Lead screw limiting structure of AMT clutch executing mechanism

Abstract

A lead screw limiting structure of an AMT clutch executing mechanism is installed in a shell of the clutch executing mechanism and comprises a lead screw with the front end connected with a clutch master cylinder of a clutch and a nut assembled on the lead screw and driven by a gear to rotate. A limiting sleeve assembly capable of elastically stretching out and drawing back is installed on the clutch executing mechanism shell, an anti-rotation groove is formed in the limiting base in the axial direction, the limiting sleeve assembly stretches into the anti-rotation groove to position the limiting base in the circumferential direction, and a semispherical positioning blind hole for positioning retreating of the lead screw is formed in the anti-rotation groove. The limiting sleeve assembly extends into the semispherical positioning blind hole along with retreating of the lead screw. The clutch master cylinder prevents the lead screw from rotating and ensures that the lead screw can only move in the axial direction, and the movement reliability of the clutch master cylinder is improved; the positioning of the retreating position of the lead screw is formed, the structural reliability and the execution efficiency of the AMT clutch execution mechanism are improved, and the timeliness and the effectiveness of separation or connection of the clutch are guaranteed.

Description

Technical Field

[0001] The utility model relates to a lead screw limiting structure of an AMT clutch actuator, belonging to the technical field of automatic transmissions. Background Art

[0002] The AMT transmission is improved on the basis of the traditional manual gear transmission; the AMT not only has the advantages of automatic shifting of the hydraulic automatic transmission, but also retains the advantages of high efficiency, low cost, simple structure and easy manufacturing of the original manual transmission gear drive. At present, the domestic commercial vehicle market is gradually pursuing higher driving comfort, and the demand for commercial vehicle AMTs is accelerating, and the market is gradually turning into a rigid demand. The ball screw pair is more and more widely used in AMT transmissions. Generally, in the clutch mechanism, the nut of the ball screw pair rotates, and the lead screw makes a reciprocating linear motion and pushes the clutch master cylinder to establish clutch oil pressure, and finally realizes the separation or engagement of the clutch. However, the ball screw pair has the following problems in actual use:

[0003] 1. When the lead screw makes a reciprocating linear motion, it will be accompanied by a rotational motion, which affects the reliability of the movement of the clutch master cylinder;

[0004] 2. After each clutch engagement, the lead screw cannot retreat to the accurate position. If the lead screw does not retreat far enough, the clutch master cylinder cannot replenish oil normally, which ultimately affects the pressure build-up of the master cylinder. If the lead screw retreats too much, there will be an idle stroke, which affects the response speed of the mechanism. Summary of the Utility Model

[0005] The lead screw limiting structure of the AMT clutch actuator provided by the utility model prevents the lead screw from rotating, ensures that the lead screw can only move axially, and improves the movement reliability of the clutch master cylinder; forms a positioning of the retreat position of the lead screw. When the lead screw advances, the AMT clutch actuator responds in time to ensure the response speed of the mechanism. When the lead screw retreats, the retreat displacement is accurate, ensuring normal oil replenishment of the clutch master cylinder, improving the structural reliability and execution efficiency of the AMT clutch actuator, and ensuring the timeliness and effectiveness of clutch separation or engagement.

[0006] To achieve the above object, the technical solution adopted by the utility model is:

[0007] The lead screw limiting structure of the AMT clutch actuator is installed in the clutch actuator housing, and includes a lead screw with the front end connected to the clutch master cylinder of the clutch, and a nut assembled on the lead screw and driven to rotate by a gear. The characteristics are as follows: a limiting seat is coaxially fixed at the rear end of the lead screw, an elastic telescopic limiting sleeve assembly is installed on the clutch actuator housing, an anti-rotation groove is axially opened on the limiting seat, the limiting sleeve assembly extends into the anti-rotation groove to form a circumferential positioning of the limiting seat, a hemispherical positioning blind hole for positioning the retreat of the lead screw is opened in the anti-rotation groove, and the limiting sleeve assembly extends into the hemispherical positioning blind hole as the lead screw retreats.

[0008] Preferably, the anti-rotation groove is a U-shaped groove with a U-shaped cross-section. The limit sleeve assembly includes a limit sleeve installed in the clutch actuator housing. The limit sleeve is arranged radially along the lead screw, and its lower end extends into the anti-rotation groove and contacts the inner side wall of the anti-rotation groove.

[0009] Preferably, a ejector rod corresponding to the hemispherical positioning blind hole and a spring pressing on the ejector rod are installed in the limit sleeve. A bolt head for pressing the spring in the limit sleeve is installed in the clutch actuator housing. The lower end of the ejector rod extends out of the limit sleeve, and the lower end of the ejector rod extends into the hemispherical positioning blind hole as the lead screw retracts.

