CN218882982U

CN218882982U - Shifting fork mechanism

Info

Publication number: CN218882982U
Application number: CN202222576256.XU
Authority: CN
Inventors: 刘虎
Original assignee: Weifang Luyuan Machinery Co ltd
Current assignee: Weifang Luyuan Machinery Co ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2023-04-18
Anticipated expiration: 2032-09-28

Abstract

The utility model discloses a shifting fork mechanism, which belongs to the technical field of agricultural equipment and is used for realizing the transmission connection between a wheel driving shaft and a transmission output shaft, and comprises a sliding gear sleeved on the transmission output shaft and a shifting fork shaft arranged perpendicular to the sliding gear, wherein a shifting fork structure is arranged in the middle of the shifting fork shaft, one end of the sliding gear is provided with a braking section in transmission connection with a brake, the other end of the sliding gear is provided with a gear section, and the middle part of the sliding gear is provided with a limit structure matched with the shifting fork structure; the shifting fork mechanism and the brake are both arranged in the shell, and one end of the shifting fork shaft extends out of the shell and is connected with a driving mechanism; the wheel driving shaft is provided with a driven wheel matched with the gear section, the transmission output shaft is provided with a power output structure for realizing the rotation of the transmission output shaft, and the gear section is matched with the power output structure.

Description

Shifting fork mechanism

Technical Field

The utility model relates to a gearbox technical field, concretely relates to shifting fork mechanism.

Background

Tractors are increasingly used in agriculture, engineering, and other fields to pull and drive work machines to perform various mobile or fixed operations. Among them, the transmission is an important part of a tractor, and functions to change the driving force and the running speed of the tractor, to make the tractor go forward or backward, and to stop and output power under the working condition of an engine, etc.

At present, a transverse shaft gearbox is widely adopted in a tractor gearbox, when a tractor is braked, the wheels are stopped by using friction force between a brake and a wheel driving shaft, in the process, the wheels are suddenly stopped to cause violent collision among wheels at all levels in a transmission, so that gears are easily damaged, and in the braking process of a vehicle, the brake is abraded due to the fact that power of an engine is kept continuously output for a period of time, so that the service life of the brake is influenced.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model provides a shifting fork mechanism can realize breaking away from fast of sliding gear and power take off structure at the braking state in-process, realizes the idle running of gearbox, and the continuous output that both can avoid braking in-process engine causes the wearing and tearing to the stopper, can avoid the sudden stop of gearbox to cause the collision between the gear at different levels again, is favorable to improving the life of gearbox and stopper.

In order to realize the purpose, the utility model discloses a technical scheme as follows:

the shifting fork mechanism is used for realizing transmission connection between a wheel driving shaft and a transmission output shaft and comprises a sliding gear sleeved on the transmission output shaft and a shifting fork shaft perpendicular to the sliding gear, a shifting fork structure is arranged in the middle of the shifting fork shaft, a brake section in transmission connection with a brake is arranged at one end of the sliding gear, a gear section matched with a gear group in the transmission is arranged at the other end of the sliding gear, and a limiting structure matched with the shifting fork structure is arranged in the middle of the sliding gear;

the shifting fork mechanism and the brake are both arranged in the shell, and one end of the shifting fork shaft extends out of the shell and is connected with a driving mechanism;

the wheel driving shaft is provided with a driven wheel matched with the gear section, the transmission output shaft is provided with a power output structure for realizing the rotation of the transmission output shaft, and the gear section is matched with the power output structure.

Preferably, the gear section including can realize with from the convex tooth of driving wheel engaged with, the convex tooth is followed gear section axial direction sets up gear section surface, the gear section is kept away from limit structure's terminal surface is equipped with a plurality of evenly distributed's the recess that can realize with transformer gear train looks joint.

Preferably, the shifting fork structure comprises a U-shaped support, shifting forks are installed at two ends of the U-shaped support in a threaded mode, the shifting forks are matched with the limiting structures, and the shifting fork shafts are fixedly installed at the bent ends of the U-shaped support and are parallel to the shifting forks.

Preferably, the limiting structure comprises two ring platforms which are parallel to each other and fixedly arranged on the sliding gear, one end of the shifting fork is installed on the U-shaped support in a threaded mode, the other end of the shifting fork extends into the space between the two ring platforms, a rotating wheel is installed on the shifting fork in a rotating mode, and the rotating wheel is abutted to the side faces, close to the ring platforms, of the two ring platforms.

Preferably, the braking section is provided with an external spline for being connected with the brake, a spring accommodating cavity is arranged between the braking section and the transmission output shaft, a return spring for returning the sliding gear is installed in the spring accommodating cavity, and the return spring is sleeved on the transmission output shaft.

