Pressure air cylinder with adjustable gear shifting force and adjusting method of pressure air cylinder

Abstract

The invention discloses a pressure air cylinder with adjustable gear shifting force and an adjusting method thereof. The pressure air cylinder comprises a range gear air cylinder and an auxiliary box air cylinder cover. A piston is arranged in the range gear air cylinder and divides the space in the air cylinder into an auxiliary box air cylinder high-gear cavity and an auxiliary box air cylinder low-gear cavity. A high-grade air inlet and outlet hole and a high-grade air outlet hole are formed in the auxiliary box air cylinder cover and both communicated with the auxiliary box air cylinder high-grade cavity. A low-gear intake and exhaust hole and a low-gear exhaust hole are formed in the range gear cylinder; the low-gear air inlet and outlet hole and the low-gear exhaust hole are both communicated with the auxiliary box air cylinder low-gear cavity. The piston is connected with a shifting fork shaft, and the other end of the shifting fork shaft penetrates out of the range gear air cylinder. And hole sealing assemblies are arranged in the high-gear exhaust hole and the low-gear exhaust hole. According to the pressure air cylinder, through the structural design, especially the arrangement of the hole sealing assembly, fine adjustment of the air inlet pressure of the air cylinder is achieved, and the problem that the air inlet pressure of the air cylinder is too large, and teeth of a synchronizer are prone to being broken is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile transmissions, and in particular relates to a pressure cylinder with adjustable shifting force and a regulating method thereof. Background Art

[0002] At present, commercial vehicle auxiliary box synchronizers mostly use cylinder power shifting and there are many types of shifting cylinders. Among them, the shifting of MT and AMT is achieved by controlling the air intake of the cylinder. The advantages of this shifting method are: easy access to high-pressure air source, low cost of use, simple air circuit design and control. However, in actual use, the use of cylinder shifting has the following defects: the air source pressure may be unstable, which will affect the shifting quality, and if the air pressure entering the cylinder is too high, it will cause excessive shifting force and cause synchronizer gear knocking; the cylinder does not have the function of actively adjusting the air pressure, and the pressure required for high and low gear synchronizer shifting is different. The same pressure may cause a certain gear to knock.

[0003] Therefore, it is urgent to design a cylinder that can provide different shifting forces for the switching of high gear and low gear in the high-low gear conversion mechanism of the auxiliary box. Summary of the invention

[0004] In view of the above-mentioned deficiencies and defects of the prior art, the purpose of the present invention is to provide a pressure cylinder with adjustable shift force to solve the technical problem in the prior art that excessive intake pressure of the shift cylinder may cause synchronizer gear knocking.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0006] A pressure cylinder with adjustable shift force, comprising a range gear cylinder and a sub-box cylinder cover arranged at the front end of the range gear cylinder;

[0007] A piston is arranged in the range cylinder, and the piston divides the space in the cylinder into a high-end cavity of the auxiliary box cylinder and a low-end cavity of the auxiliary box cylinder;

[0008] The auxiliary box cylinder head is provided with high-speed inlet and outlet holes and high-speed exhaust holes, and the high-speed inlet and outlet holes and high-speed exhaust holes are both connected to the high-speed cavity of the auxiliary box cylinder; the range gear cylinder is provided with low-speed inlet and outlet holes and low-speed exhaust holes, and the low-speed inlet and outlet holes and low-speed exhaust holes are both connected to the low-speed cavity of the auxiliary box cylinder;

[0009] The piston is connected to a shift fork shaft, and the other end of the shift fork shaft passes through the range cylinder;

[0010] The high-grade exhaust hole and the low-grade exhaust hole are both provided with sealing components.

[0011] The present invention also has the following technical features:

[0012] Specifically, the high-grade exhaust hole has the same structure as the low-grade exhaust hole, and both include a first hole segment and a second hole segment coaxially connected from top to bottom, and a limited step surface is formed at the connection between the first hole segment and the second hole segment.

[0013] Furthermore, the sealing assembly includes a steel ball, a spring and a screw arranged in sequence from bottom right to top, the steel ball abuts against the limiting step surface; one end of the spring abuts against the steel ball, and the other end abuts against the screw; a screw exhaust hole is axially arranged in the screw.

[0014] Furthermore, a mounting hole is provided through the middle of the piston, the front end of the shift fork shaft passes through the mounting hole, and the piston is fixed on the shift fork shaft by means of a locking nut.

