Automobile electric sliding rail driving HDM gear box

Abstract

The utility model provides an automobile electric sliding rail driving HDM gear box which comprises a reduction gearbox upper cover, a reduction gearbox lower cover, a bevel gear and a worm, the two ends of the bevel gear are each provided with a metal gasket and a bearing, and the outer edge of each metal gasket is provided with two protruding clamping jaws; the worm is connected with a driving piece with an output shaft being a square shaft, four eccentric convex points are arranged on the inner hole wall of the worm, the eccentric convex points on the upper side and the lower side deviate anticlockwise in the vertical direction, and the eccentric convex points on the left side and the right side deviate clockwise in the horizontal direction; a bump is arranged on the reduction gearbox lower cover; the clamping jaws are arranged on the metal gasket, so that the circumferential gap between the helical gear and the metal gasket is reduced, and the impact and noise during rotation are reduced; the four eccentric convex points are arranged on the inner hole wall of the worm, the square shaft can make contact with the eccentric convex points in advance when rotating, and the transmission gap between the input square shaft and the worm is reduced; the bump is arranged on the reduction gearbox lower cover, so that the reduction gearbox upper cover and the reduction gearbox lower cover are asymmetric, and the automatic production line can identify the input end of the HDM.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat technology, and in particular to an automotive electric slide rail driven HDM gearbox. Background Technology

[0002] The automotive electric sliding rail system is a key component for enabling seat fore-and-aft adjustment, and the core of its drive mechanism is the HDM (High-Density Motor) gearbox. With its high power density, high efficiency, and compact structure, the HDM gearbox is an ideal choice for driving electric sliding rails.

[0003] Currently, automotive electric sliding rail-driven HDM gearboxes use a dual-point input shaft on the same side, but this results in large transmission clearances. Within the HDM gearbox, the metal shims positioned between the helical gears and the plastic bearings have movement clearances with the helical gears themselves, generating impacts and noise during operation. Furthermore, the input and output surfaces of the HDM gearbox housing are at the same height, making it difficult for automated production lines to recognize them. Utility Model Content

[0004] This utility model aims to provide an automotive electric slide rail driven HDM gearbox, which reduces the clearance between the input motor shaft and the worm gear, as well as the impact and noise caused by excessive circumferential clearance between the helical gear and the metal shim; through the asymmetrical structure, the input end of the HDM can be easily distinguished by the automated production line.

[0005] Therefore, the technical solution adopted by this utility model is as follows: an electric sliding rail driven HDM gearbox for automobiles, including a gearbox consisting of a gearbox upper cover and a gearbox lower cover, a helical gear set on the gearbox lower cover and a worm gear meshing with the helical gear, with metal shims and bearings arranged sequentially at both ends of the helical gear, and a notch provided on the outer edge of the metal shim, with two protruding claws on both sides of the notch, the claws facing the side closer to the helical gear and inserted between two adjacent teeth of the helical gear;

[0006] The worm gear is connected to a driving component, the output shaft of which is a square shaft. The inner wall of the worm gear is provided with four eccentric protrusions for contact and positioning with the square shaft. The eccentric protrusions on the upper and lower sides are the first group, and the eccentric protrusions on the left and right sides are the second group. The eccentric protrusions of the first group are offset counterclockwise along the vertical direction, and the eccentric protrusions of the second group are offset clockwise along the horizontal direction. The orientation of the eccentric protrusions is the axis of the worm gear.

[0007] The lower cover of the gearbox is provided with a protrusion to distinguish the input end of the HDM.

[0008] As a preferred embodiment of the above solution, the upper cover and lower cover of the gearbox are connected by bolts, with four bolts arranged in a rectangular pattern.

[0009] More preferably, the metal gasket and the bearing are both mounted on the outer circular surfaces at both ends of the helical gear, and the bearing is a plastic bearing.

[0010] More preferably, the upper and lower covers of the gearbox are provided with mounting holes for mounting bearings on both the left and right sides, and shock-absorbing pads are provided on the mounting holes and installed on the outside of the gearbox.

[0011] More preferably, the bump is disposed at the input end of the HDM and has a mounting hole for mounting the worm gear.

[0012] The beneficial effects of this utility model are as follows: By setting a cleat on the metal shim, with the cleat facing towards the side close to the helical gear and inserted between two adjacent teeth of the helical gear, the circumferential clearance between the helical gear and the metal shim is reduced, thereby reducing the impact and noise during rotation; by setting four eccentric protrusions on the inner wall of the worm, the square shaft can contact the eccentric protrusions in advance during rotation, thereby reducing the transmission clearance between the input square shaft and the worm; by setting a protrusion on the lower cover of the gearbox, the upper cover and the lower cover of the gearbox are made asymmetrical, so that the automated production line can identify the input end of the HDM. Attached Figure Description

[0013] Figure 1 This is an exploded view of this utility model.

[0014] Figure 2 This is a cross-sectional view of the present invention.

[0015] Figure 3 This is a schematic diagram of the structure of the metal gasket in this utility model.

[0016] Figure 4 This is a schematic diagram of the installation state of the metal gasket and the helical gear in this utility model.

[0017] Figure 5 This is a schematic diagram of the worm gear in this utility model.

[0018] Figure 6 This is a schematic diagram of the state of the square shaft when it rotates in this utility model.

