Device for measuring distance between transmission clutch piston and outer hub snap spring groove

Abstract

The invention discloses equipment for measuring the distance between a transmission clutch piston and an outer hub snap spring groove, and relates to the technical field of transmissions, the equipment comprises a rack and a base, the rack is provided with a lifting cylinder, the end part of a piston rod of the lifting cylinder is provided with a measuring device located below the rack, and the base is arranged below the measuring device; a plurality of measurement sensors are arranged to synchronously acquire data and calculate an average value, so that the random error influence of a single sensor is effectively reduced, and a high-precision measurement result is realized; the measuring device is arranged, high automation is achieved in the whole measuring process, a lifting air cylinder, a lifting air cylinder, an air claw and other components work cooperatively, a large amount of manual operation is not needed, measurement is completed rapidly, the requirement for efficient production is met, and measuring efficiency is high; for different machine types, the displacement air cylinder is matched with the first displacement air cylinder sensor and the second displacement air cylinder sensor to sense signals, special measurement programs of the corresponding machine types are automatically switched, the consistency and repeatability of measurement results are ensured, and the measurement reproducibility is good.

Description

Technical Field

[0001] The present invention relates to the technical field of transmissions, and particularly to a measuring device for the distance between a transmission clutch piston and a snap ring groove of an outer hub. Background Art

[0002] The transmission internally contains multiple clutches, which cooperate with each other to achieve the shifting function of the transmission. The clutch mainly consists of components such as an outer hub, a piston, a friction plate group, and an adjusting snap ring. During the assembly process, first, the piston needs to be installed into the outer hub, and then the friction plate group and the adjusting snap ring are installed in sequence. The thickness of the adjusting snap ring needs to be determined according to the dimensions of components such as the outer hub, the piston, and the friction plate group. Therefore, during assembly, it is necessary to first measure the distance between the clutch piston and the snap ring groove of the outer hub.

[0003] Currently, this measurement work is generally carried out manually using a simple tooling and a depth gauge, which has problems such as low measurement accuracy, low efficiency, and poor reproducibility. These problems are likely to lead to inaccurate measurement results, and then the selected adjusting snap ring is inaccurate, ultimately affecting the performance and service life of the clutch. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a measuring device for the distance between a transmission clutch piston and a snap ring groove of an outer hub to overcome the defects of the existing low measurement accuracy, low efficiency, and poor measurement reproducibility; and achieve the purpose of high measurement accuracy, high efficiency, and good measurement reproducibility.

[0005] To solve the above technical problems, the technical solution of the present invention is: a measuring device for the distance between a transmission clutch piston and a snap ring groove of an outer hub, including a frame and a base. A lifting cylinder is provided on the frame, and a measuring device located below the frame is provided at the end of the piston rod of the lifting cylinder. The base is arranged below the measuring device.

[0006] Further, the measuring device includes a second connecting plate fixedly arranged at the end of the piston rod of the lifting cylinder and a third connecting plate arranged below the second connecting plate. A plurality of first connecting columns are evenly arranged along the circumference between the second connecting plate and the third connecting plate. A first spring is arranged on the outer periphery of the first connecting column. The upper end of the first spring is fixedly connected to the second connecting plate, and the lower end of the first spring is fixedly connected to the lower part of the first connecting column.

[0007] Further, a fourth connecting column is provided at the bottom end of the third connecting plate, a fourth connecting plate is provided at the bottom end of the fourth connecting column, a floating thrust bearing is sleeved between the upper part of the fourth connecting column and the third connecting plate, a second spring is arranged on the outer periphery of the fourth connecting column, the upper end of the second spring is fixedly connected to the floating thrust bearing, and the lower end of the second spring is fixedly connected to the fourth connecting plate.

[0008] Further, mounting holes are respectively provided at the centers of the third connecting plate and the fourth connecting plate. A displacement cylinder is provided on the fourth connecting plate. The piston rod of the displacement cylinder respectively penetrates through the mounting holes of the third connecting plate and the fourth connecting plate. A displacement cylinder induction block is provided at the top of the piston rod of the displacement cylinder. A fifth connecting plate is fixedly connected below the piston rod of the displacement cylinder.

