A device and method for riveting a throttle shaft

Abstract

The application belongs to the technical field of throttle shaft assembly, and discloses a throttle shaft riveting device and a riveting method, wherein the riveting device comprises a supporting and positioning device, a toggle press device and a riveting head device; the supporting and positioning device can be fixedly connected with a riveting machine; the toggle press device is arranged on the supporting and positioning device and can press the assembly when the throttle body subassembly and the throttle rocker arm are preassembled; the riveting head device is tightly connected with a power head of the riveting machine, and the riveting head device realizes riveting of the throttle shaft; specifically, the throttle body subassembly is assembled by the throttle shaft and the throttle body, the throttle body subassembly and the throttle rocker arm are preassembled and arranged on the supporting and positioning device, are pressed by the toggle press device, and then the riveting head device realizes riveting of the throttle shaft and the throttle rocker arm in the throttle body subassembly. The application can realize the sequence requirement that the throttle shaft is assembled with the throttle body subassembly first and then assembled with the throttle rocker arm, and can reduce the possibility of interference of the structure.

Description

Technical Field

[0001] This invention belongs to the field of throttle body shaft assembly technology, specifically relating to a throttle body shaft riveting device and riveting method. Background Technology

[0002] Currently, there are various ways to connect the throttle shaft and the throttle rocker arm, such as threaded connection, riveting, and welding. Among these, riveting is still widely used because it provides uniform force transmission, good plasticity and toughness, and can withstand impact and vibration loads. It is particularly advantageous for connecting dissimilar metals and components with poor weldability. However, riveting the throttle shaft also has its drawbacks. For example, as a component, the throttle shaft is first riveted to the throttle rocker arm, and then the riveted throttle shaft rocker arm assembly is assembled to the throttle body. This can easily lead to structural interference and make it difficult to press in bearings and install retaining rings.

[0003] Therefore, a new technology is needed to solve the problem that the improper sequence of assembling the throttle shaft with the throttle rocker arm before assembling it with the throttle body in the existing technology can easily cause structural interference. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides a throttle shaft riveting device, which can effectively solve the problem of structural interference caused by an inappropriate throttle shaft riveting assembly sequence, and meets the requirement that the throttle shaft be first assembled with the throttle body as a sub-assembly and then riveted with the throttle rocker arm.

[0005] The present invention adopts the following technical solution:

[0006] A throttle body shaft riveting device includes a support positioning device, an elbow clamping device, and a riveting head device. The support positioning device can be connected and fixed to a riveting machine. The elbow clamping device is disposed on the support positioning device and can clamp the throttle body sub-assembly and the throttle rocker arm components during pre-assembly. The riveting head device is fastened to the power head of the riveting machine, and the riveting head device realizes the riveting of the throttle body shaft.

[0007] The throttle body sub-assembly is composed of a throttle shaft and a throttle body assembly. The throttle body sub-assembly and the throttle rocker arm are pre-assembled and placed on the support positioning device, pressed by the elbow clamping device, and then riveted by the riveting device to connect the throttle shaft and the throttle rocker arm in the throttle body sub-assembly.

[0008] Furthermore, it also includes a riveting force measuring device, which includes a transmission rod, a pressure sensor, and a digital display device; the pressure sensor is disposed on the support positioning device; the pressure sensor has a first slot, and the transmission rod is disposed on the first slot; when the throttle body sub-assembly is riveted to the throttle rocker arm, the throttle shaft in the throttle body sub-assembly transmits the riveting force to the pressure sensor by pressing the transmission rod, the pressure sensor is connected to the digital display device, and the pressure sensor transmits the riveting force value to the digital display device.

[0009] Furthermore, it also includes an auxiliary protection device, which includes a protection rod that matches the diameter of the throttle body cavity in the throttle body sub-assembly, and then engages with the opening groove on the throttle shaft in the throttle body sub-assembly.

[0010] Furthermore, the support and positioning device includes a support assembly and a positioning pin assembly. The support assembly can be connected and fixed to a riveting machine, and the positioning pin assembly can fix the throttle body sub-assembly on the support assembly.

