Three-layer aluminum shell reducing mechanism

Abstract

The invention relates to the technical field of automobile steering, and discloses a three-layer aluminum shell speed reducing mechanism which comprises a worm shell, a sensor shell, a lower bearing shell and a torsion bar. One end of the worm shell is detachably connected with the bottom of the back face of the sensor shell, a through hole A is formed in the middle of the sensor shell, a through hole B is formed in the middle of the worm shell, a lower shaft is connected to the through hole B in an inserted mode, and a ball bearing A is fixedly installed at the joint of the lower shaft and the through hole B; and a ball bearing B is fixedly mounted at the joint between the lower shaft and the sensor shell. A two-layer aluminum shell on the basis of an original product is changed into a three-layer aluminum shell matched with the sensor with the torque signal, the overall strength of the speed reducing mechanism can be improved, compared with the maximum 9000 N axial force of an existing product, the improved structure can meet the 1,500 N axial force level, torque signal output is achieved, the electrical signal precision is improved, and the reliability of the speed reducing mechanism is improved. Accurate input signals of the power-assisted motor are ensured, and the failure rate is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive steering, and more particularly to a three-layer aluminum housing reduction mechanism. Background Art

[0002] As an important part of the automotive chassis components, the main function of the steering gear assembly is to convert the output torque of the intermediate shaft assembly of the steering system into the linear motion of the steering gear rack, thereby realizing the steering motion of the wheels and completing the steering operation of the vehicle. Since the strength of a person is limited, in addition to completing the transmission of motion, the steering gear also needs to reduce the steering ratio to increase the output torque of the steering gear.

[0003] The reduction mechanism of the steering gear in the prior art is a two-side aluminum housing structure. The tolerances of the various components and assemblies of the reduction mechanism cause frictional noise after contact and cannot match the Hella sensor. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a three-layer aluminum housing reduction mechanism to solve the problems existing in the above-mentioned background art.

[0005] The present invention provides the following technical solutions: A three-layer aluminum housing reduction mechanism, including,

[0006] A worm housing for assembling a worm;

[0007] A sensor housing for assembling a sensor;

[0008] A lower bearing housing for assembling a lower shaft;

[0009] A torsion bar for connecting and assembling with the steering shaft of the steering gear;

[0010] One end of the worm housing is detachably connected to the bottom of the back of the sensor housing. A through hole A is provided in the middle of the sensor housing, and a through hole B is provided in the middle of the worm housing. The through hole A and the through hole B are arranged corresponding to each other front and back. The lower bearing housing is detachably installed between the worm housing and the sensor housing. An input shaft is inserted at the through hole A, and a lower shaft is inserted at the through hole B. The front end of the lower shaft is inserted into the middle position of the lower bearing housing. The lower shaft and the input shaft are arranged corresponding to each other front and back, and are press-fitted between them. A ball bearing A is fixedly installed at the connection between the lower shaft and the through hole B, and a ball bearing B is fixedly installed at the connection between the lower shaft and the sensor housing. There is a gap between the ball bearing B and the side surface of the sensor housing.

[0011] Preferably, a sensor is installed in the middle of the sensor housing, and the sensor is sleeved on the input shaft.

[0012] Preferably, the torsion bar is inserted in the middle of the input shaft, and one end of the torsion bar penetrates through the input shaft and extends into the lower shaft, and is fixedly connected to the lower shaft through a fixing pin.

[0013] Preferably, a needle roller bearing is embedded at the connection between the input shaft and the through hole A.

[0014] Preferably, the upper and lower ends of the sensor housing are matched with the worm housing and the sensor housing, and corresponding assembly holes are provided, and bolts are threadedly connected in the assembly holes.

[0015] Preferably, an O-ring is provided at the connection between the worm housing and the sensor housing.

[0016] The technical effects and advantages of the present invention:

[0017] 1. The two-layer aluminum housing of the present invention is changed to a three-layer aluminum housing matching a sensor with a torque signal on the basis of the original product, which can improve the overall strength of the reduction mechanism. Compared with the maximum 9000N axial force of the existing product, this structure can meet the 11500N axial force level, and has a torque signal output, improving the electrical signal accuracy, ensuring the accuracy of the input signal of the assist motor, and reducing the failure rate.

[0018] 2. The bearing of the present invention does not contact the side of the lower shaft housing, and a gap is reserved, reducing the influence of tolerances of various components and assemblies, and greatly reducing the friction noise generated after the contact of various components. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the present invention.

[0020] The reference numerals are: 110, worm housing; 120, lower shaft; 130, fixing pin; 140, ball bearing A; 150, ball bearing B; 160, lower shaft housing; 170, bolt; 180, sensor housing; 190, needle roller bearing; 200, input shaft; 210, torsion bar; 220, sensor; 230, O-ring. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, the technical solutions in the present invention will be clearly and completely described in conjunction with the drawings in the present invention. In addition, the forms of each structure described in the following embodiments are merely examples, and the textile oven related to the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0022] The present invention provides a three-layer aluminum housing reduction mechanism, as Figure 1 shown, including,

[0023] Worm housing 110, for assembling a worm;

[0024] Sensor housing 180, for assembling a sensor;

[0025] Lower bearing housing 160, for assembling a lower shaft;

[0026] Torsion bar 210, for connecting and assembling with the steering shaft of a steering gear;