[0009] Further, a second bracket and a third bracket are provided on the third connecting plate. A first displacement cylinder sensor is fixedly provided at the upper part of the second bracket. A second displacement cylinder sensor is fixedly provided at the lower part of the third bracket.

[0010] Further, a sixth connecting plate is provided below the fifth connecting plate. A plurality of second guide posts are evenly arranged along the circumference between the fifth connecting plate and the sixth connecting plate. A second linear bearing is provided between the second guide post and the sixth connecting plate. The second guide post moves linearly along the axial direction of the second linear bearing.

[0011] Further, a mounting hole is provided at the center of the sixth connecting plate. A lifting cylinder is provided on the sixth connecting plate. The output end of the lifting cylinder penetrates through the mounting hole of the sixth connecting plate and extends downward. A plurality of fourth brackets are also provided on the sixth connecting plate. A measuring sensor is fixedly provided on the fourth bracket. A plurality of telescopic grooves are provided on the fourth connecting plate. The positions of the telescopic grooves correspond to the positions of the measuring sensors. A small hole is also provided on the sixth connecting plate. The measuring head of the measuring sensor passes through the small hole and extends downward. A seventh connecting plate is provided below the measuring sensor. A contact screw corresponding to the position of the measuring sensor is provided on the seventh connecting plate; The output end of the lifting cylinder is fixedly connected to the seventh connecting plate. A plurality of second connecting columns are evenly fixed along the circumference between the fourth connecting plate and the sixth connecting plate.

[0012] Further, a gripper is provided at the bottom of the seventh connecting plate. An eighth connecting plate is provided below the seventh connecting plate. A mounting hole is provided at the center of the eighth connecting plate. A piston contact block is provided at the bottom of the eighth connecting plate. The piston contact block is a hollow cylindrical shape. The gripper passes through the mounting hole on the eighth connecting plate and extends into the piston contact block; A plurality of circlip groove claws are provided on the gripper. Through holes corresponding to the positions of the circlip groove claws are provided on the piston contact block to facilitate the circlip groove claws to extend out.

[0013] Further, a first connecting plate and a first bracket are provided on the frame. A positioning screw is provided on the first connecting plate. A first position sensor is provided at the upper part of the first bracket. A second position sensor is provided at the lower part of the first bracket.

[0014] Further, an installation through-hole is provided in the first connecting plate, and the lifting cylinder is located within the installation through-hole. A first guiding column is fixed to the bottom of the first connecting plate. The first guiding column penetrates through the machine frame in the vertical direction and extends below it. The bottom end of the first guiding column is fixedly connected to the second connecting plate. A first linear bearing is provided between the first guiding column and the machine frame, and the first guiding column moves linearly along the axial direction of the first linear bearing.

[0015] The present invention adopts the above technical solutions. Compared with the prior art, it has the following advantages: By setting multiple measurement sensors to synchronously collect data and calculate the average value, the influence of random errors of a single sensor is effectively reduced, thereby achieving high-precision measurement results; A measurement device is set up, which is highly automated throughout the measurement process. Components such as the lifting cylinder, the lifting cylinder, and the air claw work together, without a large amount of manual operation, quickly complete the measurement, greatly shortening the measurement time, meeting the requirements of high-efficiency production, and having high measurement efficiency; For different models, the displacement cylinder cooperates with the first displacement cylinder sensor and the second displacement cylinder sensor to sense signals, automatically switches the dedicated measurement program corresponding to the model, ensures the precise adaptation of the measurement conditions and parameters for each model, and ensures the consistency and repeatability of the measurement results, and has good measurement reproducibility. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the measuring device for the distance between the transmission clutch piston and the snap ring groove in the embodiment of the present invention; Figure 2 is Figure 1 a cross-sectional view of; Figure 3 It is a partial structural schematic diagram of the measuring device for the distance between the transmission clutch piston and the snap ring groove in the embodiment of the present invention; Figure 4 is Figure 3 a cross-sectional view of; Figure 5 is Figure 2 an enlarged structural schematic diagram of part A in; Figure 6 is Figure 4 an enlarged structural schematic diagram of part B in.