The utility model has the advantages of that:

1. the utility model discloses in utilize the declutch shift shaft to rotate, drive the removal of sliding gear on the derailleur output shaft, realize sliding gear and drive structure's connection and disconnection, and then realize the disconnection and the connection of gearbox and agricultural machinery wheel drive shaft, can be in the braking state in-process, realize sliding gear and power take off structure's quick break away from, realize the idle running of gearbox, both can avoid the continuous output of engine in the braking process to cause the wearing and tearing to the stopper, can avoid the sudden stop of gearbox to cause the collision between the gear at different levels again, be favorable to improving the life of gearbox and stopper;

2. the utility model can realize the independent control of the rotating speed of two different driving wheels by using the shifting fork structure with two symmetrical designs, thereby facilitating the agricultural machinery to complete the pivot steering and being beneficial to improving the flexibility of the operation of the agricultural machinery;

3. the utility model utilizes the reset spring to push the sliding gear to move towards the direction close to the power output structure, so that the groove and the power output structure can be conveniently clamped when the sliding gear is contacted with the power output structure with low rotating speed after the braking is finished;

4. the utility model adopts the design of movable connection between the shifting fork and the limiting structure, which is beneficial to reducing the limit between the shifting fork and the sliding gear, reducing the precision requirement between the shifting fork and the sliding gear and making the matching between the shifting fork and the sliding gear more flexible;

5. in the utility model, the U-shaped support, the shifting fork shaft and the shifting forks are matched, the shifting forks can be symmetrically distributed on two sides of the sliding gear by utilizing the U-shaped support, and the shifting fork shaft can simultaneously push the sliding gear to move when rotating, so that the sliding gear is more uniformly stressed, and the abrasion between the sliding gear and the output shaft of the transmission when relative displacement occurs in the rotating process can be effectively reduced;

6. the utility model adopts the screw thread installation between the U-shaped bracket and the shifting fork, which is convenient for the installation and the replacement of the shifting fork, and can control the length of the shifting fork extending between the two annular platforms, thereby avoiding the abrasion of the shifting fork and the rotating sliding gear caused by the contact;

7. the utility model discloses in utilize runner and shift fork to cooperate, utilize the runner to follow the sliding gear rotation and reduce the frictional force that sliding gear acted on the shift fork at the removal in-process, be favorable to slowing down the wearing and tearing of shift fork, improve its life.

Drawings

Fig. 1 is the overall structure schematic diagram of the shifting fork mechanism of the utility model.

In the figure: 1-shifting fork shaft, 2-braking section, 3-gear section, 4-limiting structure, 5-U-shaped bracket, 6-shifting fork and 7-groove.

Detailed Description

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

The shifting fork mechanism shown in fig. 1 is used for realizing transmission connection between a wheel driving shaft and a transmission output shaft, and comprises a sliding gear sleeved on the transmission output shaft and a shifting fork shaft 1 perpendicular to the sliding gear, wherein a shifting fork structure is arranged in the middle of the shifting fork shaft 1, one end of the sliding gear is provided with a braking section 2 in transmission connection with a brake, the other end of the sliding gear is provided with a gear section 3, and the middle part of the sliding gear is provided with a limiting structure 4 matched with the shifting fork structure; the gearbox is provided with a shell at two ends of the output shaft of the gearbox, the shifting fork mechanism and the brake are both arranged in the shell, one end of the shifting fork shaft 1 extends out of the shell and is connected with the driving mechanism, and the rotating speeds of two different driving wheels can be controlled independently by using the two symmetrically designed shifting fork structures, so that the agricultural machine can complete in-situ steering conveniently, and the flexibility of the operation of the agricultural machine can be improved; a driven wheel matched with the gear section 3 is arranged on the wheel driving shaft, a power output structure for realizing the rotation of a transmission output shaft is arranged on the transmission output shaft, and the gear section 3 is matched with the power output structure; through the rotation of control declutch shift 1, drive the removal of sliding gear on the derailleur output shaft, realize sliding gear and drive structure's connection and disconnection, and then realize the disconnection and the connection of gearbox and agricultural machinery wheel drive shaft, can be in the braking state in-process, realize sliding gear and power take off structure's quick breaking away from, realize the idle running of gearbox, both can avoid the continuous output of braking in-process engine to cause the wearing and tearing to the stopper, can avoid the sudden stop of gearbox to cause the collision between the gear at different levels again, be favorable to improving the life of gearbox and stopper.

Gear section 3 including can realize with from the gear engaged with dogtooth, the dogtooth is followed 3 axial direction of gear section set up 3 surfaces of gear section, gear section 3 is kept away from limit structure 4's terminal surface be equipped with a plurality of evenly distributed can realize with actuating mechanism looks joint's recess 7.