[0011] Furthermore, the support assembly includes a base plate, a support plate, and a top plate. The base plate can be connected and fixed to a riveting machine, the support plate is disposed on the base plate, and the top plate is disposed on the support plate. The positioning pin assembly includes a positioning pin, which can fix the throttle body sub-assembly to the top plate.

[0012] Furthermore, the base plate is provided with a first fixing hole for connection and fixation with a riveting machine; the base plate is provided with a first connecting hole for connection with a toggle clamping device;

[0013] The top plate is provided with a second connecting hole for connection and fixation with the support plate; the top plate is provided with a damping hole that matches the lower end protrusion of the throttle body sub-assembly; the top plate is provided with a positioning hole that matches the positioning pin; the top plate is provided with a through hole that matches the throttle shaft; and the top plate is provided with a second fixing hole for connection and fixation with a riveting machine.

[0014] Furthermore, the toggle clamping device includes a drive mechanism and a movable clamping mechanism. The drive mechanism is mounted on the support positioning device and is connected to the movable clamping mechanism. The drive mechanism drives the movable clamping mechanism to clamp or loosen the throttle body sub-assembly and the components of the throttle rocker arm during pre-assembly.

[0015] Furthermore, the driving mechanism is a cylinder.

[0016] Furthermore, the riveting device is a riveting head.

[0017] Another object of the present invention is to provide a riveting method for a throttle body riveting device, comprising the following steps:

[0018] S1. Install the throttle body shaft riveting device;

[0019] S2. Pre-assemble and fix the throttle body sub-assembly and throttle rocker arm on the support and positioning device;

[0020] S3. Use the toggle clamping device to clamp the pre-assembled throttle body sub-assembly and throttle rocker arm.

[0021] S4. Use a riveting device to rivet the throttle shaft and throttle rocker arm in the throttle body sub-assembly.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: Specifically, the throttle body sub-assembly is composed of a throttle shaft and a throttle body assembly. The throttle body sub-assembly and the throttle rocker arm are pre-assembled and set on the support positioning device, pressed by the elbow clamping device, and then riveted by the riveting device to realize the riveting of the throttle shaft and the throttle rocker arm in the throttle body sub-assembly. The present invention can realize the sequential requirement of throttle shaft first assembling with the throttle body sub-assembly and then assembling and riveting with the throttle rocker arm, reducing the possibility of structural interference and facilitating the pressing in of bearings and assembly of retaining rings. In this assembly mode, the throttle shaft does not need to rely on clamps for holding, thus it is not limited by the spatial layout and does not need to reserve the position of the process groove. Attached Figure Description

[0023] The technology of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0024] Figure 1 This is an exploded view of the overall structure;

[0025] Figure 2 This is a schematic diagram of the overall structure assembly;

[0026] Figure 3 It is a cross-sectional view of the overall structure;

[0027] Figure 4 This is a top view of the overall structure;

[0028] Figure 5 It is an isometric drawing of the auxiliary protection device;

[0029] Figure 6 This is a front view of the throttle body shaft.

[0030] Figure label:

[0031] 1-Support positioning device; 11-Support assembly; 111-Base plate; 1111-First fixing hole; 1112-First connecting hole; 1113-Third connecting hole; 112-Support plate; 113-Top plate; 1131-Second connecting hole; 1132-Interference reduction hole; 1133-Positioning hole; 1134-Through hole; 1135-Second fixing hole; 12-Positioning pin assembly; 121-Positioning pin; 1211-Head; 1212-Shaft; 2-Toggle clamping device; 21-Drive mechanism; 211-Cylinder; 22-Modible clamping mechanism; 221-Connecting rod; 222-Pressure plate; 223-Connecting plate; 224-Support; 22 5-Connecting pin; 226-Retaining ring; 227-Bolt connector; 3-Riveting head device; 31-Riveting head; 4-Riveting force measuring device; 41-Transmission rod; 42-Pressure sensor; 421-First hole groove; 43-Digital display device; 431-Data cable; 44-Connector; 5-Auxiliary protection device; 51-Protective rod; 511-Handle; 512-Auxiliary positioning head; 513-Protective groove; 514-Interval plate; 6-Throttle body sub-assembly; 61-Throttle body; 611-Throttle body cavity diameter; 612-Motor hole; 62-Throttle shaft; 621-Opening groove; 63-Protrusion; 7-Throttle rocker arm; 8-Riveting machine power head. Detailed Implementation

[0032] The following will provide a clear and complete description of the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of the present invention. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The same reference numerals used throughout the accompanying drawings indicate the same or similar parts.

