Clutch actuating mechanism with sealing and dustproof functions

Abstract

The invention relates to a clutch actuating mechanism, and provides a clutch actuating mechanism with sealing and dustproof functions in order to solve the technical problem that an existing clutch sealing structure is poor in isolation effect, the clutch actuating mechanism comprises an outer side sealing assembly arranged between a piston and a shell, and an inner side sealing assembly arranged between the piston and a release bearing and between the piston and a pipeline sleeve; the outer side sealing assembly comprises an outer dust cover, a felt and an outer sealing ring; the outer dust cover is clamped with a mounting groove in the piston through a boss; the felt is installed on the inner side of the outer dust cover and makes contact with the outer surface of the shell. The piston is sealed with the inner surface of the shell through the outer sealing ring; the inner side sealing assembly comprises an inner dust cover, an O-shaped ring and an inner sealing ring, the rear end of the inner dust cover is connected with the pipeline sleeve, the front end of the inner dust cover is provided with an annular groove protrusion and a plurality of sealing protrusions, the annular groove protrusion is matched with an annular groove in the piston, and the sealing protrusions are installed in the sealing grooves in the piston in a matched mode. And an O-shaped ring and an inner sealing ring are arranged on the connecting surface of the piston and the pipeline sleeve.

Description

Technical Field

[0001] The invention relates to a clutch, in particular to a clutch actuator with sealing and dustproof functions. Background Art

[0002] With the rapid development of intelligent products, the clutch actuator, as one of the core parts of intelligent products, has attracted much attention. Since the clutch actuator is assembled between the engine and the transmission, the disassembly and maintenance costs are high, so the OEMs and users require the clutch actuator to have a long life and high reliability.

[0003] One of the key factors restricting the long life and high reliability of the clutch actuator is dust prevention. Metal chips and impurities generated during vehicle driving will enter the clutch actuator, causing the clutch actuator to get stuck, the sealing ring to crack, and poor sealing. Many clutch actuator products have poor dust prevention effects, resulting in their life and reliability failing to meet user requirements.

[0004] The patent number is 2022229200542, and the name is a Chinese patent for a clutch actuator with a new dustproof structure. On the piston assembly of the clutch actuator, an O-ring is arranged between the inner dust cover fixing sleeve and the piston to form a transition fit between the inner dust cover fixing sleeve and the core shaft to prevent dust or other pollutants from entering the air pressure cavity from the gap between the piston and the core shaft, thereby extending the service life of the clutch actuator. However, it is impossible to completely isolate dust or other pollutants only by the inner dust cover, and its dustproof effect needs to be improved, which cannot meet the user's high requirements for the sealing performance of the clutch actuator. Therefore, it is necessary to design an efficient and stable sealing structure to meet user requirements. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problem that the sealing structure of the existing clutch actuator cannot completely isolate dust or other pollutants, and to provide a clutch actuator with a sealing and dustproof function.

[0006] To achieve the above objectives, the technical solution proposed by the present invention is:

[0007] A clutch actuator with sealing and dustproof function, comprising a pipe sleeve sleeved on a shaft of a transmission, a piston and a housing sleeved on the pipe sleeve, a front end of the piston installed in the housing, and a rear end connected to a release bearing through a wave spring clamp; the special feature of the clutch actuator is that an outer sealing component is arranged between the piston and the housing, and an inner sealing component is arranged between the piston, the release bearing and the pipe sleeve;

[0008] The outer sealing assembly includes an outer dust cover, a felt and an outer sealing ring. A boss is arranged on the outer side of one end of the outer dust cover, and a mounting groove is arranged on the piston. The outer dust cover is clamped with the mounting groove on the piston through the boss, and the piston can drive the outer dust cover to move axially; a felt mounting groove is arranged on the inner side of the other end of the outer dust cover, and the felt is installed in the felt mounting groove. The inner side of the felt contacts the outer surface of the shell, and is used to form a seal between the piston and the outer surface of the shell; the piston forms a seal with the inner surface of the shell through the outer sealing ring;

