CN213206371U

CN213206371U - High-torque steel ball type intermediate shaft

Info

Publication number: CN213206371U
Application number: CN202021359884.7U
Authority: CN
Inventors: 冯兴辉; 姜卓; 董行; 张方胜; 刘文凯; 梁旭; 郗宁; 徐建国; 唐少波; 黄智勇
Original assignee: Bosch Huayu Steering Systems Co Ltd
Current assignee: Bosch Huayu Steering Systems Co Ltd
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2021-05-14
Anticipated expiration: 2030-07-13

Abstract

The utility model belongs to the technical field of the auto steering system technique and specifically relates to a high moment of torsion steel ball formula jackshaft, including sliding vice, the festival fork, the cross axle, the swing festival fork, a festival fork is installed respectively at the vice both ends of sliding, the festival fork is connected with the both ends of controlling of cross axle, the upper and lower both ends and the swing festival fork of cross axle are connected, it is vice including the slip pipe to slide, the slip axle, the holder, the steel ball, the anticreep cap, the slip axle sets up in the slip pipe, the holder is fixed on the slip axle, the steel ball is placed in the three rows of ball inslot on holder surface, the steel ball is connected with the internal surface roll of slip pipe, the tip of slip pipe is equipped with the anticreep cap, the tip of. Compared with the prior art, the utility model, designed the cooperation structure of bearing and cross, the optimization structure of swing festival fork cooperates three formula steel ball structures simultaneously, has not only simplified the assembly, has reduced the processing cost, has more guaranteed the moment of torsion range of application and the stability of product.

Description

High-torque steel ball type intermediate shaft

Technical Field

The utility model belongs to the technical field of the car a steering system technique and specifically relates to a high moment of torsion steel ball formula jackshaft.

Background

The steering intermediate shaft is an important part in an automobile steering system and is used for connecting a steering column with a steering machine and transmitting torque and rotating speed from the steering column to the steering machine. The steering intermediate shaft is used as a last step part for the final assembly and assembly of the steering system and has the function of easy extension and retraction.

With the continuous development of the automobile industry, the requirements of the whole vehicle on an electric power steering system are gradually increased, and the output torque provided by the system is continuously increased, so that higher requirements are placed on the torque which can be borne by the intermediate connecting component intermediate shaft for transmitting the torque.

According to the investigation and analysis of the existing products on the market at present, the result shows that the spline type coating or injection coating is a structure which is difficult to meet the requirement of high torque. The steel ball type intermediate shaft structure has obvious advantages in the application of high torque. The steel ball type structures on the market at present have many differences, but some structures have too high processing cost and some structures have too complex structures, so that the complexity of assembly is increased.

Therefore, a high-torque steel ball type intermediate shaft needs to be designed, so that the torque application range is ensured, the assembly is simplified, and the processing cost is reduced.

Disclosure of Invention

The utility model aims at overcoming the not enough of prior art, providing a high moment of torsion steel ball formula jackshaft, when guaranteeing the moment of torsion range of application, simplifying the assembly, reduce the processing cost.

In order to achieve the aim, the utility model relates to a high moment of torsion steel ball formula jackshaft, including sliding pair, the festival fork, the cross axle, the swing festival fork, a festival fork is installed respectively at the vice both ends of sliding, the festival fork is connected with the both ends of controlling of cross axle, the upper and lower both ends and the swing festival fork of cross axle are connected, sliding pair is including the slip pipe, the slip shaft, the holder, the steel ball, the anticreep cap, the slip shaft sets up in the slip pipe, the holder is fixed on the slip shaft, the steel ball is placed in the three rows of ball grooves on holder surface, the steel ball is connected with the internal surface roll of slip pipe, the tip of slip pipe is equipped with the anticreep cap, the tip of slip shaft passes the anticree.

The universal joint is characterized in that the joint yoke is connected with the cross shaft, and the cross shaft is connected with the swinging joint yoke by a needle bearing.

The inner envelope of the needle bearing is 9.995-10.005 mm, and the outer diameter of the cross shaft is 10.020-10.030 mm.

The sliding shaft is provided with an oil storage tank.

A sealing ring is arranged between the sliding tube and the anti-falling cap, and a sealing plug is arranged at the other end of the sliding tube.

