A fork bush press-fitting multi-fitting missing-fitting error prevention method and press-fitting device

Abstract

The application belongs to the field of fork assembly manufacturing, in particular to a fork bushing press-fitting multi-loading and missing loading mistake proofing method and a press-fitting device, comprising the following steps: 1) setting a first airflow channel and a second airflow channel on a press-fitting rod; 2) measuring the flow rates A1 and A2 in the first airflow channel and the second airflow channel when no bushing is sleeved on the press-fitting rod; 3) setting a flow rate value A11 less than the flow rate A1 and greater than 0 and a flow rate value A22 less than the flow rate A2 and greater than 0 respectively when in use, measuring the flow rate B through the first airflow channel 2 and the flow rate C in the second airflow channel 4; comparing the flow rate value A11 with the measured flow rate value B, and then comparing the flow rate value A22 with the measured flow rate value C, so as to determine whether the bushing is over-loaded or under-loaded.

Description

Technical Field

[0001] This application belongs to the field of shift fork assembly manufacturing, specifically a method and press-fitting device for preventing over-installation and under-installation of shift fork bushings. Background Technology

[0002] The product consists of a shift fork and bushings. The shift fork is positioned using an outer sleeve and auxiliary fork angle positioning, and the bushings are pressed in by a pressure rod. Because a bushing needs to be pressed into both ends of the shift fork, this method has the following disadvantages:

[0003] 1. The bushing may be missing from one end of the shift fork;

[0004] 2. An extra bushing will be press-fitted onto one end of the shift fork;

[0005] 3. Press an extra bushing onto each end of the shift fork. Summary of the Invention

[0006] The purpose of this application is to address the shortcomings of existing technologies by designing a method and presser for preventing over-installation and under-installation of shift fork bushings by setting an airflow channel on the press rod. This method not only prevents the risk of under-installation of the bushing at one end of the mounting hole on the shift fork, but also eliminates the phenomenon of over-installation at both ends of the mounting hole on the shift fork, thus solving the problem of how to prevent over-installation and under-installation of bushings when pressing bushings on the shift fork.

[0007] To achieve the above objectives, the technical solution adopted in this application is:

[0008] A method for preventing over-installation and under-installation of shift fork bushings includes the following steps:

[0009] 1) A first airflow channel and a second airflow channel are provided on the press rod. The air outlets of the first airflow channel and the second airflow channel are both located on the circumferential surface of the press rod. The distance from the air outlet of the first airflow channel to the press end of the press rod is less than the axial length of the bushing being press-fitted. The distance from the air outlet of the second airflow channel to the press end of the press rod is greater than the axial length of one bushing being press-fitted and less than the sum of the axial lengths of two bushings being press-fitted.

[0010] 2) Measure the flow rates A1 and A2 in the first and second airflow channels when the bushing is not fitted on the press rod;

[0011] 3) During use, set a flow rate value A11 that is less than the flow rate A1 but greater than 0 and a flow rate value A22 that is less than the flow rate A2 but greater than 0, respectively, and measure the flow rate B through the first airflow channel 2 and the flow rate C in the second airflow channel 4.

[0012] If the flow rate C in the second airflow channel is greater than the flow rate A22, it indicates that a bushing is missing; if the flow rate C in the second airflow channel is less than the flow rate A22 and the flow rate B in the first airflow channel is greater than A11, it indicates that neither too many nor too few bushings are installed; if the flow rate B in the first airflow channel and the flow rate C in the second airflow channel are less than the flow rate A11 and the flow rate A22, respectively, it indicates that an extra bushing is installed.

[0013] If you need to continue testing whether there are too many or too few bushings in the shift fork, you only need to repeat step 3).

[0014] Preferably, in step 3), the method for measuring the actual flow rate B in the first airflow channel and the actual flow rate C in the second airflow channel is to connect a pipe with a flow sensor to the air inlet of the first airflow channel and the air inlet of the second airflow channel, and then connect the flow sensor signal to the control system, and display the flow rate values ​​B and C on the display screen connected to the control system.

[0015] Preferably, in step 1), the air inlet of the first airflow channel and the air inlet of the second airflow channel are both located between the two ends of the pressing rod, and the distance from the air inlet of the first airflow channel to the pressing end of the pressing rod and the distance from the air inlet of the second airflow channel to the pressing end of the pressing rod are both greater than the depth of the mounting hole on the shift fork.

