CN112268107A - Gearbox shifting fork and casing matched with same - Google Patents

Abstract

The invention provides a gearbox shifting fork and a shell matched with the gearbox shifting fork, and belongs to the field of machinery. The shifting fork comprises a second body and a second control shaft, wherein the second body comprises a ring-shaped clamping ring portion, a through hole is formed in the second body, the second control shaft is inserted into the through hole, a second convex shifting head is further arranged on the second body, and the shifting fork further comprises a limiting structure which can enable the second body to be positioned at least two positions along the second control shaft in the axial direction. The casing includes casing and lower casing, goes up casing and inferior valve physical stamina lock each other, and the internal one end that supplies control shaft two of having of inferior valve inserts the positioning seat one of location, has the positioning seat two that supplies the two other ends of control shaft to insert the location in the casing of going up, and positioning seat one and positioning seat two make the axial fixity of control shaft two, and this shift fork makes self and casing cost reduction, has strengthened stability, and casing processing is simple and convenient.

Description

Gearbox shifting fork and casing matched with same

Technical Field

The invention belongs to the field of machinery, and relates to a gearbox shifting fork and a shell matched with the gearbox shifting fork.

Background

A transmission is a mechanism for changing the speed and torque from an engine, which can change the ratio of the output shaft to the input shaft, either fixed or in steps, also known as a gearbox. The speed variator consists of speed-changing transmission mechanism and control mechanism, and some vehicles also have power output mechanism. The transmission mechanism is mainly driven by common gears and also driven by planetary gears. The common gear transmission mechanism generally uses a sliding gear, a synchronizer and the like. The shifting fork is an important gear shifting part in the transmission, is connected with a speed changing handle and is positioned at the lower end of the handle, and shifts a middle speed changing wheel to change the input or output speed ratio.

As shown in fig. 1 to 3 of the attached drawings of the specification, the conventional shifting fork comprises a ring-shaped first body, a first control shaft is fixedly connected to the first body, a penetrating seat is arranged on an upper box body of the gearbox and used for positioning one end of the first control shaft, one end of the first control shaft can extend into the penetrating seat, another penetrating seat is arranged on a lower box body, the other end of the first control shaft can extend into the other penetrating seat, and the distance between the two penetrating seats is longer than the length of the first control shaft. The first control shaft moves between the two penetrating seats. Go up still to have seted up built-in passageway on the box, steel ball and spring have in the built-in passageway, built-in passageway tip passes through the shutoff piece and seals, the outer wall that control shaft one stretched into the part has spacing groove one, utilize spring force, the steel ball gets into spacing inslot and can play the limiting displacement to the axial motion of control shaft one to a certain extent, still have dial shaft one on last box, the one end of dialling shaft one has U-shaped mouth one, still have dial head one on the body one, dial head one is located U-shaped mouth one, dial shaft one rotates and drives the shift fork up-and-down motion, thereby realize the preceding function of keeping off the gear.

The above prior art has many problems, first, the first control shaft and the first body are fixed, so that the first body is required to move only by driving the first body through the first control shaft, and since the first control shaft is required to move axially, the length of the first control shaft is required to be long, thereby resulting in:

1. the cost of the shifting fork is increased;

2. the whole thickness of the box body is thickened, and the cost is increased a lot;

3. the first control shaft needs to move, the first control shaft is in a suspended state in the shell, the shifting fork easily moves due to external force, and potential gear adjusting hazards exist.

In addition, the spring steel ball structure sets up on the box, leads to the box processing complicacy.

The present application is proposed to solve the above problems.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a gearbox shifting fork and a shell matched with the gearbox shifting fork.

The purpose of the invention can be realized by the following technical scheme:

the gearbox shifting fork is characterized by comprising a second body and a second control shaft, wherein the second body comprises a ring-shaped clamping ring portion, a through hole is formed in the second body, the second control shaft is inserted into the through hole, the second body can axially move on the second control shaft, the second body is further provided with a convex shifting head II, the shifting fork further comprises a limiting structure, and the limiting structure can enable the second body to be located at least two positions on the second control shaft in the axial direction.