[0015] Furthermore, the piston is sealed and connected to the range gear cylinder via a first sealing ring; and the piston is sealed and connected to the shift fork shaft via a second sealing ring.

[0016] Furthermore, the range gear cylinder and the shift fork shaft are sealed and connected via a third sealing ring.

[0017] Furthermore, a first axial limiting plane capable of limiting the axial movement of the piston is formed at the connection between the range cylinder and the auxiliary box cylinder head; and a second axial limiting plane capable of limiting the axial movement of the piston is formed on the rear wall of the range cylinder.

[0018] Furthermore, an internal thread matching the external thread of the screw is arranged on the inner wall of the first hole segment; the inner diameter of the first hole segment is larger than the diameter of the steel ball, and the inner diameter of the second hole segment is smaller than the diameter of the steel ball.

[0019] The present invention also protects a method for adjusting a cylinder mechanism with adjustable shift force, comprising:

[0020] From low gear position to high gear position: according to the air pressure threshold in the high gear cavity of the auxiliary box cylinder, adjust the axial compression of the spring in the high gear exhaust hole; tighten the screw to complete the spring limit; compressed gas enters the high gear cavity of the auxiliary box cylinder through the high gear intake and exhaust holes, and the compressed gas pushes the piston to move backward along the axis with the shift fork shaft, and the gas in the low gear cavity of the auxiliary box cylinder is discharged through the low gear intake and exhaust holes of the cylinder; when the pressure in the high gear cavity of the auxiliary box cylinder exceeds the air pressure threshold, the steel ball moves axially upward along the first hole section, and the compressed gas is discharged through the high gear exhaust hole. After the piston moves to the axial limit plane in the range gear cylinder, the gear shift is completed;

[0021] From high-speed position to low-speed position: according to the air pressure threshold in the low-speed cavity of the auxiliary box cylinder, adjust the axial compression of the spring in the low-speed exhaust hole; tighten the screw to complete the spring limit; compressed gas enters the low-speed cavity of the auxiliary box cylinder through the low-speed intake and exhaust holes, and the compressed gas pushes the piston as work, moving the shift fork shaft forward along the axis, and the gas in the high-speed cavity of the auxiliary box cylinder is discharged through the high-speed intake and exhaust holes; when the pressure in the low-speed cavity of the auxiliary box cylinder exceeds the air pressure threshold, the steel ball moves axially upward along the first hole section, and the compressed gas is discharged through the low-speed exhaust hole. After the piston moves to the axial limit plane in the range cylinder, the gear shift is completed.

[0022] Furthermore, the air pressure threshold is 0.5-1.5 MP.

[0023] Compared with the prior art, the present invention has the following technical effects:

[0024] (1) The pressure cylinder of the present invention achieves fine adjustment of the pressure in the cavity by respectively opening a high-speed exhaust hole on the auxiliary box cylinder head and a low-speed exhaust hole in the range cylinder, as well as sealing components arranged in the high-speed exhaust hole and the low-speed exhaust hole, thereby solving the problem that the synchronizer gear is easily knocked due to excessive cylinder intake pressure, ensuring the normal operation of the transmission, and thus improving the operating safety of the vehicle.

[0025] (2) The method of the present invention adjusts the cylinder intake pressure with the help of sealing components set in the high-end exhaust hole and the low-end exhaust hole. When the air pressure in the cavity exceeds the set threshold, the movement of the steel ball drives the movement of the spring, thereby opening the high-end exhaust hole or the low-end exhaust hole, solving the problem of excessive cylinder intake pressure.

[0026] (3) The present invention has a simple structure, is easy to use, and has great value for promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a partial structural schematic diagram of the present invention;

[0029] Figure 3 is a schematic diagram of the range gear cylinder mechanism of Example 1;

[0030] Figure 4 It is a schematic diagram of the structure of the auxiliary box cylinder head of Example 1.

[0031] The meaning of each number in the figure is:

[0032] 1-range gear cylinder, 2-auxiliary box cylinder head, 3-piston, 4-auxiliary box cylinder high-end cavity, 5-auxiliary box cylinder low-end cavity, 6-high-end inlet and exhaust holes, 7-high-end exhaust holes, 8-low-end inlet and exhaust holes, 9-low-end exhaust holes, 10-shift fork shaft, 11-sealing hole assembly, 12-limiting step surface, 13-locking nut, 14-first sealing ring, 15-second sealing ring, 16-third sealing ring, 17-first axial limiting plane, 18-second axial limiting plane;

[0033] 111- steel ball, 112- spring, 113- screw; 1131- screw vent hole.

