A transmission output shaft nut anti-loosening structure

Abstract

This utility model belongs to the field of transmission technology and discloses a transmission output shaft nut anti-loosening structure, including a flange sleeved on the outer surface of the transmission output shaft. A pressure plate is provided at one end of the transmission output shaft and is fixedly connected to the flange by fasteners. A connector and a locking plate are provided at the end of the pressure plate away from the fasteners. The connector is nested inside the locking plate, so that the connector and the locking plate are interlocked. The locking plate includes a first locking plate and a second locking plate. The second locking plate is embedded into the notch position on the pressure plate by riveting. Even if the interference fit between the first locking plate and the connector becomes slightly loose due to long-term use or extreme working conditions, the connection between the second locking plate and the pressure plate can still play a fixing role, which greatly enhances the stability of the entire structure, improves the reliability of operation, and solves the problem that the flange nut cannot be effectively prevented from loosening under harsh working conditions in the prior art.

Description

Technical Field

[0001] This utility model belongs to the field of transmission technology and relates to a transmission output shaft nut anti-loosening structure. Background Technology

[0002] The flange is a power output component located at the end of the gearbox output shaft, connected to the shaft via a spline to output speed and torque. Currently, the axial positioning method for gearbox output flanges both domestically and internationally mainly involves using flange nuts to axially tighten the output flange. During vehicle operation, due to factors such as vibration, the torque of the flange nut may decrease, leading to loosening and oil leakage, which is common in harsh operating environments such as mining areas and construction sites.

[0003] Common methods for preventing flange nuts from loosening include riveting or pressing. This involves deforming the flange of the nut by riveting or pressing, causing the deformed portion to embed into a notch on the output shaft, thus preventing the flange nut from rotating. However, under harsh operating conditions, this method cannot effectively prevent flange nuts from loosening; only mechanical limiting can prevent them from rotating and loosening. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a transmission output shaft nut anti-loosening structure. The flange nut is divided into two parts: a connecting piece and a pressure plate. A locking plate is added. The pressure plate is connected to the transmission output shaft by fasteners. The locking plate mechanically locks the connecting piece and the pressure plate by riveting, thereby achieving permanent anti-loosening.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a transmission output shaft nut anti-loosening structure, including a flange sleeved on the outer surface of the transmission output shaft. One end of the transmission output shaft is provided with a pressure plate, which is fixedly connected to the flange by fasteners. The end of the pressure plate away from the fasteners is provided with a connector and a locking piece, and the connector is nested inside the locking piece.

[0006] Furthermore, a sealing element is provided at one end of the pressure plate near the fastener, and the sealing element is fixedly installed in the mounting groove inside the flange.

[0007] Furthermore, the locking plate includes a first locking plate and a second locking plate, wherein the first locking plate is adapted to the connecting member, and the second locking plate is fixedly installed at one end of the first locking plate.

[0008] Furthermore, the transmission output shaft is splinedly connected to the flange.

[0009] Furthermore, the flange and fasteners are interference-fitted, and the fasteners and pressure plate are clearance-fitted.

[0010] Furthermore, the transmission output shaft is threadedly connected to the connector.

[0011] Furthermore, the locking piece is embedded into the pressure plate by riveting.

[0012] Furthermore, the sealing element is an O-ring.

[0013] Furthermore, the fastener is a cylindrical pin.

[0014] Furthermore, the connector is a nut.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: This utility model discloses an anti-loosening structure for the output shaft nut of a transmission. A pressure plate is set at one end of the transmission output shaft, and the pressure plate is fixedly connected to a flange using fasteners. A connector and a locking plate are set at the end of the pressure plate away from the fasteners, and the connector is nested inside the locking plate, so that the connector and the locking plate are interlocked. The flange and the output shaft are connected by a spline, which prevents circumferential rotation. This effectively prevents the connector from rotating in a vibration environment and avoids the problem of axial positioning failure of the flange due to loose connector, thus greatly improving the stability of the transmission output shaft connection.

[0016] This utility model discloses a transmission output shaft nut anti-loosening structure. A sealing element is provided at the end of the pressure plate near the fastener. During the operation of the transmission, it effectively prevents internal lubricating oil leakage, avoids problems such as insufficient lubrication and accelerated wear caused by oil leakage, and extends the service life of the transmission.

[0017] This utility model discloses a transmission output shaft nut anti-loosening structure. The locking plate includes a first locking plate and a second locking plate. The second locking plate is embedded in the notch position on the pressure plate by riveting, which further restricts the movement freedom of the locking plate and the connecting parts. Even if the interference fit between the first locking plate and the connecting parts becomes slightly loose due to long-term use or extreme working conditions, the connection between the second locking plate and the pressure plate can still play a fixing role, which greatly enhances the stability of the entire structure and improves the reliability of operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the anti-loosening structure for the output shaft nut of a transmission according to the present invention; Figure 2 This is a cross-sectional view of a transmission output shaft nut anti-loosening structure according to the present invention; Figure 3 This is an exploded view of an anti-loosening structure for a transmission output shaft nut according to the present invention. Figure 4 This is a schematic diagram of the locking plate structure before riveting in an embodiment of this utility model; Figure 5This is a schematic diagram of the locking plate structure after riveting and punching in an embodiment of this utility model; Figure 6 This is a schematic diagram of the locked and anti-rotation state of the anti-loosening structure of the output shaft nut of the transmission according to the present invention.