The clamping ring portion is clamped on the second sliding sleeve, the second body and the second control shaft in the shifting fork are of a split movable structure, the second body is directly controlled to move to achieve a gear switching function, two positions of the control shaft are kept unchanged all the time in the switching process, namely two ends of the second control shaft are limited by the shell, and therefore the second control shaft can be prevented from being suspended through the movable structure of the control shaft, the stability of the second control shaft is guaranteed, and steering action is directly acted on the second body. In addition, this kind of movable structure of components of a whole that can function independently still makes the length of control shaft two reduce, has reduced the cost of control shaft two to because the reduction of control shaft two length and two ends of control shaft are all supported and lean on spacingly, make the whole thickness of casing also reduce, and then the cost of casing also reduces. The effect of shifting block two is acted on by shifting shaft two, and then drive body two motions, limit structure also exists among prior art, limit structure's effect can realize axial positioning to a certain extent after the motion of body two, prevent to take place the axial float, limit structure also can be convenient for the shift fork to realize quick location simultaneously, carry out the fast position switch of keeping off the position, in addition, this scheme is different from the background art, the design of integrating limit structure in the shift fork has been adopted, make originally need process the structure in the box shift to body two on, make box processing convenient, make the structure more compact simultaneously. The second body is provided with at least two positioning positions of a reverse gear position and a forward gear position on the second control shaft.

In the gearbox shifting fork, the limiting structure comprises a spring, a steel ball, a limiting cap and a plurality of limiting grooves II, and when the spring is bounced open, the steel ball is matched with the limiting grooves II.

When the body moves, the steel ball is withdrawn by the axial force, the spring is compressed, after the second body moves, the steel ball resets and enters the second limiting groove again to achieve limiting, the spring also resets at the moment, and the limiting cap is used for limiting the movement of one end of the spring. In actual production, the limiting structure can be a similar structure and is within the protection range of the scheme.

In the gearbox shifting fork, the limiting grooves are formed in the outer wall of the second control shaft at intervals, the second body is provided with an installation channel, the outer end of the installation channel penetrates through the second shifting block, the inner end of the installation channel penetrates through the through hole, the spring and the steel ball are located in the installation channel, and the limiting cap is fixed at the outer end of the installation channel.

The mounting channel passes through the second shifting block, the existing structure is fully utilized, the second shifting block structure is hollow, the weight of the second body is reduced, the cost is reduced, and the spring and the steel ball are mounted. In general, the number of the limiting grooves can be three, and the limiting grooves correspond to a forward gear, a neutral gear and a reverse gear respectively.

In the gearbox shifting fork, the limiting cap is in threaded connection with the outer end of the mounting channel.

The outer end of the mounting channel is provided with an internal thread, the limiting cap is provided with an external thread, and the limiting cap and the mounting channel are connected through threaded connection.

In the gearbox shifting fork, the longitudinal section profile of the second limiting groove is arc-shaped.

The longitudinal section of the second limiting groove is a section along the direction of the two axial lines of the control shaft, and the profile of the section is matched with the steel ball, so that the steel ball can be clamped in better.

The utility model provides a casing, includes casing and lower casing, go up casing and lower casing lock of lock each other, its characterized in that: the lower shell is internally provided with a first positioning seat for inserting and positioning one end of the second control shaft, the upper shell is internally provided with a second positioning seat for inserting and positioning the other end of the second control shaft, and the first positioning seat and the second positioning seat enable the second control shaft to be axially fixed.

The casing is the box among the background art, in the scheme among the background art, because control shaft one needs overall motion, consequently control shaft one length will be less than last box and the distance between the box down, and two ends of this shift fork body two are direct to be positioned on positioning seat one and positioning seat, have realized two axial complete positionings of control shaft, consequently reduced the thickness between last casing and the lower casing to make two gear shift operations of shift fork body operate steadily.