[0009] The inner sealing assembly includes an inner dust cover, an O-ring and an inner sealing ring. The rear end of the inner dust cover is connected to the pipe sleeve, and the front end of the inner dust cover is arranged between the connecting surface of the release bearing and the piston. The front end of the inner dust cover is provided with a ring groove protrusion and a plurality of sealing protrusions. The ring groove protrusion is used to cooperate with the ring groove on the piston and abut against the ring groove in the axial direction through the release bearing; the plurality of sealing protrusions are located on the outer peripheral surface of the front end of the inner dust cover, and are respectively adapted to be installed with the plurality of sealing grooves on the piston, so as to form a seal between the piston and the release bearing; the O-ring and the inner sealing ring are provided on the connecting surface between the piston and the pipe sleeve, so as to form a seal between the connecting surface of the piston and the pipe sleeve.

[0010] Furthermore, an outer sealing ring installation groove is provided at the front end of the piston, the outer sealing ring is installed in the outer sealing ring installation groove, and the outer side of the outer sealing ring abuts against the inner surface of the shell to form a seal between the piston and the inner surface of the shell.

[0011] Furthermore, an O-ring installation groove for installing an O-ring and an inner sealing ring installation groove for installing an inner sealing ring are provided on the connection surface between the piston and the pipe sleeve, and the O-ring is interference-fitted to fix the O-ring fixing ring on the pipe sleeve to form a first seal between the connection surface of the piston and the pipe sleeve;

[0012] The inner sealing ring is installed in the inner sealing ring installation groove and is used to form a second seal between the connecting surface of the piston and the pipe sleeve.

[0013] Furthermore, a retaining ring is provided at the rear end of the inner dust cover, and the inner dust cover is fixed on the pipe sleeve by interference fit through the retaining ring, and the release bearing drives the front end of the inner dust cover to move axially.

[0014] Furthermore, the inner sealing ring and the outer sealing ring are both lip sealing rings;

[0015] The cross-sectional structure of the lip seal ring is Z-shaped, including a first lip angle, a second lip angle, a third lip angle and a fourth lip angle arranged in sequence along the outer periphery of the cross-sectional surface, and is used to abut against different corners of the inner seal ring mounting groove or the outer seal ring mounting groove to form different forms of seals.

[0016] Furthermore, the first lip angle on the inner sealing ring is located at the upper rear corner of the inner sealing ring mounting groove near the rear end of the piston, and is used to form a support between the connecting surface of the piston and the pipe sleeve; the second lip angle is located at the lower rear corner of the inner sealing ring mounting groove near the rear end of the piston, and is used to form a dustproof seal between the connecting surface of the piston and the pipe sleeve; the third lip angle and the fourth lip angle are respectively located at the upper front corner and the lower front corner of the inner sealing ring mounting groove away from the rear end of the piston, and are used to form a gas flow seal between the connecting surface of the piston and the pipe sleeve.

[0017] Furthermore, the first lip angle on the outer sealing ring is located at the rear lower corner of the outer sealing ring mounting groove near the rear end of the piston, and is used to form a support between the piston and the housing; the second lip angle is located at the rear upper corner of the outer sealing ring mounting groove near the rear end of the piston, and abuts against the inner surface of the housing, and is used to form a dustproof seal between the connecting surfaces of the piston and the housing; the third lip angle and the fourth lip angle are respectively located at the front upper corner and the front lower corner of the outer sealing ring mounting groove away from the rear end of the piston, and are used to form a gas flow seal between the connecting surfaces of the piston and the housing.

[0018] Furthermore, interference fitting is performed between the O-ring fixing ring and the pipe sleeve, and between the rear end of the inner dust cover and the pipe sleeve.

[0019] Furthermore, the distribution positions and number of the plurality of sealing protrusions are the same as the distribution positions and number of the sealing grooves.

