Shifting fork supporting device

Abstract

The utility model relates to a shifting fork supporting device, which is used for supporting a shifting fork for a pull plate box on a gearbox shell and solves the technical problems that the structure of the gearbox shell is complicated, the machining process is increased, the air tightness and the shell strength of a gearbox are influenced, the machining difficulty is higher and the maintenance is inconvenient in the prior art. The shifting fork comprises at least two shifting forks with U-shaped structures, sliding sleeve connecting pieces are arranged on fork feet, and a pulling plate connecting piece is arranged on an arc; a fork foot of the gear shifting fork is provided with a shifting fork swinging column; the two long-strip-shaped shifting fork fixing plates are arranged on the two sides of the gear shifting fork correspondingly, the two ends of each long-strip-shaped shifting fork fixing plate are provided with connecting pieces connected with a front partition plate and a rear partition plate in a gearbox shell, the shifting fork supporting device is clamped to a gearbox, and it is avoided that supporting pin threaded holes are formed in the outer contour of the gearbox shell. The device can replace an existing shifting fork supporting pin structure which is fixed to the shell in a threaded connection mode.

Description

Technical Field

[0001] The utility model relates to a shift fork for a pull box, in particular to a shift fork supporting device, which is used for supporting the shift fork for the pull box on a gearbox housing. Background Art

[0002] The shift fork for the pull plate box is an important component in the gearbox, which is used to connect the shift shaft to achieve gear shifting. In the prior art, the shift fork for the pull plate box is generally used in combination with the shift fork support pin on the gearbox housing. For example, the Chinese patent with the publication number CN212155757 U and the name of a pull plate type shift fork group belongs to the aforementioned structure, which includes a column pin, a shift fork, a shift fork block and a support pin; the shift fork is a U-shaped opening structure, and the shift fork feet on both sides of the U-shaped opening are relatively provided with a shift fork block connecting through hole and a support pin connecting through hole; one end of the column pin is fixedly set on the arc part of the shift fork, and the other end is spherical and plugged with the pull plate. Its working principle is: the shift fork support pin is threadedly connected to the support pin threaded hole opened on the outer contour of the transmission housing, and the fork foot fulcrum is formed by cooperating with the support pin connecting through hole on the shift fork to make it swing back and forth; the pull plate moves to drive the column pin, and the shift fork rotates with the support pin as the center, so that the shift fork block drives the sliding sleeve to slide to achieve gear shifting.

[0003] However, the above scheme has some problems in practical application, especially for aluminum alloy gearbox housing. Opening a support pin threaded hole for installing the shift fork support pin on the outer contour of the gearbox housing will make (1) the structure of the gearbox housing complicated, increase the machining process, and increase the processing cost; (2) the air tightness and housing strength of the gearbox are affected, which in turn leads to the hidden danger of oil and gas leakage in the gearbox; (3) the gearbox has strict requirements on the coaxiality of the two corresponding support pin threaded holes for installing the same shift fork, and the processing accuracy requirements are high, which is difficult to process. In addition, the shift fork needs to be disassembled when the gearbox housing is repaired. The use of the shift fork support pin design will result in a high maintenance cost. After multiple repairs, there is a problem of thread stripping, which makes maintenance inconvenient. Utility Model Content

[0004] The utility model aims to solve the technical problems that the prior art makes the structure of the gearbox housing complicated, increases the machining process, affects the air tightness of the gearbox and the strength of the housing, is difficult to process, and is inconvenient to repair, and provides a shift fork support device.

[0005] In order to achieve the above purpose, the technical solutions provided by the utility model are as follows:

[0006] A shift fork supporting device comprises a shift fork group, the shift fork group comprises at least three shift forks of different gears, the shift fork is a U-shaped structure, the fork legs on both sides of the U-shaped opening are provided with corresponding sliding sleeve connectors for connecting with the sliding sleeve, and the U-shaped arc is provided with a pull plate connector for connecting with the pull plate;

[0007] Its special features are:

[0008] It also includes two shift fork fixing plates respectively arranged on both sides of the shift fork group, a first connecting member arranged at one end of the two shift fork fixing plates, and a second connecting member arranged at the other end of the two shift fork fixing plates; the first connecting member is used to be connected to the front bulkhead of the gearbox housing, and the second connecting member is used to be fixedly connected to the rear bulkhead of the gearbox housing, and is used to replace the support pin threaded hole opened on the outer contour of the gearbox housing, so as to ensure the integrity of the gearbox housing and avoid the problem of oil leakage and air leakage of the gearbox housing due to drilling;

[0009] The shift fork fixing plate is a long strip plate, and its length is greater than the working length of the shift fork group. The working length refers to the distance from one side to the other side of the maximum swing range of the shift fork group.