[0034] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0035] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0036] When describing the position, the present invention uses Figure 1 The orientation shown is described.

[0037] The terms "upper", "lower", "front", "back", "top", "bottom", etc. used in the present invention to indicate directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. "Inside" and "outside" refer to the inside and outside of the contour of the corresponding components, and the above terms should not be understood as limitations on the present invention.

[0038] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0039] In the present invention, unless otherwise specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Example 1

[0041] Following the above technical solution, Figures 1 to 4 As shown, this embodiment provides a pressure cylinder with adjustable shift force, including a range cylinder 1 and a sub-box cylinder cover 2 arranged at the front end of the range cylinder 1; the range cylinder 1 and the sub-box cylinder cover 2 are connected by bolts to ensure that the range cylinder 1 and the sub-box cylinder cover 2 will not separate from each other during the operation of the cylinder, thereby improving the safety and stability of the cylinder. A piston 3 is arranged in the range cylinder 1, and the piston 3 divides the space in the range cylinder 1 into a sub-box cylinder high-end cavity 4 and a sub-box cylinder low-end cavity 5; the connection between the range cylinder 1 and the sub-box cylinder cover 2 forms a first axial limit plane 17 for limiting the axial forward movement of the piston along the fork shaft 10, and the inner wall of the back plate of the range cylinder 1 forms a second axial limit plane 18 for limiting the axial backward movement of the piston along the fork shaft 10.

[0042] The auxiliary box cylinder head 2 is provided with high-grade intake and exhaust holes 6 and high-grade exhaust holes 7, which are both connected with the high-grade cavity 4 of the auxiliary box cylinder; the range gear cylinder 1 is provided with low-grade intake and exhaust holes 8 and low-grade exhaust holes 9; the low-grade intake and exhaust holes 8 and low-grade exhaust holes 9 are both connected with the low-grade cavity 5 of the auxiliary box cylinder; when the cylinder is working, exhaust and intake are continuously carried out through the high-grade intake and exhaust holes 6 and the low-grade intake and exhaust holes 8.

[0043] A shift fork shaft 10 is connected to the piston 3 , and the other end of the shift fork shaft 10 passes through the range cylinder 1 , and the piston 3 and the shift fork shaft 10 are vertically arranged.

[0044] Sealing components 11 are provided in both the high-grade exhaust hole 7 and the low-grade exhaust hole 9 .

[0045] As a preferred solution of this embodiment, the high-grade exhaust hole 7 and the low-grade exhaust hole 9 have the same structure, both including a first hole segment and a second hole segment coaxially connected from top to bottom, and a limited step surface 12 is formed at the connection between the first hole segment and the second hole segment.

[0046] As a preferred solution of this embodiment, the sealing assembly 11 is arranged in the first hole segment, and includes a steel ball 111, a spring 112 and a screw 113 arranged in sequence from the lower right to the upper right, the steel ball 111 abuts against the limiting step surface 12; one end of the spring 112 abuts against the steel ball 111, and the other end abuts against the screw 113; a screw exhaust hole 1131 is axially provided in the screw 113. The spring 112 can be pushed by the steel ball 111 to expand and contract in the first hole segment along the axial direction of the first hole segment.

[0047] Preferably, in this embodiment, the top end of the spring 112 is embedded in the screw exhaust hole 1131 , and the moving direction of the spring 112 can be limited by means of the screw exhaust hole 1131 .

[0048] As a preferred solution of this embodiment, a mounting hole 31 is opened through the middle of the piston 3, the front end of the fork shaft 10 passes through the mounting hole 31, and the piston 3 is fixed to the fork shaft 10 by means of a locking nut 13. A through hole is opened at the rear end of the range cylinder 1, the through hole is coaxially connected with the mounting hole 31, and the fork shaft 10 passes through the through hole.

[0049] As a preferred solution of this embodiment, the piston 3 is sealedly connected to the range cylinder 1 via a first sealing ring 14 .

[0050] As a preferred solution of this embodiment, the piston 3 is sealedly connected to the fork shaft 10 via a second sealing ring 15 .

[0051] As a preferred solution of this embodiment, the range gear cylinder 1 and the fork shaft 10 are sealed and connected via a third sealing ring 16 .

