Drive Shaft and Gear Assembly Detection Fixture

Abstract

The present invention discloses an assembly detection fixture for a transmission shaft and a gear, which includes a feeding placement area, an assembly mechanism, a detection mechanism, a finished product section, a robotic arm rotating shaft, and a clamping assembly. The feeding placement area places the transmission shaft with the gear sleeved thereon; the assembly mechanism assembles the gear and the transmission shaft into a gear shaft; the detection mechanism detects whether the gear shaft is assembled incorrectly; the finished product section is used for holding or conveying the gear shaft; the robotic arm rotating shaft includes a robotic arm rotatably mounted on a frame around a vertical rotating shaft and a rotation driving section for driving the robotic arm to rotate along the vertical rotating shaft; the clamping assembly is mounted on the robotic arm and clamps the transmission shaft; the feeding placement area, the assembly mechanism, the detection mechanism, and the finished product section are arranged around the vertical rotating shaft, so that the robotic arm rotating shaft drives the clamping assembly to rotate and move to the feeding placement area, the assembly mechanism, the detection mechanism, or the finished product section. The present invention uses a rotatable robotic arm rotating shaft to convey the gear and the transmission shaft, with a simple structure, a small volume, and a high transmission rate.

Description

Technical Field

[0001] The present invention relates to the assembly of a gear shaft, and particularly to the automatic assembly and detection of a gear shaft. Background Art

[0002] For the traditional installation of a gear and a wheel shaft, it is necessary for workers to place the transmission shaft sleeved with the gear into a stamping device. After the assembly is completed by the stamping device, the workers take it out manually and then put it into a detection mechanism for detection, resulting in low production efficiency.

[0003] Therefore, in Patent CN201921119127.X, a feeding chute is used to directly convey the gear to the corresponding position of the stamping mechanism, and a wheel shaft transmission mechanism is used to transmit the wheel shaft to the corresponding position of the stamping mechanism. Then, the stamping mechanism is used to assemble the gear and the wheel shaft. The assembled gear is conveyed to the detection mechanism through a gear transmission mechanism. After the detection is completed, the qualified products are conveyed to the discharging station through the gear transmission mechanism, and the products are clamped by a manipulator and placed on the discharging chute to realize the automatic loading and unloading of the gear and the gear shaft.

[0004] However, in this automatic assembly and detection mechanism of the gear shaft, it is necessary for the gear transmission mechanism and the manipulator to cooperate to convey the wheel shaft, which occupies a large space. Moreover, the manipulator needs to be assisted in conveying by a sliding track arranged in three-dimensional directions, resulting in a low conveying rate and a large occupied space. In addition, the gear transmission mechanism has a complex structure and high cost.

[0005] Therefore, there is an urgent need for a jig for assembling and detecting a gear shaft that can solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a jig for assembling and detecting a transmission shaft and a gear, which has a simple structure and low cost.

[0007] To achieve the above purpose, the present invention discloses a jig for assembling and detecting a transmission shaft and a gear, which is used to assemble the transmission shaft and the gear into a gear shaft and perform detection. The jig includes a frame, a feeding placement area, an assembly mechanism, a detection mechanism, a finished product part, a robotic arm rotating shaft, and a clamping assembly. The feeding placement area is for placing the transmission shaft sleeved with the gear. The assembly mechanism presses the gear to a preset position of the transmission shaft to assemble it into a gear shaft. The detection mechanism detects whether the gear shaft is assembled incorrectly. The finished product part is used for holding or conveying the gear shaft. The robotic arm rotating shaft includes a robotic arm rotatably mounted on the frame around a vertical rotating shaft and a rotation driving part for driving the robotic arm to rotate along the vertical rotating shaft. The clamping assembly is mounted on the robotic arm and clamps and releases the transmission shaft installed with the gear. The feeding placement area, the assembly mechanism, the detection mechanism, or the finished product part is arranged around the vertical rotating shaft, and the robotic arm rotating shaft drives the clamping assembly to rotate and move to the feeding placement area, the assembly mechanism, the detection mechanism, and the finished product part to convey the gear and the transmission shaft.

[0008] Compared with the prior art, the present invention uses a rotatable robotic arm rotating shaft to convey gears and drive shafts, with a simple structure, small size, and high speed during transmission by directly rotating the robotic arm around the vertical rotating shaft.