[0016] Preferably, in step 1), the pressing rod is provided with at least two first airflow channels and two second airflow channels. Each first airflow channel has an air inlet and an air outlet, and each second airflow channel has an air inlet and an air outlet. The air outlets of the first airflow channels and the air outlets of the second airflow channels are arranged in a circular array on the circumferential surface of the pressing rod.

[0017] Preferably, in step 3), the method for measuring the actual flow rate B passing through the first airflow channel is as follows: a flow valve is installed at the air inlet of the first airflow channel, the air inlet of the first airflow channel is connected to the air outlet of the flow valve, and the air inlet of the flow valve is connected to the air outlet of an external air source.

[0018] A shift fork bushing press-fitting device, the method of use of which includes the aforementioned method for preventing over-fitting and under-fitting of shift fork bushings; its structure includes a bracket, a worktable on the bracket, a vertical first cylinder positioned directly above the worktable, the piston rod of the first cylinder being fixedly connected to the press-fitting rod, a limiter for fixing the shift fork being positioned on the worktable corresponding to the lower part of the press-fitting rod, air pipe connectors being provided at the air inlet of the first airflow channel and the air inlet of the second airflow channel on the press-fitting rod, a through hole coaxial with the press-fitting rod being provided on the worktable, the inner diameter of the through hole being greater than or equal to the inner diameter of the bushing being press-fitted, and a support being positioned directly below the through hole. A vertically upward-facing second cylinder has a piston rod with a vertically mounted auxiliary pressure rod. The auxiliary pressure rod is coaxial with the through hole and also has a first airflow channel and a second airflow channel. Near the top of the circumference of the auxiliary pressure rod, there are also outlets for the first and second airflow channels on the auxiliary pressure rod. The distance between the outlet of the first airflow channel on the auxiliary pressure rod and the top of the auxiliary pressure rod is less than the axial length of one press-fitted bushing. The distance between the outlet of the second airflow channel on the auxiliary pressure rod and the top of the auxiliary pressure rod is greater than the axial length of one press-fitted bushing and less than the axial length of two press-fitted bushings.

[0019] Preferably, it further includes an auxiliary frame, which is slidably connected to the support, the sliding direction of the auxiliary frame is parallel to the worktable, the auxiliary frame is located below the worktable, the second cylinder is disposed on the auxiliary frame, and the through hole is located on the projection of the sliding path of the auxiliary frame on the worktable.

[0020] Compared with the prior art, this application has the following beneficial effects:

[0021] 1. This application adopts the method of setting airflow channels on the pressing rod to design a method and pressing device for preventing over-pressing and under-pressing of shift fork bushings. It not only prevents the risk of under-pressing of bushings at one end of the mounting hole on the shift fork, but also eliminates the phenomenon of over-pressing at both ends of the mounting hole on the shift fork, thus solving the problem of how to prevent over-pressing and under-pressing of bushings on the shift fork.

[0022] 2. This application makes the measured flow rate values ​​B and C more accurate by setting up multiple first airflow channels and second airflow channels.

[0023] 3. This application facilitates the installation or replacement of the second cylinder and the auxiliary pressure rod by setting up an auxiliary frame. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the shift fork bushing press-fitter in this application;

[0025] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 A schematic diagram of the shift fork and bushing;

[0027] Figure 4 This is a schematic diagram of the fork bushing press-fit device in this application, showing the press-fitting of the fork and bushing.

[0028] Figure 5 for Figure 4 A partial cross-sectional view;

[0029] Figure 6 A schematic diagram of the structure for installing the flow sensor in this application;

[0030] Figure 7 This is a cross-sectional view of the press-fit rod;

[0031] Figure 8 This is a cross-sectional view of the secondary compression member.

[0032] The components include: 1. Press rod; 2. First airflow channel; 3. Bushing; 4. Second airflow channel; 5. Flow sensor; 6. Flow valve; 7. Bracket; 8. Worktable; 9. First cylinder; 10. Limiter; 11. Shift fork; 12. Air pipe connector; 13. Through hole; 14. Second cylinder; 15. Secondary pressure rod; and 16. Auxiliary device. Detailed Implementation

[0033] like Figure 1-8 As shown, a method for preventing over-installation and under-installation of shift fork bushings includes the following steps:

[0034] 1) A first airflow channel 2 and a second airflow channel 4 are provided on the pressing rod 1. The air outlets of the first airflow channel 2 and the second airflow channel 4 are both located on the circumferential surface of the pressing rod 1. The distance from the air outlet of the first airflow channel 2 to the pressing end of the pressing rod is less than the axial length of the bushing being pressed. The distance from the air outlet of the second airflow channel 4 to the pressing end of the pressing rod is greater than the axial length of one bushing being pressed and less than the sum of the axial lengths of two bushings being pressed.