[0027] One end of the worm housing 110 is detachably connected to the bottom of the back surface of the sensor housing 180. Through holes A are provided in the middle of the sensor housing 180, and through holes B are provided in the middle of the worm housing 110. The through holes A and B are arranged corresponding to each other front and back. The lower bearing housing 160 is detachably installed between the worm housing 110 and the sensor housing 180. An input shaft 200 is inserted at the through hole A, and a lower shaft 210 is inserted at the through hole B. The front end of the lower shaft 120 is inserted into the middle position of the lower bearing housing 160. The lower shaft 120 and the input shaft 200 are corresponding front and back, and are press-fitted between them. A ball bearing A 140 is fixedly installed at the connection between the lower shaft 210 and the through hole B. A ball bearing B 150 is fixedly installed at the connection between the lower shaft and the sensor housing 160. And there is a gap between the ball bearing B 150 and the side surface of the sensor housing 160. The bearing 150 does not contact the side surface of the lower shaft housing, and a gap is reserved to reduce the influence of tolerances of various components and assemblies, and greatly reduce the friction abnormal noise generated after the contact of each component.

[0028] A sensor 220 is installed in the middle of the sensor housing 180, and the sensor 220 is sleeved on the input shaft 200.

[0029] The torsion bar 210 is inserted into the middle of the input shaft 200, and one end of the torsion bar 210 penetrates through the input shaft 200 and extends into the lower shaft 120, and is fixedly connected to the lower shaft 120 through a fixing pin 130.

[0030] A needle roller bearing 190 is embedded at the connection between the input shaft 200 and the through hole A. The needle roller bearing 190 ensures the coaxiality of the inner shaft in the column tube and improves the feel of the steering wheel.

[0031] The upper and lower ends of the sensor housing 160 match the worm housing 110 and the sensor housing 180, and corresponding assembly holes are provided, and bolts 170 are threadedly connected in the assembly holes. The bolts 170 are hexagon flange bolts for fixing the worm housing 110, the lower shaft housing 160, and the sensor housing 180.

[0032] An O-ring 230 is provided at the connection between the worm housing 110 and the sensor housing 160. The O-ring 230 is not only used to seal the connection between the worm housing 110 and the sensor housing 160, but also seals the worm and worm gear grease.

[0033] Working principle of the present invention: The input shaft 200 receives torque and transmits the torque to the lower shaft 120. Among them, the ball bearing A 140 and the ball bearing B 150 both support and limit different positions of the lower shaft 120. The worm housing 110 supports and limits the ball bearing A 140, and the lower shaft housing 160 supports and limits the ball bearing B 150. The needle bearing 190 supports the input shaft 200, and the sensor housing 180 supports the needle bearing 190.

[0034] Finally, several points should be noted: First, in the description of the present application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. It can be a mechanical connection or an electrical connection, or it can be the communication inside two components. It can be directly connected. "Upper", "lower", "left", "right", etc. are only used to represent the relative position relationship. When the absolute position of the object being described changes, the relative position relationship may change;

[0035] Second: In the attached drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. For other structures, reference can be made to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0036] Finally: The above description is only the preferred embodiment of the present invention and is not used to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Three-layer aluminum housing speed reduction mechanism, including: A worm housing (110) for assembling the worm; A sensor housing (180) for assembling the sensor; A lower bearing housing (160) for assembling the lower shaft; A torsion bar (210) is used for being connected and assembled with a steering shaft of a steering gear; Features: One end of the worm housing (110) is detachably connected to the bottom of the back side of the sensor housing (180); a through hole A is provided in the middle of the sensor housing (180); a through hole B is provided in the middle of the worm housing (110); the through hole A and the through hole B are arranged in front and back correspondence; the lower bearing housing (160) is detachably installed between the worm housing (110) and the sensor housing (180); an input shaft (200) is inserted into the through hole A; and a lower bearing housing (200) is inserted into the through hole B. The lower shaft (210) is connected to the sensor housing (160), and the front end of the lower shaft (120) is inserted into the middle position of the lower bearing housing (160). The lower shaft (120) corresponds to the input shaft (200) front and back, and they are inserted in an interference fit. A ball bearing A (140) is fixedly installed at the connection between the lower shaft (210) and the through hole B. A ball bearing B (150) is fixedly installed at the connection between the lower shaft and the sensor housing (160), and a gap is spaced between the ball bearing B (150) and the side of the sensor housing (160).

2. The three-layer aluminum shell speed reduction mechanism according to claim 1 is characterized in that: A sensor (220) is installed in the middle of the sensor housing (180), and the sensor (220) is sleeved on the input shaft (200).

3. The three-layer aluminum shell speed reduction mechanism according to claim 1 is characterized in that: The torsion bar (210) is inserted into the middle of the input shaft (200), and one end of the torsion bar (210) passes through the input shaft (200) and extends to the inside of the lower shaft (120), and is fixedly connected to the lower shaft (120) via a fixing pin (130).

4. The three-layer aluminum shell speed reduction mechanism according to claim 1 is characterized in that: A needle roller bearing (190) is embedded and installed at the connection between the input shaft (200) and the through hole A.

5. The three-layer aluminum shell speed reduction mechanism according to claim 1 is characterized in that: The upper and lower ends of the sensor housing (160) match the worm housing (110) and the sensor housing (180), and are both provided with corresponding assembly holes, and the assembly holes are both threadedly connected with bolts (170).

6. The three-layer aluminum shell speed reduction mechanism according to claim 1 is characterized in that: An O-ring (230) is provided at the connection between the worm housing (110) and the sensor housing (160).

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