Modular AMT clutch actuator push rod connecting structure

Abstract

The utility model relates to a clutch, in particular to a modularized AMT clutch actuator push rod connecting structure which solves the technical problems that if only the length is shortened for matching, a dust cover is disengaged from a clamping groove in a limit compression state, and even the displacement stroke of a push rod is affected. According to the modularized AMT clutch actuator push rod connecting structure, the two ends of the push rod are connected with the speed changer separation shifting fork and the piston of the actuator air cylinder respectively, the push rod is responsible for smoothly transmitting thrust of the actuator air cylinder to the speed changer separation shifting fork to conduct separation operation of a clutch, and the dust cover is arranged on the push rod in a sleeving mode. One end of the dustproof cover is connected with a shell of the actuator air cylinder, the other end of the dustproof cover is in sliding fit with the push rod, the dustproof cover is not connected with the push rod in a clamping groove mode, and when the push rod moves, the dustproof cover can slide relatively without limitation on the stroke of the push rod.

Description

Technical Field

[0001] The utility model relates to a clutch, in particular to a modular AMT clutch actuator push rod connection structure. Background Art

[0002] In recent years, AMT transmissions have developed rapidly in the domestic commercial vehicle field, and many vehicle manufacturers and suppliers have successively invested in the research and development and production of AMT automatic vehicles. Currently, AMT transmissions are mainly divided into integrated type and modular type. The integrated type integrates the shift actuator, solenoid valve, TCU, sensors, etc. This way can reduce the failure rate, but at the same time there is a problem of high maintenance cost. The modular type, that is, the external type, arranges components such as the shift actuator, clutch actuator, sensors, and TCU outside the transmission. The modular type has low production and manufacturing costs and low maintenance costs, and damaged components can be replaced separately, but the failure rate is relatively high.

[0003] At present, the push rod of the clutch actuator used in the modular transmission in the commercial vehicle market is modified from the push rod matched by the initial clutch actuator. For example, a disclosed external clutch actuator in the Chinese utility model patent with the publication number of CN220037290U includes: a cylinder block assembly, which can be selectively fixed outside the transmission; and a push rod, one end of which is connected to the clutch release fork, and the other end is arranged inside the cylinder block assembly; a piston, which is movably arranged inside the cylinder block assembly, and the piston is connected to the other end of the push rod; a cylinder valve group, which is communicated with the cylinder block assembly and used to push the piston to move, and one end of the dust cover is fixed outside the front cylinder block, and the dust cover is sleeved outside one end of the push rod.

[0004] The push rod connection structure in the above actuator is typically modified from the push rod matched by the initial clutch actuator. Now, the requirements of each vehicle manufacturer are different. Some manufacturers require a very short push rod. If only shortening the length of the initial push rod structure for matching, the following problems will occur: First, the existing push rod is connected to the dust cover through the card slot on the push rod. If the push rod is too short, the dust cover will be disengaged from the card slot on the push rod in the extreme compression state; Second, because the dust cover has a certain limiting effect on the push rod in the extreme compression state, if only shortening the length of the push rod, it may cause the actual displacement stroke of the clutch actuator not to reach the designed stroke, and in severe cases, it may even shorten the service stroke of the clutch driven disc and reduce the service life of the clutch. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the technical problem that if the existing push rod structure only shortens the length for matching, it will cause the dust cover to be disengaged from the card slot in the extreme compression state and even affect the displacement stroke of the push rod, and to provide a modular AMT clutch actuator push rod connection structure.

[0006] To achieve the above object, the present utility model provides the following technical solutions:

[0007] A modular AMT clutch actuator push rod connection structure, characterized in that:

[0008] It includes a push rod, a dust cover and an actuator cylinder;

[0009] One end of the push rod is used to connect with the transmission release fork, and the other end is used to connect with the piston of the actuator cylinder;

[0010] The dust cover is sleeved on the push rod, one end of the dust cover is connected to the outer shell of the actuator cylinder, and the other end is in sliding fit with the push rod.

[0011] Further, the push rod includes a ball head provided at one end connected to the transmission release fork and a hemispherical head provided at the other end connected to the piston;

[0012] An installation groove for cooperating with the hemispherical head is formed on the piston, and the hemispherical head is clamped in the installation groove;

[0013] The ball head is used for mating connection with the ball socket on the transmission release fork.

