JPH0512256U - Power seat slide device - Google Patents

Abstract

(57) [Abstract] [Purpose] Assembly work is easy, assembly time can be reduced and assembly cost can be reduced, and the operability of the drive unit is impaired due to the misalignment of the output shaft and the input shaft. To provide a power seat slide device that does not generate noise or noise. [Structure] Even if the output shaft of an electric motor 80 forming the drive unit 30 of a power seat slide device 20 and the shaft center of an input shaft 51 of a worm 50 are slightly deviated from each other, both shafts can rotate integrally. The tip portions of both shafts are connected by a connecting body 70 including an Oldham coupling 71 and an elastic cover 74.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention comprises a rail unit having a rail on the vehicle body side and a rail on the seat side which is fitted to the rail on the vehicle body side so as to be movable in the front-rear direction and supports a seat. The present invention relates to a power seat slide device that can adjust the position of a seat by moving the rail on the seat side forward and backward relative to the rail on the vehicle body via the.

[0002]

[Prior Art]

 A conventional power seat slide device of this type is disclosed in, for example, Japanese Patent Laid-Open No. 63-34252.

That is, the output shaft of the electric motor and the input shaft of the worm are integrally and rotatably connected by a joint which is a rigid body. In this case, the tips of the output shaft and the input shaft are fitted to engage with the grooves at both ends of the joint so that power can be transmitted, and the outer peripheral surfaces of the tips of the output shaft and the input shaft are rigid bodies. It is in contact with the inner wall surface of the joint groove.

[0004]

[Problems to be solved by the device]

 However, in such a conventional power seat slide device, since the tips of the output shaft and the input shaft are fitted inside the grooves at both ends of the joint so that they do not shift when assembled, the output shaft, the joint and the input shaft are It is necessary to align the respective shaft cores to some extent accurately, and it is necessary to increase the accuracy of the mounting of each part and the size of each part itself, which causes a problem of cost increase.

Further, the outer peripheral surfaces of the tips of the output shaft and the input shaft are in contact with the inner wall surface of the groove of the joint, which is a rigid body, and the range in which the joint can absorb the deviation between the shaft cores is narrow, There was a problem that operability was impaired and abnormal noise was likely to occur.

The present invention has been made by paying attention to such conventional problems, and it is easy to assemble each component, the assembly cost can be reduced, and the operability is impaired. It is an object of the present invention to provide a power seat slide device that is difficult to produce and does not cause abnormal noise.

[0007]

[Means for Solving the Problems]

 The gist to achieve such an object is to provide a rail unit having a rail on the vehicle body side and a rail on the seat side which is fitted to the rail on the vehicle body side so as to be movable back and forth and supports a seat. In a power seat slide device that includes an electric motor and can move the seat-side rail forward and backward relative to the vehicle body-side rail via a drive unit, the drive unit includes a vehicle-side rail and a seat-side rail. A screw member rotatably supported on one of the rails, a nut member screwed on the screw member so as to be rotatable relative to the other of the vehicle-side rail and the seat-side rail, and the electric motor. A worm that rotates, a connecting body that integrally rotatably connects the output shaft of the electric motor and the input shaft of the worm, and rotatably meshes with the worm. An Oldham coupling having a screw member and a worm wheel that rotates integrally with the screw member, wherein the connecting body connects the tip ends of the output shaft and the input shaft to each other so as to be able to transmit a dynamic force regardless of displacement of both shaft cores. And an elastic cover externally fitted over the Oldham joint and the tip portions of the both shafts in a state where the Oldham joint is slidable with respect to the tip portions of the both shafts. It exists in the power seat slide device.

[0008]

[Action]

 When assembling the power seat slide device, the shafts of the output shaft of the electric motor and the input shaft of the worm may be slightly misaligned due to variations in the mounting accuracy of the parts and the dimensions of the parts. Can be rotatably connected together. As a result, it is not necessary to align the output shaft and the input shaft with each other accurately, and the assembly work is facilitated, and the work time is shortened, so that the assembly cost can be reduced.

In order to connect the output shaft of the electric motor and the input shaft of the worm, first, an elastic cover forming a connecting body is externally fitted to either one of the shafts, and at the same time, Oldham forming the connecting body is also fitted. Insert the joint into the elastic cover and fit one end of the Oldham joint to the tip of the shaft. Next, the tip end of the other shaft is opposed to the one shaft so as to align the shaft cores, and then fitted inside the elastic cover and at the other end side of the Oldham coupling inside the elastic cover.

The Oldham's joint of the connected body can smoothly transmit the rotational force from the output shaft to the input shaft even when the output shaft and the input shaft are slightly in parallel with each other. As a result, the displacement of the output shaft and the input shaft does not impair the operability of the drive unit or cause abnormal noise.

The elastic cover of the coupling body facilitates the work of interposing the Oldham coupling between the output shaft and the input shaft during assembly, and the elastic cover after assembly is designed to allow the Oldham coupling to transmit power. The Oldham joint is slidably fitted over the tip portions of both shafts, and is fitted over the tip portions of the shafts. Prevents dust from entering both sides.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention. As shown in FIG. 4, a seat 10a is installed on the vehicle body floor 10 via a power seat slide device 20a so that the front and rear positions thereof can be adjusted.