[0009] Preferably, the incoming material placement area, the assembly mechanism, the inspection mechanism, and the finished product section are sequentially arranged around the vertical rotating shaft.

[0010] Preferably, the finished product section includes a good product area and a defective product area. The good product area is used to hold or convey successfully assembled gear shafts, and the defective product area is used to hold or convey incorrectly assembled gear shafts.

[0011] Specifically, the good product area has a production conveyor belt for carrying and conveying successfully assembled gear shafts, and the defective product area is equipped with a defective product box for holding incorrectly assembled gear shafts.

[0012] Specifically, the gear assembly inspection fixture further includes a processing unit. The processing unit controls the actions of the assembly mechanism, the inspection mechanism, the robotic arm rotating shaft, and the clamping assembly, and controls the robotic arm rotating shaft and the clamping assembly to sequentially convey the drive shaft with a gear installed to the assembly mechanism and the inspection mechanism. The inspection mechanism detects whether the gear shaft is assembled incorrectly. If so, it is marked as a defective product; if not, it is marked as a good product. The processing unit controls the actions of the robotic arm rotating shaft and the clamping assembly to convey the defective product to the defective product area and the good product to the good product area. The defective products in the gear shafts can be directly screened out through the processing unit.

[0013] More specifically, the drive shaft and the gear assembly inspection fixture further include a material incoming sensor. The material incoming sensor detects whether a drive shaft with a gear sleeved is placed at a preset position in the incoming material placement area, and generates a material incoming signal when a drive shaft with a gear sleeved is placed at the preset position in the incoming material placement area. The processing unit controls the corresponding actions of the assembly mechanism, the inspection mechanism, the robotic arm rotating shaft, and the clamping assembly according to the material incoming signal. Automatic assembly is achieved.

[0014] Preferably, the robotic arm includes a cantilever rotatably installed on the frame around the vertical rotating shaft at a certain height and extending in the horizontal direction, and a telescopic assembly provided on the cantilever and capable of horizontally telescoping relative to the cantilever. The telescopic assembly drives the telescopic assembly to perform telescoping actions.

[0015] Specifically, the inspection mechanism includes an installation groove that matches the shape of the gear shaft, has an opening on the front and side, and is vertically arranged, a first sensor corresponding to the upper position of the installation groove, a second sensor corresponding to the middle position of the installation groove, and a third sensor corresponding to the lower position of the installation groove. The first sensor, the second sensor, and the third sensor detect whether a gear shaft is installed at the corresponding part in the installation groove to generate inspection signals, and the processing unit generates corresponding inspection results based on the inspection signals.

[0016] Specifically, when the processing unit receives three detection signals, it generates an assembly success signal, and when any one of the detection signals is missing, it generates an assembly error signal.

[0017] Preferably, the assembly mechanism includes a positioning table for installing a transmission shaft, an installation groove opened on the front side of the positioning table and opening upward, a stamping die that cooperates with the tabletop of the positioning table and presses a gear into a preset position of the transmission shaft, and a power source that drives the stamping die to perform a stamping action.

[0018] Specifically, the assembly mechanism further includes a fourth sensor for detecting the transmission shaft in the installation groove. The fourth sensor detects whether the transmission shaft is installed in the preset position of the installation groove. If so, it controls the power source to act to drive the stamping die to press the gear into the preset position of the transmission shaft, completing the assembly of the transmission shaft and the gear. It can not only control the power source to automatically complete the assembly of the transmission shaft and the gear, but also detect whether the position of the transmission shaft is accurately placed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a perspective view of the jig for detecting the assembly of the transmission shaft and the gear of the present invention.

[0020] Figure 2 is a partial enlarged view of the jig for detecting the assembly of the transmission shaft and the gear of the present invention.

[0021] Figure 3 is a structural block diagram of the jig for detecting the assembly of the transmission shaft and the gear of the present invention.