[0019] Figure 7 This is a schematic diagram of the structure of the gearbox lower cover and the protrusion in this utility model. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] like Figure 1-7As shown, an automotive electric sliding rail driven HDM gearbox includes a gearbox consisting of a gearbox upper cover 1 and a gearbox lower cover 6, a helical gear 3 mounted on the gearbox lower cover 6, and a worm gear 7 meshing with the helical gear 3. The gearbox lower cover 6 has a protrusion 11 for distinguishing the input end of the HDM. The gearbox upper cover 1 and the gearbox lower cover 6 are connected by four bolts 5 arranged in a rectangular pattern.

[0022] Metal shims 4 and bearings 2 are sequentially provided at both ends of the helical gear 3. The outer edge of the metal shim 4 is provided with a notch, and two protruding claws 9 are provided on both sides of the notch. The claws 9 face the side closer to the helical gear 3 and are inserted between two adjacent teeth of the helical gear 3. The metal shims 4 and bearings 2 are both installed on the outer circular surfaces at both ends of the helical gear 3. The bearings 2 are plastic bearings.

[0023] The upper cover 1 and the lower cover 6 of the gearbox both have mounting holes for installing bearings 2 on their left and right sides. Shock-absorbing pads 8 are installed in these mounting holes and are mounted on the outside of the gearbox. A protrusion 11 is located at the input end of the HDM and has mounting holes for installing the worm gear 7.

[0024] The worm 7 is connected to a drive unit (not shown in the figure). The output shaft of the drive unit is a square shaft. Four eccentric protrusions 10 are provided on the inner wall of the worm 7 for contact and limiting with the square shaft. The eccentric protrusions 10 on the upper and lower sides are the first group, and the eccentric protrusions 10 on the left and right sides are the second group. The eccentric protrusions 10 in the first group are offset counterclockwise in the vertical direction, and the eccentric protrusions 10 in the second group are offset clockwise in the horizontal direction. The orientation of the eccentric protrusions 10 is the axis of the worm 7.

[0025] Because the first set of eccentric protrusions is offset counterclockwise and the second set is offset clockwise, when the drive unit starts and the square shaft rotates clockwise, the first set of eccentric protrusions is offset in the opposite direction to the rotation of the square shaft, while the second set is offset in the same direction. Therefore, the clockwise rotating square shaft will first contact the first set of eccentric protrusions, driving the worm to rotate. When the square shaft rotates counterclockwise, the second set of eccentric protrusions is offset in the opposite direction to the rotation of the square shaft, while the first set is offset in the same direction. Therefore, the square shaft will first contact the second set of eccentric protrusions, driving the worm to rotate. By offsetting the direction of the eccentric protrusions, the square shaft can contact the worm earlier, driving the worm to rotate and reducing the transmission clearance between the square shaft and the worm.

[0026] By setting a pawl 9 on the metal shim 4, with the pawl 9 facing towards the side close to the helical gear 3 and inserted between two adjacent teeth of the helical gear 3, the rotation of the helical gear 3 is restricted, and the circumferential clearance between the helical gear 3 and the metal shim 4 is reduced, thereby reducing the impact and noise during rotation; four eccentric protrusions 10 are set on the inner wall of the worm gear 7, which can contact the eccentric protrusions 10 in advance during the rotation of the square shaft, thereby reducing the transmission clearance between the input square shaft and the worm gear 7; a protrusion 11 is set on the lower cover 6 of the gearbox, making the upper cover 1 and the lower cover 6 of the gearbox asymmetrical, so that the automated production line can identify the input end of the HDM.

[0027] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An automotive electric slide rail driven HDM gearbox, characterized in that: The gearbox includes a gearbox consisting of a gearbox top cover (1) and a gearbox bottom cover (6), a helical gear (3) mounted on the gearbox bottom cover (6), and a worm gear (7) meshing with the helical gear (3). Both ends of the helical gear (3) are provided with metal shims (4) and bearings (2) in sequence. The outer edge of the metal shims (4) is provided with a notch, and two protruding claws (9) are provided on both sides of the notch. The claws (9) face the side closer to the helical gear (3) and are inserted between two adjacent teeth of the helical gear (3). The worm (7) is connected to a drive component. The output shaft of the drive component is a square shaft. The inner wall of the worm (7) is provided with four eccentric protrusions (10) for contact and limiting with the square shaft. The eccentric protrusions (10) on the upper and lower sides are the first group, and the eccentric protrusions (10) on the left and right sides are the second group. The eccentric protrusions (10) of the first group are offset counterclockwise in the vertical direction, and the eccentric protrusions (10) of the second group are offset clockwise in the horizontal direction. The orientation of the eccentric protrusions (10) is the axis of the worm (7). The lower cover (6) of the gearbox is provided with a protrusion (11) for distinguishing the input end of the HDM.

2. The automotive electric slide rail driven HDM gearbox according to claim 1, characterized in that: The gearbox upper cover (1) and gearbox lower cover (6) are connected by bolts (5), and there are four bolts (5) arranged in a rectangular shape.

3. The automotive electric slide rail driven HDM gearbox according to claim 1, characterized in that: The metal gasket (4) and the bearing (2) are both mounted on the outer circular surfaces at both ends of the helical gear (3), and the bearing (2) is a plastic bearing (2).

4. The automotive electric slide rail driven HDM gearbox according to claim 3, characterized in that: The upper cover (1) and lower cover (6) of the gearbox are provided with mounting holes for mounting bearings (2) on both the left and right sides. Shock-absorbing pads (8) are provided on the mounting holes and are installed on the outside of the gearbox.

5. The automotive electric slide rail driven HDM gearbox according to claim 1, characterized in that: The bump (11) is located at the input end of the HDM and has a mounting hole for mounting the worm gear (7).

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