[0052] The first sealing ring 14, the second sealing ring 15 and the third sealing ring are used to seal the gaps in the range cylinder 1 to ensure the sealing, safety and reliability of the cylinder and prevent air leakage.

[0053] As a preferred solution of this embodiment, an internal thread matching the external thread of the screw 113 is provided on the inner wall of the first hole segment, and the screw 113 is threadedly connected to the first hole segment; the inner diameter of the first hole segment is larger than the diameter of the steel ball 111, and the inner diameter of the second hole segment is smaller than the diameter of the steel ball 111.

[0054] In this embodiment, when the piston 3 is in the front position in the cylinder, the low gear is executed, and when the piston 3 is in the rear position in the cylinder cavity, the high gear is executed.

[0055] Example 2

[0056] This embodiment discloses a method for adjusting a cylinder mechanism with adjustable shift force, wherein the cylinder with adjustable shift force is the cylinder with adjustable shift force disclosed in Embodiment 1, and the method comprises:

[0057] From low gear position to high gear position: according to the air pressure threshold in the high gear cavity 4 of the auxiliary box cylinder, adjust the axial compression amount of the spring 112 in the high gear exhaust hole 7; tighten the screw 113 to complete the limit of the spring 112; the compressed gas enters the high gear cavity 4 of the auxiliary box cylinder through the high gear inlet and exhaust hole 6, and the compressed gas pushes the piston 3 to move backward along the axis with the fork shaft 10, and the gas in the low gear cavity 5 of the auxiliary box cylinder is discharged through the low gear inlet and exhaust hole 8 of the cylinder; when the pressure in the high gear cavity 5 of the auxiliary box cylinder exceeds the air pressure threshold, the steel ball 111 moves axially upward along the first hole section, and the compressed gas is discharged through the high gear exhaust hole 7, and the piston 3 moves to the first axial limit plane 17 in the range gear cylinder 1, and the gear shift is completed;

[0058] From high gear position to low gear position: according to the air pressure threshold in the low gear cavity 5 of the auxiliary box cylinder, adjust the axial compression amount of the spring 112 in the low gear exhaust hole 9; tighten the screw 113 to complete the limit of the spring 112; the compressed gas enters the low gear cavity 5 of the auxiliary box cylinder through the low gear intake and exhaust hole 8, and the compressed gas does work to push the piston 3, and moves the fork shaft 10 forward along the axis, and the gas in the high gear cavity 4 of the auxiliary box cylinder is discharged through the high gear intake and exhaust hole 6; when the pressure in the low gear cavity 5 of the auxiliary box cylinder exceeds the air pressure threshold, the steel ball 111 moves axially upward along the first hole section, and the compressed gas is discharged through the low gear exhaust hole 9, and the piston 3 moves to the second axial limit plane 18 in the range gear cylinder 1, and the gear shift is completed.

[0059] Furthermore, the air pressure threshold is 0.5 to 1.5 MPa, which can be selected according to the working conditions.

[0060] In this embodiment, taking the 12-speed auxiliary box synchronizer shifting as an example, when shifting from a low gear position to a high gear position, the air pressure threshold in the high gear cavity 4 of the auxiliary box cylinder is set to 0.5Mpa. When the pressure in the cavity is higher than 0.5Mpa, the high-pressure gas is discharged through the high-grade exhaust hole 7, ensuring that the pressure inside the cylinder will not be higher than 0.5Mpa, effectively solving the problem of gear knocking caused by excessive intake pressure.

[0061] The above implementation process is only an example for clearly explaining the present application, and is not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of this application.

Claims

1. A pressure cylinder with adjustable shift force, comprising a range cylinder (1) and a sub-box cylinder cover (2) arranged at the front end of the range cylinder (1), characterized in that: A piston (3) is arranged in the range cylinder (1), and the piston (3) divides the space in the pressure cylinder into a high-end cavity (4) of the auxiliary box cylinder and a low-end cavity (5) of the auxiliary box cylinder; The auxiliary box cylinder head (2) is provided with a high-speed intake and exhaust hole (6) and a high-speed exhaust hole (7), and the high-speed intake and exhaust hole (6) and the high-speed exhaust hole (7) are both connected to the high-speed cavity (4) of the auxiliary box cylinder; the range cylinder (1) is provided with a low-speed intake and exhaust hole (8) and a low-speed exhaust hole (9); the low-speed intake and exhaust hole (8) and the low-speed exhaust hole (9) are both connected to the low-speed cavity (5) of the auxiliary box cylinder; The piston (3) is connected to a shift fork shaft (10), and the other end of the shift fork shaft (10) passes through the range cylinder (1); The high-grade exhaust hole (7) and the low-grade exhaust hole (9) are both provided with sealing components (11).

