Rectangular spline transmission limiting structure

Abstract

The utility model relates to a limiting structure for rectangular spline transmission. The limiting structure solves the problem that axial limiting of a swing arm often fails during rectangular spline transmission. Comprising a shaft (1) with an outer rectangular spline, a swing arm (2) with an inner rectangular spline, a check ring (3), a locking gasket (4) and a locking nut (5), a shaft shoulder (B2) is machined at the joint of a threaded section and an outer rectangular spline section of the shaft (1), a shaft shoulder (B1) is machined at the joint of the other end of the outer rectangular spline section and an optical axis section, and the swing arm (2) is arranged behind the spline part of the shaft (1). A gap a is reserved between the end face of the swing arm (2) and the end face of the shaft shoulder (B2), and the check ring (3) and the locking gasket (4) are tightly pressed on the end face of the shaft shoulder (B2) of the shaft (1) through the locking nut (5). After the locking device is implemented, the locking nut can be ensured not to be loosened, the problem of transmission failure of the swing arm caused by the loosening of the locking nut is ensured not to occur, and the driving safety of a vehicle is ensured.

Description

Technical Field

[0001] This utility model relates to a limiting structure, specifically a limiting structure for a rectangular spline transmission. Background Technology

[0002] Currently, in heavy-duty truck steering systems, when a swing arm with rectangular splines is used for transmission, the axial limiting of the swing arm is typically achieved by using locking washers and locking nuts to press the swing arm with rectangular splines against the shoulder end face of the rotating shaft with external rectangular splines. Theoretically, this structure allows the swing arm to transmit torque to the rotating shaft through the splines and ensures the relative stillness of the swing arm, rotating shaft, locking washers, and locking nuts. However, in reality, this multi-tooth spline fit is a clearance fit. When transmitting torque, it mainly relies on the clamping force of the locking nut for transmission. After prolonged reciprocating motion, the locking washers may break, causing the axial limiting of the swing arm to fail. Utility Model Content

[0003] This invention solves the problem of frequent failure of the axial limit of the swing arm in rectangular spline transmission by providing a limiting structure.

[0004] This utility model is achieved through the following technical solution:

[0005] A limiting structure for a rectangular spline drive includes a shaft (1) with an outer rectangular spline, a rocker arm (2) with an inner rectangular spline, a retaining ring (3), a locking washer (4), and a locking nut (5). A second shoulder (B2) is machined at the junction of the threaded section and the outer rectangular spline section of the shaft (1), and a first shoulder (B1) is machined at the junction of the other end of the rectangular spline section and the smooth shaft section. After the rocker arm (2) is mounted on the spline part of the shaft (1), a gap a is left between the end face of the rocker arm (2) and the end face of the second shoulder (B2). The locking nut (5) presses the retaining ring (3) and the locking washer (4) onto the end face of the second shoulder (B2) of the shaft (1).

[0006] After the implementation of this utility model, it can be guaranteed that the locking nut will not loosen, and the swing arm will not experience transmission failure due to the loosening of the locking nut, thus ensuring the driving safety of the vehicle. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0008] See Figure 1This utility model consists of a shaft (1) with an outer rectangular spline, a rocker arm (2) with an inner rectangular spline, a retaining ring (3), a locking washer (4), and a locking nut (5). The shaft (1) has a first shoulder (B1) and a second shoulder (B2) machined on it. The retaining ring (3) is made of heat-treated steel. After the rocker arm (2) is mounted on the splined part of the shaft (1), the locking nut (5) presses the retaining ring (3) and the locking washer (4) against the end face of the second shoulder (B2) of the shaft (1). While ensuring that the suitable axial clearance a of the rocker arm (2) is greater than 0, the rocker arm (2) can move freely axially between the end faces of the first shoulder (B1) and the second shoulder (B2) on the shaft (1).

[0009] The working principle of this utility model is as follows: When the swing arm (2) rotates, if the swing arm (2) and the retaining ring (3) are squeezed and rubbed, since the retaining ring (3) and the swing arm (2) are both heat-treated steel parts with a very small coefficient of friction, the friction torque generated by them can be ignored relative to the tightening torque of the locking nut, and the relative friction angle is only the angle generated by eliminating the fit gap between the rectangular splines. In this way, it can be ensured that the locking nut (5) will not loosen during the rectangular spline transmission process, thus ensuring reliable spline transmission.

[0010] This invention adds a retaining ring (3) between the locking washer (4) and the swing arm (2), and a second shoulder (B2) is machined on the shaft (1). After all parts are assembled, the swing arm (2) has a suitable axial clearance a, which ensures that the swing arm (2) can move freely on the shaft (1) along the axial direction between the end faces of the first shoulder (B1) and the second shoulder (B2).

Claims

1. A limiting structure for a rectangular spline drive, characterized in that: The shaft (1) includes an outer rectangular spline, a rocker arm (2) with an inner rectangular spline, a retaining ring (3), a locking washer (4), and a locking nut (5). A second shoulder (B2) is machined at the junction of the threaded section and the outer rectangular spline section of the shaft (1). A first shoulder (B1) is machined at the junction of the other end of the rectangular spline section and the smooth shaft section. After the rocker arm (2) is installed on the spline part of the shaft (1), a gap a is left between the end face of the rocker arm (2) and the end face of the second shoulder (B2). The locking nut (5) presses the retaining ring (3) and the locking washer (4) onto the end face of the second shoulder (B2) of the shaft (1).

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