[0035] 2) Measure the flow rates A1 and A2 in the first airflow channel 2 and the second airflow channel 4 when the bushing 3 is not fitted on the press rod 1;

[0036] 3) During use, set a flow rate value A11 that is less than the flow rate A1 but greater than 0 and a flow rate value A22 that is less than the flow rate A2 but greater than 0, respectively, and measure the flow rate B through the first airflow channel 2 and the flow rate C in the second airflow channel 4.

[0037] If the flow rate C through the second airflow channel 4 is greater than the flow rate A22, it indicates that the bushing 3 is missing; if the flow rate C through the second airflow channel 4 is less than the flow rate A22 and the flow rate B through the first airflow channel 2 is greater than A11, it indicates that neither too many nor too few bushings 3 are installed; if the flow rate B through the first airflow channel 2 and the flow rate C through the second airflow channel 4 are less than the flow rate A11 and the flow rate A22, respectively, it indicates that too many bushings 3 are installed.

[0038] If you need to continue testing whether there are too many or too few bushings 3 in the shift fork 11, you only need to repeat step 3).

[0039] After this setup, before use, connect the air inlet of the press-fit rod 1 to an air source (in practical applications, the air source can be an air pump). When using, insert the press-fit rod 1 into the mounting hole of the shift fork 11. If the bushing 3 has already been press-fitted (installed) in the mounting hole, the flow rate C injected into the second airflow channel 4 will be less than the flow rate A22. This is because the flow rate injected into the second airflow channel 4 will flow out from the air outlet, and since the air outlet of the second airflow channel 4 is blocked by the bushing 3, the flow velocity (flow rate) is reduced. However, if the bushing is not press-fitted in the mounting hole... 3. If the airflow rate B injected into the first airflow channel 2 is greater than the airflow rate A11, then the airflow rate B injected into the second airflow channel 4 is greater than the airflow rate A22, because the air outlets of the first airflow channel 2 and the second airflow channel 4 are not blocked. If an extra bushing 3 is press-fitted (installed) into the mounting hole, the extra bushing 3 will block the air outlet of the first airflow channel 2, making it difficult to inject airflow into the first airflow channel 2. Therefore, the airflow rate B in the first airflow channel 2 is less than the airflow rate A12. This avoids the situation of missing or overfilling.

[0040] As a preferred method, in step 3), the actual flow rate B passing through the first airflow channel 2 and the actual flow rate C passing through the second airflow channel 4 are measured by connecting a pipe equipped with a flow sensor 5 to the air inlet of the first airflow channel 2 and the air inlet of the second airflow channel 4. The signals from the flow sensor 5 are then connected to the control system, and the flow rate values ​​B and C are displayed on a screen connected to the control system. This method, by sensing the airflow or velocity through the first airflow channel 2 and the second airflow channel 4 using the flow sensor 5, and then displaying the flow rate values ​​B and C, is convenient and intuitive.

[0041] As a preferred embodiment, in step 1), the air inlets of the first airflow channel 2 and the second airflow channel 4 are both located between the two ends of the pressing rod 1, and the distances from the air inlets of the first airflow channel 2 to the pressing end of the pressing rod 1 and the distances from the air inlets of the second airflow channel 4 to the pressing end of the pressing rod are both greater than the depth of the mounting holes on the shift fork 11. This ensures that the air inlets do not interfere with the connection between the pressing rod 1 and the drive device used to drive the pressing rod 1 to perform the pressing operation.

[0042] As a preferred embodiment, in step 1), the pressing rod 1 is provided with at least two first airflow channels 2 and two second airflow channels 4. Each first airflow channel 2 has an air inlet and an air outlet 4, and each second airflow channel 4 has an air inlet and an air outlet 4. The air outlets 4 of the first airflow channels 2 and the air outlets 4 of the second airflow channels 4 are arranged in a circular array on the circumferential surface of the pressing rod 1. By setting multiple first airflow channels 2 and second airflow channels 4, the measured flow rate values ​​B and C are more accurate.

[0043] As a preferred method, in step 3), the actual flow rate B passing through the first airflow channel 2 is measured by installing a flow valve 6 at the inlet of the first airflow channel 2. The inlet of the first airflow channel 2 is connected to the outlet of the flow valve 6, and the inlet of the flow valve 6 is connected to the outlet of an external air source. Measuring the flow rate of the airflow passing through the first airflow channel 2 using the flow valve 6 is convenient, and it must be installed at the inlet of the press-fit rod 1 because the outlet 4 of the press-fit rod 1 will at least partially extend into the bushing, so the flow valve 6 cannot be installed at the outlet 4.

