Linear electric telescopic device of automobile steering wheel

Abstract

The utility model discloses an automobile steering wheel linear electric telescopic device, which comprises a motor main body, a reduction gear box and a screw rod, the reduction gear box comprises a box body, a left-hand worm gear and a right-hand worm gear, the left-hand worm gear and the right-hand worm gear are arranged in the box body side by side, the center of the left-hand worm gear is provided with a left-hand thread, and the center of the right-hand worm gear is provided with a right-hand thread. A right-hand thread is arranged in the center of the right-hand worm gear, the lead screws comprise the left-hand lead screw and the right-hand lead screw, the left-hand lead screw is screwed into the left-hand worm gear, the right-hand lead screw is screwed into the right-hand worm gear, the output end of the motor body is connected with the worm shaft, and the worm shaft extends into the box body from the side portion of the box body. And the outer teeth are meshed with the outer teeth of the left-handed worm gear and the right-handed worm gear. The horizontal moving mechanism is compact in structure and low in cost, and objects connected with the left lead screw and the right lead screw can be controlled to horizontally move in the opposite direction and the back-to-back direction through one motor.

Description

Technical Field

[0001] The utility model relates to the field of electric adjustment, in particular to a linear electric telescopic device for an automobile steering wheel. Background Art

[0002] The extension and retraction of the car steering wheel is achieved by using an electric motor as the power source, increasing the torque through a reduction device and converting the rotational motion into linear motion to drive the steering wheel to achieve linear extension and retraction motion. The position of the steering wheel is electrically adjusted to achieve a comfortable experience for the user.

[0003] At present, in the automotive field, especially in the field of electric adjustment of automotive steering wheels, the commonly used driving device uses an electric motor as a power source and in order to obtain a suitable linear output speed, in practical applications, the motor needs to be decelerated. The commonly used method at present is to connect the motor as a power source directly to the reducer to achieve deceleration, and set a first-level worm helical gear or worm gear reduction and a screw nut device in the reducer to complete the linear output speed of the steering wheel with a certain speed ratio. Currently, a single motor drives a worm gear, and the center of the worm gear has a thread that cooperates with a single screw, thereby controlling the linear expansion and contraction of the entire steering wheel. Although this driving structure can realize the linear expansion and contraction of the automotive steering wheel, since the output only has one screw linearly driving the steering wheel, the linear output speed of the steering wheel is slow, the driving time is long, and the user experience is poor. Therefore, how to design a fast driving speed and low cost automotive linear expansion and contraction device is a technical problem that needs to be solved at present. Utility Model Content

[0004] The utility model aims to provide a linear electric telescopic device for a car steering wheel, so as to overcome the problems of slow output speed, long driving time and the like existing in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a linear electric telescopic device for a car steering wheel, comprising a motor body, a reduction gear box and a screw, the reduction gear box comprising a box body, a left-handed worm wheel and a right-handed worm wheel, the left-handed worm wheel and the right-handed worm wheel are installed side by side inside the box body, the center of the left-handed worm wheel is provided with a left-handed thread, and the center of the right-handed worm wheel is provided with a right-handed thread, the screw comprises a left-handed screw rod and a right-handed screw rod, the left-handed screw rod is screwed into the left-handed worm wheel, and the right-handed screw rod is screwed into the right-handed worm wheel, the output end of the motor body is connected to the worm shaft, the worm shaft extends into the box body from the side of the box body, and meshes with the external teeth of the left-handed worm wheel and the right-handed worm wheel.

[0006] Furthermore, the housing of the reduction gearbox includes a lower shell and an upper cover, and the lower shell is provided with two parallel positioning holes for installing a left-handed worm gear and a right-handed worm gear. At the same time, a worm hole for installing a worm shaft is provided at the side end of the lower shell, and the worm and the hole positioning hole are perpendicular to each other in the axial direction.

[0007] Furthermore, the stepped shafts of the left-handed worm gear and the right-handed worm gear are respectively provided with metal flat washers and wave springs.

[0008] Furthermore, the two positioning holes on the upper cover respectively pass through the stepped shafts of the left-handed worm gear and the right-handed worm gear and are then fastened to the lower shell with screws.

[0009] Furthermore, the ends of the left-hand screw and the right-hand screw are respectively connected by interference riveting, and the other end of the friction retaining ring is inserted into the gap screw and fixed by interference riveting with a positioning ring.

[0010] Furthermore, the motor body and the lower shell are assembled and fixed with screws.

[0011] The beneficial effects of the utility model are as follows:

[0012] (1) This device can control the horizontal movement of an object connected to two left and right screw rods through a single motor, which is faster and more efficient than the conventional single motor on the market that can only control the horizontal movement of an object connected to a single screw rod.

[0013] (2) The device has a compact structure, low cost and low operating noise.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the appearance diagram of the product of the utility model;

[0016] Figure 2 It is an exploded view of the product of the utility model;

[0017] Figure 3 This is a structural diagram of the reduction gearbox of the utility model;

[0018] Figure 4 It is a cross-sectional view of the reduction gear box of the utility model;

[0019] Figure 5 This is a structural diagram of the reduction gear box of the utility model;

[0020] Figure 6 It is a structural diagram of the worm gear of the present utility model.