In the shell, the upper shell is further provided with a mounting hole, the mounting hole is rotatably connected with a second shifting shaft, the second shifting shaft is provided with a second U-shaped opening, and when the upper shell and the lower shell are buckled, the second shifting head enters the second U-shaped opening.

In the scheme that the background art mentioned, its shift fork is installed in last box, and dial a axle and also install in last box, and shift fork and dial an axle realize the installation in same box, as shown in the figure, the installation is very loaded down with trivial details, need consider the corresponding relation of dial one and U-shaped mouth one, still need consider the cooperation relation between shift fork and sliding sleeve one, consequently need satisfy these two position matching relations simultaneously, just can accomplish the assembly, very troublesome in actual operation, the assembly of being not convenient for. In this scheme, the shift fork is installed in the casing down, and the second shifting shaft is located the upper casing, and after the shift fork installation, only need the orientation of adjustment U-shaped mouth two, last casing and casing lock back down, the U-shaped mouth two is direct just can correspond the matching with the shifting block two, accomplishes the assembly fast, and structural design is ingenious.

Compared with the prior art, this gearbox shift fork and rather than complex casing have following advantage:

1. the gearbox shifting fork can avoid the suspension of the second control shaft through the movable structure of the control shaft, ensures the stability of the second control shaft and enables the steering action to directly act on the second body.

2. This gearbox shift fork still makes the length reduction of control shaft two through the movable structure of control shaft components of a whole that can function independently, has reduced the cost of control shaft two to because the reduction of control shaft two length and two ends of control shaft are all to leaning on spacing, make the whole thickness of casing also reduce, and then the cost reduction of casing.

3. This gearbox shift fork has adopted the design of integrating limit structure in the shift fork, makes originally need to process on the structure of in the box shifts to the body two, makes the box processing convenient, makes shift fork structure more compact simultaneously.

4. The mounting channel in the gearbox shifting fork runs through the second shifting block, the existing structure is fully utilized, the second shifting block structure is hollow, the weight of the second body is reduced, the cost is reduced, and the spring and the steel ball are mounted.

5. The double-end axial fixation of the second control shaft is realized by the design of the first positioning seat and the second positioning seat of the shell, the thickness between the upper shell and the lower shell is reduced, and the second shifting fork body is stable in shifting operation.

6. This casing only needs the orientation of adjusting U-shaped mouth two through installing the design of shift fork and dial axle two respectively at last casing and lower casing, and at last casing and casing lock back down, U-shaped mouth two is direct just can correspond with shifting block two and match, accomplishes the assembly fast, and structural design is ingenious.

Drawings

Fig. 1 is a schematic structural view of a shift fork and an upper case assembly in the background art.

Fig. 2 is a schematic structural diagram of the upper case assembly in the background art without a shifting fork.

Fig. 3 is a schematic structural view of a shift fork in the related art.

FIG. 4 is a perspective view of the transmission fork.

FIG. 5 is a structural cross-sectional view of the present transmission fork.

Fig. 6 is a structural perspective view of a lower housing assembly in the housing.

Fig. 7 is a perspective view of the structure of the lower housing assembly in the housing (with the second shaft removed).

Fig. 8 is a perspective view of the structure of the upper housing assembly in the housing.

List of reference numerals

In the figure, 1, a first body;

1a, a first shifting block;

2. a first control shaft;

2a, a first limiting groove;

3. an upper box body;

3a, a penetrating seat;

4. steel balls;

5. a spring;

6. a first dial shaft;

7. a first U-shaped opening;

8. a second body;

8a, a collar portion;

8b, punching;

8c, a second shifting block;

8d, installing a channel;

9. a second control shaft;

9a, a second limiting groove;

10. a first sliding sleeve;

11. a second sliding sleeve;

12. a limiting cap;

13. an upper housing;

13a, a second positioning seat;

13b, mounting holes;

14. a lower housing;

14a, a first positioning seat;

15. a second dial shaft;

15a and a second U-shaped opening.

