WO2024090733A1

WO2024090733A1 - Gearbox

Info

Publication number: WO2024090733A1
Application number: PCT/KR2023/010976
Authority: WO
Inventors: 조찬기; 박건영; 황범진; 이세환
Original assignee: 주식회사 디에스시동탄
Priority date: 2022-10-26
Filing date: 2023-07-27
Publication date: 2024-05-02
Also published as: KR20240058301A

Abstract

A gearbox according to an embodiment comprises: a case disposed perpendicular to a lead screw; a worm gear provided on the inner top of the case and rotated by means of a motor; a worm wheel nut provided at the inner bottom of the case, and having the inner side engaged with the lead screw and the outer side having a helical shape; one or more helical gears provided on the inside of the case, arranged between the worm gear and the worm wheel nut, and transmitting power between the worm gear and the worm wheel nut; a driven shaft provided on the inside of the case and provided on each of the one or more helical gears; inner bushings provided at both ends of each driven shaft; and outer bushings provided inside the case and provided at both ends of each driven shaft, and accommodating the inner bushings and the driven shaft.

Description

gearbox

The Present Disclosure relates to a gearbox installed in a vehicle seat.

The gearbox is installed under the seat and is used to move the seat back and forth. An example of a gearbox is published in Korean Patent Publication No. 10-2024526.

As the gearbox is designed to raise the position of the vehicle seat from the floor pad, the height is changed by increasing the number of helical gears in the gearbox. However, since the helical gear generates thrust in the axial direction, the gearbox has a problem in that noise is generated due to collision between the helical gear and the inside of the gearbox in the axial direction.

The aim is to provide a gearbox that can attenuate noise caused by collisions in the axial direction of helical gears.

A gearbox according to an embodiment includes a case disposed perpendicular to a lead screw; A worm gear provided on the inner top of the case and rotated by a motor; A worm wheel nut is provided at the inner bottom of the case, the inner side is engaged with the lead screw, and the outer side has a helical shape; One or more helical gears provided on the inside of the case, arranged between the worm gear and the worm wheel nut, and transmitting power between the worm gear and the worm wheel nut; A driven shaft provided on the inside of the case and provided on each of one or more helical gears; Inner bushings provided at both ends of each driven shaft; and an outer bushing that is provided inside the case and is provided on both ends of each driven shaft, and accommodates the inner bushing and the driven shaft.

A key may be formed on the outer peripheral surface of the inner bushing according to the embodiment.

A key groove that accommodates the key of the inner bushing may be formed on the inner peripheral surface of the outer bushing according to the embodiment, and a key may be formed on the outer peripheral surface.

A key groove that accommodates the key of the outer bushing may be formed in the case according to the embodiment.

The key of the inner bushing according to the embodiment may be formed in a semicircular shape.

The gearbox according to the embodiment can reduce noise generated in the axial direction of the helical gear.

The gearbox according to the embodiment can improve the clearance that occurs in the axial direction of the helical gear.

1 is a perspective view of a gearbox according to an embodiment.

Figure 2 is an exploded view of a gearbox according to an embodiment.

Figure 3 is a partially exploded view of a gearbox according to an embodiment.

Figure 4 is a diagram showing an example of use of a gearbox according to an embodiment.

The advantages and features of the present disclosure and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. The present embodiments are merely provided to ensure that the present disclosure is complete and to those skilled in the art to which the present disclosure pertains. It is provided to fully inform the person of the scope of the invention, and the present disclosure is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

With reference to the drawings below, the gearbox 100 (hereinafter referred to as 'gearbox 100') according to the embodiment will be described in detail.

Figure 1 is a perspective view of the gearbox 100, Figure 2 is an exploded view of the gearbox 100, Figure 3 is a partially exploded view of the gearbox 100, and Figure 4 shows an example of use of the gearbox 100. It is a drawing.

Referring to Figures 1 and 2, the gearbox 100 includes a case 110, a worm gear 120, a worm wheel nut 130, a helical gear 140, a driven shaft 150, an inner bushing 160, and an outer Includes bushing 170.

Referring to FIG. 1, the case 110 is disposed perpendicular to the leadscrew 200, is disposed between the vehicle seat (not shown) and the lead screw 200, and is capable of withstanding the load of the vehicle seat and driver. It is supported by the upper rail 300. For reference, the upper rail 300 is arranged in a supported state by a fixed rail (not shown) and supports the gearbox 100 at a predetermined distance from the lead screw 200, so that the gear box 100 and the lead screw (200) The force applied between them can be reduced.

The height of the case 110 may vary depending on the gap between the vehicle seat and the lead screw 200.

Referring to FIG. 2, the worm gear 120 is provided on the upper inner side of the case 110 and is rotated by a motor (not shown).

