CN210196409U - Installation structure of planetary gear and eccentric shaft and speed reducer of automobile seat lifter - Google Patents

Abstract

The utility model discloses a mounting structure of planetary gear and eccentric shaft, including eccentric shaft and planetary gear, the gyration axis of eccentric shaft with the central line of eccentric shaft is parallel, and the eccentric shaft can drive planetary gear makes planar motion on a plane, planar motion include the rotation with planar displacement on the plane, the plane perpendicular to the central line of eccentric shaft still includes the plastics axle sleeve, and the plastics axle sleeve is fixed planetary gear's axle mounting hole in and with axle mounting hole interference fit, plastics axle sleeve cover are in outside the eccentric shaft and with eccentric shaft clearance fit, make the eccentric shaft can pass through the plastics axle sleeve drives planetary gear is in do on the plane planar motion. The utility model also discloses a reduction gear of car seat riser of adopting above-mentioned mounting structure. The utility model discloses can reduce planetary gear and eccentric shaft mounting structure's frictional force, improve product performance and life.

Description

Installation structure of planetary gear and eccentric shaft and speed reducer of automobile seat lifter

Technical Field

The utility model relates to a planetary gear and eccentric shaft's mounting structure and adopt this mounting structure's car seat riser's reduction gear.

Background

The planetary gear can do plane motion in the transmission system, and the plane motion has the autorotation of the planetary gear and the displacement of the planetary gear in a plane. For example, in the "a reducer for a car seat up-down driver" disclosed in the utility model with the publication number CN207583940U, as shown in fig. 3, the planetary gear 7 is in interference fit with the first bearing 8, and the inner hole of the first bearing 8 is in clearance fit with the eccentric shaft 4, when the planetary gear performs the above-mentioned planar motion, the first bearing 8 and the eccentric shaft 4 will generate contact friction, in some transmission mechanisms, the first bearing 8 can be replaced by a metal shaft sleeve, in order to reduce the part wear caused by the contact friction between the bearing 8 and the eccentric shaft 4, a teflon coating and a lubricating oil are generally coated on the bearing 8 or the inner hole of the metal shaft sleeve, but after the structure is used for a period, there is a problem that the teflon coating falls off, the fallen off teflon coating is blended into the lubricating oil to affect the meshing of the gear pair, and the wear of the tooth surface in the gear pair is accelerated, reducing the performance and life of the product.

In addition, the press-fitting force required for press-fitting the bearing or the metal shaft sleeve into the mounting hole of the planetary gear is large, the process difficulty is increased to a certain extent, and if the magnitude of interference between the planetary gear and the bearing or the metal shaft sleeve is reduced, although the press-fitting force can be reduced, the bearing or the metal shaft sleeve can fall off in the use process, so that a product adopting the structure breaks down.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a mounting structure of planetary gear and eccentric shaft reduces the part wearing and tearing that contact friction between planetary gear and the eccentric shaft caused.

The utility model discloses a mounting structure of planetary gear and eccentric shaft, including eccentric shaft and planetary gear, the gyration axis of eccentric shaft with the central line of eccentric shaft is parallel, the eccentric shaft can drive planetary gear makes planar motion on a plane, planar motion include the rotation with planar displacement on the plane, the plane perpendicular to the central line of eccentric shaft, its characterized in that still includes the plastics axle sleeve, the plastics axle sleeve is fixed planetary gear's axle mounting hole in and with axle mounting hole interference fit, the plastics axle sleeve cover be in outside the eccentric shaft and with eccentric shaft clearance fit, make the eccentric shaft can pass through the plastics axle sleeve drives planetary gear is in do on the plane planar motion.

The utility model discloses the last axle mounting hole and the plastic shaft sleeve interference fit of seting up of planetary gear, the plastic shaft sleeve again with an eccentric shaft clearance fit, when planetary gear is planar motion, can reduce the frictional force of plastic shaft sleeve and eccentric shaft on the planetary gear, this plastic shaft sleeve is self-lubricating engineering plastic shaft sleeve, this plastic shaft sleeve product is by engineering plastics or with multiple stopping according to certain proportion after mixing, injection or die pressing take shape. Can be made of nylon (polyamide) polytetrafluoroethylene, polyphenylene sulfide and other antifriction and self-lubricating engineering plastics, and the product has good mechanical properties, such as high tensile strength and good toughness; repeated impact and vibration resistance; excellent wear resistance; the forming and processing are easy; the medium resistance is strong; wide application range, and can be widely applied to the fields of automobile parts, mechanical equipment, electrical and electronic industries, medical instruments, textile machinery, printing machinery, precision instruments and buildings.