[0022] Jig for Detecting the Assembly of Transmission Shaft and Gear 100

[0023] Frame 10 Incoming Material Placement Area 20 Gear 201 Transmission Shaft 202

[0024] Assembly Mechanism 30 Positioning Table 31 Installation Groove 32 Fourth Sensor 33

[0025] Stamping Die 34 Power Source 35

[0026] Detection Mechanism 40 Installation Groove 41 Vertical Groove 411 Horizontal Groove 412

[0027] First Sensor 42 Second Sensor 43 Third Sensor 44

[0028] Finished Product Section 50 Production Conveyor Belt 51 Defective Product Box 52

[0029] Robotic Arm Rotating Shaft 60 Robotic Arm 61 Rotation Driving Unit 62

[0030] Vertical Rotating Shaft 611 Cantilever 613 Telescopic Assembly 614

[0031] Telescopic Cylinder 614a Mounting Member 614b Sliding Track 614c

[0032] Clamping assembly 70, processing unit 80, incoming material sensor 81 Detailed implementation mode

[0033] To describe in detail the technical content, structural features, achieved objectives and effects of the present invention, the following will be described in detail in combination with the implementation modes and with reference to the drawings.

[0034] The present invention discloses a detection jig 100 for assembling a transmission shaft and a gear, which is used to assemble a transmission shaft 202 and a gear 201 into a gear shaft and perform detection. It includes a frame 10, an incoming material placement area 20, an assembly mechanism 30, a detection mechanism 40, a finished product section 50, a robotic arm rotating shaft 60 and a clamping assembly 70. The incoming material placement area 20 places the transmission shaft 202 with the gear 201 sleeved on it; the assembly mechanism 30 presses the gear 201 to a preset position of the transmission shaft 202 to assemble into a gear shaft; the detection mechanism 30 detects whether the gear shaft is assembled incorrectly; the finished product section 50 is used to hold or convey the gear shaft; the robotic arm rotating shaft 60 includes a robotic arm 61 rotatably installed on the frame around a vertical rotating shaft 611 and a rotation driving part 62 that drives the robotic arm 61 to rotate around the vertical rotating shaft 611; the clamping assembly 70 is installed on the robotic arm 61 and clamps and releases the transmission shaft 202 with the gear 201 installed on it; the incoming material placement area 20, the assembly mechanism 30, the detection mechanism 40 and the finished product section 50 are arranged around the vertical rotating shaft 611, and the robotic arm rotating shaft 60 drives the clamping assembly 70 to rotate and move to the incoming material placement area 20, the assembly mechanism 30, the detection mechanism 40 or the finished product section 50 to convey the gear 201 and the transmission shaft 202.

[0035] Among them, the incoming material placement area 20, the assembly mechanism 30, the detection mechanism 40 and the finished product section 50 can be symmetrically arranged around the vertical rotating shaft 611, or can be asymmetrically arranged around the vertical rotating shaft 611. The distances between the incoming material placement area 20, the assembly mechanism 30, the detection mechanism 40 and the finished product section 50 and the vertical rotating shaft 611 can be equal or unequal.

[0036] Among them, the incoming material placement area 20, the assembly mechanism 30, the detection mechanism 40 and the finished product section 50 are arranged in sequence around the vertical rotating shaft 611.

[0037] Refer to Figure 1 , the finished product section 50 includes a good product area and a defective product area. The good product area is used to hold or convey the successfully assembled gear shaft, and the defective product area is used to hold or convey the incorrectly assembled gear shaft.

[0038] Among them, the good product area has a production conveyor belt 51 for carrying and transporting the successfully assembled gear shafts, and the defective product area is equipped with a defective product box 52 for holding the gear shafts assembled incorrectly. In this embodiment, the production conveyor belt 51 is located behind the vertical rotating shaft 611 relative to the defective product box 52. Of course, the production conveyor belt 51 can also be located in front of the vertical rotating shaft 611 relative to the defective product box 52. Of course, the good product area can also have an area or container for holding good products, and the defective product area can also have a conveying mechanism for conveying defective products.

[0039] Specifically, the transmission shaft and gear assembly detection fixture 100 further includes a processing unit 80. The processing unit 80 controls the assembly mechanism 30, the detection mechanism 40, the robotic arm rotating shaft 60, and the clamping assembly 70 to act, and controls the robotic arm rotating shaft 60 and the clamping assembly 70 to sequentially convey the transmission shaft 202 with the gear 201 installed thereto to the assembly mechanism 30 and the detection mechanism 40. The detection mechanism 40 detects whether the gear shaft is assembled incorrectly. If so, it is marked as a defective product; if not, it is marked as a good product. The processing unit 80 controls the robotic arm rotating shaft 60 and the clamping assembly 70 to act to convey the defective products to the defective product area and convey the good products to the good product area. Through the processing unit 80, the defective products in the gear shafts can be directly screened out.