[0020] Beneficial effects of the present invention:

[0021] [1] The clutch actuator with sealing and dustproof function of the present invention adopts an outer sealing component and an inner sealing component to seal and protect it, which effectively improves the protection effect of the device, ensures the cleanliness of each part in the clutch cavity, improves the stability and reliability of the overall structure, prolongs the service life of the clutch, saves production resources, greatly improves the isolation effect of dust, metal chips or other pollutants, and effectively ensures the good sealing performance of the clutch actuator.

[0022] [2] The inner dust cover of the present invention can effectively prevent the metal chips from the wear of the separation bearing and the clutch from falling onto the surface of the pipe sleeve during the use of the clutch actuator, thereby causing the clutch actuator to get stuck and damaging the sealing ring, thereby effectively improving the sealing performance of the clutch, extending its service life, and ensuring the cleanliness of the cavity.

[0023] [3] The inner sealing ring and the outer sealing ring of the present invention are both lip-shaped sealing rings, which form different forms of seals on the connecting surface between the piston and the pipe sleeve and the connecting surface between the piston and the housing through different lip angles of the lip-shaped sealing ring, thereby effectively improving the sealing and dustproof performance of the clutch actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A cross-sectional structural diagram of an embodiment of a clutch actuator with sealing and dustproof function of the present invention;

[0025] Figure 2 It is a partial enlarged view of the inner dust cover in the embodiment of the present invention;

[0026] Figure 3 Schematic diagram of the installation positions of the inner sealing ring and the outer sealing ring in an embodiment of the present invention;

[0027] Figure 4 Schematic diagram of the structure of the piston inlet / exhaust groove, the ring groove and the sealing groove in the embodiment of the present invention;

[0028] Figure 5 A schematic diagram of a clutch engagement process in an embodiment of the present invention;

[0029] Figure 6 A schematic diagram of a clutch disengagement process in an embodiment of the present invention;

[0030] Reference numerals:

[0031] 1-outer dust cover, 2-piston, 3-felt, 4-outer sealing ring, 5-housing, 6-pipe sleeve, 7-inner sealing ring, 8-inner dust cover, 9-O-ring fixing ring, 10-O-ring, 11-retaining ring, 12-release bearing, 13-wave spring clip, 14-ring groove protrusion, 15-sealing protrusion, 16-ring groove, 17-sealing groove, 18-first lip angle, 19-second lip angle, 20-third lip angle, 21-fourth lip angle, 22-inlet / exhaust groove, 23-first cavity, 24-second cavity. DETAILED DESCRIPTION

[0032] like Figure 1 As shown, a clutch actuator with sealing and dustproof function comprises a pipe sleeve 6 sleeved on a shaft of a transmission, a piston 2 and a housing 5 are sleeved on the pipe sleeve 6, a front end of the piston 2 is installed in the housing 5, and a rear end is connected to a release bearing 12 through a wave spring clamp 13, the housing 5 is fixedly connected to the pipe sleeve 6, an outer sealing component is arranged between the piston 2 and the housing 5, and an inner sealing component is arranged between the piston 2 and the release bearing 12 and the pipe sleeve 6; the inner sealing component is designed mainly to prevent metal chips and impurities from entering the clutch, and the outer sealing component is designed mainly to prevent external impurities from entering the clutch;

[0033] The outer sealing assembly includes an outer dust cover 1, a felt 3 and an outer sealing ring 4. A boss is arranged on the outer side of one end of the outer dust cover 1, and a mounting groove is arranged on the piston 2. The outer dust cover 1 is clamped with the mounting groove on the piston 2 through the boss, and the piston 2 can drive the outer dust cover 1 to move axially; a felt mounting groove is arranged on the inner side of the other end of the outer dust cover 1, and the felt 3 is installed in the felt mounting groove. The inner side of the felt 3 contacts the outer surface of the shell 5, and is used to form a seal between the piston 2 and the outer surface of the shell 5; the piston 2 forms a seal with the inner surface of the shell 5 through the outer sealing ring 4; the outer dust cover 1 and the felt 3 are mainly used to prevent external impurities from entering the clutch cavity; the outer sealing ring 4 is mainly used to protect residual impurities passing through the felt 3.