[0010] A shift fork swing column is respectively arranged on the two fork legs of each shift fork, and a shift fork mounting hole corresponding to the shift fork swing column is arranged on the shift fork fixing plate.

[0011] Furthermore, the fork swing column and the sliding sleeve connecting piece on the same side of each shift fork are arranged in sequence from inside to outside along the side fork leg, the sliding sleeve connecting piece is located at the end of the side fork leg, and the swing direction of the shift fork is opposite to the moving direction of the pull plate.

[0012] Furthermore, the sliding sleeve connector and the fork swing column on the same side of each shift fork are arranged in sequence from inside to outside along the side fork leg, the fork swing column is located at the end of the side fork leg, and the swing direction of the shift fork is the same as the moving direction of the pull plate.

[0013] Furthermore, the first connecting member is a mounting flat pin, which is used to connect with a mounting hole corresponding to the front bulkhead of the gearbox housing, or a mounting hole having a blind hole structure corresponding to the front end of the gearbox housing;

[0014] The second connecting member is a mounting groove, which cooperates with the mounting card plate and the rear partition plate of the gearbox housing. The mounting card plate is fixed to the shift fork fixing plate by being clamped in the mounting groove, so as to reduce the difficulty of assembly and disassembly;

[0015] The mounting card is provided with mounting screws, and the mounting screws are used to fix the mounting card to the rear partition of the gearbox housing.

[0016] Further, the mounting groove is a rectangular groove;

[0017] The mounting card plate is provided with a corresponding rectangular groove at a connection position with the mounting groove.

[0018] Furthermore, the shift fork swing column is provided with support plates along the inner and outer directions of the fork legs of the shift fork, respectively, for increasing the strength of the shift fork swing column.

[0019] Furthermore, the mounting card plate is a rectangular plate with chamfers at its four corners.

[0020] Furthermore, there are two mounting screws on each mounting card, and the mounting direction is toward the shift fork assembly, which is used to reduce the difficulty of installation and strengthen the strength of the connection between the mounting card and the rear partition of the transmission housing.

[0021] Furthermore, the shift fork group includes four shift forks.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] 1. The utility model provides a shift fork supporting device. Through the design of a shift fork fixing plate, two left-right symmetrical shift fork fixing plates are used to support the shift fork for a pull box. The two shift fork fixing plates are respectively fixed to the front and rear partitions located inside the gearbox housing through mounting clamps, thereby realizing shift fork support, simplifying the structure of the gearbox housing, avoiding the problem of oil and air leakage caused by the complication of the structure of the gearbox housing due to the opening of a support pin threaded hole, and ensuring the air tightness of the gearbox and the housing strength.

[0024] 2. The utility model provides a shift fork supporting device, in which the shift fork fixing plate and the mounting clamping plate arranged thereon are both symmetrically designed, with high parts interchangeability, low processing cost, low inventory cost, simple structure and low assembly difficulty.

[0025] 3. The utility model provides a shift fork support device, which can be processed and manufactured by using a formed plate blank, and the drilling process is relatively convenient, and the processing accuracy of the installation hole is relatively high. Instead of setting a supporting pin connection through hole on the shift fork, a shift fork swing column is set, and the processing method is changed from drilling to turning the outer circle, which is convenient for processing.

[0026] 4. The utility model provides a shift fork support device, which uses a design of mounting flat pins and mounting grooves plus mounting card plates. The positioning of the shift fork fixing plate is ensured by mounting flat pins on the outer circle of the vehicle, and the entire device is clamped inside the gearbox housing by mounting grooves plus mounting card plates, thereby improving the reliability of the shift fork support device and reducing the difficulty and cost of gearbox maintenance. In addition, when the number of shift forks increases, it is only necessary to increase the length of the shift fork fixing plate and punch holes, and there is no need to punch holes in the original gearbox housing.

