HDM automobile seat horizontal driver assembly

Abstract

The utility model discloses an HDM automobile seat horizontal driver assembly which comprises a first shell, a second shell, a worm, a worm gear and a shaft sleeve, the worm, the worm gear and the shaft sleeve are all arranged between the first shell and the second shell, the worm gear is provided with an axially-through threaded hole, a protruding ring is arranged on the side face of the shaft sleeve, a step is formed through the protruding ring, and the protruding ring is arranged close to the worm gear. The height difference part of the step is transited through an inclined surface; a limiting block is further arranged on the convex ring, a first groove is formed in the position, corresponding to the limiting block, of the first shell or the second shell, and the first shell and the second shell are matched through the first groove to be used for containing the limiting block so as to limit rotation of the shaft sleeve; contact faces matched with the inclined faces are arranged at the positions, corresponding to the inclined faces of the shaft sleeve, of the first shell and the second shell, and when the first shell and the second shell are combined to install the worm, the worm gear and the shaft sleeve, the inclined faces on the shaft sleeve tightly abut against the contact faces. According to the scheme, by improving the matching structure of the shaft sleeve and the shell, shaking is restrained, and transmission stability is improved.

Description

Technical Field

[0001] The utility model relates to the adjustment of automobile seats, specifically to the HDM horizontal drive assembly for automobile seats. Background Art

[0002] The horizontal adjustment function of automobile seats is usually realized by an electric drive, and its core components include a worm and worm gear transmission mechanism and a lead screw structure cooperating therewith. Existing horizontal drives usually adopt a reduction gearbox composed of a left housing and a right housing, and internally provided with a mutually meshing worm and worm gear. The center of the worm gear integrates a lead screw thread, and the rotation of the lead screw drives the seat to move back and forth. To reduce the frictional loss between the end of the worm gear and the inner wall of the reduction gearbox, wear-resistant rings are usually arranged at both ends of the worm gear to provide radial support and reduce wear.

[0003] However, in practical applications, especially when the vehicle seat is frequently reset or bears dynamic loads, the rotation of the lead screw is likely to generate a combined axial and radial wobble. This wobble will cause a gap to form between the wear-resistant ring and the inner wall of the reduction gearbox, thereby causing vibration and noise. Under long-term action, the expansion of the gap not only accelerates the wear of the wear-resistant ring and the housing, but also may cause debris to enter the transmission pair, affecting the transmission accuracy and shortening the service life of the drive. Although the prior art prevents the wear-resistant ring from rotating with the worm gear through a circumferential positioning structure, the suppression effect on the wobble problem is limited and it is difficult to meet the stability requirements under high-frequency and high-intensity working conditions. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide an HDM horizontal drive assembly for automobile seats, which suppresses wobble and improves transmission stability by improving the matching structure between the bushing and the housing.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] An HDM horizontal drive assembly for automobile seats includes a housing one, a housing two, a worm, a worm gear, and a bushing all arranged between the housing one and the housing two. The worm gear has an axially penetrating threaded hole for threadedly connecting a lead screw on the seat. The bushing is coaxially sleeved on the shoulder at the end of the worm gear to limit the wobble of the lead screw. A convex ring is arranged on the side surface of the bushing, and a step is formed through this convex ring. The position of the convex ring is close to the worm gear, and the height difference of the step is transitioned through an inclined surface; a limiting block is also arranged on the convex ring, and a groove one is arranged at the position corresponding to the limiting block on the housing one or the housing two, and the housing one and the housing two are mutually matched through the groove one to accommodate the limiting block to limit the rotation of the bushing; a contact surface adapted to the inclined surface on the bushing is arranged at the position corresponding to the inclined surface on the bushing on the housing one and the housing two. When the housing one and the housing two are assembled to install the worm, the worm gear, and the bushing, the inclined surface on the bushing is in close contact with the contact surface.

[0007] As a further improvement of the present utility model, through grooves corresponding to the size of the bushing are provided on the first housing and the second housing, and the two through grooves are combined to form a through hole for passing through the bushing and the lead screw on the seat; the size of the through hole corresponds to the size of the bushing, and the depth of the through hole is greater than the length of the bushing located in the through hole, so that the bushing can move axially in the through hole, and the inclined surface on the bushing is in close contact with the contact surface.

[0008] As a further improvement of the present utility model, a gasket is further provided between the gear of the worm and the bushing. The gasket is provided with a limiting ear, and the limiting ear is located between adjacent teeth on the gear of the worm for the worm to drive the gasket to rotate.