The inner diameter of a joint fork ear hole of the swing joint fork is 16.014H 7(0 +0.018), the outer envelope is phi 32mm, the thickness of a joint fork arm is 42mm, and the wall thickness of the ear hole is 8.5 mm.

Compared with the prior art, the utility model, designed the cooperation structure of bearing and cross, the optimization structure of swing festival fork cooperates three formula steel ball structures simultaneously, has not only simplified the assembly, has reduced the processing cost, has more guaranteed the moment of torsion range of application and the stability of product.

Drawings

Fig. 1 is an axonometric view of the present invention.

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

Fig. 3 is an exploded view of the present invention.

Fig. 4 is an axonometric view of the sliding shaft of the present invention.

Fig. 5 is a sectional view of the sliding pair of the present invention.

Fig. 6 is a detailed view of the ball groove position of the present invention.

Fig. 7 is a detailed view of the ball groove position of the present invention.

Fig. 8 is a detailed view three of the position of the ball groove of the present invention.

Fig. 9 is a fourth detailed view of the ball groove position of the present invention.

Fig. 10 is an isometric view of the swing yoke of the present invention.

Fig. 11 is a schematic view of the cross shaft and needle bearing of the present invention.

Detailed Description

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

Referring to fig. 1-3, the utility model relates to a high moment of torsion steel ball formula jackshaft, including slip pair, pitch fork, cross, swing pitch fork, a pitch fork 1 is installed respectively at the vice both ends of slip, and both ends are connected about pitch fork 1 and cross 2, and the upper and lower both ends and the swing pitch fork 3 of cross 2 are connected.

Referring to fig. 5, the sliding pair comprises a sliding tube 5, a sliding shaft 6, a retainer 7, steel balls 8 and an anti-drop cap 9, wherein the sliding shaft 6 is arranged in the sliding tube 5, the retainer 7 is fixed on the sliding shaft 6, the steel balls 8 are placed in three rows of ball grooves on the surface of the retainer 7, and each row of ball grooves is provided with ten steel balls 8. The steel ball 8 is in rolling connection with the inner surface of the sliding tube 5. The three-row steel ball structure has better stability, the whole stroke is rolling friction, and the sliding force performance is also better. The end of the sliding tube 5 is provided with a separation-preventing cap 9, and the end of the sliding shaft 6 passes through the separation-preventing cap 9.

Referring to fig. 6-9, the design of the sliding pair part is based on the following specific principles: first, an axial load Q at a ball groove contact position is converted from a torque T of a platform development target, wherein Q = cos α T/r. The contact deformation amount and the maximum contact stress at the ball groove position are checked according to the selected steel ball diameter X and the radius X1, X2, X3 and X4 of each segment of the ball groove position. ρ = 1/X; ρ 1= ρ 3=1/X1= 1/X3; ρ 4= ρ 6=1/X4= 1/X6; since the radius of the outer ring of the linear rolling bearing can be regarded as ∞, ρ e =0, the contact form of the steel ball and the position of the ball groove after torque application is an ellipse, the length of the major and minor semiaxis of the ellipse is a and b respectively, and the calculation formula is b-a =1/2| (ρ)₁+ρ₂)|；b+a=1/2|(ρ₁+ρ₂)|；F(ρ)=b-a/b+a。

Calculated by the numerical calculation program MATLAB program: a, b, delta^*；∑ρ=2(a+b)；1/E´=2((1-ν²)/E)。

The maximum contact stress is thus obtained: p₀=3Q/2πab。

Calculated from the fitting formula of Hamrock and Dowson: k =1.0339 (X/X)₁)^0.6360；e=(1-1/k2)^1/2；K(e)=1.5277+0.6023ln(X/X₁)^0.6360；E(e)=1.0003+0.5968(X/X₁)。

By the formula: a = a^*(3Q/2∑ρE´)^1/3；B= b^*(3Q/2∑ρE´)^1/3；δ=δ^*(3Q/2∑ρE´)^2/3∑ρ/2。

Above be the theoretical calculation mode of contact stress and deflection, check the calculation through inside CAE simultaneously, the result shows and coincide basically with theoretical calculation result, the utility model discloses can realize higher rigidity requirement and bigger moment of torsion scope. Therefore, according to the theoretical calculation and the CAE analysis result, the position of the ball groove is determined.