[0017] In the figure: 1 - lifting cylinder, 2 - first connecting plate, 3 - first guiding column, 4 - first linear bearing, 5 - first bracket, 6 - first position sensor, 7 - frame, 8 - second connecting plate, 9 - third connecting plate, 10 - fourth connecting plate, 11 - first spring, 12 - first connecting column, 13 - second bracket, 14 - first displacement cylinder sensor, 15 - second connecting column, 16 - second guiding column, 17 - second linear bearing, 18 - third connecting column, 19 - spacer sleeve, 20 - fifth connecting plate, 21 - sixth connecting plate, 22 - seventh connecting plate, 23 - eighth connecting plate, 24 - gripper, 25 - base, 27 - second spring, 28 - fourth connecting column, 29 - piston contact block, 30 - circlip groove claw, 31 - displacement cylinder induction block, 32 - displacement cylinder, 33 - lifting cylinder, 34 - measuring sensor, 35 - third bracket, 36 - contact screw, 37 - measuring device, 38 - positioning screw, 40 - circlip groove, 41 - second displacement cylinder sensor, 42 - clutch outer hub, 43 - clutch piston, 44 - floating thrust bearing, 45 - fourth bracket, 46 - second position sensor. Detailed implementation manners

[0018] The following further explains the detailed implementation manners of the present invention with reference to the accompanying drawings. It should be noted here that the explanations of these implementation manners are used to help understand the present invention, but do not constitute a limitation to the present invention. In addition, the technical features involved in the various implementation manners of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0019] Example, as Figures 1-6 shown, a measuring device for the distance between a transmission clutch piston and an outer hub circlip groove includes a frame 7 and a base 25. The base 25 is used to place the clutch outer hub 42. A lifting cylinder 1 is provided on the frame 7. The end of the piston rod of the lifting cylinder 1 is provided with a measuring device 37 located below the frame 7. The base 25 is arranged below the measuring device 37.

[0020] The measuring device 37 includes a second connecting plate 8 fixedly arranged at the end of the piston rod of the lifting cylinder 1 and a third connecting plate 9 arranged below the second connecting plate 8. A plurality of first connecting columns 12 are evenly arranged along the circumference between the second connecting plate 8 and the third connecting plate 9. In this example, there are 3. A first spring 11 is arranged on the outer periphery of the first connecting column 12. The upper end of the first spring 11 is fixedly connected to the second connecting plate 8, and the lower end of the first spring 11 is fixedly connected to the lower part of the first connecting column 12.

[0021] The bottom end of the third connecting plate 9 is provided with a fourth connecting column 28. The bottom end of the fourth connecting column 28 is provided with a fourth connecting plate 10. A floating thrust bearing 44 is sleeved between the upper part of the fourth connecting column 28 and the third connecting plate 9. A second spring 27 is arranged on the outer periphery of the fourth connecting column 28. The upper end of the second spring 27 is fixedly connected with the floating thrust bearing 44, and the lower end of the second spring 27 is fixedly connected with the fourth connecting plate 10.

[0022] Mounting holes are respectively arranged at the centers of the third connecting plate 9 and the fourth connecting plate 10. A displacement cylinder 32 is arranged on the fourth connecting plate 10. The piston rod of the displacement cylinder 32 respectively penetrates through the mounting holes of the third connecting plate 9 and the fourth connecting plate 10. A displacement cylinder induction block 31 is arranged at the top of the piston rod of the displacement cylinder 32. A fifth connecting plate 20 is fixedly connected below the piston rod of the displacement cylinder 32.

[0023] A second bracket 13 and a third bracket 35 are arranged on the third connecting plate 9. A first displacement cylinder sensor 14 is fixedly arranged on the upper part of the second bracket 13. A second displacement cylinder sensor 41 is fixedly arranged on the lower part of the third bracket 35. The first displacement cylinder sensor 14 and the second displacement cylinder sensor 41 are used to detect the position of the displacement cylinder induction block 31.

