False-engagement-preventing parking gear shifting structure for parking and gear shifting shared gear shift lever

Abstract

The utility model discloses a mistaken-engagement-preventing parking gear shifting structure for a shared gear lever for parking and gear shifting, and belongs to the technical field of tractor gearboxes. The structure comprises a gear shift lever, a gear shift shaft, a shifting arm and a gear shift execution unit, the gear shift shaft is sleeved with a compression spring, and the compression spring is located on a shaft section between the gear shift lever and a gearbox upper cover; a positioning spring pin is fixedly arranged on the gear shifting shaft and located on the left side of the compression spring. When the gear shift lever is located at the first position, the compression spring is in a natural stretching state; when the gear shift lever is switched from the second position to the third position, the gear shift shaft moves rightwards, the compression spring is compressed and generates gradually-increased elastic resistance, clear operation hand feeling is provided, and mistaken engagement of the parking gear is effectively prevented. The gear shifting mechanism is simple in structure, low in machining cost and convenient to assemble, and the reliability of gear shifting operation and the driving safety are improved.

Description

Technical Field

[0001] This utility model belongs to the field of tractor gearbox technology, and in particular relates to a parking shift structure for using a shared gear lever for both parking and shifting to prevent accidental engagement of the parking shift lever. Background Technology

[0002] Currently, tractor gearboxes often employ a design where the gear-locking parking mechanism and the shifting mechanism share a single gear lever, such as... Figure 1 As shown, the gear shift lever moves at varying angles within the same plane to select gears, and has three working positions: the first position is "first to third gear", the second position is "second to fourth gear", and the third position is "parking gear". In existing technology, such as... Figure 2 As shown, the shift shaft 3 connected to the gear lever 1 has a groove 301. Gear identification is achieved through the cooperation of a soft limiting mechanism 303 composed of a spring and a steel ball with a step 302 between the grooves. This structure has the following problems:

[0003] The complex structure increases the difficulty and cost of processing; the operating force is unstable and the feel is not obvious. In addition, the steps between the shift shaft grooves are short and the stroke of the operating force change is short. It is easy to rush over without feeling it, resulting in the accidental engagement of the parking gear, which poses a safety hazard and is easy to damage the gears.

[0004] Therefore, a gear shifting structure that is simple in structure, has a clear operating feel, and can effectively prevent accidental engagement of the parking gear is required. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides the following technical solution:

[0006] A parking shift structure for using a shared gear lever for both parking and shifting to prevent accidental engagement includes a gear lever, a shift shaft, a shift arm, and a shift execution unit.

[0007] A compression spring is fitted on the shift shaft, and the compression spring is located on the shaft section of the shift shaft between the gear lever and the gearbox cover.

[0008] A positioning spring pin is fixedly installed on the shift shaft, located to the left of the compression spring;

[0009] When the gear lever is in the first position, the compression spring is in a naturally extended state, and its natural length is less than the axial distance between the positioning spring pin on the shift shaft and the gearbox cover at this time.

[0010] When the gear lever is switched from the second position to the third position, the shift shaft moves to the right, and the two ends of the compression spring abut against the positioning spring pin and the gearbox cover respectively, generating compressive elastic resistance.

[0011] Furthermore, the natural length of the compression spring is equal to the axial distance between the positioning spring pin and the gearbox cover when the gear lever is in the second position.

[0012] Furthermore, the minimum length of the compression spring under extreme compression is less than the axial distance between the positioning spring pin and the gearbox cover when the gear lever is in the third position.

[0013] Furthermore, a radially extending connecting arm is fixed to the left end of the shift shaft, and a connecting hole is provided at the outer end of the connecting arm, into which the connecting ball at the lower end of the shift lever is fitted.

[0014] The shift lever is fixed in the middle with a shift lever ball. The upper end of the tower-shaped compression spring presses against the retaining ring in the shift housing groove, and the lower end presses against the shift lever ball, so that the shift lever ball is kept in contact with the tapered hole formed by the shift housing for support.