[0019] Figure label: 1-Gearbox output shaft; 2-Flange; 3-Connector; 4-Pressure plate; 5-Locking plate; 6-Fastener; 7-Seal. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0021] Example 1 A transmission output shaft nut anti-loosening structure, such as Figure 1 As shown, it includes a flange 2 sleeved on the outer surface of the transmission output shaft 1. One end of the transmission output shaft 1 is provided with a pressure plate 4, which is fixedly connected to the flange 2 by fasteners 6. The end of the pressure plate 4 away from the fasteners 6 is provided with a connector 3 and a locking piece 5. The connector 3 is nested inside the locking piece 5.

[0022] Specifically, such as Figure 2 As shown, the transmission output shaft nut anti-loosening structure consists of a transmission output shaft 1, a flange 2, a connecting piece 3, a pressure plate 4, a locking plate 5, a fastener 6, and a seal 7. The connecting piece 3 and the pressure plate 4 are mechanically locked together by the riveted locking plate 5, thus achieving permanent anti-loosening.

[0023] The transmission output shaft 1 is housed within the flange 2, and the transmission output shaft 1 is splined to the flange 2. The spline connection has multiple teeth, which can distribute the load and withstand greater torque. This allows the transmission output shaft 1 to reliably transmit the powerful force generated by the engine to the flange 2, thereby driving the subsequent transmission components to work and meeting the vehicle's demand for high torque under various operating conditions, such as starting, acceleration, and climbing.

[0024] The flange 2 is provided with a mounting groove, and the seal 7 is disposed in the mounting groove and fixedly connected to the transmission output shaft 1. It should be noted that the seal 7 is installed on the end of the pressure plate 4 near the fastener 6. The mounting groove provides a precise installation position for the seal 7, allowing it to fit tightly against the transmission output shaft 1 and the flange 2 to ensure a seal at the end of the transmission output shaft 1.

[0025] In this embodiment, the fastener 6 is a cylindrical pin, and there is only one fastener 6. The fastener 6 is installed in the mounting hole on the flange 2, and the flange 2 and the fastener 6 are interference-fitted. Through the interference fit, the fastener 6 and the flange 2 form a tight integral. This helps to improve the rigidity and strength of the entire device and reduce stress concentration and fatigue damage caused by the relative movement between components.

[0026] The pressure plate 4 is fitted onto the fastener 6 with a clearance fit. This clearance fit allows for movement between the pressure plate 4 and the fastener 6, eliminating the need for precise alignment during installation. The pressure plate 4 can simply be roughly fitted onto the fastener 6, significantly reducing installation difficulty and time costs. Similarly, during disassembly, the pressure plate 4 can be easily removed from the fastener 6 without the need for complex tools or excessive force, improving equipment maintenance and repair efficiency.

[0027] The connector 3 is fixedly mounted on the transmission output shaft 1 via a threaded connection. This threaded connection provides strong axial and circumferential constraints to both the connector 3 and the transmission output shaft 1. In the axial direction, the preload of the thread ensures that the connector 3 is firmly attached to one end of the transmission output shaft 1, preventing it from sliding or falling off axially. In the circumferential direction, the toothed structure of the thread effectively transmits torque, ensuring that the connector 3 rotates synchronously with the transmission output shaft 1, preventing power transmission interruption or component damage due to relative rotation.

[0028] The locking plate 5 and the connecting piece 3 are interference-fitted. The locking plate 5 includes a first locking plate and a second locking plate. The first locking plate is adapted to the connecting piece 3, and the second locking plate is fixedly installed at one end of the first locking plate. The first locking plate and the second locking plate are an integral structure. The first locking plate is a regular hexagon. The first locking plate and the connecting piece 3 are circumferentially locked and cannot rotate relative to each other. The second locking plate is embedded into the notch position on the pressure plate 4 by riveting. Figure 4 He Ru Figure 5 As shown, Figure 4 This is a schematic diagram of the structure before the locking plate is riveted. Figure 5 This is a schematic diagram of the structure after the locking plate is riveted. The second locking plate, through riveting, is embedded in the notch on the pressure plate 4, forming a double guarantee with the first locking plate for circumferential locking of the connecting piece 3. After riveting, the second locking plate is tightly integrated with the pressure plate 4, further restricting the degree of freedom of movement of the locking plate 5 and the connecting piece 3. Even if the interference fit between the first locking plate and the connecting piece 3 becomes slightly loose due to long-term use or extreme working conditions, the connection between the second locking plate and the pressure plate 4 can still play a fixing role, greatly enhancing the stability of the entire structure and improving operational reliability.

[0029] In this embodiment, the sealing element 7 is an O-ring, the fastener 6 is a cylindrical pin, and the connecting element 3 is a nut. In summary, this utility model divides the existing flange nut into two parts: the connecting element 3 and the pressure plate 4, and adds a locking piece 5. The pressure plate 4 is connected to the transmission output shaft 1 via the fastener 6, and the locking piece 5 mechanically locks the connecting element 3 and the pressure plate 4 together via a riveting punch, thereby achieving permanent anti-loosening.