[0033] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "up," "down," "left," and "right" used in this invention are only relative to the relative positional relationships of the various components of the invention in the accompanying drawings.

[0034] Reference Figures 1 to 6 A throttle body shaft riveting device includes a support positioning device 1, an elbow clamping device 2, and a riveting head device 3. The support positioning device 1 can be connected and fixed to a riveting machine. The elbow clamping device 2 is disposed on the support positioning device 1 and can clamp the throttle body sub-assembly 6 and the throttle rocker arm 7 during pre-assembly. The riveting head device 3 is fastened to the power head 8 of the riveting machine, and the riveting head device 3 realizes the riveting of the throttle body shaft 62.

[0035] The throttle body subassembly 6 is composed of a throttle body shaft 62 and a throttle body 61. The throttle body subassembly 6 and the throttle rocker arm 7 are pre-assembled and positioned on the support positioning device 1, and then pressed by the toggle clamping device 2. Finally, the rivet head device 3 rivets the throttle body subassembly 6 to the throttle body shaft 62 and the throttle rocker arm 7. This invention allows for the sequential assembly of the throttle body shaft 62 with the throttle body 61 first, followed by the assembly of the throttle body subassembly 6, and then the riveting of the throttle body shaft 62 to the throttle rocker arm 7. This eliminates the need to consider the arrangement of the riveting groove and the resulting reduction in strength when designing the throttle body shaft 62.

[0036] In one embodiment, a riveting force measuring device 4 is further included. The riveting force measuring device 4 includes a transmission rod 41, a pressure sensor 42, and a digital display device 43. The pressure sensor 42 is mounted on the support positioning device 1. The pressure sensor 42 has a first slot 421, and the transmission rod 41 is mounted on the first slot 421. When the throttle body subassembly 6 is riveted to the throttle rocker arm 7, the throttle shaft 62 in the throttle body subassembly 6 transmits the riveting force to the pressure sensor 42 by pressing against the transmission rod 41. The pressure sensor 42 is connected to the digital display device 43, and transmits the riveting force value to the digital display device 43. Specifically, the digital display device 43 and the pressure sensor 42 are connected via a data cable 431. Specifically, the riveting force measuring device 4 can monitor whether the throttle shaft 62 is deformed or not properly riveted during the riveting process, ensuring the assembly and use quality of the throttle shaft 62.

[0037] In one embodiment, an auxiliary protection device 5 is also included. The auxiliary protection device 5 includes a protection rod 51, which matches the throttle body cavity diameter 611 in the throttle body sub-assembly 6, and further engages with the opening slot 621 on the throttle shaft 62 in the throttle body sub-assembly 6. Further, the protection rod 51 comprises a handle 511, an auxiliary positioning head 512, a protective groove 513, and a retaining plate 514. The protection rod 51 is a stepped cylindrical metal protection rod. Before riveting, the protection rod 51 is inserted into the throttle body cavity diameter 611, so that the protective groove 513, the retaining plate 514, and the opening slot 621 of the throttle shaft 62 achieve a tight fit. This effectively prevents deformation of the throttle shaft 62 due to excessive rotational pressure during the riveting process of the riveting head 31 connecting the throttle shaft 62 to the throttle rocker arm 7.

[0038] In one embodiment, the support positioning device 1 includes a support assembly 11 and a positioning pin assembly 12. The support assembly 11 can be connected and fixed to a riveting machine, and the positioning pin assembly 12 can fix the throttle body sub-assembly 6 onto the support assembly 11.