For preventing that the plastics axle sleeve from taking place the displacement, the one end of plastics axle sleeve is equipped with spacing protruding edge, planetary gear's axle mounting hole is the counter sink, spacing protruding edge all is located with the plastics axle sleeve in the counter sink, make counter sink and spacing protruding edge cooperation prevent that the plastics axle sleeve from using a time period after or because of the less emergence displacement of magnitude of interference leads to droing.

The utility model discloses a planetary gear meshes with a sun gear mutually and constitutes planetary gear pair, the axis of revolution of sun gear with the central line of eccentric shaft is parallel.

Sun gear fixed mounting is on a dabber, the mesopore that runs through in the axial is seted up to the eccentric shaft, the dabber passes the mesopore of eccentric shaft and with this mesopore clearance fit, the axis of dabber with the gyration axis coincidence of sun gear provides power by external motor, the eccentric shaft is around its gyration axis rotation, drives planetary gear winds in the rotation the gyration axis revolution of dabber makes planetary gear is in do on the plane planar motion.

A second object of the present invention is to provide a speed reducer of a car seat lifter using the above planetary gear and eccentric shaft mounting structure.

The utility model relates to a reducer of an automobile seat lifter, which is provided with a gearbox body and a gearbox cover which can be combined to form an inner cavity of a gearbox, and a transmission mechanism, a planetary gear and an output gear are arranged in the inner cavity of the gear box body, the gear box body is provided with a mandrel, the output gear is provided with an internal gear and a driving gear for outputting power, the output gear is rotatably mounted on the mandrel and enables the internal gear, the driving gear and the mandrel to be coaxial, the planetary gear is meshed with the internal gear and forms a planetary gear pair with small tooth difference, the transmission mechanism can transmit power output by an external motor to the planetary gear, so that the planetary gear tends to do planar motion on a plane vertical to the mandrel under the action of the transmission mechanism and the internal gear, and the planar motion comprises rotation and revolution around the axis of the mandrel;

the inner cavity of the gear box is also provided with a motion decomposition mechanism, the motion decomposition mechanism consists of a floating disc and a pin column and is used for decomposing the trend of the planar motion of the planetary gear into the motions in the X direction and the Y direction which are vertical to each other, and the X direction and the Y direction are both positioned on the plane; the gearbox body is provided with an upper mounting cavity and a lower mounting cavity, a bearing surface is arranged between the upper mounting cavity and the lower mounting cavity, the upper mounting cavity is matched with the floating disc, so that the floating disc is mounted in the upper mounting cavity and is located on the bearing surface, and the floating disc can slide on the bearing surface along the Y direction; the floating disc is provided with a guide sliding groove extending along the X direction, the upper end of the pin is assembled with a pin mounting hole formed in the planetary gear in an interference fit manner, and the lower end of the pin is slidably mounted in the guide sliding groove of the floating disc.

The transmission mechanism comprises a first transmission mechanism and a second transmission mechanism, and the second transmission mechanism consists of a gear, an eccentric shaft and a first bearing; the eccentric shaft is composed of an upper eccentric column and a lower eccentric disc, the eccentric shaft is provided with a middle hole penetrating through the eccentric column and the eccentric disc, the axis of the middle hole is parallel to the axis of the eccentric column, and the eccentric distance of the middle hole relative to the eccentric column is equal to the center distance between the planetary gear and the internal gear; the gear is injection-molded on the eccentric disc, so that the eccentric disc is fixed with the molded gear, and the gear is provided with a balance hole for balancing, so that the center of mass of the gear is on the rotation axis of the gear; a shaft mounting hole is formed in the center of the planet gear, a through hole is formed in the center of the floating disc, the eccentric column sequentially penetrates through the through hole and the shaft mounting hole, and the first bearing is mounted between the bearing mounting hole and the eccentric column; the gear is arranged in the lower mounting cavity, the mandrel penetrates through a middle hole of the eccentric shaft and is in clearance fit with the middle hole, and the axis of the mandrel is superposed with the rotation axis of the gear; the external motor drives the gear to rotate through the first transmission mechanism;

the utility model discloses a speed reducer, first bearing is the plastics axle sleeve, and the plastics axle sleeve can be equipped with spacing protruding edge, the internal gear is one kind promptly and is used for the sun gear with planetary gear engaged with.