[0034] like Figure 2 As shown, the inner sealing assembly includes an inner dust cover 8, an O-ring 10 and an inner sealing ring 7. The inner dust cover 8 is used to protect the pipe sleeve 6 and all adjacent parts through its ductility within the full stroke of the piston 2. A retaining ring 11 is provided at the rear end of the inner dust cover 8. The inner dust cover 8 is fixed on the pipe sleeve 6 by interference fit through the retaining ring 11, and the release bearing 12 drives the front end of the inner dust cover 8 to move axially; the inner dust cover 8 can effectively prevent the release bearing 12 and the metal chips worn by the clutch from falling onto the surface of the pipe sleeve 6 during use, thereby causing the clutch actuator to get stuck and damage the sealing ring, effectively improving the sealing performance of the clutch and extending its service life.

[0035] like Figure 4 As shown, the front end of the inner dust cover 8 is arranged between the connection surface of the release bearing 12 and the piston 2, and the front end of the inner dust cover 8 is provided with a ring groove protrusion 14 and a plurality of sealing protrusions 15. The ring groove protrusion 14 is used to cooperate with the ring groove 16 on the piston 2, and is pressed and constrained by the release bearing 12 to move in the axial direction, and at the same time abuts against the ring groove 16; the plurality of sealing protrusions 15 are located on the outer peripheral surface of the front end of the inner dust cover 8, and are respectively adapted to be installed with the plurality of sealing grooves 17 on the piston 2. The distribution position and number of the plurality of sealing protrusions 15 are the same as the distribution position and number of the sealing grooves 17, and are used to form a seal between the piston 2 and the release bearing 12; an O-ring 10 and an inner sealing ring 7 are provided on the connection surface between the piston 2 and the pipe sleeve 6, and are used to form a seal between the connection surface of the piston 2 and the pipe sleeve 6. The O-ring 10 is mainly used to protect the residual metal chips and impurities passing through the inner dust cover 8, and the inner sealing ring 7 is mainly used to protect other impurities from entering the clutch.

[0036] An O-ring mounting groove for mounting an O-ring 10 and an inner sealing ring mounting groove for mounting an inner sealing ring 7 are provided on the connecting surface between the piston 2 and the pipe sleeve 6. The O-ring 10 fixes the O-ring fixing ring 9 on the pipe sleeve 6 with interference fit to form a first seal between the connecting surfaces of the piston 2 and the pipe sleeve 6; the inner sealing ring 7 is installed in the inner sealing ring mounting groove to form a second seal between the connecting surfaces of the piston 2 and the pipe sleeve 6.

[0037] like Figure 3 As shown, the inner sealing ring 7 and the outer sealing ring 4 are both lip sealing rings; the cross-sectional structure of the lip sealing ring is Z-shaped, including a first lip corner 18, a second lip corner 19, a third lip corner 20 and a fourth lip corner 21 arranged in sequence along the outer periphery of the cross-section, which are used to abut against different corners of the inner sealing ring mounting groove or the outer sealing ring mounting groove to form different forms of seals.

[0038] The inner sealing ring 7 is a lip-shaped sealing ring. The first lip corner 18 on the inner sealing ring 7 is located at the upper rear corner of the inner sealing ring mounting groove near the rear end of the piston 2, and is used to form a support between the connecting surface of the piston 2 and the pipe sleeve 6; the second lip corner 19 is located at the lower rear corner of the inner sealing ring mounting groove near the rear end of the piston 2, and is used to form a dustproof seal between the connecting surface of the piston 2 and the pipe sleeve 6; the third lip corner 20 and the fourth lip corner 21 are respectively located at the upper front corner and the lower front corner of the inner sealing ring mounting groove away from the rear end of the piston 2, and are used to form a gas flow seal between the connecting surface of the piston 2 and the pipe sleeve 6.