[0009] As a further improvement of the present utility model, the limiting ear and the gear of the worm cooperate with each other to provide a thrust for the gasket to move towards the bushing.

[0010] As a further improvement of the present utility model, at least a part of the limiting ear is located between adjacent teeth on the gear of the worm, and a part of it contacts the end face of the gear, and the contacting part provides a thrust for the gasket to move towards the bushing.

[0011] As a further improvement of the present utility model, a second groove for the limiting ear to be embedded is provided at the position of the gear of the worm corresponding to the gasket, and the limiting ear has elasticity. After the limiting ear is embedded in the second groove, it abuts against the bottom of the second groove to provide a thrust for the gasket to move towards the bushing, so that the inclined surface of the bushing presses tightly against the contact surface.

[0012] As a further improvement of the present utility model, the gasket is coaxially arranged with the worm, and the diameter of the gasket is larger than the outer diameter of the gear of the worm; limiting grooves are provided on the first housing and the second housing at positions corresponding to the gasket, and at least a part of the bushing is axially located at the position of the limiting groove; the limiting groove is used to limit the minimum distance between the gasket and the gear of the worm.

[0013] Advantages of the present utility model:

[0014] Through the cooperation of the convex ring on the side of the bushing and the inclined surface of the inner contact surface of the housing, and the fitting of the limiting block and the groove, the circumferential rotation and axial movement of the bushing are effectively inhibited, thereby reducing the combined shaking of the lead screw; at the same time, the close contact between the inclined surface and the contact surface increases the contact area, reduces the local stress, and avoids vibration and wear caused by the expansion of the gap. Description of the Drawings

[0015] Figure 1 is a schematic cross-sectional structure diagram of the present utility model;

[0016] Figure 2 is a schematic three-dimensional structure diagram of the present utility model without the second housing installed;

[0017] Figure 3 This is the front view structural schematic diagram of the present utility model without the housing II installed.

[0018] Figure 4 This is the structural schematic diagram of the cooperation between the turbine and the gasket of the present utility model.

[0019] Figure 5 This is the schematic diagram of another implementation scheme of the cooperation between the turbine and the gasket of the present utility model.

[0020] Figure 6 This is the schematic diagram of yet another implementation scheme of the cooperation between the turbine and the gasket of the present utility model.

[0021] Reference numerals in the drawings: 11, housing I; 12, housing II; 13, contact surface; 14, through groove; 15, limit groove; 31, worm; 32, worm wheel; 321, threaded hole; 322, wheel shoulder; 323, second groove; 33, bushing; 331, convex ring; 332, inclined surface; 333, limit block; 334, first groove; 4, gasket; 41, limit ear. Specific embodiments

[0022] The following will further elaborate on the present utility model in conjunction with the embodiments given in the accompanying drawings.

[0023] Refer to Figure 1-6 As shown, a kind of HDM automotive seat horizontal drive assembly in this embodiment includes a housing I 11, a housing II 12, a worm 31, a worm wheel 32, and a bushing 33 that are all arranged between the housing I 11 and the housing II 12. The worm wheel 32 has an axially penetrating threaded hole 321, and this threaded hole 321 is used for threaded connection with the lead screw on the seat. The bushing 33 is coaxially arranged on the wheel shoulder 322 at the end of the worm wheel 32 to limit the shaking of the lead screw. A convex ring 331 is arranged on the side surface of the bushing 33, and a step is formed through this convex ring 331. The position of the convex ring 331 is close to the worm wheel 32, and the height difference of the step is transitioned through an inclined surface 332; a limit block 333 is also arranged on the convex ring 331, and a first groove 334 is arranged at the position corresponding to the limit block 333 on the housing I 11 or the housing II 12, and the housing I 11 and the housing II 12 are mutually cooperated through the first groove 334 to accommodate the limit block 333 to limit the rotation of the bushing 33; contact surfaces 13 adapted to the inclined surface 332 on the bushing 33 are arranged at the positions corresponding to the inclined surface 332 on the bushing 33 on the housing I 11 and the housing II 12. When the housing I 11 and the housing II 12 are assembled and installed with the worm 31, the worm wheel 32, and the bushing 33, the inclined surface 332 on the bushing 33 is in close contact with the contact surface 13.