2. The pressure cylinder with adjustable shift force as claimed in claim 1, characterized in that: The high-grade exhaust hole (7) and the low-grade exhaust hole (9) have the same structure, both comprising a first hole section and a second hole section which are coaxially connected and arranged from top to bottom, and a limited step surface (12) is formed at the connection between the first hole section and the second hole section.

3. The pressure cylinder with adjustable shift force as claimed in claim 2, characterized in that: The sealing assembly (11) comprises a steel ball (111), a spring (112) and a screw (113) which are arranged in sequence from bottom right to top; the steel ball (111) abuts against the limiting step surface (12); one end of the spring (112) abuts against the steel ball (111), and the other end abuts against the screw (113); and a screw exhaust hole (1131) is axially provided in the screw (113).

4. The pressure cylinder with adjustable shift force as claimed in claim 1, characterized in that: A mounting hole (31) is formed through the middle of the piston (3), the front end of the shift fork shaft (10) passes through the mounting hole (31), and the piston (3) is fixed to the shift fork shaft (10) by means of a locking nut (13).

5. The pressure cylinder with adjustable shift force as claimed in claim 1, characterized in that: The piston (3) is sealedly connected to the range gear cylinder (1) via a first sealing ring (14); the piston (3) is sealedly connected to the shift fork shaft (10) via a second sealing ring (15).

6. The pressure cylinder with adjustable shift force as claimed in claim 1, characterized in that: A first axial limiting plane (17) capable of limiting the axial movement of the piston (3) is formed at the connection between the range gear cylinder (1) and the auxiliary box cylinder cover (2); and a second axial limiting plane (18) capable of limiting the axial movement of the piston (3) is formed on the rear wall of the range gear cylinder (1).

7. The pressure cylinder with adjustable shift force as claimed in claim 2, characterized in that: The range gear cylinder (1) and the shift fork shaft (10) are sealed and connected via a third sealing ring (16).

8. The pressure cylinder with adjustable shift force as claimed in claim 3, characterized in that: An internal thread matching the external thread of the screw (113) is arranged on the inner wall of the first hole section; the inner diameter of the first hole section is larger than the diameter of the steel ball (111), and the inner diameter of the second hole section is smaller than the diameter of the steel ball (111).

9. A method for adjusting a cylinder mechanism with adjustable shift force, characterized in that: From low gear position to high gear position: according to the air pressure threshold in the high gear cavity of the auxiliary box cylinder, adjust the axial compression of the spring in the high gear exhaust hole; tighten the screw to complete the spring limit; compressed gas enters the high gear cavity of the auxiliary box cylinder through the high gear intake and exhaust holes, and the compressed gas pushes the piston to move backward along the axis with the shift fork shaft, and the gas in the low gear cavity of the auxiliary box cylinder is discharged through the low gear intake and exhaust holes of the cylinder; when the pressure in the high gear cavity of the auxiliary box cylinder exceeds the air pressure threshold, the steel ball moves upward along the first hole section, and the compressed gas is discharged through the high gear exhaust hole. After the piston moves to the first axial limit plane in the range gear cylinder, the gear shift is completed; From high gear position to low gear position: according to the air pressure threshold in the low gear cavity of the auxiliary box cylinder, adjust the axial compression of the spring in the low gear exhaust hole; tighten the screw to complete the spring limit; the compressed gas enters the low gear cavity of the auxiliary box cylinder through the low gear intake and exhaust holes, and the compressed gas pushes the piston to move forward along the axis with the shift fork shaft, and the gas in the high gear cavity of the auxiliary box cylinder is discharged through the high gear intake and exhaust holes; When the pressure in the low-speed chamber of the auxiliary box cylinder exceeds the air pressure threshold, the steel ball moves axially upward along the first hole section, and the compressed gas is discharged through the low-speed exhaust hole. After the piston moves to the second axial limit plane in the range gear cylinder, the gear shift is completed.

10. The method for adjusting a cylinder mechanism with adjustable shift force as claimed in claim 9, characterized in that: The air pressure threshold is 0.5-1.5 MP.

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