The worm wheel nut 130 is provided at the inner bottom of the case 110. The inside of the worm wheel nut 130 is engaged with the lead screw 200, and the outside of the worm wheel nut 130 has a helical shape.

One or more helical gears 140 are provided inside the case 110 and are arranged between the worm gear 120 and the worm wheel nut 130.

The helical gear 140 transmits power between the worm gear 120 and the worm wheel nut 130.

Looking at the process in which the worm wheel nut 130 moves in the axial direction of the lead screw 200, when the worm gear 120 coupled to the main shaft rotates, the helical gear 140 arranged to mesh with the worm gear 120 rotates. do. The helical gears 140 are arranged between the worm gear 120 and the worm wheel nut 130, and each helical gear 140 rotates.

Accordingly, since the outer side of the worm wheel nut 130 is arranged and rotated to mesh with the helical gear 140, the inner side of the worm wheel nut 130 is rotated by the lead screw 200. At this time, the lead screw 200 is fixed, and the worm wheel nut 130 moves in the axial direction of the lead screw 200.

Figure 3 is a partially enlarged view showing the coupling relationship between the helical gear 140, driven shaft 150, inner bushing 160, and outer bushing 170.

Referring to FIG. 3, the driven shaft 150 is provided on each helical gear 140. The driven shaft 150 is disposed in an exposed manner on the left and right sides of the helical gear 140. The driven shaft 150 may be key-keyway coupled to be connected to the helical gear 140, or may be injection molded integrally with the helical gear 140.

Referring to FIG. 2, the inner bushing 160 is located inside the case 110 and is provided at both ends of each driven shaft 150.

The outer bushing 170 is provided at both ends of each driven shaft 150 and accommodates the inner bushing 160 and the driven shaft 150. In other words, the outer bushing 170 is arranged to surround the inner bushing 160 and the driven shaft 150. However, it is preferable that the inner peripheral surface of the outer bushing 170 has a longer diameter than the outer peripheral surface of the inner bushing 160.

Referring again to FIG. 3, a key 162 is formed on the outer peripheral surface of the inner bushing 160, and the inner bushing 160 may be composed of an inner bushing body 161 and a key 162. The key 162 of the inner bushing 160 may have a semicircular shape.

A key groove 173 corresponding to the key 162 of the inner bushing 160 may be formed on the inner peripheral surface of the outer bushing 170, and a key 172 corresponding to the case 110 may be formed on the outer peripheral surface of the outer bushing 170. Can be formed, so the outer bushing 170 can be composed of an outer bushing body 171, a key 172, and a key groove 173.

Figure 4 is a diagram showing an example of use of the inner bushing 160 within the outer bushing 170 as the helical gear 140 rotates.

Referring to FIG. 4, as the key 162 of the inner bushing 160 is located in the key groove 173 of the outer bushing 170, the inner bushing 160 moves at a predetermined angle based on the key 162. You can.

Therefore, as the helical gear 140 rotates, thrust is generated in the axial direction, and the driven shaft 150 comes into contact with the inner bushing 160. The inner bushing 160 may be vibrated within the outer bushing 170 to reduce the thrust of the driven shaft 150. Additionally, the inner bushing 160 may make noise generated when the driven shaft 150 presses the outer bushing 170.

And a key groove 111 corresponding to the key 172 of the outer bushing 170 may be formed inside the case 110.

Referring to Figure 2, the key groove 111 of the case 110 accommodates the key 172 of the outer bushing 170 and prevents the rotation of the outer bushing 170, so that the outer bushing 170 is a helical gear ( 140), the shaking phenomenon can be prevented.

The gearbox according to the embodiment has the advantage of significantly lower noise compared to the prior art (Korean Patent Registration No. 10-20204526) by reducing the shock generated by axial thrust.

Claims

Case positioned perpendicular to the leadscrew;

a worm gear provided at the inner top of the case and rotated by a motor;

a worm wheel nut provided at the inner bottom of the case, the inner side engaged with the lead screw, and the outer side having a helical shape;

One or more helical gears provided inside the case, arranged between the worm gear and the worm wheel nut, and transmitting power between the worm gear and the worm wheel nut;

a driven shaft provided inside the case and provided on each of the one or more helical gears;

Inner bushings provided at both ends of each of the driven shafts; and

A gearbox comprising: an outer bushing provided inside the case and provided at both ends of each driven shaft, and accommodating the inner bushing and the driven shaft.
According to paragraph 1,

A key is formed on the outer peripheral surface of the inner bushing,

A key groove for receiving the key of the inner bushing is formed on the inner peripheral surface of the outer bushing, and a key is formed on the outer peripheral surface,

A gearbox in which a key groove for receiving the key of the outer bushing is formed in the case.
According to paragraph 2,

Gearbox, wherein the key of the inner bushing is formed in the shape of a semicircle.