[0024] A sixth connecting plate 21 is arranged below the fifth connecting plate 20. A plurality of second guide columns 16 are evenly arranged along the circumference between the fifth connecting plate 20 and the sixth connecting plate 21. A second linear bearing 17 is arranged between the second guide column 16 and the sixth connecting plate 21. The second guide column 16 makes a linear motion along the axial direction of the second linear bearing 17. A mounting hole is arranged at the center of the sixth connecting plate 21. A lifting cylinder 33 is arranged on the sixth connecting plate 21. The output end of the lifting cylinder 33 penetrates through the mounting hole of the sixth connecting plate 21 and extends downward. A plurality of fourth brackets 45 are also arranged on the sixth connecting plate 21. In this example, there are 3 fourth brackets 45. A measuring sensor 34 is fixedly arranged on the fourth bracket 45. A plurality of telescopic grooves are arranged on the fourth connecting plate 10. In this example, both the measuring sensor 34 and the telescopic grooves are 3. The positions of the telescopic grooves correspond to the positions of the measuring sensor 34. A small hole is also arranged on the sixth connecting plate 21. The measuring head of the measuring sensor 34 extends downward through the small hole. A seventh connecting plate 22 is arranged below the measuring sensor 34. A contact screw 36 corresponding to the position of the measuring sensor 34 is arranged on the seventh connecting plate 22. The output end of the lifting cylinder 33 is fixedly connected with the seventh connecting plate 22. A plurality of second connecting columns 15 are fixedly arranged along the circumference between the fourth connecting plate 10 and the sixth connecting plate 21.

[0025] The bottom of the seventh connecting plate 22 is provided with a pneumatic claw 24. Below the seventh connecting plate 22, there is an eighth connecting plate 23. The center of the eighth connecting plate 23 is provided with a mounting hole. The bottom of the eighth connecting plate 23 is provided with a piston contact block 29. The piston contact block 29 is a hollow cylindrical shape. The pneumatic claw 24 passes through the mounting hole on the eighth connecting plate 23 and extends into the piston contact block 29. The pneumatic claw 24 is provided with a plurality of circlip groove claws 30. The piston contact block 29 is provided with through holes corresponding to the positions of the circlip groove claws 30 to facilitate the extension of the circlip groove claws 30.

[0026] On the frame 7, there are a first connecting plate 2 and a first support 5. The first connecting plate 2 is provided with a positioning screw 38. The upper part of the first support 5 is provided with a first position sensor 6, and the lower part of the first support 5 is provided with a second position sensor 46. The first position sensor 6 and the second position sensor 46 judge the position of the measuring device 37 by detecting the positioning screw 38.

[0027] An installation through hole is opened in the first connecting plate 2. The lifting cylinder 1 is located in this installation through hole. The bottom of the first connecting plate 2 is fixed with several first guide columns 3, which are 3 in this example. The first guide columns 3 penetrate the frame 7 vertically and extend below it. The bottom end of the first guide column 3 is fixedly connected to the second connecting plate 8. A first linear bearing 4 is provided between the first guide column 3 and the frame 7. The first guide column 3 makes a linear motion along the axial direction of the first linear bearing 4.

[0028] Working process: First, place the clutch outer hub standard part with the piston already installed on the base 25. Start the equipment switch. The output end of the lifting cylinder 1 extends downward, driving the measuring device 37 to move downward. After the piston contact block 29 presses against the top surface of the standard part piston, it stops. The pneumatic claw 24 drives the three circlip groove claws 30 to extend, so that the circlip groove claws 30 extend into the circlip groove of the standard part. The lifting cylinder 33 drives the pneumatic claw 24 and the circlip groove claws 30 to move upward until the upper end surface of the circlip groove claw 30 contacts the upper end surface of the circlip groove of the standard part and then stops. At this time, the seventh connecting plate 22 drives the contact screw 36 to rise. The contact screw 36 contacts the measuring head of the measuring sensor 34 and compresses the measuring head upward, and marks this compressed position as zero. Finally, the lifting cylinder 33 drops, the pneumatic claw 24 drives the three circlip groove claws 30 to retract radially, and the lifting cylinder 1 moves upward to complete the calibration of the standard part.