[0024] When the housing 11 and the housing 2 12 are fastened and assembled by bolts, the inclined surface 332 of the sleeve 33 is tightly abutted against the contact surface 13 of the inner wall of the housing to form an axial preload. The limit block 333 is embedded in the groove 134 of the housing, and the circumferential rotation of the sleeve 33 is limited by the contact between the side wall of the groove 134 and the side of the limit block 333. The inclined surface 332 of the sleeve 33 and the contact surface 13 of the housing form a reverse support due to friction resistance, offsetting the radial and axial shaking of the screw rod on the worm gear 32 and the sleeve 33. The transition design of the inclined surface 332 increases the contact surface 13 of the sleeve 33 and the housing, disperses the load transmitted by the worm gear 32, and reduces local stress concentration; at the same time, the multi-directional connection relationship between the sleeve 33 and the housing (radial interlocking, axial abutment, circumferential limit) together constitutes a three-dimensional constraint, which improves the overall structural rigidity. As shown in the reference figure, the groove is only on one of the housings, and the groove is blocked by the other housing to limit the limit block 333 in the groove.

[0025] In a further configuration, a through groove 14 having a size corresponding to that of the sleeve 33 is provided on the shell 1 11 and the shell 2 12, and the two through grooves 14 are combined to form a through hole for passing the sleeve 33 and the screw rod on the seat; the size of the through hole corresponds to the size of the sleeve 33, and the depth of the through hole is greater than the length of the sleeve 33 in the through hole, so that the sleeve 33 can move axially in the through hole, so that the inclined surface 332 on the sleeve 33 is in close contact with the contact surface 13.

[0026] The depth of the through hole is designed so that the sleeve 33 can be adjusted in position by axial movement during installation, and its inclined surface 332 is adaptively fitted with the contact surface 13 of the housing. The tight fit or extremely small clearance fit (axially movable but radially constrained) between the sleeve 33 and the inner wall of the through hole allows the sleeve 33 to fine-tune its position along the axial direction of the through hole when the worm wheel 32 and the screw rod undergo slight deformation under dynamic load, ensuring that the inclined surface 332 is always in close contact with the contact surface 13.

[0027] In order to reduce the wear between the shaft sleeve 33 and the gear of the worm wheel 32, a gasket 4 is provided between the gear of the worm wheel 32 and the shaft sleeve 33. A limiting ear 41 is provided on the gasket 4. The limiting ear 41 is located between adjacent teeth on the gear of the worm wheel 32 so that the worm wheel 32 can drive the gasket 4 to rotate.

[0028] The gasket 4 is embedded in the gap between the teeth of the worm wheel 32 through the limiting ear 41. When the worm wheel 32 rotates, the side wall of its teeth pushes the limiting ear 41, driving the gasket 4 to rotate synchronously. It can isolate the gears of the worm wheel 32 and the shaft sleeve 33, reduce friction loss, and the contact surface between the gasket 4 and the shaft sleeve 33 can be a smooth surface to reduce the friction between the two. At the same time, the gasket 4 contacts the gear end face of the worm wheel 32 in the axial direction, evenly transmitting the axial thrust of the worm wheel 32 to the shaft sleeve 33, so that the inclined surface 332 of the shaft sleeve 33 and the contact surface 13 of the housing are more closely abutted.

[0029] Preferably, the limiting ear 41 cooperates with the gear of the worm wheel 32 to provide a thrust for the gasket 4 to move towards the bushing 33.

[0030] Based on this solution, the following two implementation manners can be specifically formed:

[0031] 1. Refer to Figure 6 As shown, at least a part of the limiting ear 41 is located between adjacent teeth of the gear of the worm wheel 32, and a part of it contacts the end face of the gear, and the contacting part provides a thrust for the gasket 4 to move towards the bushing 33. The limiting ear 41 can be bent to form a triangle, with one end embedded between the teeth of the worm wheel 32 and the other part fitting against the gear end face. This solution can enable the gasket 4 to be linked with the gear through the limiting ear 41 and also provide an axial thrust, so that the inclined surface 332 of the bushing 33 remains in contact with the contact surface 13.

[0032] 2. Refer to Figure 5 As shown, a second groove 323 for the limiting ear 41 to be embedded is provided at the position of the gear of the worm wheel 32 corresponding to the gasket 4, and the limiting ear 41 has elasticity. After the limiting ear 41 is embedded in the second groove 323, it abuts against the bottom of the second groove 323 to provide a thrust for the gasket 4 to move towards the bushing 33, so that the inclined surface 332 of the bushing 33 presses against the contact surface 13. The gasket 4 is made of spring steel sheet, and the limiting ear 41 is formed by bending a part of the gasket 4. After being embedded in the second groove 323 of the gear of the worm wheel 32, its bent part abuts against the bottom of the second groove 323 due to elastic deformation, generating a continuous pre-tightening force. The depth of the second groove 323 of the worm wheel 32 matches the elastic modulus of the limiting ear 41, so that the pre-tightening force is always within a reasonable range, avoiding plastic deformation caused by overload.