[0040] More specifically, the transmission shaft 202 and gear 201 assembly detection fixture 100 further includes a material incoming sensor 81. The material incoming sensor 81 detects whether the transmission shaft 202 with the gear 201 sleeved thereon is placed at a preset position in the material incoming placement area 20, and generates a material incoming signal when the transmission shaft 202 with the gear 201 sleeved thereon is placed at the preset position in the material incoming placement area 20. The processing unit 80 controls the assembly mechanism 30, the detection mechanism 40, the robotic arm rotating shaft 60, and the clamping assembly 70 to act correspondingly according to the material incoming signal to achieve automatic assembly. The material incoming sensor 81 is a laser sensor.

[0041] Reference Figure 2 , the robotic arm 61 includes a cantilever 613 rotatably installed on the frame 10 around the vertical rotating shaft 611 at a certain height and extending in the horizontal direction, and a telescopic assembly 614 provided on the cantilever 613 and capable of horizontally telescoping relative to the cantilever 613. The clamping assembly 70 is provided on the telescopic assembly 614, and the telescopic assembly 614 drives the clamping assembly 70 to perform telescopic actions. Among them, the telescopic assembly 614 includes a telescopic cylinder 614a and a mounting member 614b installed on the telescopic rod of the telescopic cylinder 614a. The mounting member 614b is installed on the cantilever 613 through a sliding track 614c. The clamping assembly 70 includes a clamping cylinder and two clamping blocks. The clamping cylinder drives the two clamping blocks to act relatively to clamp and release the transmission shaft 202.

[0042] Specifically, the detection mechanism 40 includes an installation groove 41 that matches the shape of the gear shaft, has an opening on the front side, and is vertically arranged, a first sensor 42 corresponding to the position above the installation groove 41, a second sensor 43 corresponding to the middle position of the installation groove 41, and a third sensor 44 corresponding to the position below the installation groove 41. The first sensor 42, the second sensor 43, and the third sensor 44 detect whether a gear shaft is installed at the corresponding part in the installation groove 41 to generate detection signals, and the processing unit 80 generates corresponding detection results based on the detection signals. Among them, the installation groove 41 includes a vertical groove 411 that matches the transmission shaft 202 in the gear shaft and a horizontal groove 412 that matches the gear 201. The first sensor 42, the second sensor 43, and the third sensor 44 respectively detect whether the upper end, the middle end, and the lower end of the transmission shaft 202 are in place to determine whether the gear shaft is successfully assembled. Among them, when the processing unit 80 receives three detection signals, it generates an assembly success signal, and when any one of the detection signals is missing, it generates an assembly error signal.

[0043] Reference Figure 2 , the assembly mechanism 30 includes a positioning table 31 for installing the transmission shaft 202, an installation groove 32 opened on the front side of the positioning table 31 with an upward opening, a fourth sensor 33 for detecting the transmission shaft 202 in the installation groove 32, a stamping die 34 that cooperates with the tabletop of the positioning table 31 and presses the gear 201 into the preset position of the transmission shaft 202, and a power source 35 that drives the stamping die 34 to perform a stamping action. The fourth sensor 33 detects whether the transmission shaft 202 is installed in the preset position of the installation groove 32. If so, it controls the power source to act to drive the stamping die 34 to press the gear 201 into the preset position of the transmission shaft 202, completing the assembly of the transmission shaft 202 and the gear 201. Among them, the power source 35 is a pneumatic cylinder.

[0044] Among them, the incoming material placement area 20 is an L-shaped stepped groove, and the side of the stepped groove adjacent to the assembly mechanism 30 is open.

