High-reliability separation system of light truck AMT gearbox

Abstract

The utility model discloses a light truck AMT gearbox high-reliability separation system which comprises an input shaft end cover, a maintenance-free separation bearing, an integrated separation shifting fork, a supporting rod polyamide wear-resisting spherical lining, an ejector rod polyamide wear-resisting spherical lining, a separation shifting fork supporting rod, a gearbox front shell, an AMT pneumatic booster cylinder and an AMT pneumatic booster cylinder push rod. An input shaft end cover is arranged on the gearbox front shell, a separation shifting fork supporting rod is arranged at the upper end of the input shaft end cover, and an AMT pneumatic booster cylinder is arranged at the lower end of the input shaft end cover; the input shaft end cover is sleeved with the maintenance-free release bearing, and the two sides of the maintenance-free release bearing are matched with the crotch of the integrated release shifting fork; a supporting rod polyamide wear-resisting spherical bush and an ejector rod polyamide wear-resisting spherical bush are arranged at the two ends of the integrated release fork, a ball socket of the supporting rod polyamide wear-resisting spherical bush is matched with a ball head of a supporting rod of the release fork, and a ball socket of the ejector rod polyamide wear-resisting spherical bush is matched with a ball head of a push rod of the AMT pneumatic booster cylinder. According to the utility model, the driving comfort is improved, and the assembly and maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to a high-reliability separation system suitable for an AMT gearbox of a light truck, belonging to the technical field of gearboxes. Background Art

[0002] As the pursuit of driving comfort for light trucks continues to improve, the transmission of light trucks is also developing towards AMT technology. However, at present, light truck AMT transmissions have problems such as large deformation of the separation system, easy wear of separation system parts and affecting driving experience, and high maintenance costs after wear of separation system parts. Therefore, the high reliability separation system of light truck AMT transmissions will become the future development trend. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a light truck AMT gearbox high-reliability separation system in view of the defects in the prior art, thereby improving driving comfort and reducing maintenance costs.

[0004] In order to solve this technical problem, the utility model provides a light truck AMT gearbox high reliability release system, including an input shaft end cover, a maintenance-free release bearing, an integrated release fork, a support rod polyamide wear-resistant ball bushing, a push rod polyamide wear-resistant ball bushing, a release fork support rod, a gearbox front housing, an AMT pneumatic booster cylinder and an AMT pneumatic booster cylinder push rod. The input shaft end cover is installed on the gearbox front housing through the oil pump housing, the release fork support rod is installed on the upper end of the input shaft end cover, the AMT pneumatic booster cylinder is installed on the lower end of the input shaft end cover, and the maintenance-free release bearing is sleeved on the input shaft. The shaft end cover and the input shaft end cover are matched with a large clearance; the two sides of the maintenance-free release bearing are matched with the side surfaces of the crotch of the integrated release fork, the axial front end is in constant contact with the clutch release finger, and the axial rear end is in constant contact with the arc surface of the integrated release fork; the upper and lower ends of the integrated release fork are respectively equipped with a support rod polyamide wear-resistant spherical bushing and a push rod polyamide wear-resistant spherical bushing, the ball socket of the support rod polyamide wear-resistant spherical bushing is matched with the ball head of the release fork support rod, and the ball socket of the push rod polyamide wear-resistant spherical bushing is matched with the ball head of the AMT pneumatic power-assisted cylinder push rod, and the three constitute a lever structure.

[0005] The support rod polyamide wear-resistant spherical bushing and the push rod polyamide wear-resistant spherical bushing are installed with the integrated separation fork by adopting transition fit.

[0006] The one-piece release fork is an integral structure, which is processed by a forging machine and has an arched beam frame rib structure. The contact surface between the one-piece release fork and the maintenance-free release bearing is designed in an arc shape.

[0007] The maintenance-free release bearing is embedded with engineered wear-resistant nylon material.

[0008] The input shaft end cover is positioned with the oil pump housing assembly through the stopper, and the oil pump housing is installed on the front housing of the gearbox, thereby indirectly positioning the input shaft end cover and the front housing of the gearbox, and fixing and clamping the input shaft end cover through bolts.

[0009] The front housing of the gearbox adopts an integrated design, with the pneumatic booster cylinder bracket integrated on the front housing of the gearbox at the lower end, and the AMT pneumatic booster cylinder directly connected to the front housing of the gearbox through bolts; the interface of the release fork support rod is integrated on the front housing of the gearbox at the upper end, and the rear end of the release fork support rod is provided with a thread, which is directly threadedly connected to the front housing of the gearbox.

