Self-locking force testing device for gear shifting execution mechanism of automobile transmission
By using a bidirectionally independently configured test execution cylinder and solenoid valve, combined with air pressure regulation and shift fork shaft displacement interaction, efficient and accurate testing of the self-locking force of the automotive transmission shift actuator is achieved, solving the problem of large errors in existing technologies and improving testing efficiency and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-04
- Publication Date
- 2026-03-10
AI Technical Summary
Existing technologies for testing the self-locking force of automotive transmission shift actuators have large and inaccurate errors, posing safety hazards, and are inefficient, failing to effectively distinguish between self-locking force and thrust.
The test execution cylinder and solenoid valve are set up independently in both directions. Through the air pressure regulating device and the test control device, the test is automated. By using the interaction of gas pressure and shift fork shaft displacement, combined with TCU control, the self-locking force is accurately measured.
It improves the accuracy and automation of self-locking force testing, saves human resources, reduces testing errors, and increases testing efficiency.
Smart Images
Figure CN121632579A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of self-locking force testing, in particular to a self-locking force testing device for a gear shifting actuator of an automobile transmission. BACKGROUND
[0002] After the gear shifting actuator of an automobile transmission completes a gear shifting action, the gear shifting power source of the actuator itself is cut off, and the friction force generated by the contact between the coupling sleeve and the power gear cone is relied on to maintain stability. In order to prevent the coupling sleeve and the power gear from being disconnected, a self-locking spring and a steel ball are used to lock the shift fork or the self-locking slot on the shift fork shaft after the shift fork completes the gear shifting action. At this time, a self-locking force is generated, which is affected by the size of the self-locking spring force, the angle and installation position of the self-locking slot. The influence of the angle of the self-locking slot is the most important. Taking a 200N self-locking spring as an example, a 22N error will be caused by the angles of 60° and 65° of the self-locking slot, which exceeds the normal floating of 5%, and causes a safety hazard to driving.
[0003] Therefore, after the product is assembled, a self-locking force performance test needs to be performed. Most enterprises use a push force sensor to push the gear shifting shaft to move to complete the test. However, this test scheme has a disadvantage. The force measuring principle of the push force sensor is bidirectional. The measured result will include the self-locking force and the force of the forward movement of the push force sensor, and the force of the forward movement is not fixed. The error of the test result will be relatively large. SUMMARY
[0004] In view of the above problems, the present application provides a self-locking force testing device for a gear shifting actuator of an automobile transmission, which uses bidirectional and independently arranged test execution cylinders to perform self-locking force testing, so that the test data is accurate and reliable, the test automation degree is high, a large amount of human resources is saved, and the test efficiency is improved.
[0005] A self-locking force testing device for a gear shifting actuator of an automobile transmission is used to test the self-locking force of a gear shifting actuator of a transmission having N shift fork shafts, N being a natural number, characterized in that it comprises: a workbench, the central area of which forms a test cavity, and the frame of the upper surface of the workbench forms a supporting frame for the gear shifting actuator of the automobile transmission, and the upper shell of the gear shifting actuator of the automobile transmission is supported on the supporting frame in a test state, and the N shift fork shafts are located in the test cavity; a gas pressure adjusting device, which has a pressure sensor built therein to monitor the gas pressure, and is accurately adjusted to the required gas pressure; a test control device, which has 2N electromagnetic valves built therein; and a test execution device, which comprises 2N test execution cylinders; The air pressure adjusting device and the test control device are connected to the TCU of the gear shifting execution mechanism of the transmission, the inner cavity of the workbench corresponds to the two ends of the moving direction of each shift fork shaft, and a test execution cylinder is arranged at each end, each test execution cylinder is independently connected to a corresponding electromagnetic valve, the air pressure adjusting device is connected to the cavity of the test control device after adjusting the corresponding air pressure, and the test control device independently and sequentially controls the on-off of 2N electromagnetic valves, and then drives 2N test execution cylinders to complete the determination of the self-locking force in two directions of each shift fork shaft.