Detailed Description

As shown in fig. 4 to 8, the transmission shifting fork comprises a second body 8 and a second control shaft 9, the second body 8 comprises a ring-shaped collar part 8a, a through hole 8b is formed in the second body 8, the second control shaft 9 is inserted into the through hole 8b, the second body 8 can axially move on the second control shaft 9, a second convex shifting head 8c is further arranged on the second body 8, and the shifting fork further comprises a limiting structure which can enable the second body to be positioned at least two positions in the axial direction of the second control shaft 9. The function of the clamping ring part 8a is clamped on the second sliding sleeve 11, the second body 8 and the second control shaft 9 in the shifting fork are of split movable structures, the second body 8 is directly controlled to move to achieve a gear switching function, the position of the second control shaft 9 is always kept unchanged in the switching process, namely, two ends of the second control shaft 9 are limited by the shell, therefore, the hanging of the control shaft can be avoided through the movable structure of the control shaft, the stability of the second control shaft 9 is guaranteed, and the steering action is directly acted on the second body 8. In addition, the split movable structure also reduces the length of the second control shaft 9, reduces the cost of the second control shaft 9, and reduces the overall thickness of the shell and the cost of the shell because the length of the second control shaft 9 is reduced and the two ends of the second control shaft 9 are both abutted and limited. The effect of shifting block two 8c is acted on by two 15 of dial shaft, and then drive two 8 movements of body, limit structure also exists among the prior art, limit structure's effect can realize axial positioning to a certain extent after the two 8 movements of body, prevent to take place the axial float, limit structure also can be convenient for the shift fork to realize quick location simultaneously, carry out fast and keep off the position switching, in addition, this scheme is different from the background art, the design of integrated limit structure in the shift fork has been adopted, make originally need process the structure of in the box shift to body two 8, make box processing convenient, make the structure more compact simultaneously. The second body 8 has at least two positioning positions of a reverse gear position and a forward gear position on the second control shaft 9.

Specifically, the limiting structure comprises a spring 5, a steel ball 4, a limiting cap 12 and a plurality of limiting grooves 9a, and when the spring 5 is bounced open, the steel ball 4 is matched with the limiting grooves 9 a. When the body moves, the steel ball 4 is withdrawn by the axial force, the spring 5 is compressed, after the second body 8 moves, the steel ball 4 resets and enters the second limiting groove 9a again to achieve limiting, at the moment, the spring 5 also resets, and the limiting cap 12 is used for limiting the movement of one end of the spring 5. In actual production, the limiting structure can be a similar structure and is within the protection range of the scheme. Spacing groove two 9a is seted up on the second 9 outer walls of control shaft at the interval, has seted up installation passageway 8d on the second 8 of body, and the second 8c of shifting block is run through to installation passageway 8d outer end, and the inner of installation passageway 8d runs through to perforation 8b, and spring 5 and steel ball 4 are located installation passageway 8d, and spacing cap 12 is fixed in installation passageway 8d outer end. The mounting channel 8d passes through the second shifting block 8c, the existing structure is fully utilized, the second shifting block 8c is hollow, the weight of the second body 8 is reduced, the cost is reduced, and the spring 5 and the steel ball 4 are mounted. In general, the number of the second limit grooves 9a may be three, and the three limit grooves correspond to a forward gear, a neutral gear and a reverse gear, respectively. The stopper cap 12 is screwed to the outer end of the mounting passage 8 d. The outer end of the mounting channel 8d is provided with internal threads, the limit cap 12 is provided with external threads, and the connection between the limit cap 12 and the mounting channel 8d is realized through threaded connection. The longitudinal section profile of the second limit groove 9a is arc-shaped. The longitudinal section of the second limiting groove 9a is a section along the axial direction of the second control shaft 9, and the profile of the section is matched with the steel ball 4, so that the steel ball 4 can be clamped in better.