[0015] Furthermore, the shifting execution unit includes a first and third gear shift block, a second and fourth gear shift block, and a parking swing arm arranged sequentially below the shift arm, with shifting grooves provided at the top of each of the three.

[0016] The first and third gear shift blocks and the first and third gear shift forks are fixed on the first and third gear slide rod;

[0017] The second and fourth gear shift blocks and the second and fourth gear shift forks are fixed on the second and fourth gear slide rods;

[0018] The first and third gear slide rods and the second and fourth gear slide rods are slidably connected at one end to the slide rod bracket and at the other end to the gearbox housing. The slide rod bracket is fixed to the gearbox housing.

[0019] The middle part of the parking swing arm is sleeved on the parking swing arm shaft, and the lower end is used to control the parking lock; the parking swing arm shaft is fixed to the gearbox housing by the parking swing arm shaft bracket.

[0020] This utility model has a simplified structure, the shift shaft does not require high-frequency quenching heat treatment, resulting in low processing costs and simple assembly process; the operation feel is clear, effectively preventing accidental engagement of the parking gear, and improving driving safety and operational reliability. Attached Figure Description

[0021] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the existing gear selector position;

[0023] Figure 2 This is a schematic diagram of the existing shift shaft structure;

[0024] Figure 3 This is a cross-sectional view of the shift shaft portion of this utility model (shift lever in the first position).

[0025] Figure 4 This is a cross-sectional view of the gear shift lever of this utility model;

[0026] Figure 5 This is an isometric drawing of the execution part of this utility model;

[0027] Figure 6 This is an isometric view of the execution part of this utility model from another perspective.

[0028] The reference numerals in the diagram are as follows: 1-gear shift lever; 2-connecting arm; 3-shift shaft; 4-first spring pin; 5-shift housing; 6-shift lever ball; 7-second spring pin; 8-tower-shaped compression spring; 9-circlip; 10-positioning spring pin; 11-compression spring; 12-gearbox cover; 13-shift lever arm; 14-first and third gear shift blocks; 15-first and third gear slide rods; 16-first and third gear shift forks; 17-second and fourth gear shift blocks; 18-second and fourth gear slide rods; 19-second and fourth gear shift forks; 20-parking swing arm shaft bracket; 21-slide rod bracket; 22-parking swing arm shaft; 23-parking swing arm; 101-connecting ball; 201-connecting hole; 301-groove; 302-step; 303-soft limit mechanism; 501-conical hole. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0030] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] like Figure 3 As shown, the left end of the shift shaft 3 is connected to the bottom end of the gear lever 1. The shift shaft 3 passes through the gearbox cover 12. The right end of the shift shaft 3 located inside the gearbox is fixed with a lever arm 13. The lever arm 13 fixed to the right end of the shift shaft 3 is connected to the shift execution unit inside the gearbox. When the gear lever 1 is shifted to the first position, the second position, and the third position, the shift shaft 3 can move along its own axis under the shifting of the gear lever 1. The movement of the shift shaft 3 synchronously drives the lever arm 13 fixed to the right end to move. The movement of the lever arm 13 drives the shift execution unit to perform the corresponding shifting action.

[0032] The core technical concept of this utility model is to mount a compression spring 11 on the shift shaft 3. The compression spring 11 is located on the shift shaft 3 between the gear lever 1 and the gearbox cover 12. A positioning spring pin 10 is also fixedly installed on the shaft of the shift shaft 3 to the left of the compression spring 11. When the gear lever 1 is in the first position, the compression spring 11 is in a naturally extended state, and the length L1 of the compression spring is less than the distance L2 between the positioning spring pin 10 and the gearbox cover 12 at this time. The naturally extended length L1 of the compression spring should satisfy the condition that when the gear lever 1 shifts to the second position, after the shift shaft 3 moves axially to the right by a corresponding distance under the action of the gear lever 1, the two ends of the compression spring 11 simultaneously abut against the positioning spring pin 10 and the gearbox cover 12. Alternatively, the naturally extended length L1 of the compression spring is equal to the axial distance between the positioning spring pin 10 on the shift shaft 3 and the gearbox cover 12 when the gear lever 1 shifts to the second position.