The shifting fork structure comprises a U-shaped support 5, shifting forks 6,U are installed at two ends of the U-shaped support 5 in a threaded mode, the shifting

forks

5 and 6 are installed in a threaded mode, the shifting forks 6 can be installed and replaced conveniently, the length of the shifting forks 6 extending between two ring platforms can be controlled, the shifting forks 6 are prevented from being in contact with sliding gears in a rotating mode to be abraded, the shifting forks 6 are matched with the limiting structures 4, the shifting fork shafts 1 are fixedly installed at the bent ends of the U-shaped support 5, the shifting fork shafts 1 are parallel to the shifting forks 6, the shifting forks 6 and the limiting structures 4 are movably connected, limitation between the shifting forks 6 and the sliding gears is reduced, accuracy requirements between the shifting forks 6 and the sliding gears are reduced, and matching between the shifting forks 6 and the sliding gears is flexible.

The limiting structure 4 comprises two ring platforms which are parallel to each other and fixedly arranged on the sliding gear, one end of the shifting fork 6 is installed on the U-shaped support 5 in a threaded mode, the other end of the shifting fork 6 extends between the two ring platforms, and the shifting fork 6 and the limiting structure 4 are movably connected, so that the limitation between the shifting fork 6 and the sliding gear is favorably reduced, the precision requirement between the shifting fork 6 and the sliding gear is favorably reduced, and the matching between the shifting fork 6 and the sliding gear is more flexible; stretch into two between the ring platform the last runner of installing of rotating of shifting fork, the runner all with two the side butt that the ring platform is close to each other utilizes the runner to follow the sliding gear rotation and reduces the frictional force that sliding gear acted on shifting fork 6 at the removal in-process, is favorable to slowing down the wearing and tearing of shifting fork 6, improves its life.

Braking section 2 be provided with be used for with the external splines that the stopper is connected, be equipped with spring holding chamber between braking section 2 and the derailleur output shaft, spring holding intracavity is installed and is used for reset spring that the sliding gear resets, reset spring suit is in on the derailleur output shaft, utilize reset spring to promote sliding gear to removing to being close to power take off structure direction, can accomplish the back at the braking, when sliding gear and the power take off structure contact of low-speed, make things convenient for recess 7 and power take off structure to realize the joint.

The foregoing is merely exemplary and illustrative of the structure of the invention, and various modifications, additions and substitutions as described in the detailed description may be made by those skilled in the art without departing from the structure or exceeding the scope of the invention as defined in the claims.

Claims

1. The shifting fork mechanism is used for realizing transmission connection between a wheel driving shaft and a transmission output shaft and is characterized by comprising a sliding gear sleeved on the transmission output shaft and a shifting fork shaft perpendicular to the sliding gear, wherein a shifting fork structure is arranged in the middle of the shifting fork shaft, one end of the sliding gear is provided with a braking section in transmission connection with a brake, the other end of the sliding gear is provided with a gear section, and the middle part of the sliding gear is provided with a limiting structure matched with the shifting fork structure;

the speed changing boxes at two ends of the output shaft of the speed changer are respectively provided with a shell, the shifting fork mechanism and the brake are both arranged in the shell, and one end of the shifting fork shaft extends out of the shell and is connected with a driving mechanism;

a driven wheel matched with the gear section is arranged on the wheel driving shaft, a power output structure for realizing the rotation of the transmission output shaft is arranged on the transmission output shaft, and the gear section is matched with the power output structure;

the shifting fork structure comprises a U-shaped support, shifting forks are arranged at two ends of the U-shaped support in a threaded mode, the shifting forks are matched with the limiting structure, the shifting fork shafts are fixedly arranged at the bent ends of the U-shaped support, and the shifting fork shafts are parallel to the shifting forks;

the limiting structure comprises two ring platforms which are fixedly arranged on the sliding gear in parallel, one end of the shifting fork is installed on the U-shaped support in a threaded mode, the other end of the shifting fork extends into the space between the two ring platforms and extends into the space between the two ring platforms, a rotating wheel is installed on the shifting fork in a rotating mode, and the rotating wheel is abutted to the side face, close to the two ring platforms, of each other.

2. A fork mechanism according to claim 1, wherein the gear segment includes teeth for engaging with the driven wheel, the teeth are disposed on the surface of the gear segment along the axial direction of the gear segment, and the end surface of the gear segment remote from the limiting structure is provided with a plurality of uniformly distributed grooves for engaging with the driving mechanism.

3. The shifting fork mechanism according to claim 1, wherein the brake section is provided with an external spline for connecting with the brake, a spring accommodating cavity is arranged between the brake section and the transmission output shaft, a return spring for returning the sliding gear is installed in the spring accommodating cavity, and the return spring is sleeved on the transmission output shaft.