[0039] The first lip corner 18 on the outer sealing ring 4 is located at the rear lower corner of the outer sealing ring mounting groove near the rear end of the piston 2, and is used to form a support between the piston 2 and the housing 5; the second lip corner 19 is located at the rear upper corner of the outer sealing ring mounting groove near the rear end of the piston 2, and abuts against the inner surface of the housing 5, and is used to form a dustproof seal between the connecting surfaces of the piston 2 and the housing 5; the third lip corner 20 and the fourth lip corner 21 are respectively located at the front upper corner and the front lower corner of the outer sealing ring mounting groove away from the rear end of the piston 2, and are used to form a gas flow seal between the connecting surfaces of the piston 2 and the housing 5.

[0040] like Figure 5 As shown, during the clutch engagement process, the clutch pushes the release bearing 12 and the piston 2 to move axially forward. At this time, the volume of the first cavity 23 formed between the inner dust cover 8, the piston 2 and the release bearing 12 gradually increases, and the volume of the second cavity 24 formed between the outer dust cover 1, the piston 2 and the housing 5 gradually decreases. The first cavity 23 is inhaled through the outside, and the second cavity 24 discharges the gas in the cavity. The piston 2 is provided with a plurality of inlet / exhaust grooves 22 for exhaust and intake to prevent the negative pressure of the cavity from pushing the inner dust cover 8 out. The second cavity 24 is exhausted and inhaled through the felt 3, thereby completing the clutch engagement process.

[0041] like Figure 6 As shown, during the clutch separation process, the gas flow pushes the release bearing 12 and the piston 2 to move axially backward. At this time, the volume of the first cavity gradually decreases, and the volume of the second cavity gradually increases. The first cavity is exhausted through multiple inlet / exhaust grooves 22, and the second cavity inhales air to the outside through the felt 3, thereby completing the clutch separation process.

[0042] During the process of clutch engagement or disengagement, the outer sealing assembly arranged between the piston 2 and the housing 5, and the inner sealing assembly arranged between the piston 2 and the release bearing 12 and the pipe sleeve 6 can effectively seal each cavity, prevent metal chips or other impurities from entering the cavity, and effectively ensure the cleanliness of each component in the cavity.

Claims

1. A clutch actuator with sealing and dustproof function, comprising a pipe sleeve (6) sleeved on a shaft of a transmission, a piston (2) and a housing (5) sleeved on the pipe sleeve (6), a front end of the piston (2) installed in the housing (5), and a rear end connected to a release bearing (12) through a wave spring clip (13); characterized in that: An outer sealing component is provided between the piston (2) and the housing (5), and an inner sealing component is provided between the piston (2) and the release bearing (12) and the pipe sleeve (6); The outer sealing assembly comprises an outer dust cover (1), a felt (3) and an outer sealing ring (4); a boss is arranged on the outer side of one end of the outer dust cover (1); a mounting groove is arranged on the piston (2); the outer dust cover (1) is clamped with the mounting groove on the piston (2) through the boss, and the piston (2) can drive the outer dust cover (1) to move axially; a felt mounting groove is arranged on the inner side of the other end of the outer dust cover (1); the felt (3) is installed in the felt mounting groove; the inner side of the felt (3) contacts the outer surface of the housing (5) to form a seal between the piston (2) and the outer surface of the housing (5); the piston (2) forms a seal with the inner surface of the housing (5) through the outer sealing ring (4); The inner sealing assembly comprises an inner dust cover (8), an O-ring (10) and an inner sealing ring (7). The rear end of the inner dust cover (8) is connected to the pipe sleeve (6), and the front end is arranged between the connection surface of the release bearing (12) and the piston (2). The front end of the inner dust cover (8) is provided with an annular groove protrusion (14) and a plurality of sealing protrusions (15). The annular groove protrusion (14) is used to cooperate with the annular groove (16) on the piston (2) and is connected along the release bearing (12) to the inner sealing ring (7). The plurality of sealing protrusions (15) are located on the outer peripheral surface of the front end of the inner dust cover (8) and are respectively adapted to be installed with the plurality of sealing grooves (17) on the piston (2) to form a seal between the piston (2) and the release bearing (12); the O-ring (10) and the inner sealing ring (7) are arranged on the connection surface between the piston (2) and the pipe sleeve (6) to form a seal between the connection surface between the piston (2) and the pipe sleeve (6).