The utility model discloses a reduction gear increases the structure aim at of floating disc and round pin post and improves the transmission efficiency of system.

The utility model discloses an in the reduction gear, round pin post and planetary gear can also be integrated into one piece.

The utility model has the advantages of it is following:

1. the utility model discloses in make planar motion's planetary gear through one rather than interference fit's plastics axle sleeve and axle clearance fit, the plastics axle sleeve has self-lubricating effect, can reduce the frictional force between planetary gear transmission process and the axle for replace the metal axle sleeve can avoid the risk that coatings such as teflon brought, improve the life of performance and product.

2. The utility model provides a plastics axle sleeve is equipped with spacing protruding edge, makes its counter sink cooperation with planetary gear can avoid the axle sleeve displacement or drop that the plastics axle sleeve caused because of the assembly magnitude of interference is not enough or use wearing and tearing, guarantee product quality.

Drawings

The drawings in the specification related to the present invention are briefly described below.

Fig. 1 is a schematic perspective view of a reducer of an automobile seat lifter according to the present invention;

fig. 2 is an exploded view of a speed reducer of a car seat lifter according to the present invention;

FIG. 3 is a sectional view of the reducer of the car seat lifter of the present invention;

FIG. 4 is a schematic view of an assembly structure of the planetary gear and the eccentric shaft according to the present invention;

FIG. 5 is a schematic structural diagram of a gearbox body adopted by the reducer of the novel car seat lifter;

FIG. 6 is a schematic structural view of a floating disc used in the present invention;

fig. 7 is a schematic structural view of an output gear adopted by the present invention;

fig. 8 is a sectional view of a reducer for a seat lifter of an automobile according to another embodiment of the present invention;

FIG. 9 is a top plan view of the plastic bushing used in another embodiment of the speed reducer of FIG. 8;

FIG. 10 is a cross-sectional view taken at A-A of FIG. 9;

FIG. 11 is a top plan view of the planetary gear employed in the reducer of FIG. 8 in another embodiment;

fig. 12 is a cross-sectional view taken at B-B in fig. 11.

Description of reference numerals:

1-a gear box body; 1 a-a bearing surface; 1 b-an upper mounting cavity; 1 c-a lower mounting cavity; 2-a worm; 3-a gear; 31-a balancing hole; 4-an eccentric shaft; 41-mesopores; 42-eccentric column; 43-eccentric disc; 5-a floating disc; 51-via holes; 52-a guide chute; 53-circular arc shaped protrusions; 6-pin column; 7-a planetary gear; 7 a-shaft mounting hole; 7 b-a boss; 8-a first bearing; 8 a-plastic shaft sleeve; 8 b-a limiting convex edge; 9-a mandrel; 10-a gasket; 11-an output gear; 111-internal gear; 112-a drive gear; 12-gearbox cover; 14-an adjusting screw; 15-PEEIK gasket; 16-second bearing.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

A decelerator of a seat lift driver for an automobile shown in fig. 1 to 7 is provided with a gear housing 1 and a gear housing cover 12 that can be combined to form an inner cavity of a gear housing, and a transmission mechanism, a planetary gear 7 and an output gear 11 are arranged in the inner cavity of the gear box, a mandrel 9 is fixed on the gear box body 1, the output gear 11 is provided with an internal gear 111 and a driving gear 112 used for outputting power, the output gear 11 is rotatably arranged on the mandrel 9 and enables the internal gear 111, the driving gear 112 and the mandrel 9 to be coaxial, the planetary gear 7 is meshed with the internal gear 111 and forms a planetary gear pair with small tooth difference, that is, the internal gear 111 constitutes a sun gear, and the transmission mechanism can transmit the power output from the external motor to the planetary gears 7, the planetary gear 7 tends to make planar motion on a plane vertical to the mandrel 9 under the action of the transmission mechanism and the internal gear 111, and the planar motion comprises rotation and revolution around the axis of the mandrel 9; that is, the planetary gear rotates while having a planar displacement on the plane.