The shell matched with the shifting fork comprises an upper shell 13 and a lower shell 14, the upper shell 13 and the lower shell 14 can be locked in a buckling mode, a first positioning seat 14a for inserting and positioning one end of the second control shaft 9 is arranged in the lower shell 14, a second positioning seat 13a for inserting and positioning the other end of the second control shaft 9 is arranged in the upper shell 13, and the first positioning seat 14a and the second positioning seat 13a enable the second control shaft 9 to be axially fixed. The casing is the box in the background art, in the scheme in the background art, because control shaft 2 needs the bulk motion, consequently control shaft 2 length will be less than the distance between last box 3 and the lower box, and this second 8 control shaft of shift fork body two 9 both ends are direct to be located on positioning seat 14a and positioning seat, have realized second 9 axial of control shaft and have been fixed a position completely, consequently reduced the thickness between last casing 13 and the lower casing 14 to make second 8 shift fork body shift operation operate steadily.

The upper shell 13 is further provided with a mounting hole 13b, the mounting hole 13b is rotatably connected with a second shifting shaft 15, the second shifting shaft 15 is provided with a second U-shaped opening 15a, and when the upper shell 13 and the lower shell 14 are buckled, the second shifting head 8c enters the second U-shaped opening 15 a. In the scheme that the background art mentioned, its shift fork is installed in last box 3, and dialling a axle 6 also installs in last box 3, and shift fork and dialling an axle 6 realize the installation in same box, as shown in the figure, the installation is very loaded down with trivial details, need consider the corresponding relation of dialling first 1a and U-shaped mouth 7, still need consider the cooperation relation between shift fork and sliding sleeve 10, consequently need satisfy these two position matching relations simultaneously, just can accomplish the assembly, very troublesome in actual operation, be not convenient for assemble. In the scheme, the shifting fork is installed in the lower shell 14, the second shifting shaft 15 is located in the upper shell 13, after the shifting fork is installed, only the orientation of the second U-shaped opening 15a needs to be adjusted, after the upper shell 13 and the lower shell 14 are buckled, the second U-shaped opening 15a can be directly matched with the second shifting block 8c correspondingly, assembly is completed quickly, and the structural design is ingenious.

Details, structures, dimensions and principles not mentioned in the present application are all known in the art or can be obtained by simple selection of those skilled in the art, and are not described in detail.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (7)

1. The gearbox shifting fork is characterized by comprising a second body and a second control shaft, wherein the second body comprises a ring-shaped clamping ring portion, a through hole is formed in the second body, the second control shaft is inserted into the through hole, the second body can axially move on the second control shaft, the second body is further provided with a convex shifting head II, the shifting fork further comprises a limiting structure, and the limiting structure can enable the second body to be located at least two positions on the second control shaft in the axial direction.

2. The transmission shift fork according to claim 1, wherein the limiting structure comprises a spring, a steel ball, a limiting cap and a plurality of second limiting grooves, and when the spring is bounced open, the steel ball is matched with the second limiting grooves.

3. The gearbox shifting fork according to claim 2, wherein the limiting grooves are formed in the outer wall of the second control shaft at intervals, a mounting channel is formed in the second body, the outer end of the mounting channel penetrates through the second shifting block, the inner end of the mounting channel penetrates through the through hole, the spring and the steel ball are located in the mounting channel, and the limiting cap is fixed to the outer end of the mounting channel.

4. The transmission shifter fork of claim 3, wherein the limit cap is threaded to the outer end of the mounting channel.

5. The gearbox shift fork of claim 2, wherein the longitudinal cross-sectional profile of the second detent pocket is arcuate.

6. A housing to be fitted with the transmission shifter fork of claim 1 or 2 or 3 or 4 or 5, comprising an upper housing and a lower housing, which can be locked to each other by snap fit, characterized in that: the lower shell is internally provided with a first positioning seat for inserting and positioning one end of the second control shaft, the upper shell is internally provided with a second positioning seat for inserting and positioning the other end of the second control shaft, and the first positioning seat and the second positioning seat enable the second control shaft to be axially fixed.

7. The shell of claim 6, wherein the upper shell is further provided with a mounting hole, the mounting hole is rotatably connected with a second shifting shaft, the second shifting shaft is provided with a second U-shaped opening, and when the upper shell and the lower shell are buckled, the second shifting head enters the second U-shaped opening.

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