[0006] Further features are that the air source filtering device filters the high-pressure gas to remove water and impurities, and then connects the high-pressure gas to the air pressure adjusting device through a pressure reducing valve and a gas pipe. Since each group of shift fork shafts has three position states of H, N and L, the self-locking force of two gear positions needs to be detected by each group of test execution cylinders during the self-locking force test of the gear position, that is, the self-locking force of four action modes of H-N, N-L, N-H and N-L needs to be tested. The air pressure adjusting device is an electrical proportional valve with two groups of electromagnetic switch valves inside, so as to adjust the increase or decrease of the output pressure, the gas path of the air pressure adjusting device is connected to the test execution device, and the data output line of the air pressure adjusting device is connected to the TCU of the gear shifting execution mechanism of the transmission. The test cavity is provided with at least one group of shift fork clamping grooves corresponding to the position of the shift fork shaft in the N position, the shift fork clamping grooves are used for quickly positioning the shift fork position of the gear shifting execution mechanism of the automobile transmission, and the quick alignment and assembly of the gear shifting execution mechanism of the automobile transmission and the workbench are ensured. The supporting frame is further provided with an upper protruding positioning pin corresponding to the positioning hole of the upper shell of the gear shifting execution mechanism of the automobile transmission, and the supporting frame is further provided with a plurality of positioning screw holes, and a bolt is fastened to the positioning screw hole after penetrating the connecting hole of the upper shell of the gear shifting execution mechanism of the automobile transmission, so as to ensure the quick and stable installation of the gear shifting execution mechanism of the automobile transmission. The test function is realized by high-frequency air pressure adjustment through the data interaction of air pressure adjustment and shift shaft displacement. The test execution cylinder adopts a special piston-free low-friction cylinder, which greatly reduces the sliding resistance and realizes the precise test function with a friction coefficient less than 0.01. The test control device is connected to the TCU through a wire harness, different electromagnetic valves are controlled by the TCU in different gear sequences to realize full-automatic test.
[0007] After adopting the solution of this invention, the air pressure regulating device and the test control device are respectively connected to the TCU. According to the test sequence set by the TCU program, the corresponding on / off solenoid valves are opened to supply gas output. The gas output by the test control device enters the test execution cylinder of the test execution device through a pipeline. The movement of the test execution cylinder pushes the corresponding shift fork shaft of the transmission shifting mechanism to move. A self-locking bolt is installed on the shift fork shaft of the transmission shifting mechanism. The TCU determines whether to increase or decrease the gas pressure of the air pressure regulating device based on the feedback from the displacement sensor on the shift fork shaft of the transmission shifting mechanism. The TCU collects the displacement data of the cylinder shaft. The initial pressure setting of the regulating device is less than the self-locking force of the transmission shift mechanism, and then it is slowly increased according to the test results; until the test is completed, the displacement curve of the output cylinder shaft and the pressure regulation curve are output; the self-locking force of the transmission shift actuator increases with the increase of displacement, and decreases significantly after exceeding the peak value. Exceeding the peak value indicates the end of the test. The peak value of self-locking is the maximum self-locking force, which is recorded as the self-locking force of the corresponding gear. The self-locking force test is performed by a bidirectional independently set test execution cylinder, which makes the test data accurate and reliable, and the test is highly automated, saving a lot of manpower and improving test efficiency. Attached Figure Description
[0008] Figure 1 This is a three-dimensional illustration of the present invention. Figure One ; Figure 2 This is a three-dimensional illustration of the present invention. Figure Two ; Figure 3 This is a top view structural diagram of the present invention; Figure 4 This is an exploded view of the transmission shifting actuator and the assembly of the present invention corresponding to a specific embodiment; Figure 5 The diagram shows a cross-sectional view of the transmission shifting actuator corresponding to a specific embodiment and the assembled version of the present invention. The names corresponding to the serial numbers in the diagram are as follows: 1. Workbench frame; 11. Test chamber; 12. Support frame; 2. Air source filter device; 3. Air pressure regulating device; 4. Test control device; 5. Test execution device; 6. Shift fork slot; 7. Positioning pin; 8. Test execution cylinder. The gear actuator 100, the upper housing 101, and the shift fork shaft 102. Detailed Implementation
[0009] A self-locking force testing device for a transmission shift actuator is provided. This device is used to test the self-locking force of a transmission shift actuator with four shift fork shafts. It includes a workbench 1, an air source filter 2, an air pressure regulating device 3, a test control device 4, and a test execution device 5. The air source filter 2, air pressure regulating device 3, test control device 4, and test execution device 5 are respectively installed around the workbench 1. The air source filter 2 is connected to the air pressure regulating device 3 via an air pipe, the air pressure regulating device 3 is connected to the test control device 4 via an air pipe, and the test control device 4 is connected to the test execution device 5 via an air pipe.