[0010] The matching interface between the front housing of the gearbox and the clutch assembly adopts a standardized design to achieve the adaptation of various types of clutches under the same standard.

[0011] Beneficial effects: The high-reliability separation system of the transmission of the utility model has a compact structure. While improving driving comfort, it can achieve many advantages such as improved overall structural rigidity, reduced waste generation, reduced assembly costs, and reduced later maintenance costs. At the same time, the mileage intervals required for maintenance are also increased, meeting the maintenance cost requirements of the commercial vehicle market. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structural section of the utility model;

[0013] Figure 2 It is the installation diagram of the utility model.

[0014] In the figure: 1. Support rod polyamide wear-resistant ball bushing; 2. Release fork support rod; 3. Transmission front housing; 4. Push rod polyamide wear-resistant ball bushing; 5. AMT pneumatic booster cylinder push rod; 6. AMT pneumatic booster cylinder; 7. Integrated release fork; 8. Maintenance-free release bearing; 9. Input shaft end cover. DETAILED DESCRIPTION

[0015] The utility model is described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] like Figure 1 and Figure 2As shown, the utility model provides a high-reliability release system for a light truck AMT gearbox, including an input shaft end cover 9, a maintenance-free release bearing 8, an integrated release fork 7, a support rod polyamide wear-resistant spherical bushing 1, a push rod polyamide wear-resistant spherical bushing 4, a release fork support rod 2, a gearbox front housing 3, an AMT pneumatic booster cylinder 6 and an AMT pneumatic booster cylinder push rod 5. The input shaft end cover 9 is installed on the gearbox front housing 3 through an oil pump housing, the release fork support rod 2 is installed on the upper end of the input shaft end cover 9, and the AMT pneumatic booster cylinder 6 is installed on the lower end of the input shaft end cover 9. The maintenance-free release bearing 8 is sleeved on the input shaft end cover 9 and is matched with the input shaft end cover 9 with a large clearance to achieve radial positioning; the two sides of the maintenance-free release bearing 8 are matched with the crotch side of the integrated release fork 7 to achieve circumferential positioning, and its axial front end is separated from the clutch. Refers to constant contact cooperation, the axial rear end is in constant contact cooperation with the arc surface of the integrated separation fork 7 to achieve axial positioning; the upper and lower ends of the integrated separation fork 7 are respectively equipped with a support rod polyamide wear-resistant spherical bushing 1 and a push rod polyamide wear-resistant spherical bushing 4, which eliminates the hidden danger of jamming of the separation system due to abnormal wear of metal parts and improves product reliability; the ball socket of the support rod polyamide wear-resistant spherical bushing 1 cooperates with the ball head of the separation fork support rod 2, and its front end is provided with a self-returning clamping claw to clamp and position the front end ball head of the separation fork support rod 2; the ball socket of the push rod polyamide wear-resistant spherical bushing 4 cooperates with the ball head of the AMT pneumatic booster cylinder push rod 5, and the integrated separation fork 7 cooperates with the maintenance-free separation bearing 8 through the arc surface, and the three constitute a labor-saving lever structure, and the rear end of the AMT pneumatic booster cylinder push rod 5 is installed in the ball socket inside the AMT pneumatic booster cylinder 6.

[0017] The support rod polyamide wear-resistant spherical bushing 1 and the top rod polyamide wear-resistant spherical bushing 4 are installed with the integrated release fork 7 by transition fit.

[0018] The integrated release fork 7 changes the structure of the original separate connection between the release fork and the release fork shaft pin key, adopts an integrated lever structure design, improves the structural strength, and can be forged and machined. Its shape is an arched beam frame rib structure, which can achieve maximum rigidity with less material, reduce the deformation of the separation system, and improve reliability; the contact surface between the integrated release fork 7 and the maintenance-free release bearing 8 adopts an arc-shaped design, which makes it easier to achieve precise processing of the contact surface, thereby ensuring the accurate and smooth movement of the maintenance-free release bearing 8. At the same time, the number of parts is reduced, the assembly cost is reduced, and the reliability is improved.