[0010] Preferably, the lower end surface of the ejector rod is a spherical surface corresponding to the hemispherical positioning blind hole, and the hemispherical positioning blind hole is opened on the bottom surface of the anti-rotation groove.

[0011] Preferably, the ejector rod is T-shaped, and the inner cavity of the limit sleeve is a T-shaped cavity matching the ejector rod.

[0012] The beneficial effects of the present utility model are as follows:

[0013] For the lead screw limit structure of the AMT clutch actuator of the present utility model, a limit seat is fixed at the rear end of the lead screw, and an elastically telescopic limit sleeve assembly is installed on the clutch actuator housing. The limit sleeve assembly extends into the anti-rotation groove to form circumferential positioning of the limit seat, so that the lead screw will not rotate with the rotation of the nut, preventing the lead screw from rotating, ensuring that the lead screw can only move axially, and improving the movement reliability of the clutch master cylinder; the limit sleeve assembly extends into the hemispherical positioning blind hole as the lead screw retracts, forming positioning of the retraction position of the lead screw, avoiding the lead screw not retracting in place or retracting too much, ensuring the displacement accuracy of the lead screw retraction. When the lead screw advances, the AMT clutch actuator responds in a timely manner, ensuring the response speed of the mechanism. When the lead screw retracts, the retraction displacement is accurate, ensuring normal oil replenishment of the clutch master cylinder, improving the structural reliability and execution efficiency of the AMT clutch actuator, and ensuring the timeliness and effectiveness of clutch separation or engagement. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the lead screw limit structure of the AMT clutch actuator in the specific embodiment.

[0015] Figure 2 It is Figure 1 a side cross-sectional view of Specific Embodiment

[0016] The following Figures 1-2 will describe the embodiments of the present utility model in detail.

[0017] The screw rod limit structure of the AMT clutch actuator is installed in the clutch actuator housing and includes a screw rod 1 with its front end connected to the clutch master cylinder 100 of the clutch, and a nut 2 assembled on the screw rod 1 and driven to rotate by a gear. It is characterized in that: a limit seat 3 is coaxially fixed to the rear end of the screw rod 1, an elastically telescopic limit sleeve assembly 4 is installed on the clutch actuator housing, an anti-rotation groove 5 is axially formed on the limit seat 3, the limit sleeve assembly 4 extends into the anti-rotation groove 5 to form circumferential positioning of the limit seat 3, a hemispherical positioning blind hole 6 for positioning the backward movement of the screw rod is formed in the anti-rotation groove 5, and the limit sleeve assembly 4 extends into the hemispherical positioning blind hole 6 as the screw rod 1 moves backward.

[0018] For the screw rod limit structure of the AMT clutch actuator described above, the limit seat 3 is fixed to the rear end of the screw rod 1, the elastically telescopic limit sleeve assembly 4 is installed on the clutch actuator housing, and the limit sleeve assembly 4 extends into the anti-rotation groove 5 to form circumferential positioning of the limit seat 3, so that the screw rod 1 will not rotate with the rotation of the nut 2, preventing the screw rod 1 from rotating, ensuring that the screw rod 1 can only move axially, and improving the movement reliability of the clutch master cylinder; the limit sleeve assembly 4 extends into the hemispherical positioning blind hole 6 as the screw rod 1 moves backward, forming positioning of the backward position of the screw rod 1, avoiding the screw rod 1 from not reaching the backward position or moving backward too much, ensuring the displacement accuracy of the screw rod 1 when it moves backward, enabling the AMT clutch actuator to respond in a timely manner when the screw rod 1 moves forward, ensuring the response speed of the mechanism, and ensuring accurate backward displacement when the screw rod moves backward, ensuring normal oil replenishment of the clutch master cylinder, improving the structural reliability and execution efficiency of the AMT clutch actuator, and ensuring the timeliness and effectiveness of clutch separation or engagement.

[0019] Among them, the anti-rotation groove 5 is a U-shaped groove with a U-shaped cross-section. The limit sleeve assembly 4 includes a limit sleeve 41 installed in the clutch actuator housing. The limit sleeve 41 is arranged radially along the screw rod 1, and its lower end extends into the anti-rotation groove 5 and contacts the inner side wall of the anti-rotation groove 5. The contact between the limit sleeve 41 and the inner side wall of the anti-rotation groove 5 performs circumferential positioning of the limit seat 3, making the limit seat 3 unable to rotate, thereby forming circumferential positioning of the screw rod 1, so that the screw rod 1 will not rotate with the rotation of the nut 2.