[0045] Reference Figures 1 to 3, describe the working process of the assembly detection fixture 100 for the transmission shaft and gear of the present invention. When starting to work, place the transmission shaft 202 with the gear 201 sleeved thereon in the incoming material placement area 20. The incoming material sensor 81 detects the transmission shaft 202 with the gear 201 sleeved thereon and generates an incoming material signal. The processing unit 80 controls the movement of the robotic arm rotating shaft 60 according to this incoming material signal. The rotation driving part 62 of the robotic arm rotating shaft 60 drives the clamping assembly 70 to rotate towards the incoming material placement area 20, and the telescopic assembly 614 drives the clamping assembly 70 to perform a telescopic movement to the incoming material placement area 20. The processing unit 80 controls the action of the clamping assembly 70, and the clamping assembly 70 closes relatively to grasp the transmission shaft 202. The processing unit 80 controls the actions of the rotation driving part 62 and the telescopic assembly 614 to rotate and telescopically move the clamping assembly 70 to the installation groove 32 of the assembly mechanism 30. The processing unit 80 controls the action of the clamping assembly 70, and the clamping assembly 70 opens relatively to release the transmission shaft 202. The transmission shaft 202 moves into the installation groove 32, and then the processing unit 80 controls the telescopic assembly 614 to act to drive the clamping assembly 70 to retract.

[0046] The fourth sensor 33 detects the transmission shaft 202 and controls the power source 35 to act (the fourth sensor 33 can directly control the power source 35 or control the power source 35 through the processing unit 80). The power source 35 drives the stamping die 34 to press downward relative to the positioning groove 31 to press the gear 201 downward along the transmission shaft 202 onto the positioning table 31. The gear 201 is pressed to the corresponding position of the transmission shaft 202, and the power source drives the stamping die 34 to reset.

[0047] The processing unit 80 controls the telescopic assembly 614 to act to telescopically move the clamping assembly 70 to the installation groove 32 of the assembly mechanism 30. The processing unit 80 controls the action of the clamping assembly 70, and the clamping assembly 70 closes relatively to clamp the transmission shaft 202. The processing unit 80 controls the actions of the rotation driving part 62 and the telescopic assembly 614 to rotate and telescopically move the clamping assembly 70 to the installation groove 41 of the detection mechanism 40, controls the action of the clamping assembly 70 to release the transmission shaft 202, and the gear shaft is moved into the installation groove 41. The processing unit 80 controls the telescopic assembly 614 to reset and retract.

[0048] The processing unit 80 receives the detection signals transmitted by the first sensor 42, the second sensor 42, and the third sensor 44, and judges whether the gear shaft is successfully assembled according to this detection signal. If so, it is marked as a good product; if not, it is marked as a defective product.

[0049] If it is a qualified product, the processing unit 80 controls the rotation drive unit 62 and the telescopic assembly 614 to act, so as to rotate and telescopically move the clamping assembly 70 to the production conveyor belt 51, and controls the clamping assembly 70 to release the transmission shaft 202. The gear shaft is moved to the production conveyor belt 51 and waits for the production conveyor belt 51 to convey it out. The processing unit 80 controls the rotation drive unit 62 and the telescopic assembly 614 to act, so that the robotic arm rotating shaft 60 returns to the initial position.

[0050] If it is a defective product, the processing unit 80 controls the rotation drive unit 62 and the telescopic assembly 614 to act, so as to rotate and telescopically move the clamping assembly 70 to the defective product box 52, and controls the clamping assembly 70 to release the transmission shaft 202. The gear shaft is moved to the defective product box 52. The processing unit 80 controls the rotation drive unit 62 and the telescopic assembly 614 to act, so that the robotic arm rotating shaft 60 returns to the initial position.

[0051] Among them, the processing unit can generate corresponding control commands according to the timing to control the actuators such as the rotation drive unit 62, the telescopic assembly 614, and the clamping assembly 70, or can control the above-mentioned actuators according to external commands, or can generate corresponding control commands according to the feedback of the actuators to control the corresponding actuators, or can generate control commands according to the signals detected by the sensors to control the corresponding actuators.