[0010] In specific implementation, the central area of the workbench 1 forms a test cavity 11, and the frame of the upper surface of the workbench 1 forms a support frame 12 for the automotive transmission shift actuator 100. In the test state, the upper housing 101 of the automotive transmission shift actuator 100 is supported on the support frame 12, and all four shift fork shafts 102 are located in the test cavity 11. The gas pressure regulating device 3 has a built-in pressure sensor to monitor the gas pressure, and the gas pressure regulating device can accurately adjust the gas pressure to the required gas pressure. The test control device 4 has 2N solenoid valves built in (these are obscured in the figure and represent a mature connection and assembly technology). The test execution device 5 is arranged on a set of opposite sides of the workbench, including 8 test execution cylinders, with 4 test execution cylinders 8 fixedly mounted on each set of opposite sides of the workbench. After filtering out moisture and impurities from the high-pressure gas, the gas source filtration device 2 stabilizes the high-pressure gas through a pressure reducing valve, and then connects it to the gas pressure regulating device 3 through a gas pipe. The air pressure regulating device 3 and the test control device 4 are respectively connected to the TCU of the transmission shift actuator. The inner cavity of the workbench 1 is equipped with test execution cylinders 8 at both ends corresponding to the moving direction of each shift fork shaft 102. The height of the test execution cylinders 8 is adapted to the height of the shift fork shaft 102, which ensures that the piston end of the test execution cylinder 8 is in contact with the shaft end of the shift fork shaft 102 for driving operation in the test state. Each test execution cylinder 8 is independently connected to a corresponding solenoid valve. After the air pressure regulating device 3 adjusts to obtain the corresponding air pressure, it is connected to the cavity of the test control device 4. The test control device 4 independently and sequentially controls the opening and closing of the 8 solenoid valves, thereby driving the 8 test execution cylinders 8 to complete the measurement of the self-locking force of each shift fork shaft 102 in two directions.
[0011] Since each shift fork shaft 102 has three position states: H, N, and L, when performing the gear self-locking force test, each test cylinder 8 needs to complete the self-locking force test for two gear changes, that is, the self-locking force of four action modes, HN, NL, NH, and NL, needs to be tested.
[0012] In a specific embodiment, the workbench 1 adopts an aluminum alloy structure and a compact layout, which facilitates use and handling in most scenarios.
[0013] In a specific embodiment, the air pressure regulating device 3 is an electric proportional valve with two sets of electromagnetic switch valves inside, thereby regulating the increase or decrease of the output pressure. The air circuit of the air pressure regulating device is connected to the test execution device 5, and the data output line of the air pressure regulating device 3 is connected to the TCU of the transmission shifting actuator. The test chamber 11 is provided with at least one set of shift fork slots 6 at the position of the shift fork shaft 102 in the N position. The shift fork slots 6 are used to quickly position the shift fork of the automotive transmission shift actuator to ensure that the automotive transmission shift actuator and the workbench 1 are quickly aligned and assembled. The support frame 12 is also provided with an upwardly protruding positioning pin 7, which corresponds to the positioning hole of the upper housing 101 of the automotive transmission shift actuator 100. The support frame 12 is also provided with several positioning screw holes. After the bolt passes through the connection hole of the upper housing 101 of the automotive transmission shift actuator 100, it is tightened into the positioning screw hole to ensure the quick and stable installation of the automotive transmission shift actuator 100.
[0014] In practice, it achieves the testing function by using high-frequency air pressure regulation through data interaction between gas pressure regulation and shift shaft displacement. The test execution cylinder 8 adopts a special pistonless low-friction cylinder, which greatly reduces sliding resistance and achieves accurate testing function with a friction coefficient of less than 0.01. The test control device 4 is connected to the TCU via a wiring harness. The TCU sets different gear positions to control different solenoid valves to achieve fully automatic testing.
[0015] Its working principle is as follows: The air pressure regulating device and the test control device are respectively connected to the TCU. According to the test sequence set by the TCU program, the corresponding on / off solenoid valves are opened to supply gas output; the gas output by the test control device enters the test execution cylinder of the test execution device through the pipeline; the test execution cylinder moves, pushing the corresponding shift fork shaft of the transmission shift actuator to move. The shift fork shaft of the transmission shift actuator is equipped with a self-locking bolt. The TCU determines whether to increase or decrease the gas pressure of the air pressure regulating device based on the feedback from the displacement sensor on the shift fork shaft of the transmission shift actuator. The TCU collects the displacement data of the cylinder shaft; the air pressure regulating device... The initial pressure setting of the throttling device is less than the self-locking force of the transmission shifting mechanism, and then it is slowly increased according to the test results; until the test is completed, the displacement curve of the output cylinder shaft and the pressure adjustment curve are output; the self-locking force of the transmission shifting actuator increases with the increase of displacement, and then decreases significantly after exceeding the peak value. Exceeding the peak value indicates the end of the test. The peak value of self-locking is the maximum self-locking force, which is recorded as the self-locking force of the corresponding gear. The self-locking force test is performed by a bidirectionally independently set test execution cylinder, which makes the test data accurate and reliable, and the test is highly automated, saving a lot of manpower and improving test efficiency.