The power seat slide device 20a has a pair of rail units 20, 20 which are arranged below both side portions of the seat 10a and extend in the front-rear direction. The rail unit 20 includes a vehicle body-side rail 21 fixedly mounted on the vehicle body floor 10 via leg members 12 and 13, and a seat-side rail 22 that movably fits to the vehicle-body-side rail 21 to support a seat. And consists of.

As shown in FIGS. 2 and 3, the rail 21 on the vehicle body side is formed in a groove-shaped cross section and has a bottom surface portion 23 and both side wall portions 24, 24. Similarly, the seat-side rail 22 is formed in a groove-shaped cross section, and has a ceiling portion 25 and side wall portions 26, 26.

The opening of the rail 21 on the vehicle body side and the opening of the rail 22 on the seat side are combined, and the bottom portion 23 and the side wall portions 24, 24 of the rail 21 on the vehicle body side and the ceiling portion 25 of the rail 22 on the seat side are combined. A space 20b is formed by being surrounded by the side wall portions 26, 26.

The drive unit 30 is inserted in the space 20 b of the rail unit 20, and the drive unit 30 has a screw member 31 extending in the front-rear direction and a nut member 32 screwed to the screw member 31. ing. The nut member 32 is bolted to the bottom surface portion 23 of the rail 21 on the vehicle body side so that the nut member 32 cannot move back and forth and cannot rotate.

The front end of the ceiling portion 25 of the seat-side rail 22 is raised to form a storage chamber 20c, and the storage chamber 20c stores a gear case 40 that constitutes the drive unit 30. Inside the gear case 40, as shown in FIG. 3, an accommodation hole 41 for accommodating the worm 50 is formed.

Bearing members 42, 42 for rotatably supporting the worm 50 are attached to both ends of the housing hole 41 of the gear case 40. A pair of fixed brackets 60, 60 holding the gear case 40 are bolted to the ceiling portion 25 of the seat-side rail 22 that constitutes the storage chamber 20c.

An electric motor 80, which is a power source, is attached to a side wall portion 26 of the rail unit 20 facing the inner side of the seat-side rail 22 via a support bracket 84. An attachment hole 26a is formed in the side wall portion 26, and a tubular portion 80c provided at the base end portion 80a of the electric motor 80 is fitted in the attachment hole 26a.

As shown in FIGS. 2 and 3, a proximal output shaft 81 is provided inside the proximal end portion 80a of the electric motor 80 so as to extend outward, and a cylindrical portion of the proximal end portion 80a is provided. The tip end portion 82 of the base end output shaft 81 is seen inside 80c.

A long groove 82 a passing through the shaft core is formed in the tip portion 82 of the base output shaft 81. The long groove 82a is open to the end surface and the outer peripheral surface of the distal end portion 82 of the proximal output shaft 81. Similarly, a long groove 52a is also formed in the tip portion 52 of the input shaft 51 of the worm 50 that projects outward from the bearing member 42 of the gear case 40.

As shown in FIGS. 1 and 2, the base end output shaft 81 of the electric motor 80 and the input shaft 51 of the worm 50 are integrally and rotatably connected via a connecting body 70. The connecting body 70 includes an Oldham coupling 71 that connects the distal ends 52 and 82 of the input shaft 51 and the proximal output shaft 81 to each other so that power can be transmitted regardless of the displacement of the shaft cores, and the Oldham coupling 71 and the distal ends of the shafts. The elastic cover 74 is fitted over the parts 52 and 82.

The Oldham coupling 71 of the connecting body 70 has a fitting projection 72 extending in the longitudinal direction through the central portion on one end face side of the disc-shaped main body, and the other end face side of the main body is the same. A fitting protrusion 73 extending in the longitudinal direction through the center portion is provided. The fitting protrusions 72, 73 on both sides of the Oldham's joint 71 are provided so as to be orthogonal to each other.

The fitting protrusion 72 on the one end surface side of the Oldham coupling 71 is slidably fitted in the long groove 52 a of the input shaft 51 of the worm 50, while the fitting protrusion 72 on the other end surface side of the Oldham coupling 71 is fitted. The protrusion 73 is slidably fitted in the long groove 82 a of the base output shaft 81 of the electric motor 80.

The elastic cover 74 of the connecting body 70 is formed of rubber into a cylindrical shape, and the Oldham coupling 71 is slidable with respect to the tip portions 52 and 82 of both shafts. And is fitted over the tip portions 52 and 82 of both shafts. A tip output shaft 83 extends from the tip portion 80b of the electric motor 80 to the other rail unit 20 side.

A rear end portion of the screw member 31 is rotatably supported by a ceiling portion 25 of the seat-side rail 22 via a bearing member 33. The front end portion of the screw member 31 is inserted into the gear case 40, and is rotatably supported by the ceiling portion 25 of the seat-side rail 22 via the gear case 40 and the fixing brackets 60, 60.