[0027] 5. The fork support device provided by the utility model can replace the existing fork support pin structure that is fixed to the housing by threaded connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of a fork supporting device of the utility model;

[0029] Figure 2 This is a front view of an embodiment of a fork support device of the utility model;

[0030] Figure 3 It is an exploded schematic diagram of an embodiment of a shift fork support device of the utility model;

[0031] Figure 4 The utility model is a schematic assembly diagram of a fork support device embodiment.

[0032] The figure numbers are explained as follows: 1-shift fork fixing plate, 101-first connecting member, 102-second connecting member; 2-mounting card plate; 3-shift fork assembly; 4-mounting screws; 5-shift fork swing column, 501-support plate; 6-pull plate connecting member; 7-sleeve connecting member. DETAILED DESCRIPTION

[0033] The specific technical solutions in the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0034] See also Figure 1-3 , a shift fork supporting device, comprising a mounting card plate 2, a shift fork group 3, four mounting screws 4, two shift fork fixing plates 1 respectively arranged on both sides of the shift fork group 3, a first connecting member 101 arranged at one end corresponding to the two shift fork fixing plates 1, and a second connecting member 102 arranged at the other end corresponding to the two shift fork fixing plates 1;

[0035] The first connecting member 101 is a mounting flat pin 101, and the second connecting member 102 is a mounting groove 102;

[0036] The shift fork group 3 includes four shift forks of different gears. The shift fork is a U-shaped structure. The fork legs on both sides of the U-shaped opening are provided with corresponding sleeve connectors 7 for connecting with the sleeve, and the U-shaped arc is provided with a pull plate connector 6 for connecting with the pull plate.

[0037] The two fork legs of each shift fork are respectively provided with a shift fork swing column 5, and the shift fork fixing plate 1 is provided with a shift fork mounting hole corresponding to the shift fork swing column 5;

[0038] The shift fork swing column 5 and the sliding sleeve connecting member 7 on the same side of each shift fork are arranged in sequence from the inside to the outside along the fork leg on that side, and the sliding sleeve connecting member 7 is located at the end of the fork leg on that side, and the swing direction of the shift fork is opposite to the moving direction of the pull plate;

[0039] The shift fork fixing plate 1 is a long strip plate, and its length can accommodate the working length of the shift fork group 3. The working length refers to the distance from one side to the other side of the maximum swing range of the shift fork group 3.

[0040] A mounting hole is provided at the top of the front bulkhead of the gearbox housing; in other embodiments of the present invention, the mounting hole may also be a blind hole provided at the front end of the gearbox housing, and the mounting hole can be used to fix the mounting flat pin 101 inside the gearbox;

[0041] A positioning hole is provided on the top of the rear partition of the gearbox housing;

[0042] The front end of the mounting flat pin 101 is an outer circular structure, and is used to connect with the mounting hole corresponding to the front bulkhead of the gearbox housing;

[0043] The mounting card plate 2 is a rectangular plate with chamfers at its four corners;

[0044] The mounting groove 102 is a rectangular groove; the mounting card 2 is provided with a corresponding rectangular groove at the connection position with the mounting groove 102; the mounting card 2 is fixedly connected with the mounting groove 102 through the corresponding rectangular groove thereon;

[0045] The mounting groove 102 cooperates with the positioning hole of the rear partition of the gearbox housing, and the mounting clamping plate 2 is clamped in the mounting groove 102 to fix the shift fork fixing plate 1;

[0046] Four mounting screws 4 are arranged in pairs on the two mounting clamps 2, the two mounting clamps 2 are fixed to the rear partition of the gearbox housing, and the entire fork support device is clamped inside the gearbox housing. In this embodiment, the swing fulcrum of the shift fork for swinging forward and backward for shifting gears is moved from the shift fork support pin installed on the gearbox housing to the shift fork fixing plate. During assembly, it is only necessary to reliably and stably install the shift fork fixing plate on the gearbox housing.

[0047] In the fork supporting device, the fork fixing plate 1 is a long strip plate, and its length is greater than the working length of the shift fork group 3; the mounting clamping plate 2 is a rectangular plate with chamfers, and the chamfers are used to prevent scratches on other parts and operators during assembly.