[0014] Further, the hemispherical head is connected to the push rod through a connecting shaft, and the shaft diameter of the connecting shaft is smaller than the diameter of the hemispherical head. A snap ring groove is circumferentially provided on the inner wall of the installation groove corresponding to the position of the connecting shaft, and a snap ring is provided in the snap ring groove; the snap ring includes an annular body and a plurality of teeth evenly distributed along the circumferential direction on the inner circle edge of the annular body. The annular body is located in the snap ring groove, and the teeth are bent towards the bottom of the installation groove and abut against the inner end surface of the hemispherical head, and the hemispherical head is clamped in the installation groove through the snap ring.

[0015] Further, one end of the dust cover connected to the outer shell is provided with a snap ring, and a clamping groove is circumferentially formed on the outer peripheral surface of the snap ring, and the opening of the outer shell is clamped in the clamping groove.

[0016] Further, one end of the dust cover in sliding fit with the push rod is provided with a sealing necking.

[0017] Further, the outer wall of the push rod is plated with chromium.

[0018] Compared with the prior art, the beneficial effects of the present utility model are:

[0019] (1) The push rod of a modular AMT clutch actuator push rod connection structure provided by the present utility model is respectively connected to the transmission release fork and the piston of the actuator cylinder at both ends, and is responsible for smoothly transmitting the thrust of the actuator cylinder to the transmission release fork to perform the clutch disengagement operation. The dust cover is sleeved on the push rod. One end of the dust cover is connected to the outer shell of the actuator cylinder, and the other end is in sliding fit with the push rod. The dust cover is not connected to the push rod in a slot form. When the push rod moves, the dust cover can slide relatively, and there is no limit to the push rod stroke.

[0020] (2) In a modular AMT clutch actuator push rod connection structure provided by the present utility model, the dust cover does not need to meet the displacement of the full extension and retraction of the push rod. Then, the designed length of the push rod can exceed the limit of the longest extension range of the dust cover, and there is also no limit to the push rod stroke due to the limit of the ultimate compression thickness of the dust cover. In this way, the upper and lower limits of the designed length of the push rod can be improved.

[0021] (3) In a modular AMT clutch actuator push rod connection structure provided by the present utility model, there is no need to process slots on the surface of the push rod, saving processing time and cost. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of an embodiment of a modular AMT clutch actuator push rod connection structure of the present utility model;

[0023] Figure 2 is a schematic structural diagram of the push rod in the embodiment of the present utility model.

[0024] The reference numerals are explained as follows:

[0025] 1 - Push rod, 11 - Ball head, 12 - Hemispherical head, 13 - Connecting shaft; 2 - Dust cover, 21 - Snap ring, 22 - Sealing mouth; 3 - Actuator cylinder, 31 - Outer shell, 32 - Piston; 4 - Snap ring, 41 - Ring-shaped body, 42 - Teeth. Detailed Embodiment

[0026] The present utility model will be further described below in conjunction with the drawings and specific embodiments.

[0027] Referring to Figure 1 - Figure 2 , a modular AMT clutch actuator push rod connection structure of the present utility model includes a push rod 1, a dust cover 2, and an actuator cylinder 3. The structure of the push rod 1 is as Figure 2 shown. The push rod 1 includes a hemispherical head 12 provided at one end and a ball head 11 provided at the other end. The ball head 11 is used to cooperate with the ball socket on the transmission release fork, and the hemispherical head 12 is used to connect with the piston 32 of the actuator cylinder 3.

[0028] As Figure 1As shown in the figure, an installation groove for cooperating with the hemispherical head 12 is formed on the piston 32. In order to realize the connection between the hemispherical head 12 and the piston 32, the hemispherical head 12 and the push rod 1 are connected by a connecting shaft 13, and the shaft diameter of the connecting shaft 13 is smaller than the diameter of the hemispherical head 12. In this way, an annular abutting surface is formed on the inner end surface of the hemispherical head 2. Therefore, a snap ring groove is circumferentially formed on the inner wall of the installation groove corresponding to the position of the connecting shaft 13. A snap ring 4 is arranged in the snap ring groove. In order to facilitate the insertion of the hemispherical head 12 into the installation groove, the snap ring 4 includes an annular body 41 located in the snap ring groove and a plurality of teeth 42 uniformly arranged along the circumferential direction on the inner circle edge of the annular body 41. All the teeth 42 are bent towards the bottom of the installation groove and abut against the inner end surface of the hemispherical head 12. In this way, the hemispherical head 12 is clamped in the installation groove by the snap ring 4.