[0020] Among them, a push rod 42 corresponding to the hemispherical positioning blind hole 6 and a spring 43 pressing on the push rod 42 are installed in the limit sleeve 41. A bolt head 44 for pressing the spring 43 in the limit sleeve 41 is installed in the clutch actuator housing. The lower end of the push rod 42 extends out of the limit sleeve 41, and the lower end of the push rod extends into the hemispherical positioning blind hole 6 as the lead screw 1 retracts. The push rod 42 is pressed downward by the spring 43, so that its lower end extends out of the limit sleeve 41. When the lead screw 1 retracts until the lower end of the push rod is aligned with the hemispherical positioning blind hole 6, the lower end of the push rod will extend into the hemispherical positioning blind hole 6 under the push of the spring 43 to position the lead screw 1 and prevent the lead screw 1 from retracting further. At this time, the lead screw 1 retracts in place, and the clutch actuator controls the nut 2 to stop rotating. The cooperation between the push rod 42 and the hemispherical positioning blind hole 6 ensures that the lead screw 1 retracts in place, and the accuracy of the retraction displacement is high. When the lead screw needs to move forward again, the nut 2 rotates to drive the lead screw 1 to move forward. When the lead screw 1 moves forward, it pushes the lower end of the push rod to move upward and separate from the hemispherical positioning blind hole 6.

[0021] Among them, the lower end face of the push rod 42 is a spherical surface corresponding to the hemispherical positioning blind hole 6, and the hemispherical positioning blind hole 6 is opened on the bottom surface of the anti-rotation groove 5. When the lower end of the push rod is aligned with the hemispherical positioning blind hole 6, a spherical surface mating positioning is formed, which can not only position the retraction of the lead screw 1, but also facilitate the up and down elastic floating of the push rod 42 in the limit sleeve without interfering with the movement of the lead screw 1.

[0022] Among them, the push rod 42 is T-shaped, and the inner cavity of the limit sleeve 41 is a T-shaped cavity matching the push rod 42. When the push rod 42 abuts against the inner cavity of the limit sleeve 41, the lower end of the push rod 42 can no longer extend downward, forming a limit on the length of the lower end of the push rod extending out of the limit sleeve, ensuring that the lower end of the push rod can extend into the hemispherical positioning blind hole 6 when the lead screw retracts, and will not exert too much radial pressure on the lead screw and will not interfere with the forward movement of the lead screw.

[0023] The technical solutions of the embodiments of the present invention are completely described above in conjunction with the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

Claims

1. The lead screw limit structure of the AMT clutch actuator is installed in the clutch actuator housing and includes a lead screw with its front end connected to the master cylinder of the clutch, and a nut assembled on the lead screw and driven to rotate by a gear. It is characterized in that: A limit seat is coaxially and fixedly installed at the rear end of the lead screw. An elastically telescopic limit sleeve assembly is installed on the clutch actuator housing. An anti-rotation groove is axially formed on the limit seat. The limit sleeve assembly extends into the anti-rotation groove to form circumferential positioning of the limit seat. A hemispherical positioning blind hole for positioning the backward movement of the lead screw is formed in the anti-rotation groove. The limit sleeve assembly extends into the hemispherical positioning blind hole as the lead screw moves backward.

2. The lead screw limit structure of the AMT clutch actuator according to claim 1, characterized in that: The anti-rotation groove is a U-shaped groove with a U-shaped cross-section. The limit sleeve assembly includes a limit sleeve installed in the clutch actuator housing. The limit sleeve is arranged radially along the lead screw, and the lower end extends into the anti-rotation groove and contacts the inner side wall of the anti-rotation groove.

3. The lead screw limit structure of the AMT clutch actuator according to claim 2, wherein: A push rod corresponding to the hemispherical positioning blind hole and a spring pressing on the push rod are installed in the limit sleeve. A bolt head for pressing the spring in the limit sleeve is installed in the clutch actuator housing. The lower end of the push rod extends out of the limit sleeve, and the lower end of the push rod extends into the hemispherical positioning blind hole as the lead screw moves backward.

4. The screw rod limit structure of the AMT clutch actuator according to claim 3, characterized in that: The lower end face of the push rod is a spherical surface corresponding to the hemispherical positioning blind hole, and the hemispherical positioning blind hole is formed on the bottom surface of the anti-rotation groove.

5. The lead screw limit structure of the AMT clutch actuator according to claim 3, characterized in that: The push rod is T-shaped, and the inner cavity of the limit sleeve is a T-shaped cavity matching the push rod.

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