[0039] In one embodiment, the support assembly 11 includes a base plate 111, a support plate 112, and a top plate 113. The base plate 111 can be connected and fixed to a riveting machine, the support plate 112 is disposed on the base plate 111, and the top plate 113 is disposed on the support plate 112. The positioning pin assembly 12 includes a positioning pin 121, which can fix the throttle body sub-assembly 6 to the top plate 113. Further, the pressure sensor 42 is disposed on the base plate 111, and the base plate 111 is provided with a third connecting hole 1113. The pressure sensor 42 is fixed to the third connecting hole 1113 through a connector 44. Further, there are two support plates 112, which are vertically arranged and support the top plate 113. The enclosed space formed by them can accommodate the storage of the pressure sensor 42. Specifically, the pressure sensor 42 is a spoke-type pressure sensor. The pressure sensor 42 is fixed on the base plate 111 of the support and positioning device 1 by the connector 44. The transmission rod 41 is placed in the first slot 421 of the pressure sensor 42, and contacts the end of the throttle shaft 62 of the throttle body sub-assembly 6 and receives the riveting pressure. The transmission rod 41 can be matched with the corresponding shape and length according to different throttle shafts 62. The riveting pressure is transmitted to the digital display device 43 through the data line 431 and displayed by the digital display device 43. The digital display device 43 is a digital pressure gauge. The digital pressure gauge can be set with upper and lower limits and automatically judges whether the actual riveting pressure exceeds the tolerance.

[0040] In one embodiment, the base plate 111 is provided with a first fixing hole 1111 for connection and fixation with a riveting machine; further, the first fixing hole 1111 is a U-shaped through hole; there are two first fixing holes 1111, each located at one end of the base plate 111.

[0041] The base plate 111 is provided with a first connection hole 1112 for connecting to the toggle clamping device 2; there are four first connection holes 1112.

[0042] The top plate 113 is provided with a second connecting hole 1131 for connection and fixation with the support plate 112; further, there are four second connecting holes 1131; through the second connecting holes 1131, the top plate 113 and the support plate 112 are connected by a connector.

[0043] The top plate 113 is provided with interference reduction holes 1132 that match the lower end protrusion 63 of the throttle body sub-assembly 6; further, there are two interference reduction holes 1132; specifically, the main function of the interference reduction holes is to prevent structural interference between the throttle body sub-assembly 6 and the top plate 113, and also to play a limiting role.

[0044] The top plate 113 is provided with a positioning hole 1133 that matches the positioning pin 121; further, the positioning hole 1133 is provided; further, the positioning pin includes a head 1211 and a shaft portion 1212, the head 1211 is connected to the shaft portion 1212, the head 1211 is matched and fixed with the motor hole 612 of the throttle body 61, and the shaft portion 1211 matches the positioning hole 1133;

[0045] The top plate 113 is provided with a through hole 1134 that matches the throttle shaft 62; further, the through hole 1134 is provided with one diameter that matches the diameter of the throttle shaft 62 and the diameter of the transmission rod 41.

[0046] The top plate 113 is provided with a second fixing hole 1135 for connection and fixation with a riveting machine; further, the second fixing hole 1135 is provided in the form of a U-shaped through hole.

[0047] In one embodiment, the elbow clamping device 2 includes a drive mechanism 21 and a movable clamping mechanism 22. The drive mechanism 21 is disposed on the support positioning device 1. The drive mechanism 21 is connected to the movable clamping mechanism 22, and the drive mechanism 21 drives the movable clamping mechanism 22 to clamp or loosen the components of the throttle body sub-assembly 6 and the throttle rocker arm 7 during pre-assembly. Further, the driving mechanism 21 is a cylinder, and the movable pressing mechanism 22 includes a connecting rod 221, a pressure plate 222, a connecting plate 223, and a support 224. One end of the connecting rod 221 is connected to the pressure plate 222 via a connecting pin 225 and is provided with a retaining ring 226 to reduce loosening. The other end of the connecting rod 221 is movably connected to the chamber of the cylinder 211. The support 224 is connected to the pressure plate 222 via the connecting plate 223. Specifically, one end of the connecting plate 223 is connected to the pressure plate 222 via a connecting pin 225 and is provided with a retaining ring 226 to reduce loosening. The other end of the connecting plate 223 is connected to the support 224 via a connecting pin 225 and is provided with a retaining ring 226 to reduce loosening. In this embodiment, there are three connecting pins 225, three retaining rings 226, and two connecting plates 223. Furthermore, the toggle clamping device 2 also includes bolt connectors 227. Four bolt connectors 227 are provided. Two bolt connectors 227 directly connect the cylinder 211 to the support positioning device 1. Two bolt connectors 227 first connect the support 224 to the cylinder 211, and then connect and fix the cylinder 211 to the support positioning device 1. Specifically, the bolt connectors 227 will ultimately match and connect with the first connecting hole 1112 on the base plate 111. In actual operation, the cylinder 211 pushes the connecting rod 221 upwards, ultimately causing the pressure plate 222 to clamp and fix the throttle rocker arm 7 and the throttle body sub-assembly 6.