[0029] During the actual measurement stage of the workpiece, manually scan the QR code on the clutch outer hub 42, and place the clutch outer hub 42 with the installed clutch piston 43 on the base 25; turn on the equipment switch, the output end of the lifting cylinder 1 extends downward, driving the measuring device 37 to move downward. After the piston contact block 29 presses against the top surface of the clutch piston 43 and stops, then the air claw 24 drives the three circlip groove claws 30 to extend, so that the circlip groove claws 30 extend into the circlip groove 40. The lifting cylinder 33 drives the air claw 24 and the circlip groove claws 30 to move upward. When the upper end surface of the circlip groove claw 30 contacts the upper end surface of the circlip groove 40 and stops, at this time the seventh connecting plate 22 drives the contact screw 36 to rise, the contact screw 36 contacts the measuring head of the measuring sensor 34 and compresses the measuring head upward. The values measured by the three measuring sensors 34 are averaged, and the average value is transmitted to the controller for comparison with the compression amount when measuring the standard part, so as to obtain the distance between the top surface of the clutch piston 43 of the workpiece and the upper end surface of the circlip groove 40. Finally, the lifting cylinder 33 descends, the air claw 24 drives the three circlip groove claws 30 to radially retract, and the lifting cylinder 1 moves upward to complete the measurement.

[0030] After the standard part completes the first calibration, subsequent continuous automated measurement of actual workpieces can be carried out.

[0031] When different models need to be measured, such as model A and model B, the distances between the top surfaces of the clutch pistons and the upper end surfaces of the circlip grooves of the two models are different. When detecting model A, the piston rod of the displacement cylinder 32 retracts upward, the sixth connecting plate 21 and the measuring sensor 34 move upward. At this time, the first displacement cylinder sensor 14 detects the signal of the displacement cylinder induction block 31, and the PLC controller immediately executes the special measurement program for model A; when switching to detect model B, the piston rod of the displacement cylinder 32 extends downward, driving the sixth connecting plate 21 and the measuring sensor 34 to move downward. The second displacement cylinder sensor 41 detects the signal of the displacement cylinder induction block 31, and the system automatically switches to the measurement program for model B.

[0032] By setting the method of multiple measuring sensors 34 to synchronously collect data and calculate the average value, the influence of the random error of a single sensor is effectively reduced, thus achieving high-precision measurement results; setting the measuring device 37, which is highly automated throughout the measurement process. Components such as the lifting cylinder 1, the lifting cylinder 33, and the air claw 24 work together, without a large amount of manual operation, quickly complete the measurement, greatly shortening the measurement time, meeting the requirements of high-efficiency production, and having high measurement efficiency; for different models, the displacement cylinder 32 cooperates with the first displacement cylinder sensor 14 and the second displacement cylinder sensor 41 to sense signals, automatically switching the special measurement program for the corresponding model, ensuring the precise adaptation of the measurement conditions and parameters for each model, and ensuring the consistency and repeatability of the measurement results, and having good measurement reproducibility.

[0033] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, substitutions, and variations made to these embodiments still fall within the protection scope of the present invention.

Claims

1. Transmission clutch piston and outer hub circlip groove distance measuring device, characterized in that: It includes a frame (7) and a base (25). An up-and-down cylinder (1) is provided on the frame (7). The end of the piston rod of the up-and-down cylinder (1) is provided with a measuring device (37) located below the frame (7), and the base (25) is arranged below the measuring device (37).

2. The transmission clutch piston and outer hub circlip groove distance measuring device according to claim 1, characterized in that: The measuring device (37) includes a second connecting plate (8) fixedly arranged at the end of the piston rod of the up-and-down cylinder (1) and a third connecting plate (9) arranged below the second connecting plate (8). A number of first connecting columns (12) are evenly arranged along the circumference between the second connecting plate (8) and the third connecting plate (9). A first spring (11) is arranged on the outer circumference of the first connecting column (12). The upper end of the first spring (11) is fixedly connected to the second connecting plate (8), and the lower end of the first spring (11) is fixedly connected to the lower part of the first connecting column (12).

3. The measuring device for the distance between the transmission clutch piston and the snap ring groove of the outer hub according to claim 2, wherein: A fourth connecting column (28) is provided at the bottom end of the third connecting plate (9). A fourth connecting plate (10) is provided at the bottom end of the fourth connecting column (28). A floating thrust bearing (44) is sleeved between the upper part of the fourth connecting column (28) and the third connecting plate (9). A second spring (27) is arranged on the outer circumference of the fourth connecting column (28). The upper end of the second spring (27) is fixedly connected to the floating thrust bearing (44), and the lower end of the second spring (27) is fixedly connected to the fourth connecting plate (10).