[0021] Markings in the figure are: 1-motor body, 2-screw, 3-worm shaft, 4-lower shell, 5-upper cover, 6-left-handed worm gear, 7-right-handed worm gear 7, 8-left-handed lead screw, 9-right-handed lead screw, 10-connector, 11-metal flat washer, 12-wave spring, 13-locating ring, 14-friction retaining ring, 15-locating hole, 16-step shaft. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figures 1 to 6 As shown, a linear electric telescopic device for a car steering wheel is mainly composed of a motor body 1, a reduction gearbox and a screw. The reduction gearbox is mainly composed of a lower shell 4, an upper cover 5, a left-handed worm gear 6, a right-handed worm gear 7, a wave spring 12, a metal flat washer 11, a positioning ring 13, a friction retaining ring 14, etc. The screw includes a left-handed screw 8 and a right-handed screw 9.

[0024] The connection method of the parts in the reduction gearbox is as follows: the left-handed and right-handed worm wheels are respectively installed in the corresponding holes of the lower shell 4 and can rotate around themselves. The stepped shafts 16 of the two worm wheels are respectively equipped with metal flat washers 11 and wave springs 12. The two positioning holes 15 on the upper cover 5 pass through the stepped shafts 16 of the two worm wheels and are fastened to the lower shell with screws 2. The center of the left-handed worm wheel 6 has a left-handed thread feature, and the left-handed screw 8 is screwed into the left-handed worm wheel 6. Similarly, the center of the right-handed worm wheel 7 has a right-handed thread feature, and the right-handed screw 9 is screwed into the right-handed worm wheel 7. The ends of the left-handed screw 8 and the right-handed screw 9 are respectively riveted with interference rivets to the connector 10, and the other end inserts the friction retaining ring 14 into the gap screw and is fixed with the positioning ring 13 by interference rivet.

[0025] The output end of the motor is connected to the worm shaft 3, which extends into the reduction gear box from the side and meshes with the outer teeth of the left-handed worm wheel 8 and the right-handed worm wheel 9. The motor body is assembled with the lower shell 4 and fixed with screws 2.

[0026] The working principle of this device: the motor is used as a power source to transmit power to the worm shaft, causing the worm shaft to rotate. At this time, the worm shaft meshes with the left and right worm wheels, and synchronously drives the two worm wheels to rotate simultaneously. The left and right worm wheels have left and right screws respectively.

[0027] Case 1: When the connector rigidly fixed to the left-hand screw is fixed, and the connector on the right-hand screw is fixed to the device of the car steering wheel, the right-hand worm gear drives the right-hand screw to move along the axial direction of the right-hand screw, thereby driving the car steering wheel to move quickly along the axial direction of the right-hand screw.

[0028] Case 2: When the connector rigidly fixed to the right-hand screw is fixed, and the connector of the left-hand screw is fixed to the device on the car steering wheel, the left-hand worm gear will drive the left-hand screw to move along the axis of the left-hand screw, thereby driving the car steering wheel to move quickly along the axis of the left-hand screw.

[0029] In summary, the motor of the device is directly connected and fixed to the reduction box, wherein the lead screw is arranged vertically to the motor axis. The entire device has a compact and small structure, occupies a small space, and has low cost. Moreover, one motor can control the horizontal movement of objects connected to the two left and right lead screws toward and away from each other. Compared with the conventional single motor on the market that can only control the movement of objects connected to a single lead screw, the structure is more compact and the driving speed is faster.

[0030] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the above embodiments do not limit the protection scope of the utility model in any form, and all technical solutions obtained by equivalent replacement and the like fall within the protection scope of the utility model.

[0031] The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

Claims

1. A linear electric telescopic device for a car steering wheel, comprising a motor body, a reduction gear box and a screw, characterized in that: The reduction gearbox includes a box body, a left-handed worm wheel and a right-handed worm wheel, the left-handed worm wheel and the right-handed worm wheel are installed side by side inside the box body, the center of the left-handed worm wheel is provided with a left-handed thread, and the center of the right-handed worm wheel is provided with a right-handed thread, the lead screw includes a left-handed lead screw and a right-handed lead screw, the left-handed lead screw is screwed into the left-handed worm wheel, and the right-handed lead screw is screwed into the right-handed worm wheel, the output end of the motor body is connected to the worm shaft, and the worm shaft extends into the box body from the side of the box body and meshes with the external teeth of the left-handed worm wheel and the right-handed worm wheel.

2. The linear electric telescopic device for a vehicle steering wheel according to claim 1, characterized in that: The housing of the reduction gearbox includes a lower shell and an upper cover. The lower shell is provided with two parallel positioning holes for installing a left-handed worm gear and a right-handed worm gear. A worm hole for installing a worm shaft is provided at the side end of the lower shell. The worm and the hole positioning hole are perpendicular to each other in the axial direction.

3. The linear electric telescopic device for a vehicle steering wheel according to claim 2, characterized in that: The step shafts of the left-handed worm gear and the right-handed worm gear are respectively provided with metal flat washers and wave springs.

4. The linear electric telescopic device for a vehicle steering wheel according to claim 3, characterized in that: The two positioning holes on the upper cover respectively pass through the stepped shafts of the left-handed worm gear and the right-handed worm gear and are then fastened to the lower shell with screws.

5. The linear electric telescopic device for a vehicle steering wheel according to claim 1, characterized in that: The ends of the left-hand screw and the right-hand screw are respectively connected by interference riveting, and the other end of the friction retaining ring is inserted into the gap screw and fixed by interference riveting with a positioning ring.

6. The linear electric telescopic device for a vehicle steering wheel according to claim 1, characterized in that: The motor body and the lower shell are assembled and fixed with screws.

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