[0048] In one embodiment, the riveting head device 3 is a riveting head 31; further, the riveting head 31 is connected and fixed to the riveting machine power head 8; after the riveting machine is turned on, the power head of the riveting machine, together with the riveting head, can move up and down and rotate, serving as the power source for riveting the throttle shaft 62 and the throttle rocker arm 7.

[0049] Another object of the present invention is to provide a riveting method for a throttle body riveting device, comprising the following steps:

[0050] S1. Install the throttle body shaft riveting device;

[0051] S2. Pre-assemble and fix the throttle body sub-assembly 6 and throttle rocker arm 7 onto the support and positioning device 1;

[0052] S3. Use the toggle clamping device 2 to clamp the pre-assembled throttle body sub-assembly 6 and throttle rocker arm 7.

[0053] S4. The throttle shaft 62 in the throttle body sub-assembly 6 is riveted to the throttle rocker arm 7 using the riveting device 3.

[0054] In another embodiment, a riveting method for a throttle body shaft riveting device includes the following steps:

[0055] S1. Install the throttle body shaft riveting device;

[0056] S2. Pre-assemble and fix the throttle body sub-assembly 6 and throttle rocker arm 7 onto the support and positioning device 1;

[0057] S3. Use the toggle clamping device 2 to clamp the pre-assembled throttle body sub-assembly 6 and throttle rocker arm 7.

[0058] S4. The throttle shaft 62 in the throttle body sub-assembly 6 is riveted to the throttle rocker arm 7 using the riveting device 3.

[0059] S5. During the riveting process, the riveting pressure is transmitted to the pressure sensor 42 through the transmission rod 41, and the pressure sensor 42 then transmits the riveting pressure value to the digital display device 43.

[0060] S6. The digital display device 43 judges the riveting pressure value;

[0061] S7. Obtain the results.

[0062] In one embodiment, the throttle shaft riveting device is first fixed on the riveting machine, requiring the riveting head 31 of the device to be tightly connected to the power head 8 of the riveting machine. After the through hole 1134 of the device is aligned with the riveting head 31, the base plate 111 is clamped to the worktable of the riveting machine.

[0063] Next, the auxiliary protection device 5 is inserted into the throttle body cavity 611, so that the protective groove 513, the interlayer plate 514 and the opening groove 621 of the throttle shaft 62 can be mutually fitted; then the throttle body sub-assembly 6 is placed on the top plate 113 of the throttle shaft riveting device, so that the motor hole 612 of the throttle body 61 is engaged with the positioning pin 121, the throttle shaft 62 is inserted into the through hole 1134, and contacts the pressure sensor 42 through the transmission rod 41;

[0064] Next, cylinder 21 moves first, driving the pressure plate 222 to press the throttle rocker arm 7 and throttle body sub-assembly 6 upward via connecting rod 221. Then, the riveting head 8 moves, driving the riveting head 31 to rotate downward and contact the upper end of the throttle shaft 62 directly below, thus beginning the riveting process. The throttle shaft 62 is subjected to riveting pressure, which is transmitted to the pressure sensor 42 via the transmission rod 41. The pressure sensor 42 transmits the real-time riveting pressure value to the digital display device 43 via the data line 431. The digital display device 43 displays the specific data. Once the riveting pressure is qualified, the rotation stops and the head moves upward, completing one riveting cycle.