[0019] The maintenance-free release bearing 8 is embedded with engineered wear-resistant nylon material, which can greatly reduce the frequency of bearing replacement, reduce the subsequent maintenance costs and waste generation, and improve the reliability of use. The maintenance-free release bearing 8 has two movement strokes. The clutch release finger is pushed forward by the AMT pneumatic booster cylinder 6 to provide power, and the clutch release finger spring is used to reset it backward. The maintenance-free release bearing 8 slides on the input shaft end cover 9 and adopts a clearance fit with the input shaft end cover 9. The embedded engineered wear-resistant nylon material can ensure the smooth sliding of the maintenance-free release bearing 8 and the input shaft end cover 9 within the operating temperature range, which can reduce maintenance costs and improve reliability. At the same time, the maintenance-free release bearing 8 can achieve automatic self-alignment within the working range.

[0020] The input shaft end cover 9 is positioned with the oil pump housing assembly through the stopper, and the oil pump housing is mounted on the gearbox front housing 3, thereby indirectly positioning the input shaft end cover 9 with the gearbox front housing 3, and fixing and clamping the input shaft end cover 9 through bolts.

[0021] The transmission front housing 3 adopts an integrated design, and the pneumatic booster cylinder bracket is integrated into the transmission front housing 3 at the lower end to improve the overall rigidity of the system and further ensure the accuracy and reliability of the system movement; the AMT pneumatic booster cylinder 6 is directly and reliably connected to the transmission front housing 3 by bolts; the interface of the release fork support rod 2 is integrated into the transmission front housing 3 at the upper end, and the rear end of the release fork support rod 2 is provided with a thread, which is directly threadedly connected to the transmission front housing 3.

[0022] The matching interface between the gearbox front housing 3 and the clutch assembly adopts a standardized design, which can achieve the adaptation of various types of clutches under the same standard.

[0023] The working principle of the utility model is as follows:

[0024] By controlling the air pressure difference in the internal cavity of the AMT pneumatic booster cylinder 6, the direction of the piston of the AMT pneumatic booster cylinder 6 is controlled, thereby pushing the AMT pneumatic booster cylinder push rod 5 to make corresponding actions.

[0025] When the clutch makes a release action request, the air pressure difference in the internal cavity of the AMT pneumatic booster cylinder 6 pushes the piston of the AMT pneumatic booster cylinder 6 to move forward, thereby pushing the AMT pneumatic booster cylinder push rod 5 to move forward synchronously, and the AMT pneumatic booster cylinder push rod 5 pushes the AMT pneumatic booster cylinder push rod 5 end of the integrated release fork 7 to move forward, and the 2 ends of the separation fork support rod of the integrated release fork 7 rotate around the ball head of the separation fork support rod 2, so that the middle arc part of the integrated release fork 7 pushes the maintenance-free release bearing 8 to make a linear motion forward along the axial direction of the input shaft end cover 9, and the front end of the maintenance-free release bearing 8 is in constant contact with the clutch release finger, so that the maintenance-free release bearing 8 pushes the clutch release finger forward. When the clutch reaches the requested position, the air pressure difference in the internal cavity of the AMT pneumatic booster cylinder 6 is controlled to achieve a balance between the spring force of the clutch release finger and the force of the AMT pneumatic booster cylinder 6 pushing the maintenance-free release bearing 8, thereby achieving corresponding clutch release position control.

[0026] When the clutch makes an engagement action request, the air pressure difference in the internal cavity of the AMT pneumatic booster cylinder 6 is controlled to ensure that the force of the MT pneumatic booster cylinder 6 pushing the maintenance-free release bearing 8 is smaller than the spring force of the clutch release finger. The clutch release finger correspondingly pushes the maintenance-free release bearing 8 backward, and the maintenance-free release bearing 8 pushes the middle arc part of the integrated release fork 7 to move backward. The 2 ends of the separation fork support rod of the integrated release fork 7 rotate around the ball head of the separation fork support rod 2, and the AMT pneumatic booster cylinder push rod 5 end of the integrated release fork 7 pushes the internal piston of the MT pneumatic booster cylinder 6 backward to make a linear motion. When the clutch reaches the requested position, the air pressure difference in the internal cavity of the AMT pneumatic booster cylinder 6 is controlled to achieve a balance between the spring force of the clutch release finger and the force of the AMT pneumatic booster cylinder 6 pushing the maintenance-free release bearing 8, thereby achieving the corresponding engagement position control of the clutch.