[0044] A fork bushing press-fitter, such as Figure 1-6As shown, its usage method includes the above-mentioned method for preventing over-installation and under-installation errors in press-fitting shift fork bushings; its structure includes a bracket 7, on which a worktable 8 is provided. A vertical first cylinder 9 is provided directly above the worktable 8. The piston rod of the first cylinder 9 is fixedly connected to the press-fitting rod 1. A limiter for fixing the shift fork 11 is provided on the worktable 8 corresponding to the lower part of the press-fitting rod 1. Air pipe connectors 12 are provided at the air inlet of the first airflow channel 2 and the air inlet of the second airflow channel on the press-fitting rod 1. A through hole 13 coaxial with the press-fitting rod 1 is provided on the worktable 8. The inner diameter of the through hole 13 is greater than or equal to the inner diameter of the bushing 3 being press-fitted. A vertically upward second cylinder is provided on the bracket 7 directly below the through hole 13. 14. A secondary pressure rod 15 is vertically provided on the piston rod of the second cylinder 14. The secondary pressure rod 15 is coaxial with the through hole 13. The secondary pressure rod 15 is also provided with the first airflow channel 2 and the second airflow channel 4. Near the top of the circumference of the secondary pressure rod 15, there are also corresponding air outlets 4 of the first airflow channel 2 and the second airflow channel 4 on the secondary pressure rod 15. The distance between the air outlet 4 of the first airflow channel 2 on the secondary pressure rod 15 and the top of the secondary pressure rod 15 is less than the axial length of one press-fitted bushing 3. The distance between the air outlet of the second airflow channel 4 on the secondary pressure rod 15 and the top of the secondary pressure rod 15 is greater than the axial length of one press-fitted bushing 3 and less than the axial length of two press-fitted bushings 3.

[0045] In this embodiment, during use, the two bushings 3 are first inserted into the mounting holes from both ends. Then, the shift fork 11 is placed on the worktable 8, ensuring that the mounting hole on the shift fork 11 is coaxial (concentric) with the through hole 13. The shift fork 11 is then fixed in place by a limiter. Next, the first cylinder 9 and the second cylinder 14 are activated. The pressing rod 1 driven by the first cylinder 9 presses the bushing 3 located in the mounting hole from top to bottom, while the auxiliary pressing rod 15 driven by the second cylinder 14 presses the bushing 3 located in the mounting hole from bottom to top. After pressing, before the pressing rod 1 and the auxiliary pressing rod 2 extend into the mounting hole, air is introduced into the first airflow channel 2 and the second airflow channel 4. The airflow rate through the first airflow channel 2 and the airflow rate through the second airflow channel 4 are then observed to determine whether an extra or missing bushing has been installed. The air pipe connector 12 is used to connect to the outlet of an air source, which can be an air pump.

[0046] As a preferred embodiment, an auxiliary frame 16 is also included. The auxiliary frame 16 is slidably connected to the support 7, and the sliding direction of the auxiliary frame 16 is parallel to the worktable 8. The auxiliary frame 16 is located below the worktable 8, and the second cylinder 14 is mounted on the auxiliary frame 16. The through hole 13 is located on the projection of the sliding path of the auxiliary frame 16 onto the worktable. With this configuration, the auxiliary frame 16 facilitates the installation or replacement of the second cylinder 14 and the auxiliary pressure rod 15.

