CN211364697U

CN211364697U - Improved connecting structure of extension shaft and input shaft

Info

Publication number: CN211364697U
Application number: CN201921551432.6U
Authority: CN
Inventors: 季娟; 戴培军; 沈雨春
Original assignee: Bosch Huayu Steering Systems Co Ltd
Current assignee: Bosch Huayu Steering Systems Co Ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-08-28
Anticipated expiration: 2029-09-18

Abstract

The utility model relates to the technical field of steering system assembly production, in particular to an improved connecting structure of an extension shaft and an input shaft, wherein the inner wall of the lower end of the extension shaft is provided with an internal spline; the outer wall of input shaft upper end has whole circle external splines, and the input shaft upper end inserts the mode that the extension shaft lower extreme utilized internal and external splines to mesh and connects, and the mode that extension shaft and input shaft junction utilized the circular arc to rivet is pressed there is the concave yield riveting point, and the outside cover of input shaft is equipped with the dust cover, and the top of dust cover and the outside interference fit of extension shaft lower extreme establish including the interface cover of extension shaft and input shaft junction, the utility model discloses an extension shaft has cancelled side screw thread through-hole, and the crescent moon groove has been cancelled in the top outside of input shaft, has cancelled lock nut's use in fixed Assembly to reduce part manufacturing cost and assembly cost, lengthened the height of dust cover simultaneously, make extension shaft and input shaft junction have the sealing performance of preferred, prevent that spline department from being rusted and corroded, thereby guaranteed good steering performance.

Description

Improved connecting structure of extension shaft and input shaft

Technical Field

The utility model relates to a steering system assembly production technical field, specific saying is a modified extension shaft and input shaft's connection structure.

Background

In the design of an automobile steering machine, a steering wheel is connected with an upper tubular column and an intermediate shaft, the intermediate shaft is connected with an input shaft on the steering machine, an upper transverse pull rod of the steering machine is connected with a tire, when a driver applies a certain rotating torque to the steering wheel, the torque can be transmitted to the intermediate shaft through the tubular column and then transmitted to the input shaft through a lower pitch fork on the intermediate shaft, and the steering machine converts the torque of the input shaft into the push-pull force of the transverse pull rod so as to realize the control of the tire.

Under the conventional arrangement of the whole vehicle, an upper yoke is generally close to a steering engine, the length of a required input shaft is moderate, but the positions of cabs of some SUV vehicle types are higher, so that the upper yoke is far away from the lower steering engine, the required input shaft is longer, and an extension shaft is additionally designed to connect the upper yoke and the input shaft because the production assembly line of the steering engine has upper limit on the total length of the input shaft.

The bottom feature of the extension shaft in the existing design is similar to that of the lower yoke, and referring to fig. 3, the side surface of the extension shaft is two parallel planes, and threaded through holes are drilled on the planes, so that the structure is difficult to manufacture and high in cost.

Referring to fig. 5, the top of the existing input shaft is of a parallel-tooth spline structure with a crescent groove feature, and the parallel-tooth spline is generally formed by a milling process, so that the processing cost is high.

Referring to fig. 1, after the existing extension shaft and the input shaft are connected through a spline, a locking bolt needs to be screwed into a threaded through hole of the extension shaft and a crescent groove of the input shaft, so that the extension shaft and the input shaft cannot generate relative displacement in the axial direction.

The dust cover only covers the input shaft, so that liquid, dust and the like can be prevented from entering the steering gear from the sensor cover, and the sealing performance of the connection part of the extension shaft and the input shaft cannot be guaranteed. According to experience, over time, the area can rust and corrode, the steering performance is affected, and meanwhile, the noise risk exists.

Therefore, the design of the connection structure of the extension shaft and the input shaft, which can reduce the cost and is easy to assemble on the premise of ensuring the tight connection of the extension shaft and the input shaft, is necessary.

Disclosure of Invention

The utility model discloses broken through prior art's a difficult problem, designed one kind and guaranteeing under extension axle and input shaft zonulae occludens's the prerequisite, the connection structure of extension axle and input shaft that can reduce cost, simple assembly.

In order to achieve the above object, the utility model discloses a connection structure of modified extension axle and input shaft, including extension axle, input shaft, dust cover, its characterized in that: the inner wall of the lower end of the extension shaft is provided with an internal spline; the outer wall of the upper end of the input shaft is provided with a whole circle of external splines, the upper end of the input shaft is inserted into the lower end of the extension shaft and is connected in a manner of meshing the internal splines and the external splines, concave riveting points are pressed at the connection positions of the extension shaft and the input shaft in a manner of arc riveting, a dust cover is covered outside the input shaft, the top of the dust cover is in interference fit with the outside of the lower end of the extension shaft, and an interface cover at the connection positions of the extension shaft and the input shaft is arranged inside.