[0016] The workflow of a specific embodiment is as follows: Step 1: Assemble the transmission shift actuator onto the self-locking force testing device, align the shift fork with the shift fork slot, align the positioning hole with the positioning pin, and simultaneously secure the transmission shift actuator with bolts; Step 2: Test the four shift fork shafts in sequence according to the set test procedure; Step 3: The air pressure regulating device first outputs an initial pressure value, the test control device opens the solenoid valve at the corresponding test position, and the TCU determines whether the pressure increases or decreases based on whether the cylinder shaft of the tested actuator cylinder has displacement. Step 4: Based on the changes in the pressure increase or decrease curve, corresponding to the changes in cylinder shaft displacement, generate a pressure / displacement curve. The force exceeding the peak value is the maximum self-locking force (since the contact area between the piston rod and the shift fork shaft of the test execution cylinder is a constant, the air pressure regulating device will send the set pressure air pressure to the shift fork shaft, and then the corresponding pressure can be quickly obtained according to the formula F=PS).
[0017] The beneficial effects of using this invention are as follows: 1. It adopts an aluminum alloy structure and a compact layout, making it easy to use and move in most scenarios; 2. The adoption of automated control saves a significant amount of manpower and improves testing efficiency; 3. It adopts a modular design, and each module can be disassembled individually, making it easy to adapt to various types of transmission shift actuators; 4. Using air as a power source not only makes it convenient to use but also improves safety; 5. By adopting a data interaction method, the displacement status of the shift actuator is monitored in real time. The pressure of the supplied gas is corrected frequently using an algorithm. The test data is judged more accurately through pressure / displacement curve charts.
[0018] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0019] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A self-locking force testing device for a gear shift actuator of an automobile transmission for testing a self-locking force of a gear shift actuator of a transmission having N shift fork shafts, N being a natural number, characterized by, It comprises: A workbench, the central area of which forms a test cavity, the frame of the upper surface of the workbench forms the supporting frame of the gear shifting actuator of the automobile transmission, the upper shell of the gear shifting actuator of the automobile transmission is supported on the supporting frame in the test state, and N shift fork shafts are located in the test cavity; A gas pressure regulating device, which has a pressure sensor built-in to monitor the gas pressure, and which accurately adjusts to the required gas pressure; A test control device, which has 2N solenoid valves built-in; And a test execution device, which comprises 2N test execution cylinders; The gas pressure regulating device and the test control device are respectively connected to the TCU of the gear shifting actuator, the inner cavity of the workbench is provided with a test execution cylinder corresponding to the two ends of the moving direction of each shift fork shaft, each test execution cylinder is independently connected with a corresponding solenoid valve, the gas pressure regulating device is connected to the cavity of the test control device after adjusting to obtain the corresponding gas pressure, and the test control device independently controls the on-off of 2N solenoid valves in sequence, thereby driving 2N test execution cylinders to complete the determination of the self-locking force in two directions of each shift fork shaft.
2. The self-locking force testing device of a gear shift actuator of an automobile transmission according to claim 1, characterized in that: It further comprises a gas source filtering device, which filters the high-pressure gas from water and impurities, makes the high-pressure gas relatively stable through a pressure reducing valve, and is connected to the gas pressure regulating device through a gas pipe.
3. The self-locking force testing device of a gear shift actuator of an automobile transmission according to claim 1 or 2, characterized in that: Since each group of shift fork shafts has three position states of H, N and L, and the self-locking force test of each group of test execution cylinders needs to be completed in two gear position changes, i.e., the self-locking force of four action modes of H-N, N-L, N-H and N-L needs to be tested.
4. The self-locking force testing device of a gear shift actuator of an automobile transmission according to claim 1, characterized in that: The gas pressure regulating device is an electrical proportional valve, which has two groups of electromagnetic switch valves inside to adjust the increase or decrease of the output pressure, the gas path of the gas pressure regulating device is connected to the test execution device, and the data output line of the gas pressure regulating device is connected to the TCU of the gear shifting actuator.
5. The self-locking force testing device of a gear shift actuator of an automobile transmission according to claim 1, characterized in that: At least one group of shift fork clamping grooves is arranged at the position of the shift fork shaft in the N gear position corresponding to the test cavity, and the shift fork clamping grooves are used to quickly position the shift fork of the gear shifting actuator of the automobile transmission.
6. The self-locking force testing device of a gear shift actuator of an automobile transmission according to claim 1, characterized in that: An upper positioning pin is further arranged on the supporting frame, the positioning pin is arranged corresponding to the positioning hole of the upper shell of the gear shifting actuator of the automobile transmission, and a plurality of positioning screw holes are further arranged on the supporting frame, and a bolt is fastened to the positioning screw hole after penetrating the connecting hole of the upper shell of the gear shifting actuator of the automobile transmission.
7. The self-locking force testing device of a gear shift actuator of an automobile transmission according to claim 1, characterized in that: The test execution cylinder adopts a special piston-free low-friction cylinder.
8. The self-locking force testing device of a gear shift actuator of an automobile transmission according to claim 1, characterized in that: The test control device is connected to the TCU through a wire harness, and different solenoid valves are controlled in sequence by the TCU to realize full-automatic test.