A motion decomposition mechanism is also installed in the inner cavity of the gear box, consists of a floating disc 5 and a pin 6 and is used for decomposing the trend of planar motion of the planetary gear 7 into motions in the X direction and the Y direction which are vertical to each other, and the X direction and the Y direction are both positioned on a plane; the gear box body 1 is provided with an upper mounting cavity 1b and a lower mounting cavity 1c, a bearing surface 1a is arranged between the upper mounting cavity 1b and the lower mounting cavity 1c, the upper mounting cavity 1b is adaptive to the floating disc 5, so that the floating disc 5 is arranged in the upper mounting cavity 1b and is located on the bearing surface 1a, and the floating disc 5 can slide on the bearing surface 1a along the Y direction; the floating disc 5 is provided with a guide chute 52 extending along the X direction, the upper end of the pin 6 is fitted in interference fit with a pin mounting hole provided on the planetary gear 7, the lower end of the pin 6 is slidably mounted in the guide chute 52 of the floating disc 5, and in order to reduce the contact area between the floating disc 5 and the planetary gear 7, as shown in fig. 6, a circular arc-shaped protrusion 53 is processed on the contact surface between the floating disc 5 and the planetary gear 7. In another embodiment, the pin 6 may be formed integrally with the planet gear 7, as shown in fig. 11 and 12, that is, a boss 7b is formed integrally with the planet gear 7, so that the boss 7b is slidably mounted in the guide chute 52 of the floating disc 5.

The transmission mechanism comprises a first transmission mechanism and a second transmission mechanism, and as shown in fig. 2 and 3, the second transmission mechanism consists of a gear 3, an eccentric shaft 4 and a first bearing 8; the eccentric shaft 4 is composed of an upper eccentric post 42 and a lower eccentric disc 43. The eccentric shaft 4 is provided with a central hole 41 penetrating the eccentric column 42 and the eccentric disc 43, the axis of the central hole 41 is parallel to the axis of the eccentric column 42, and the eccentricity of the central hole 41 relative to the eccentric column 42 is equal to the center distance between the planetary gear 7 and the internal gear 111; the gear 3 is injected on the eccentric disc 43, so that the eccentric disc 43 is fixed with the molded gear 3, and the gear 3 is provided with the balance hole 31 for balancing, so that the center of mass of the gear 3 is on the rotating axis of the gear, and other structures can be adopted to replace the balance hole to achieve the purpose that the center of mass is on the rotating axis; a shaft mounting hole 7a is formed in the center of the planetary gear 7, a through hole 51 is formed in the center of the floating disc 5, the eccentric column 42 sequentially penetrates through the through hole 51 and the shaft mounting hole 7a, and the first bearing 8 is mounted between the shaft mounting hole 7a and the eccentric column 42; the gear 3 is placed in the lower mounting cavity 1c, the mandrel 9 passes through the central hole 41 of the eccentric shaft 4 and is in clearance fit with the central hole 41, and the axis of the mandrel 9 is overlapped with the rotation axis of the gear 3; the external motor provides power to drive the gear 3 to rotate through the first transmission mechanism;

in addition, the output gear 11 is provided with a groove in which the spacer 10 having a teflon material coated on the surface thereof is seated such that the spacer 10 is seated on the top surface of the eccentric cylinder 42, and the spindle 9 passes through the central through hole of the spacer 10.