Claims

1. A method for preventing over-installation and under-installation errors in press-fitting of shift fork bushings, characterized in that, It employs a shift fork bushing press-fitter, and the method includes the following steps: 1) A first airflow channel (2) and a second airflow channel (4) are provided on the press rod (1). The air outlet of the first airflow channel (2) and the air outlet of the second airflow channel (4) are both located on the circumferential surface of the press rod (1). The distance from the air outlet of the first airflow channel (2) to the press end of the press rod is less than the axial length of the press-fitted bushing. The distance from the air outlet of the second airflow channel (4) to the press end of the press rod (1) is greater than the axial length of one press-fitted bushing (3) and less than the sum of the axial lengths of two press-fitted bushings (3). 2) Measure the flow rates A1 and A2 in the first airflow channel (2) and the second airflow channel (4) when the bushing (3) is not fitted on the press rod (1); 3) During use, set a flow rate value A11 that is less than the flow rate A1 but greater than 0 and a flow rate value A22 that is less than the flow rate A2 but greater than 0, respectively, and measure the flow rate B through the first airflow channel (2) and the flow rate C in the second airflow channel (4). If the flow rate C through the second airflow channel (4) is greater than the flow rate A22, it means that the bushing (3) is missing; if the flow rate C through the second airflow channel (4) is less than the flow rate A22 and the flow rate B through the first airflow channel (2) is greater than the value A11, it means that neither the bushing (3) is too many nor too few; if the flow rate B through the first airflow channel (2) and the flow rate C through the second airflow channel (4) are less than the flow rate A11 and the flow rate A22 respectively, it means that the bushing (3) is too many. If you need to continue testing whether there are too many or too few bushings (3) in the shift fork (11), you only need to repeat step 3). The shift fork bushing presser includes a bracket (7), on which a worktable (8) is provided. A vertical first cylinder (9) is provided directly above the worktable (8). The piston rod of the first cylinder (9) is fixedly connected to the press rod (1). A limiter for fixing the shift fork (11) is provided on the worktable (8) corresponding to the lower part of the press rod (1). Air pipe connectors (12) are provided at the air inlet of the first airflow channel (2) on the press rod (1) and at the air inlet of the second airflow channel on the press rod (1). A through hole (13) coaxial with the press rod (1) is provided on the worktable (8). The inner diameter of the through hole (13) is greater than or equal to the inner diameter of the bushing (3) being pressed. A vertically upward second cylinder (14) is provided on the bracket (7) directly below the through hole (13). A secondary pressure rod (15) is vertically provided on the piston rod of 14). The secondary pressure rod (15) is coaxial with the through hole (13). The secondary pressure rod (15) is also provided with the first airflow channel (2) and the second airflow channel (4). Near the top of the circumference of the secondary pressure rod (15), there are also air outlets of the first airflow channel (2) and the second airflow channel (4) on the secondary pressure rod (15). The distance between the air outlet of the first airflow channel (2) on the secondary pressure rod (15) and the top of the secondary pressure rod (15) is less than the axial length of one press-fitted bushing (3). The distance between the air outlet of the second airflow channel (4) on the secondary pressure rod (15) and the top of the secondary pressure rod (15) is greater than the axial length of one press-fitted bushing (3) and less than the axial length of two press-fitted bushings (3).

2. The method for preventing over-installation and under-installation errors of the shift fork bushing according to claim 1, characterized in that, In step 3), the method for measuring the actual flow rate B in the first airflow channel (2) and the actual flow rate C in the second airflow channel (4) is to connect a pipe with a flow sensor (5) to the air inlet of the first airflow channel (2) and the air inlet of the second airflow channel (4), and then connect the signal of the flow sensor (5) to the control system, and display the flow rate B and flow rate C through the display screen connected to the control system.

3. The method for preventing over-installation and under-installation errors of the shift fork bushing according to claim 1, characterized in that, In step 1), the air inlet of the first airflow channel (2) and the air inlet of the second airflow channel (4) are both located between the two ends of the press rod (1), and the distance from the air inlet of the first airflow channel (2) to the press end of the press rod (1) and the distance from the air inlet of the second airflow channel (4) to the press end of the press rod are both greater than the depth of the mounting hole on the shift fork (11).

4. The method for preventing over-installation and under-installation errors of the shift fork bushing according to claim 1, characterized in that, In step 1), the press rod (1) is provided with at least two first airflow channels (2) and two second airflow channels (4). Each first airflow channel (2) has an air inlet and an air outlet, and each second airflow channel (4) has an air inlet and an air outlet. The air outlets of the first airflow channels (2) and the air outlets of the second airflow channels (4) are arranged in a circular array on the circumferential surface of the press rod (1).

5. The method for preventing over-installation and under-installation errors of the shift fork bushing according to claim 1, characterized in that, In step 3), the method for measuring the actual flow rate B passing through the first airflow channel (2) is as follows: a flow valve (6) is set at the air inlet of the first airflow channel (2), the air inlet of the first airflow channel (2) is connected to the air outlet of the flow valve (6), and the air inlet of the flow valve (6) is connected to the air outlet of an external air source.

6. The method for preventing over-installation and under-installation errors of the shift fork bushing according to claim 1, characterized in that, It also includes an auxiliary frame (16), which is slidably connected to the support (7). The sliding direction of the auxiliary frame (16) is parallel to the worktable (8). The auxiliary frame (16) is located below the worktable (8). The second cylinder (14) is provided on the auxiliary frame (16). The through hole (13) is located on the projection of the sliding path of the auxiliary frame (16) on the worktable.

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