[0048] The working principle of the fork support device is as follows:

[0049] See also Figure 4The left-right symmetrical shift fork fixing plate 1 has a mounting flat pin 101 of a flat pin structure processed into an outer circle at the front end, which is installed in cooperation with the mounting hole of the front partition of the gearbox housing; a rectangular mounting groove 102 is opened at its rear end, which is installed in cooperation with the rectangular groove on the mounting card plate 2, and the mounting card plate 2 realizes axial and circumferential limiting of the shift fork fixing plate. At the same time, a countersunk hole is opened on the mounting card plate 2, and the card plate is fixed to the rear partition of the gearbox housing by two hexagonal countersunk mounting screws 4; four shift fork mounting holes are processed on the shift fork fixing plate 1, which are respectively matched with the shift fork swinging columns 5 on the shift forks of different gears in the shift fork group 3. When engaging gears, the shift fork swings back and forth with the shift fork swinging column 5 as the hinge center, and the fork foot of the shift fork moves the sliding sleeve to complete the gear engagement.

[0050] The above description is only an embodiment of the present utility model and is not intended to limit the protection scope of the present utility model. Any equivalent structural transformation made using the contents of the present utility model specification and drawings, or directly or indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A shift fork supporting device, comprising a shift fork assembly (3), the shift fork assembly (3) comprising at least three shift forks of different gear positions, the shift fork being a U-shaped structure, the fork legs on both sides of the U-shaped opening being provided with corresponding sliding sleeve connectors (7) for connecting with the sliding sleeve, and the U-shaped arc being provided with a pull plate connector (6) for connecting with the pull plate; Features: It also comprises two shift fork fixing plates (1) respectively arranged on both sides of the shift fork assembly (3), a first connecting member (101) arranged at one corresponding end of the two shift fork fixing plates (1), and a second connecting member (102) arranged at the other corresponding end of the two shift fork fixing plates (1); the first connecting member (101) is used to be connected to the front partition plate of the gearbox housing, and the second connecting member (102) is used to be fixedly connected to the rear partition plate of the gearbox housing; The shift fork fixing plate (1) is a long strip-shaped plate, the length of which is greater than the working length of the shift fork group (3), wherein the working length refers to the distance from one side to the other side of the maximum swing range of the shift fork group (3); A fork swing column (5) is respectively provided on the two fork legs of each shift fork, and a fork mounting hole corresponding to the fork swing column (5) is provided on the shift fork fixing plate (1).

2. A fork support device according to claim 1, characterized in that: The fork swing column (5) and the sliding sleeve connecting member (7) on the same side of each shift fork are arranged in sequence from the inside to the outside along the side fork leg, and the sliding sleeve connecting member (7) is located at the end of the side fork leg. The swing direction of the shift fork is opposite to the moving direction of the pull plate.

3. A fork support device according to claim 1, characterized in that: The sliding sleeve connecting member (7) and the fork swinging column (5) on the same side of each shift fork are arranged in sequence from the inside to the outside along the side fork foot, the fork swinging column (5) is located at the end of the side fork foot, and the swinging direction of the shift fork is the same as the moving direction of the pull plate.

4. A fork support device according to any one of claims 1 to 3, characterized in that: The first connecting member (101) is a mounting flat pin, which is used to connect with a mounting hole corresponding to a front bulkhead of a gearbox housing, or a mounting hole having a blind hole structure corresponding to a front end of the gearbox housing; The second connecting member (102) is a mounting groove, the mounting groove cooperates with the mounting clamping plate (2) and the rear partition plate of the gearbox housing, and the mounting clamping plate (2) fixes the shift fork fixing plate (1) by being clamped in the mounting groove; The mounting card plate (2) is provided with mounting screws (4), and the mounting screws (4) are used to fix the mounting card plate (2) to the rear partition plate of the gearbox housing.

5. A fork support device according to claim 4, characterized in that: The mounting groove is a rectangular groove; The mounting card plate (2) is provided with a corresponding rectangular groove at a connection position with the mounting groove.

6. A fork support device according to claim 5, characterized in that: The shift fork swing column (5) is provided with support plates (501) respectively along the inner and outer directions of the fork legs of the shift fork, so as to increase the strength of the shift fork swing column (5).

7. A fork support device according to claim 6, characterized in that: The mounting card plate (2) is a rectangular plate, and its four corners are provided with chamfers.

8. A fork support device according to claim 7, characterized in that: There are two mounting screws (4) on each mounting card plate (2), and the mounting direction is toward the shift fork assembly (3).

9. A fork support device according to claim 8, characterized in that: The shift fork group (3) comprises four shift forks.

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