The first transmission mechanism is provided with a worm 2 and a second bearing 16, the gear box body 1 is provided with a shaft hole communicated with the lower mounting cavity 1c, the worm 2 is tightly matched on a power shaft of an external motor and is installed in the shaft hole, the axis of the worm 2 is parallel to the X direction, the worm 2 is meshed with a gear 3, the gear 3 is a helical gear, and the second bearing 16 is installed between the shaft hole and the end part of the power shaft penetrating out of the worm 2; the first gear mechanism is further provided with an adjusting screw 14 made of plastic and a PEEIK washer 15, the adjusting screw 14 being screwed into the shaft hole of the gear housing 1 such that the second bearing 16 is located between the adjusting screw 14 and the worm 2. The PEEIK washer 15 is fitted into a recess provided in the end face of the adjusting screw 14 and causes the power shaft of the external motor to pass through the end of the second bearing 16 and abut against the PEEIK washer 15. The structure and the working principle of the speed reducer of the automobile seat lifter can be seen in the utility model patent of No. CN207583940U, namely, the speed reducer for the automobile seat lifting driver, which is filed as 2017, 11, 14 and no further description is given here. In addition, for the purpose of making the output gear 11 work normally, besides the connection manner that the spindle 9 is fixedly connected with the gear box body 1 and the spindle 9 rotates relative to the output gear 11, the output gear 11 and the spindle 9 can also be in interference fit, and the lower end of the spindle 9 is rotatably installed on the gear box body 1, as shown in fig. 3.

The utility model discloses in, first bearing 8 adopts plastic shaft sleeve 8a, and axle mounting hole 7a makes plastic shaft sleeve 8a together fixed with planetary gear with plastic shaft sleeve 8a interference fit, plastic shaft sleeve 8a and 4 clearance fit of eccentric shaft, and eccentric shaft 4's axis of revolution is parallel with eccentric shaft 4's central line. In a preferred embodiment, the plastic bushing 8a is cylindrical and the corresponding shaft mounting hole 7a is also cylindrical, and the plastic bushing 8a is press-fitted into the shaft mounting hole 7a with a magnitude of interference required by design to complete the assembly.

In another embodiment, as shown in fig. 8-12, to prevent the plastic bushing 8a from being displaced, the plastic bushing 8a may be provided with a limiting convex edge 8b, the shaft mounting hole 7a is modified to be a countersunk hole, and both the plastic bushing 8a and the limiting convex edge 8b are located in the countersunk hole to make the limiting convex edge cooperate with the countersunk hole.

The above embodiments of the present invention are not right the utility model discloses the limited protection scope, the utility model discloses an embodiment is not limited to this, all kinds of basis according to the above-mentioned of the utility model discloses an under the above-mentioned basic technical thought prerequisite of the utility model, right according to ordinary technical knowledge and the conventional means in this field the modification, replacement or the change of other multiple forms that above-mentioned structure made all should fall within the protection scope of the utility model.

Claims (6)

1. A planetary gear and eccentric shaft mounting structure comprises an eccentric shaft (4) and a planetary gear (7), wherein the rotation axis of the eccentric shaft (4) is parallel to the central line of the eccentric shaft (4), the eccentric shaft (4) can drive the planetary gear (7) to make plane motion on a plane, the plane motion comprises autorotation and plane displacement on the plane, the plane is perpendicular to the central line of the eccentric shaft (4), the structure is characterized by further comprising a plastic shaft sleeve (8a), the plastic shaft sleeve (8a) is fixed in a shaft mounting hole (7a) of the planetary gear (7) and is in interference fit with the shaft mounting hole (7a), the plastic shaft sleeve (8a) is sleeved outside the eccentric shaft (4) and is in clearance fit with the eccentric shaft (4), so that the eccentric shaft (4) can drive the planetary gear (7) to make the plane on the plane through the plastic shaft sleeve (8a) And (6) moving.

2. A planetary gear and eccentric shaft mounting structure according to claim 1, wherein one end of the plastic bushing (8a) is provided with a limit flange (8b), the shaft mounting hole (7a) of the planetary gear (7) is a countersunk hole, and the plastic bushing (8a) and the limit flange (8b) are located in the countersunk hole.

3. A planetary gear and eccentric shaft mounting arrangement according to claim 1 or 2, characterized in that the planetary gear (7) meshes with a sun gear and constitutes a planetary gear set, the axis of revolution of the sun gear being parallel to the centre line of the eccentric shaft (4).

4. A mounting structure of a planetary gear and an eccentric shaft according to claim 3, wherein: the sun gear is fixedly installed on a mandrel (9), a middle hole (41) which penetrates through the mandrel in the axial direction is formed in the eccentric shaft (4), the mandrel (9) penetrates through the middle hole (41) of the eccentric shaft (4) and is in clearance fit with the middle hole (41), the axis of the mandrel (9) is overlapped with the rotation axis of the sun gear, power is provided by an external motor, the eccentric shaft (4) rotates around the rotation axis of the eccentric shaft, the planetary gear (7) is driven to revolve around the rotation axis of the mandrel (9) while rotating, and the planetary gear (7) is enabled to do planar motion on the plane.