2. A clutch actuator with sealing and dustproof function according to claim 1, characterized in that: The front end of the piston (2) is provided with an outer sealing ring installation groove, the outer sealing ring (4) is installed in the outer sealing ring installation groove, and the outer side of the outer sealing ring (4) abuts against the inner surface of the housing (5) to form a seal between the piston (2) and the inner surface of the housing (5).

3. A clutch actuator with sealing and dustproof function according to claim 2, characterized in that: An O-ring mounting groove for mounting an O-ring (10) and an inner sealing ring mounting groove for mounting an inner sealing ring (7) are provided on the connection surface between the piston (2) and the pipe sleeve (6); the O-ring (10) fixes the O-ring fixing ring (9) on the pipe sleeve (6) by interference fit, so as to form a first seal between the connection surfaces of the piston (2) and the pipe sleeve (6); The inner sealing ring (7) is installed in the inner sealing ring installation groove and is used to form a second seal between the connecting surface of the piston (2) and the pipe sleeve (6).

4. A clutch actuator with sealing and dustproof function according to claim 3, characterized in that: A retaining ring (11) is provided at the rear end of the inner dust cover (8), and the inner dust cover (8) is fixed on the pipe sleeve (6) by interference fit through the retaining ring (11), and the release bearing (12) drives the front end of the inner dust cover (8) to move axially.

5. A clutch actuator with sealing and dustproof function according to claim 4, characterized in that: The inner sealing ring (7) and the outer sealing ring (4) are both lip sealing rings; The cross-sectional structure of the lip seal ring is Z-shaped, and comprises a first lip angle (18), a second lip angle (19), a third lip angle (20) and a fourth lip angle (21) which are sequentially arranged along the outer periphery of the cross-sectional structure and are used to abut against different corners of the inner seal ring installation groove or the outer seal ring installation groove to form different forms of seals.

6. The clutch actuator with sealing and dustproof function according to claim 5, characterized in that: The first lip angle (18) on the inner sealing ring (7) is located at the upper rear corner of the inner sealing ring installation groove close to the rear end of the piston (2), and is used to form a support between the connecting surface of the piston (2) and the pipe sleeve (6); the second lip angle (19) is located at the lower rear corner of the inner sealing ring installation groove close to the rear end of the piston (2), and is used to form a dustproof seal between the connecting surface of the piston (2) and the pipe sleeve (6); the third lip angle (20) and the fourth lip angle (21) are respectively located at the upper front corner and the lower front corner of the inner sealing ring installation groove away from the rear end of the piston (2), and are used to form a gas flow seal between the connecting surface of the piston (2) and the pipe sleeve (6).

7. A clutch actuator with sealing and dustproof function according to claim 6, characterized in that: The first lip angle (18) on the outer sealing ring (4) is located at the rear lower corner of the outer sealing ring installation groove close to the rear end of the piston (2), and is used to form a support between the piston (2) and the housing (5); the second lip angle (19) is located at the rear upper corner of the outer sealing ring installation groove close to the rear end of the piston (2), and abuts against the inner surface of the housing (5), and is used to form a dustproof seal between the connecting surface of the piston (2) and the housing (5); the third lip angle (20) and the fourth lip angle (21) are respectively located at the front upper corner and the front lower corner of the outer sealing ring installation groove away from the rear end of the piston (2), and are used to form a gas flow seal between the connecting surface of the piston (2) and the housing (5).

8. The clutch actuator with sealing and dustproof function according to claim 7, characterized in that: The O-ring fixing ring (9) and the pipe sleeve (6), as well as the rear end of the inner dust cover (8) and the pipe sleeve (6) are both interference fitted.

9. The clutch actuator with sealing and dustproof function according to claim 7, characterized in that: The distribution positions and number of the plurality of sealing protrusions (15) are the same as the distribution positions and number of the sealing grooves (17).

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