[0065] During the riveting process, the digital pressure gauge can be set to an appropriate pressure range to automatically determine whether the riveting pressure exceeds the tolerance. If the pressure is not up to standard, a red light will be displayed and an alarm will sound. This effectively prevents defective products such as throttle shaft 62 that are deformed due to excessive riveting force or not riveted properly due to insufficient riveting force from leaving the factory, thus ensuring the assembly and use quality of throttle shaft 62.

[0066] Other aspects of the throttle shaft riveting device described in this invention are described in the prior art and will not be repeated here.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A throttle body shaft riveting device, characterized in that, It includes a support positioning device, an elbow clamping device, and a riveting head device; the support positioning device can be connected and fixed to a riveting machine; the elbow clamping device is set on the support positioning device and can clamp the throttle body sub-assembly and the components during the pre-assembly of the throttle rocker arm; the riveting head device is fastened to the power head of the riveting machine and realizes the riveting of the throttle shaft. The throttle body sub-assembly is composed of a throttle shaft and a throttle body assembly. The throttle body sub-assembly and the throttle rocker arm are pre-assembled and set on the support positioning device, pressed by the elbow clamping device, and then riveted by the riveting device to realize the riveting of the throttle shaft and the throttle rocker arm in the throttle body sub-assembly. It also includes an auxiliary protection device, which includes a protection rod that matches the diameter of the throttle body cavity in the throttle body sub-assembly, and then engages with the opening groove on the throttle shaft in the throttle body sub-assembly.

2. The throttle body shaft riveting device according to claim 1, characterized in that, It also includes a riveting force measuring device, which includes a transmission rod, a pressure sensor, and a digital display device; the pressure sensor is mounted on the support positioning device; the pressure sensor has a first slot, and the transmission rod is mounted on the first slot; when the throttle body sub-assembly is riveted to the throttle rocker arm, the throttle shaft in the throttle body sub-assembly transmits the riveting force to the pressure sensor by pressing the transmission rod, the pressure sensor is connected to the digital display device, and the pressure sensor transmits the riveting force value to the digital display device.

3. The throttle body shaft riveting device according to claim 1, characterized in that, The support and positioning device includes a support assembly and a positioning pin assembly. The support assembly can be connected and fixed to a riveting machine, and the positioning pin assembly can fix the throttle body sub-assembly on the support assembly.

4. The throttle body shaft riveting device according to claim 3, characterized in that, The support assembly includes a base plate, a support plate, and a top plate. The base plate can be connected and fixed to a riveting machine. The support plate is disposed on the base plate, and the top plate is disposed on the support plate. The positioning pin assembly includes a positioning pin, which can fix the throttle body sub-assembly to the top plate.

5. The throttle body shaft riveting device according to claim 4, characterized in that, The base plate is provided with a first fixing hole for connection and fixation to the riveting machine; the base plate is provided with a first connecting hole for connection to the toggle clamping device; The top plate is provided with a second connecting hole for connection and fixation with the support plate; the top plate is provided with a damping hole that matches the lower end protrusion of the throttle body sub-assembly; the top plate is provided with a positioning hole that matches the positioning pin; the top plate is provided with a through hole that matches the throttle shaft; and the top plate is provided with a second fixing hole for connection and fixation with a riveting machine.

6. The throttle body shaft riveting device according to claim 1, characterized in that, The toggle clamping device includes a drive mechanism and a movable clamping mechanism. The drive mechanism is mounted on the support positioning device and is connected to the movable clamping mechanism. The drive mechanism drives the movable clamping mechanism to clamp or loosen the throttle body sub-assembly and the components of the throttle rocker arm during pre-assembly.

7. The throttle body shaft riveting device according to claim 6, characterized in that, The driving mechanism is a cylinder.

8. The throttle body shaft riveting device according to claim 1, characterized in that, The riveting device is a riveting head.

9. A riveting method for a throttle body shaft riveting device, based on the throttle body shaft riveting device according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Install the throttle body shaft riveting device; S2. Pre-assemble and fix the throttle body sub-assembly and throttle rocker arm on the support and positioning device; S3. Use the toggle clamping device to clamp the pre-assembled throttle body sub-assembly and throttle rocker arm. S4. Use a riveting device to rivet the throttle shaft and throttle rocker arm in the throttle body sub-assembly.

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