[0033] Preferably, the minimum length of the compression spring 11 when it is under extreme compression should be less than the distance between the positioning spring pin 10 on the shift shaft 3 and the gearbox cover 12 when the gear lever 1 is shifted to the third position, so as to avoid the compression spring 11 from hindering the shift to the third position.

[0034] In other words, the compression spring 11 is not always compressed. When the gear lever 1 switches between the first and second positions, the compression spring 11 is not simultaneously squeezed by the positioning spring pins 10 at both ends and the gearbox cover 12. The shifting resistance provided by the compression spring 11 is zero.

[0035] When the gear lever 1 shifts from the second position to the third position, the shift shaft 3 moves to the right under the action of the gear lever 1. The two ends of the compression spring 11 are pressed by the positioning spring pin 10 and the gearbox cover 12. The elastic resistance provided by the compression spring 11 is present and increases during this process, giving the driver a clear sense of resistance. This makes the driver aware that a parking operation is about to be performed. In case of misoperation, there is sufficient time to interrupt the operation in time, thus effectively avoiding misoperation.

[0036] Furthermore, combined with Figure 4As shown, the specific structural form of the connection between the left end of the shift shaft 3 and the bottom end of the gear lever 1, and the ability of the shift shaft 3 to move along its own axial direction under the action of the gear lever 1, is as follows: The left end of the shift shaft 3 is fixedly connected to a connecting arm 2 via a first spring pin 4. The connecting arm 2 extends radially along the shift shaft 3, and a connecting hole 201 is formed at the outer end of the connecting arm 2. A connecting ball 101 is formed at the lower end of the gear lever 1, and the connecting ball 101 at the lower end of the gear lever 1 is embedded in the connecting hole of the connecting arm 2. The shift lever 1 has a sliding fit with the shift ball 6 fixedly mounted in the middle by the second spring pin 7. The upper end of the tower-shaped compression spring 8 presses on the snap ring 9 in the groove of the shift housing 5, and the lower end of the tower-shaped compression spring 8 presses on the shift ball 6, so that the shift ball 6 is supported by the tapered hole 501 formed by the shift housing 5. This achieves a hinge between the shift lever 1 and the shift housing 5 at the shift ball 6. When the shift lever 1 is moved laterally, it can drive the shift shaft 3 to generate axial movement.

[0037] Furthermore, combined with Figure 5 and Figure 6 As shown, the specific structural form of this utility model, in which the shifting arm 13 moves to drive the shifting execution unit to perform corresponding shifting actions, is as follows:

[0038] Below the toggle arm 13, a first and third gear shift block 14, a second and fourth gear shift block 17, and a parking swing arm 23 are placed in sequence, and each of the first and third gear shift block 14, the second and fourth gear shift block 17, and the parking swing arm 23 has a shift groove formed on its top.

[0039] The first and third gear shift blocks 14 and the first and third gear shift forks 16 are fixed to the first and third gear slide rods 15 by pins. One end of the first and third gear slide rods 15 is slidably connected to the slide rod bracket 21, and the other end is slidably connected to the gearbox housing. The slide rod bracket 21 is fixed to the gearbox housing by screws.

[0040] When the gear lever 1 is in the first position, the ball head of the shift arm 13 can be inserted into the shift groove of the first and third gear shift block 14. The gear lever 1 swings back and forth, causing the shift arm 13 to swing back and forth. The first and third gear slide bar 15 and the first and third gear shift fork 16 move back and forth at the same time. The first and third gear shift fork 16 shifts the gear to change gears.

[0041] Similarly, the second and fourth gear shift blocks 17 and the second and fourth gear shift forks 19 are fixed to the second and fourth gear slide rods 18 by pins. One end of the second and fourth gear slide rods 18 is slidably connected to the slide rod bracket 21, and the other end is slidably connected to the gearbox housing. When the gear lever 1 is in the second position, the ball head of the shift arm 13 can be inserted into the shift groove of the second and fourth gear shift blocks 17. The back-and-forth swing of the gear lever 1 can drive the shift arm 13 to swing back and forth. The second and fourth gear slide rods 18 and the second and fourth gear shift forks 19 move back and forth at the same time, and the second and fourth gear shift forks 19 shift the gears to change gears.