[0030] A method for using a transmission output shaft nut anti-loosening structure includes the following steps: First, flange 2 is mounted onto the transmission output shaft 1, and flange 2 is splined to the transmission output shaft 1. The spline connection provides good guidance, making it easy to quickly and accurately install flange 2 into the designated position on the transmission output shaft 1, thus improving assembly efficiency.

[0031] Then, the seal 7 is installed into the mounting grooves of the transmission output shaft 1 and the flange 2 to ensure the seal at the end of the transmission output shaft 1. When the seal 7 is installed in the mounting groove and compressed, it generates an elastic restoring force, which effectively prevents the leakage of lubricating oil inside the transmission and the entry of external dust, moisture and other impurities, ensuring the sealing performance of the end of the transmission output shaft 1 and extending the service life of the equipment.

[0032] Then, fastener 6 is installed into the mounting hole on flange 2. Fastener 6 and flange 2 are interference-fitted to prevent fastener 6 from falling off. During installation, fastener 6 is pressed into the mounting hole by external force, such as... Figure 3 As shown.

[0033] Then, the pressure plate 4 is installed. The pressure plate 4 and the fastener 6 are clearance-fitted, and the fastener 6 prevents the pressure plate 4 from rotating. The connector 3 is then installed, and it is threadedly connected to the transmission output shaft 1. The pressure plate 4 may be subjected to various external forces. Without the restraint of the fastener 6, the pressure plate 4 may rotate, affecting the stability of the entire structure. When installing the connector 3, a wrench must be used to tighten it to the specified torque to ensure a secure and reliable connection between the connector 3 and the transmission output shaft 1.

[0034] Then, the locking plate 5 is press-fitted, and the locking plate 5 and the connecting piece 3 are interference-fitted to prevent axial movement. The upper part of the locking plate 5, which is the first locking plate, has the same shape as the connecting piece 3, both being regular hexagons. The two parts are circumferentially locked and cannot rotate relative to each other. The connecting piece 3 may rotate under the action of torque, but the regular hexagonal locking plate 5 can effectively prevent the connecting piece 3 from rotating, enhancing the stability of the connection.

[0035] Finally, the lower part of the locking piece 5, i.e., the second locking piece, is riveted according to the notch position on the pressure plate 4, so that the locking piece 5 is embedded in the pressure plate 4. Figure 5As shown. In this embodiment, riveting is a method of connecting two parts together by plastic deformation caused by external force. The two parts are specifically the locking plate 5 and the pressure plate 4.

[0036] The transmission output shaft 1 is splined to the flange 2, preventing circumferential rotation. The pressure plate 4 is pin-connected to the flange 2, preventing circumferential rotation. The pressure plate 4 and locking plate 5 mechanically limit circumferential rotation. The locking plate 5 also limits the shape of the connecting piece 3, preventing circumferential rotation. This locks the connecting piece 3 to the transmission output shaft 1, preventing relative rotation between the parts and achieving permanent anti-loosening. Figure 6 As shown.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

Claims

1. A transmission output shaft nut anti-loosening structure, characterized in that: Includes a flange (2) fitted on the outer surface of the transmission output shaft (1), a pressure plate (4) is provided at one end of the transmission output shaft (1), and is fixedly connected to the flange (2) by fasteners (6). A connector (3) and a locking piece (5) are provided at the end of the pressure plate (4) away from the fasteners (6), and the connector (3) is nested inside the locking piece (5).

2. The transmission output shaft nut anti-loosening structure according to claim 1, characterized in that: The pressure plate (4) is provided with a sealing element (7) at one end near the fastener (6), and the sealing element (7) is fixedly installed in the mounting groove inside the flange (2).

3. The transmission output shaft nut anti-loosening structure according to claim 2, characterized in that: The locking piece (5) includes a first locking piece and a second locking piece. The first locking piece is adapted to the connector (3), and the second locking piece is fixedly installed at one end of the first locking piece.

4. The transmission output shaft nut anti-loosening structure according to claim 3, characterized in that: The transmission output shaft (1) is splinedly connected to the flange (2).

5. The transmission output shaft nut anti-loosening structure according to claim 4, characterized in that: The flange (2) is interference-fitted with the fastener (6), and the fastener (6) is clearance-fitted with the pressure plate (4).

6. The transmission output shaft nut anti-loosening structure according to claim 5, characterized in that: The transmission output shaft (1) is threadedly connected to the connector (3).

7. The transmission output shaft nut anti-loosening structure according to claim 6, characterized in that: The locking piece (5) is embedded into the pressure plate (4) by riveting.

8. The transmission output shaft nut anti-loosening structure according to claim 7, characterized in that: The sealing element (7) is an O-ring.

9. The transmission output shaft nut anti-loosening structure according to claim 8, characterized in that: The fastener (6) is a cylindrical pin.

10. The transmission output shaft nut anti-loosening structure according to claim 9, characterized in that: The connector (3) is a nut.

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