[0027] The utility model uses compressed air as a power source, and realizes accurate and reliable control of the mechanical action of the separation system through the AMT pneumatic booster cylinder, wherein the AMT pneumatic booster cylinder controls the air pressure of the two chambers and transmits it to the release bearing through the integrated release fork of the lever structure, thereby realizing accurate and rapid control of the position of the release bearing, thereby ensuring that the clutch can quickly realize accurate action. With the wear-resistant characteristics of the support rod polyamide wear-resistant ball bushing and the top rod polyamide wear-resistant ball bushing, the long-term reliability of the separation fork support rod and the AMT pneumatic booster cylinder push rod and the integrated separation fork in the process of rotating around the ball is realized, and the wear and failure caused by the direct cooperation movement of the separation fork support rod and the AMT pneumatic booster cylinder push rod with the integrated separation fork in the original majority of structures is eliminated; the original structure is changed from directly replacing the integrated separation fork after wear to only replacing the support rod polyamide wear-resistant ball bushing and the top rod polyamide wear-resistant ball bushing, which reduces the later maintenance cost and improves reliability.

[0028] The above embodiments of the present invention are merely illustrative and not exclusive, and all modifications within the scope of the present invention or equivalent to the scope of the present invention are encompassed by the present invention.

Claims

1. A light truck AMT transmission high reliability separation system, characterized by: The invention comprises an input shaft end cover (9), a maintenance-free release bearing (8), an integrated release fork (7), a support rod polyamide wear-resistant spherical bushing (1), a push rod polyamide wear-resistant spherical bushing (4), a release fork support rod (2), a gearbox front housing (3), an AMT pneumatic booster cylinder (6) and an AMT pneumatic booster cylinder push rod (5), wherein the input shaft end cover (9) is mounted on the gearbox front housing (3) through an oil pump housing, the release fork support rod (2) is mounted on the upper end of the input shaft end cover (9), the AMT pneumatic booster cylinder (6) is mounted on the lower end of the input shaft end cover (9), the maintenance-free release bearing (8) is sleeved on the input shaft end cover (9) and is connected to the input shaft end The cover (9) is matched with a large clearance; the two sides of the maintenance-free release bearing (8) are matched with the crotch side of the integrated release fork (7), the axial front end is in constant contact with the clutch release finger, and the axial rear end is in constant contact with the arc surface of the integrated release fork (7); the upper and lower ends of the integrated release fork (7) are respectively equipped with a support rod polyamide wear-resistant spherical bushing (1) and a push rod polyamide wear-resistant spherical bushing (4), the support rod polyamide wear-resistant spherical bushing (1) ball socket is matched with the release fork support rod (2) ball head, and the push rod polyamide wear-resistant spherical bushing (4) ball socket is matched with the AMT pneumatic booster cylinder push rod (5) ball head, and the three form a lever structure.

2. The light truck AMT transmission high reliability separation system according to claim 1 is characterized in that: The support rod polyamide wear-resistant spherical bushing (1) and the top rod polyamide wear-resistant spherical bushing (4) are installed with the integrated separation fork (7) by transition fit.

3. The light truck AMT transmission high reliability separation system according to claim 1 is characterized in that: The integrated release fork (7) is an integral structure, which is processed by a forging machine and has an arched beam frame rib structure. The contact surface between the integrated release fork (7) and the maintenance-free release bearing (8) is designed in an arc shape.

4. The light truck AMT transmission high reliability separation system according to claim 1 is characterized by: The maintenance-free release bearing (8) is embedded with engineering wear-resistant nylon material.

5. The light truck AMT transmission high reliability separation system according to claim 1 is characterized by: The input shaft end cover (9) is positioned with the oil pump housing assembly through a stopper, and the oil pump housing is mounted on the gearbox front housing (3), thereby indirectly positioning the input shaft end cover (9) and the gearbox front housing (3), and fixing and clamping the input shaft end cover (9) through bolts.

6. The light truck AMT transmission high reliability separation system according to claim 1 is characterized by: The gearbox front housing (3) adopts an integrated design, wherein the pneumatic booster cylinder bracket is integrated on the gearbox front housing (3) at the lower end, and the AMT pneumatic booster cylinder (6) is directly connected to the gearbox front housing (3) via bolts; and the interface of the release fork support rod (2) is integrated on the gearbox front housing (3) at the upper end, and the release fork support rod (2) is provided with a thread at the rear end, so as to directly realize thread connection with the gearbox front housing (3).

7. The light truck AMT transmission high reliability separation system according to any one of claims 1 to 6, characterized in that: The matching interface between the gearbox front housing (3) and the clutch assembly adopts a standardized design, thereby achieving the adaptation of various types of clutches under the same standard.

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