[0033] In order to further provide a tight contact fit between the inclined surface 332 of the bushing 33 and the contact surface 13, the gasket 4 is coaxially arranged with the worm wheel 32, and the diameter of the gasket 4 is larger than the outer diameter of the gear of the worm wheel 32; limiting grooves 15 are provided at the positions of the first housing 11 and the second housing 12 corresponding to the gasket 4, and at least a part of the bushing 33 is axially located at the position of the limiting grooves 15; the limiting grooves 15 are used to limit the minimum distance between the gasket 4 and the gear of the worm wheel 32.

[0034] The expanded diameter of the gasket 4 causes its edge to be embedded in the annular limiting groove 15 of the housing. The side wall of the limiting groove 15 has a clearance fit with the outer edge of the gasket 4, restricting the axial movement range of the gasket 4. When the worm wheel 32 rotates, the outer edge of the gasket 4 is restricted within the limiting groove 15, maintaining the contact fit between the gasket 4 and the bushing 33. The matching relationship between the limiting groove 15 and the gasket 4 forms an axial positioning reference, simplifying the assembly process.

[0035] The above are only the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions falling within the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A horizontal drive assembly for an HDM automobile seat, comprising a housing 1, a housing 2, a worm, a worm wheel, and a sleeve, all of which are arranged between the housing 1 and the housing 2. The worm wheel has an axially through threaded hole, which is used to thread the screw on the seat. The sleeve is coaxially sleeved on the wheel shoulder at the end of the worm wheel to limit the shaking of the screw, and is characterized in that: A convex ring is provided on the side of the sleeve, and a step is formed by the convex ring. The convex ring is arranged close to the worm wheel, and the height difference of the step is transitioned by an inclined surface. A limit block is also provided on the convex ring, and a groove 1 is provided on the shell one or the shell two at a position corresponding to the limit block, and the shell one and the shell two cooperate with each other through the groove one to accommodate the limit block to limit the rotation of the sleeve. Contact surfaces matching with the inclined surfaces on the sleeve are provided on the shell one and the shell two at positions corresponding to the inclined surfaces on the sleeve, and when the shell one and the shell two are combined to install the worm, worm wheel and sleeve, the inclined surface on the sleeve is tightly abutted against the contact surface.

2. The HDM vehicle seat horizontal actuator assembly according to claim 1, characterized in that: The shells one and two are provided with through grooves whose sizes correspond to the sizes of the sleeves, and the two through grooves are combined to form a through hole for passing the sleeves and the screw rod on the seat; the size of the through hole corresponds to the size of the sleeves, and the depth of the through hole is greater than the length of the sleeve in the through hole, so that the sleeve can move axially in the through hole, and the inclined surface on the sleeve is in close contact with the contact surface.

3. The HDM vehicle seat horizontal actuator assembly according to claim 2, characterized in that: A gasket is also provided between the gear of the worm wheel and the shaft sleeve. A limiting ear is arranged on the gasket. The limiting ear is located between adjacent teeth on the gear of the worm wheel so that the worm wheel can drive the gasket to rotate.

4. The HDM vehicle seat horizontal actuator assembly according to claim 3, characterized in that: The limiting ear cooperates with the gear of the worm wheel to provide a thrust for the gasket to move toward the shaft sleeve.

5. The HDM vehicle seat horizontal actuator assembly according to claim 4, characterized in that: At least a portion of the limiting ear is located between adjacent teeth on the gear of the worm wheel, and a portion of the limiting ear contacts the end surface of the gear, and the contacting portion provides a thrust for the gasket to move toward the sleeve.

6. The HDM vehicle seat horizontal actuator assembly according to claim 4, characterized in that: A groove 2 for a limiting ear to be embedded is provided at the position of the worm gear corresponding to the gasket, and the limiting ear has elastic force. After the limiting ear is embedded in the groove 2, it abuts against the bottom of the groove 2 to provide a thrust for the gasket to move toward the sleeve, so that the inclined surface of the sleeve can press against the contact surface.

7. The HDM vehicle seat horizontal actuator assembly according to any one of claims 3 to 6, characterized in that: The gasket is coaxially arranged with the worm wheel, and the diameter of the gasket is larger than the outer diameter of the gear of the worm wheel; a limiting groove is arranged at the position corresponding to the gasket on the shell one and the shell two, and at least a part of the sleeve is axially located at the position of the limiting groove; the limiting groove is used to limit the minimum distance between the gasket and the gear of the worm wheel.

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