[0029] In this way, the push rod 1 connects the transmission release fork and the actuator cylinder 3 together. The thrust of the piston of the actuator cylinder 3 can be smoothly transmitted to the transmission release fork to perform the clutch release operation.

[0030] The dust cover 2 is sleeved on the push rod 1. One end of the dust cover 2 is connected to the outer shell 31 of the actuator cylinder 3, and the other end is slidably matched with the push rod 1. In order to realize the connection between the dust cover 2 and the outer shell of the actuator cylinder 3, a snap ring 21 is arranged at one end of the dust cover 2 connected to the outer shell 31. A clamping groove is circumferentially formed on the outer peripheral surface of the snap ring 21, and the opening of the outer shell 31 is clamped in the clamping groove. And one end of the dust cover 2 slidably matched with the push rod 1 is provided with a sealing mouth 22, which further improves the sealing performance. The dust cover 2 with this connection structure can slide relative to each other when the push rod 1 moves, and there is no limit to the stroke of the push rod 1.

[0031] In order to ensure that the surface of the push rod 1 will not be worn due to the relative sliding between the push rod 1 and the dust cover 2, chromium is plated on the entire surface of the push rod 1, which can not only increase the surface hardness but also prevent rust. The entire push rod 1 is forged and processed, and is quenched and tempered after forging to ensure the overall strength. Because the ball head 11 needs to cooperate with the ball socket on the transmission release fork and its strength is crucial, the ball head 11 is quenched and polished to ensure its strength. The push rod 1 slidably matched with the dust cover 2 needs to meet the requirements of smooth sliding and will not cause excessive wear to the sealing mouth 22, so it is also polished.

[0032] The above-described embodiments are only descriptions of the specific implementation manners of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A modular AMT clutch actuator push rod connection structure, characterized in that: It includes a push rod (1), a dust cover (2) and an actuator cylinder (3); One end of the push rod (1) is used to connect with the transmission release fork, and the other end is used to connect with the piston (32) of the actuator cylinder (3); The dust cover (2) is sleeved on the push rod (1), one end of the dust cover (2) is connected to the outer shell (31) of the actuator cylinder (3), and the other end is in sliding fit with the push rod (1).

2. The modular AMT clutch actuator push rod connection structure according to claim 1, characterized in that: The push rod (1) includes a ball head (11) provided at one end connected to the transmission release fork and a hemispherical head (12) provided at the other end connected to the piston (32); An installation groove for cooperating with the hemispherical head (12) is formed on the piston (32), and the hemispherical head (12) is snap-fitted in the installation groove; The ball head (11) is used for cooperating connection with the ball socket on the transmission release fork.

3. The modular AMT clutch actuator push rod connection structure according to claim 2, characterized in that: The hemispherical head (12) is connected to the push rod (1) through a connecting shaft (13), and the shaft diameter of the connecting shaft (13) is smaller than the diameter of the hemispherical head (12). A snap ring groove is circumferentially arranged on the inner wall of the installation groove corresponding to the position of the connecting shaft (13), and a snap ring (4) is arranged in the snap ring groove; The snap ring (4) includes an annular body (41) and a plurality of teeth (42) evenly distributed along the circumferential direction on the inner circle edge of the annular body (41). The annular body (41) is located in the snap ring groove, and the teeth (42) are bent towards the bottom of the installation groove and abut against the inner end face of the hemispherical head (12), and the hemispherical head (12) is snap-fitted in the installation groove through the snap ring (4).

4. The modular AMT clutch actuator push rod connection structure according to claim 2, characterized in that: One end of the dust cover (2) connected to the outer shell (31) is provided with a snap ring (21), and a card slot is circumferentially formed on the outer peripheral surface of the snap ring (21), and the opening of the outer shell (31) is snap-fitted in the card slot.

5. The modular AMT clutch actuator push rod connection structure according to claim 4, characterized in that: One end of the dust cover (2) in sliding fit with the push rod (1) is provided with a sealing collar (22).

6. The modular AMT clutch actuator push rod connection structure according to claim 5, characterized in that: The outer wall of the push rod (1) is plated with chromium.

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