The number of the concave riveting points is 2, and the concave riveting points are arranged at intervals of 180 degrees.

The depth of the concave riveting point is 0.3-0.9 mm.

Compared with the prior art, the utility model discloses an extension shaft has cancelled side screw thread through-hole, and the crescent moon groove has been cancelled in the top outside of input shaft, has cancelled lock nut's use in fixed Assembly to reduce part manufacturing cost and assembly cost, lengthened the height of dust cover simultaneously, make extension shaft and input shaft junction have the sealing performance of preferred, prevent that spline department from corroding and rustting, thereby guaranteed good steering performance.

Drawings

Fig. 1 is a sectional view of a prior art coupling structure.

Fig. 2 is a cross-sectional view of the connection structure of the present invention.

Fig. 3 is a perspective view of the lower end of an extension shaft of the prior art.

Fig. 4 is a perspective view of the lower end of the extension shaft of the present invention.

Fig. 5 is a perspective view of the upper end of a prior art input shaft.

Fig. 6 is a perspective view of the upper end of the input shaft of the present invention.

Fig. 7 is a partial schematic view of the riveting position of the concave riveting point of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

Referring to fig. 2 and 7, the present invention provides an improved connection structure of an extension shaft and an input shaft, including an extension shaft, an input shaft, and a dust cover, wherein the inner wall of the lower end of the extension shaft 1 is provided with an internal spline 2; the outer wall of the upper end of the input shaft 3 is provided with a whole circle of external splines 4, the upper end of the input shaft 3 is inserted into the lower end of the extension shaft 1 and is connected by an internal spline and an external spline in a meshing mode, the circumferential direction of the input shaft and the peripheral direction of the input shaft are ensured to be relatively fixed, concave riveting points 5 are pressed at the joint of the extension shaft 1 and the input shaft 3 by an arc riveting mode, the interval between the two concave riveting points 5 is 180 degrees, the axial direction of the extension shaft and the input shaft is ensured to be relatively fixed, when the input shaft and the input shaft are pressed, 7-12KN external force is applied to the riveting position by a riveting head, the feeding distance of the riveting head is 0.3-0.9mm, the influence on the splines is reduced to the maximum extent, the outer part of the input shaft 3 is covered with a dust cover 6, the top of the dust cover 6 is in interference fit with the outer part of the lower end of the extension shaft 1, an interface at the joint, the spline is prevented from being corroded and rusted, so that good steering performance is guaranteed.

Referring to fig. 4, the utility model discloses an extension axle 1 has cancelled side screw thread through-hole, and the bottom inboard is the all-round spline, simple structure, and it is convenient to make, and the cost is lower, and shared space is less after connecting with the input shaft, arranges friendly to the whole car.

Referring to fig. 6, the utility model discloses an input shaft top outside is the complete circumferential spline, has cancelled the design of crescent groove, owing to be the complete tooth structure, generally adopts the shaping of file tooth technology, and need not reprocess the crescent groove, therefore the processing cost obviously reduces, and the assembly also becomes very simple moreover.

Claims

1. The utility model provides a modified extension shaft and input shaft's connection structure, includes extension shaft, input shaft, dust cover, its characterized in that: the inner wall of the lower end of the extension shaft (1) is provided with an internal spline (2); input shaft (3) upper end outer wall have whole circle external splines (4), input shaft (3) upper end is inserted extension shaft (1) lower extreme and is utilized the mode of internal and external splines meshing to connect, extension shaft (1) and input shaft (3) junction utilize the circular arc to rivet the mode pressure to have concave yield riveting point (5), input shaft (3) outside cover is equipped with dust cover (6), the outside interference fit of the top of dust cover (6) and extension shaft (1) lower extreme, with extension shaft (1) and input shaft (3) junction's interface cover establish including.

2. An improved connecting structure of an extension shaft and an input shaft according to claim 1, wherein: the number of the concave riveting points (5) is 2, and the positions are spaced by 180 degrees.

3. An improved connecting structure of an extension shaft and an input shaft according to claim 1, wherein: the concave depth of the concave riveting point (5) is 0.3-0.9 mm.