 104 and a sealing structure 105 installed on the piston 104 are installed in the cylinder body 102, the compensation hole 103 is located on a stroke path of the sealing structure 105, and the sealing structure 105 can block the communication between the compensation hole 103 and an inner cavity of the cylinder body 102; the compensation hole 103 comprises a hole part 106 at an upper end and a transition part 107 at a lower end, and the caliber of the transition part 107 is larger than that of the hole part 106. In the prior art, the vertical edge of the compensation hole 103 and the fact that the rubber cup provides sealing and pressure at the same time due to the product characteristics of the rubber cup cause the lip of the rubber cup to release the pressure borne by the lip and extend outward into the compensation hole 103 when the rubber cup reaches the compensation hole position, and the lip is separated from the compensation hole when the rubber cup continues to move left, and the lip and the edge of the compensation hole rub back and forth in the process, and the edge is equivalent to a knife edge that wears the lip of the rubber cup.

[0020] In the scheme, the contact mode of the two is realized by changing the shape of the mouth part, the lip and the inner wall of the cylinder body 102 are always in surface contact in the whole process, and wear is avoided.

[0021] In the scheme, the shape of the transition part 107 is a horn shape with a small upper end and a large lower end. Since the piston 104 can only move left due to the right end limit in the initial position, the sealing structure 105 will only contact the left part of the transition part 107, and therefore the edge line of the left part of the transition part 107 is an arc line 108 in the scheme. The whole process is a circular arc transition, so that wear does not occur during the left and right movement of the sealing structure 105.

[0022] In the initial state, the sealing structure 105 is located on the inner side of the transition part 107, and there is a gap 109 between the sealing structure 105 and the mouth part of the transition part 107; the sealing structure 105 can close the transition part 107 after moving left by a certain stroke. The structure design can first meet the design requirements of the empty stroke, and secondly, compared with the prior art, the sealing structure 105 is sealed or unsealed with the left part of the transition part 107 during the left and right movement, so that the number of wear and the position where damage may occur are reduced.

[0023] Obviously, the sealing part is a sealing rubber cup, the sealing rubber cup is installed on the piston 104, and the sealing rubber cup comprises an external sealing lip that can be small in the lip opening under pressure to realize pressure sealing.

[0024] The piston 104 divides the cylinder 102 into a left cavity 117 and a right cavity 118. The cylinder 102 is further provided with a passage 110, which is always in communication with the right cavity 118 and the oil tank assembly 100. The compensation hole 103 is in communication with the left cavity 117. The piston 104 comprises a head 111 and a shaft 112. The left end and the right end of the head 111 are provided with limit rings 113. The limit rings 113 are sleeved with a support ring 114, which is in close contact with the inner wall of the cylinder 102. The left end of the head 111 is provided with an annular mounting groove 115, in which a sealing part is mounted. The outer diameter of the shaft 112 is smaller than that of the head 111. The right cavity 118 is formed between the shaft 112 and the inner wall of the cylinder 102. The right end of the inner wall of the cylinder 102 is provided with a stop ring 116. In the initial state, the piston 104 abuts against the stop ring 116. The passage 110 is connected to the left end of the right cavity 118.

[0025] Embodiment 2

[0026] The difference between this embodiment and Embodiment 1 is that the sealing structure 105 is a rubber part.

[0027] Embodiment 3

[0028] The difference between this embodiment and Embodiment 1 is that the passage 110 is inclined. The oil in the right cavity 118 can enter the left cavity 117 through the gap 109 formed by opening the seal between the sealing structure 105 and the inner wall of the cylinder 102.

Claims

1. A clutch master cylinder structure characterized by: The application relates to a pump body assembly (101) and an oil tank assembly (100), wherein the oil tank assembly (100) is installed on the cylinder body (102), the cylinder body (102) is provided with a compensation hole (103) penetrating through the cylinder body (102), the compensation hole (103) is communicated with the oil tank assembly (100), the cylinder body (102) is provided with a piston (104) and a sealing structure (105) installed on the piston (104), the compensation hole (103) is located on the stroke path of the sealing structure (105), the sealing structure (105) can block the communication between the compensation hole (103) and the inner chamber of the cylinder body (102), the compensation hole (103) comprises a hole part (106) at the upper end and a transition part (107) at the lower end, and the caliber of the transition part (107) is larger than that of the hole part (106).

2. A master clutch pack arrangement according to claim 1, wherein: The caliber of the transition part (107) is in a horn shape with the caliber gradually increasing from the upper end to the lower end.

3. A master clutch pack arrangement according to claim 1, wherein: The edge line of the left part of the transition part (107) is an arc line (108).

4. A master clutch pack arrangement according to claim 1, wherein: In the initial state, the sealing structure (105) is located on the inner side of the transition part (107), and a gap (109) exists between the sealing structure (105) and the opening of the transition part (107); the sealing structure (105) can close the transition part (107) after moving leftwards by a stroke.

5. A clutch master cylinder arrangement according to claim 1 or 2 or 3 or 4 wherein: The sealing part is a sealing leather cup, and the sealing leather cup is installed on the piston (104).

6. A clutch master cylinder arrangement according to claim 1 or 2 or 3 or 4 wherein: The cylinder body (102) is divided into a left chamber (117) and a right chamber (118) by the piston (104), the cylinder body (102) is further provided with a channel (110) always communicating the oil tank assembly (100) with the right chamber (118), and the compensation hole (103) can be communicated with the left chamber (117).

7. A master clutch pack arrangement according to claim 6, wherein: The piston (104) comprises a head part (111) and a shaft part (112), the left end and the right end of the head part (111) are provided with limiting rings (113), the supporting ring (114) is sleeved between the limiting rings (113), the supporting ring (114) is attached to the inner wall of the cylinder body (102), the left end of the head part (111) is provided with an annular mounting groove (115), the sealing part is installed in the mounting groove (115), the outer diameter of the shaft part (112) is smaller than that of the head part (111), the right chamber (118) is formed between the shaft part (112) and the inner wall of the cylinder body (102), the right end of the inner wall of the cylinder body (102) is provided with a check ring (116), the piston (104) abuts against the check ring (116) in the initial state, and the channel (110) is communicated with the left end of the right chamber (118).

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