The utility model discloses when selecting the steel ball size, use the steel ball standard measuring block less than the nominal value, measure the clearance of vice position of slip through measuring equipment, select through the apolegamy of clearance numerical value and formulation, reselect suitable steel ball, measured cost and complexity when having saved the part assembly.

Referring to fig. 11, the yoke 1 and the cross shaft 2, the cross shaft 2 and the swing yoke 3 are connected by the needle roller bearing 4, the inner envelope of the needle roller bearing 4 is 9.995-10.005 mm, the outer diameter of the cross shaft 2 is 10.020-10.030 mm, and the matching of the needle roller bearing 4 and the cross shaft 2 improves the torque application range of the assembly product.

Because central siphon part machining precision is higher, in order to avoid the part pollution influence cooperation, has designed the sealing member to the assembly part simultaneously, is equipped with sealing washer 10 between sliding tube 5 and the anticreep cap 9, and another tip of sliding tube 5 is equipped with sealing plug 11.

Refer to fig. 4, because in the whole car operation process, the utility model discloses not only will bear radial high load moment of torsion, still have the axial small sliding simultaneously, for fretting wear and the effective suppression noise that produces of solving this in-process, at 6 surperficial steel ball cooperation departments of sliding shaft, scribble the special grease that resists fretting wear, be equipped with the oil storage tank on the sliding shaft 6, the oil storage tank can be better in the grease of durable in-process release needs, the sealing member also can prevent spilling over of grease simultaneously, the oil storage tank has greatly improved to the lubrication and the noise meter of sliding pair.

Referring to fig. 10, the inner diameter of the yoke ear hole of the swing yoke 3 is 16.014H 7(0 +0.018), the outer envelope is phi 32mm, the thickness of the yoke arm is 42mm, and the wall thickness of the ear hole is 8.5mm, so that the bearable torque of the swing yoke 3 is improved, and the design robustness of the assembly product is enhanced.

The utility model discloses a cooperation structure of bearing and cross, the optimization structure of swing festival fork cooperate three formula steel ball structures simultaneously, have not only simplified the assembly, have reduced the processing cost, have more guaranteed the moment of torsion range of application and the stability of product.

Claims

1. The utility model provides a high moment of torsion steel ball formula jackshaft, includes slip pair, pitch fork, cross, swing pitch fork, its characterized in that: a section fork (1) is installed respectively at the both ends of sliding pair, section fork (1) is connected with the left and right sides both ends of cross axle (2), the upper and lower both ends of cross axle (2) are connected with swing section fork (3), sliding pair includes sliding tube (5), sliding shaft (6), holder (7), steel ball (8), anticreep cap (9), sliding shaft (6) set up in sliding tube (5), holder (7) are fixed on sliding shaft (6), steel ball (8) are placed in the three rows of ball grooves on holder (7) surface, steel ball (8) and the internal surface roll connection of sliding tube (5), the tip of sliding tube (5) is equipped with anticreep cap (9), the tip of sliding shaft (6) passes anticreep cap (9).

2. A high torque steel ball type intermediate shaft according to claim 1, wherein: the joint yoke (1) is connected with the cross shaft (2), and the cross shaft (2) is connected with the swing joint yoke (3) through a needle bearing (4).

3. A high torque steel ball type intermediate shaft according to claim 2, wherein: the inner envelope of the needle roller bearing (4) is 9.995-10.005 mm, and the outer diameter of the cross shaft (2) is 10.020-10.030 mm.

4. A high torque steel ball type intermediate shaft according to claim 1, wherein: an oil storage tank is arranged on the sliding shaft (6).

5. A high torque steel ball type intermediate shaft according to claim 1, wherein: a sealing ring (10) is arranged between the sliding tube (5) and the anti-falling cap (9), and a sealing plug (11) is arranged at the other end of the sliding tube (5).

6. A high torque steel ball type intermediate shaft according to claim 1, wherein: the inner diameter of a joint fork ear hole of the swing joint fork (3) is 16.014H 7(0 +0.018), the outer envelope is phi 32mm, the thickness of a joint fork arm is 42mm, and the wall thickness of the ear hole is 8.5 mm.