[0052] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, the equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A detection fixture for assembling a transmission shaft and a gear, which is used to assemble the transmission shaft and the gear into a gear shaft and perform detection, and is characterized in that: It includes a frame, a feeding area, an assembling mechanism, a detecting mechanism, a finished product section, a robotic arm rotating shaft, and a clamping assembly. The feeding area places the transmission shaft with gears sleeved thereon. The assembling mechanism presses the gears to a preset position on the transmission shaft to assemble into a gear shaft. The detecting mechanism detects whether the gear shaft is assembled incorrectly. The finished product section is used to hold or convey the gear shaft. The robotic arm rotating shaft includes a robotic arm rotatably installed on the frame around a vertical rotating shaft and a rotation driving part for driving the robotic arm to rotate along the vertical rotating shaft. The clamping assembly is installed on the robotic arm and clamps and releases the transmission shaft with gears installed thereon. The feeding area, the assembling mechanism, the detecting mechanism, and the finished product section are sequentially arranged around the vertical rotating shaft, and the robotic arm rotating shaft drives the clamping assembly to rotate and move to the feeding area, the assembling mechanism, the detecting mechanism, or the finished product section to convey the gears and the transmission shaft. The robotic arm includes a cantilever rotatably installed on the frame around the vertical rotating shaft at a certain height and extending in the horizontal direction, and a telescopic assembly arranged on the cantilever and capable of horizontally telescoping relative to the cantilever. The telescopic assembly drives the clamping assembly to perform telescopic movement. The detecting mechanism includes an installation groove that matches the shape of the gear shaft, has an opening on the front side, and is vertically arranged, a first sensor corresponding to the upper position of the installation groove, a second sensor corresponding to the middle position of the installation groove, and a third sensor corresponding to the lower position of the installation groove. The first sensor, the second sensor, and the third sensor detect whether a gear shaft is installed at the corresponding position in the installation groove to generate detection signals.

2. The transmission shaft and gear assembly detection fixture according to claim 1, characterized in that: The finished product section includes a good product area and a defective product area. The good product area is used to hold or convey the successfully assembled gear shafts, and the defective product area is used to hold or convey the incorrectly assembled gear shafts.

3. The transmission shaft and gear assembly detection fixture according to claim 2, wherein: The good product area has a production conveyor belt for carrying and conveying the successfully assembled gear shafts, and the defective product area is equipped with a defective product box for holding the incorrectly assembled gear shafts.

4. The drive shaft and gear assembly detection fixture according to claim 2, wherein: It further includes a processing unit. The processing unit controls the actions of the assembling mechanism, the detecting mechanism, the robotic arm rotating shaft, and the clamping assembly, controls the robotic arm rotating shaft and the clamping assembly to sequentially convey the transmission shaft with gears installed thereon to the assembling mechanism and the detecting mechanism. The detecting mechanism detects whether the gear shaft is assembled incorrectly. If so, it is marked as a defective product; if not, it is marked as a good product. The processing unit controls the actions of the robotic arm rotating shaft and the clamping assembly to convey the defective products to the defective product area and the good products to the good product area.

5. The drive shaft and gear assembly detection fixture according to claim 4, characterized in that: It further includes a feeding sensor. The feeding sensor detects whether a transmission shaft with gears sleeved thereon is placed at a preset position in the feeding area and generates a feeding signal when a transmission shaft with gears sleeved thereon is placed at the preset position in the feeding area. The processing unit controls the corresponding actions of the assembling mechanism, the detecting mechanism, the robotic arm rotating shaft, and the clamping assembly according to the feeding signal.

6. The transmission shaft and gear assembly detection fixture according to claim 4, wherein: The processing unit generates corresponding detection results based on the detection signals.

7. The transmission shaft and gear assembly detection fixture according to claim 6, characterized in that: The processing unit generates an assembly success signal when receiving three detection signals and generates an assembly error signal when any one of the detection signals is missing.

8. The transmission shaft and gear assembly detection fixture according to claim 1, characterized in that: The assembly mechanism includes a positioning table for installing a transmission shaft, an installation groove formed on the front side of the positioning table and opening upward, a stamping die that cooperates with the tabletop of the positioning table to press a gear into a preset position of the transmission shaft, and a power source that drives the stamping die to perform a stamping action.

9. The drive shaft and gear assembly detection fixture according to claim 8, wherein: The assembly mechanism further includes a fourth sensor for detecting the transmission shaft in the installation groove. The fourth sensor detects whether a transmission shaft is installed at a preset position in the installation groove. If so, it controls the power source to act to drive the stamping die to press the gear into the preset position of the transmission shaft, completing the assembly of the transmission shaft and the gear.

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