[0042] The middle part of the parking arm 23 is fitted onto the parking arm shaft 22 through a through hole. The parking arm shaft 22 is fixed to the parking arm shaft bracket 20 by screws. The parking arm shaft bracket 20 is fixed to the gearbox housing.

[0043] When the gear lever 1 is moved to the third position, the ball head of the lever arm 13 enters the U-shaped groove of the parking swing arm 23. The gear lever 1 swings back and forth, causing the lever arm 13 to swing back and forth. The parking swing arm 23 swings around the parking swing arm shaft 22 at the same time. The lower end of the parking swing arm 23 controls the parking lock.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A false parking gear shifting prevention structure for parking and gear shifting shared shift lever, comprising a shift lever (1), a gear shifting shaft (3), a shifting arm (13) and a gear shifting execution unit, characterized in that: a compression spring (11) is sleeved on the gear shifting shaft (3) and located on the shaft section of the gear shifting shaft (3) between the shift lever (1) and the upper cover (12) of the gearbox; a positioning spring pin (10) is fixedly arranged on the gear shifting shaft (3) and located on the left side of the compression spring (11); when the shift lever (1) is in the first position, the compression spring (11) is in a natural extension state, and the natural length of the compression spring (11) is smaller than the axial distance between the positioning spring pin (10) and the upper cover (12) of the gearbox at this time; when the shift lever (1) is switched from the second position to the third position, the gear shifting shaft (3) moves axially to the right, the compression spring (11) abuts against the positioning spring pin (10) and the upper cover (12) of the gearbox at both ends and generates a compression elastic resistance.

2. The false parking gear shifting prevention structure according to claim 1, characterized in that: the natural length of the compression spring (11) is equal to the axial distance between the positioning spring pin (10) and the upper cover (12) of the gearbox when the shift lever (1) is in the second position.

3. The false parking gear shifting prevention structure according to claim 1 or 2, characterized in that: the minimum length of the compression spring (11) in the limit compression state is smaller than the axial distance between the positioning spring pin (10) and the upper cover (12) of the gearbox when the shift lever (1) is in the third position.

4. The false parking gear shifting prevention structure according to claim 1, characterized in that: a radially extending connecting arm (2) is fixedly connected to the left end of the gear shifting shaft (3), an connecting hole (201) is arranged at the outer end of the connecting arm (2), and a connecting ball (101) at the lower end of the shift lever (1) is embedded in the connecting hole (201); a gear shifting lever ball (6) is fixedly connected to the middle part of the shift lever (1), a tower-shaped compression spring (8) is pressed on a snap spring (9) in the groove of a gear shifting shell (5) at the upper end and is pressed on the gear shifting lever ball (6) at the lower end, so that the gear shifting lever ball (6) is supported by abutting against a tapered hole (501) formed by the gear shifting shell (5).

5. The false parking gear shifting prevention structure according to claim 1, characterized in that: the gear shifting execution unit comprises a three-gear shifting block (14), a two-four-gear shifting block (17) and a parking swing arm (23) arranged in sequence below the shifting arm, and the top ends of the three blocks are respectively provided with shifting grooves; the three-gear shifting block (14) and a three-gear shifting fork (16) are fixed on a three-gear shifting slide rod (15); the two-four-gear shifting block (17) and a two-four-gear shifting fork (19) are fixed on a two-four-gear shifting slide rod (18); one end of the three-gear shifting slide rod (15) and the two-four-gear shifting slide rod (18) is respectively slidably connected to a slide rod support (21), and the other end is slidably connected to the gearbox body, and the slide rod support (21) is fixed to the gearbox shell; the parking swing arm (23) is sleeved on a parking swing arm shaft (22) at the middle part, and the lower end is used for controlling the parking lock; and the parking swing arm shaft (22) is fixed to the gearbox shell through a parking swing arm shaft support (20). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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