5. A speed reducer of an automobile seat lifter is provided with a gear box body (1) and a gear box cover (12) which can be combined to form a gear box inner cavity, a transmission mechanism, a planetary gear (7) and an output gear (11) are installed in the gear box inner cavity, the gear box body (1) is provided with a mandrel (9), the output gear (11) is provided with an internal gear (111) and a driving gear (112) used for outputting power, the output gear (11) is rotatably installed on the mandrel (9) and enables the internal gear (111), the driving gear (112) and the mandrel (9) to be coaxial, the planetary gear (7) is meshed with the internal gear (111) and forms a small tooth difference planetary gear pair, the transmission mechanism can transmit the power output by an external motor to the planetary gear (7), and the planetary gear (7) is enabled to be under the action of the transmission mechanism and the internal gear (111), the plane movement is tended to be carried out on a plane vertical to the mandrel (9), and the plane movement comprises rotation and revolution around the axis of the mandrel (9);

a motion decomposition mechanism is further installed in the inner cavity of the gear box, consists of a floating disc (5) and a pin column (6), and is used for decomposing the trend of the planar motion of the planetary gear (7) into the motions in the X direction and the Y direction which are vertical to each other, wherein the X direction and the Y direction are both positioned on the plane; the gearbox casing (1) is provided with an upper mounting cavity (1b) and a lower mounting cavity (1c), a bearing surface (1a) is arranged between the upper mounting cavity (1b) and the lower mounting cavity (1c), the upper mounting cavity (1b) is adapted to the floating disc (5), so that the floating disc (5) is arranged in the upper mounting cavity (1b) and is located on the bearing surface (1a), and the floating disc (5) can slide on the bearing surface (1a) along the Y direction; the floating disc (5) is provided with a guide sliding groove (52) extending along the X direction, the upper end of the pin column (6) is assembled with a pin column mounting hole formed in the planetary gear (7) in an interference fit manner, and the lower end of the pin column (6) is slidably mounted in the guide sliding groove (52) of the floating disc (5);

the transmission mechanism comprises a first transmission mechanism and a second transmission mechanism, and the second transmission mechanism consists of a gear (3), an eccentric shaft (4) and a first bearing (8); the eccentric shaft (4) is composed of an upper eccentric column (42) and a lower eccentric disc (43), the eccentric shaft (4) is provided with a middle hole (41) penetrating through the eccentric column (42) and the eccentric disc (43), the axis of the middle hole (41) is parallel to the axis of the eccentric column (42), and the eccentric distance of the middle hole (41) relative to the eccentric column (42) is equal to the central distance between the planetary gear (7) and the internal gear (111); the gear (3) is injected on the eccentric disc (43) so that the eccentric disc (43) is fixed with the molded gear (3), and the gear (3) is provided with a balance hole (31) for balancing so that the center of mass of the gear (3) is on the rotation axis of the gear; a shaft mounting hole (7a) is formed in the center of the planetary gear (7), a through hole (51) is formed in the center of the floating disc (5), the eccentric column (42) sequentially penetrates through the through hole (51) and the shaft mounting hole (7a), and the first bearing (8) is mounted between the shaft mounting hole (7a) and the eccentric column (42); the gear (3) is arranged in the lower mounting cavity (1c), the mandrel (9) passes through a central hole (41) of the eccentric shaft (4) and is in clearance fit with the central hole (41), and the axis of the mandrel (9) is coincident with the revolution axis of the gear (3); the external motor drives the gear (3) to rotate through the first transmission mechanism;

characterized in that the mounting structure between the planetary gear (7) and the eccentric shaft (4) adopts the mounting structure of the planetary gear and the eccentric shaft as claimed in claim 1 or 2, the first bearing (8) is the plastic bushing (8a) as claimed in claim 1 or 2, and the internal gear (111) is the sun gear as claimed in claim 3 or 4.

6. Decelerator of car seat risers according to claim 5, characterized in that the pin (6) is integrated with the planet gear (7).

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