4. The transmission clutch piston and outer hub circlip groove distance measuring device according to claim 3, characterized in that: Mounting holes are respectively provided at the centers of the third connecting plate (9) and the fourth connecting plate (10). A displacement cylinder (32) is provided on the fourth connecting plate (10). The piston rod of the displacement cylinder (32) respectively penetrates through the mounting holes of the third connecting plate (9) and the fourth connecting plate (10). A displacement cylinder induction block (31) is provided at the top of the piston rod of the displacement cylinder (32), and a fifth connecting plate (20) is fixedly connected below the piston rod of the displacement cylinder (32).

5. The transmission clutch piston and outer hub circlip groove distance measuring device according to claim 2, characterized in that: A second bracket (13) and a third bracket (35) are provided on the third connecting plate (9). A first displacement cylinder sensor (14) is fixedly provided at the upper part of the second bracket (13), and a second displacement cylinder sensor (41) is fixedly provided at the lower part of the third bracket (35).

6. The transmission clutch piston and outer hub circlip groove distance measuring device according to claim 4, characterized in that: A sixth connecting plate (21) is provided below the fifth connecting plate (20). A number of second guide columns (16) are evenly arranged along the circumference between the fifth connecting plate (20) and the sixth connecting plate (21). A second linear bearing (17) is arranged between the second guide column (16) and the sixth connecting plate (21), and the second guide column (16) makes a linear motion along the axial direction of the second linear bearing (17).

7. The measuring device for the distance between the transmission clutch piston and the snap ring groove of the outer hub according to claim 6, characterized in that: The center of the sixth connecting plate (21) is provided with a mounting hole. A lifting cylinder (33) is provided on the sixth connecting plate (21). The output end of the lifting cylinder (33) extends downward through the mounting hole of the sixth connecting plate (21). A number of fourth brackets (45) are also provided on the sixth connecting plate (21). A measuring sensor (34) is fixedly provided on the fourth bracket (45). A number of telescopic grooves are provided on the fourth connecting plate (10), and the positions of the telescopic grooves correspond to the positions of the measuring sensors (34). Small holes are also provided on the sixth connecting plate (21). The measuring head of the measuring sensor (34) extends downward through the small holes. A seventh connecting plate (22) is provided below the measuring sensor (34). A contact screw (36) corresponding to the position of the measuring sensor (34) is provided on the seventh connecting plate (22). The output end of the lifting cylinder (33) is fixedly connected to the seventh connecting plate (22). A number of second connecting columns (15) are uniformly and fixedly arranged along the circumference between the fourth connecting plate (10) and the sixth connecting plate (21).

8. The measuring device for the distance between the transmission clutch piston and the snap ring groove of the outer hub according to claim 7, characterized in that: A pneumatic claw (24) is provided at the bottom of the seventh connecting plate (22). An eighth connecting plate (23) is provided below the seventh connecting plate (22). The center of the eighth connecting plate (23) is provided with a mounting hole. A piston contact block (29) is provided at the bottom of the eighth connecting plate (23). The piston contact block (29) is a hollow cylindrical shape. The pneumatic claw (24) passes through the mounting hole on the eighth connecting plate (23) and extends into the piston contact block (29). A number of circlip groove claws (30) are provided on the pneumatic claw (24). Through holes corresponding to the positions of the circlip groove claws (30) are provided on the piston contact block (29) to facilitate the circlip groove claws (30) to extend out.

9. The measuring device for the distance between the transmission clutch piston and the snap ring groove of the outer hub according to claim 1, characterized in that: A first connecting plate (2) and a first bracket (5) are provided on the frame (7). A positioning screw (38) is provided on the first connecting plate (2). A first position sensor (6) is provided at the upper part of the first bracket (5), and a second position sensor (46) is provided at the lower part of the first bracket (5).

10. The transmission clutch piston and outer hub circlip groove distance measuring device according to claim 9, wherein: A mounting through hole is formed inside the first connecting plate (2). The lifting cylinder (1) is located inside the mounting through hole. A first guide post (3) is fixedly provided at the bottom of the first connecting plate (2). The first guide post (3) penetrates through the frame (7) in the vertical direction and extends to its lower side. The bottom end of the first guide post (3) is fixedly connected to the second connecting plate (8). A first linear bearing (4) is provided between the first guide post (3) and the frame (7). The first guide post (3) makes a linear motion along the axial direction of the first linear bearing (4).

Images