On the front end side of the screw member 31, there is fitted a stopper member 34 that comes into contact with the front end surface of the nut member 32 and restricts the rearward moving end of the screw member 31. Similarly, on the rear end side of the screw member 31, a stopper member 34 that is in contact with the rear end surface of the nut member 32 and restricts the forward moving end of the screw member 31 is fitted.

A worm 50 is rotatably mounted in the gear case 40, and a worm wheel 53 that meshes with the worm 50 is also mounted in the gear case 40. The worm wheel 53 is integrally rotatably fitted to the front end portion of the screw member 31 inserted into the gear case 40.

Next, the operation will be described. As shown in FIG. 2, when the power seat slide device 20 is assembled, the side wall portion 26 of the rail 22 on the seat side is affected by the mounting accuracy of each component such as the gear case 40 and the electric motor 80 and the dimensional variation of each component. Even if the shaft ends of the base end output shaft 81 of the electric motor 80 and the input shaft 51 of the worm 50 in the gear case 40 are slightly deviated from each other, the connecting body 70 integrally connects the shafts 51, 81. Can be rotatably connected.

Accordingly, when the electric motor 80 or the like is mounted, it is not necessary to accurately align the base end output shaft 81 of the electric motor 80 and the input shaft 51 of the worm 50 with each other, and the power seat slide device 20 Since the assembling work becomes easy and the assembling time is shortened, the assembling cost can be reduced.

More specifically, as shown in FIG. 1, in order to connect the base end output shaft 81 of the electric motor 80 and the input shaft 51 of the worm 50 so that power can be transmitted, first, the rail on the seat side is connected. An elastic cover 74, which constitutes the connecting body 70, is externally fitted to the input shaft 51 of the worm 50 in the gear case 40 fixed to the ceiling portion 25 of 22. Before and after, the Oldham coupling 71 is inserted into the elastic cover 74, and the fitting projection 72 on the one end face side of the Oldham coupling 71 is fitted into the long groove 52a of the tip portion 52 of the input shaft 51. The connecting body 70 is put into the storage chamber 20c from the mounting hole 26a of the side wall portion 26 of the seat-side rail 22.

Next, the electric motor 80 is attached to the side wall portion 26 of the seat-side rail 22 via the support bracket 84. At this time, the base end output shaft 81 of the electric motor 80 is aligned with the shaft center of the input shaft 51 of the worm 50 so that the distal end portion 82 of the base end output shaft 81 is fitted into the elastic cover 74. At the same time, the elongated hole 82a of the tip portion 82 is fitted into the fitting projection 73 on the other end surface side of the Oldham's joint 71.

In the Oldham coupling 71 of the connecting body 70, even when the axes of the input shaft 51 and the base end output shaft 81 are slightly parallel to each other, the elastic cover 74 that covers the shafts 51 and 81 can be deformed. In addition, the Oldham coupling 71 in the elastic cover 74 can smoothly transmit the rotational force from the proximal output shaft 81 to the input shaft 51.

As a result, it is not necessary to accurately align the respective axial cores of the proximal output shaft 81 and the input shaft 51, and it is possible to drive due to the displacement of the axial axes of the proximal output shaft 81 and the input shaft 51. The operability of the portion 30 is not impaired and no abnormal noise is generated.

The elastic cover 74 of the connecting body 70 facilitates the work of interposing the Oldham coupling 71 between the base end output shaft 81 and the input shaft 51 during assembly, and the elastic cover 74 after assembly is The Oldham joint 71 is slidable with respect to the tip portions 52, 82 of the shafts 51, 81 so as to transmit power, and extends over the Oldham joint 71 and the tip portions 52, 82 of the shafts 51, 81. The external fitting prevents dust and dirt from entering the both end surfaces of the Oldham coupling 71.

As shown in FIG. 3, the rotation torque of the base end output shaft 81 of the electric motor 80 is transmitted to the input shaft 51 of the worm 50 via the connecting body 70, and the worm 50 in the gear case 40 and the worm 50. The direction of rotation is changed by the wheel 53 to rotate the screw member 31.

Since the nut member 32 is non-rotatably and immovably locked to the rail 21 on the vehicle body side, when the screw member 31 rotates, the screw member 31 is gradually fed in the front-rear direction by the nut member 32. .. As a result, the seat-side rail 22 moves in the front-rear direction with respect to the vehicle-body-side rail 21, and the seat 10a moves in the front-rear direction with respect to the vehicle body floor 10 so that the front-rear position of the seat 10a can be adjusted. ..

[0038]

[Effect of the device]

 According to the power seat slide device of the present invention, when the device is assembled, even if the shaft centers of the output shaft of the electric motor and the input shaft of the worm are slightly deviated from each other, the assembly formed by the Oldham coupling and the elastic cover is used. Since both shafts can be connected to each other so that they can rotate together, it is not necessary to align the output shaft and the input shaft with each other accurately, which simplifies the assembly work and shortens the work time. The cost can be reduced, and the operability of the drive unit is not impaired due to the misalignment of the output shaft and the input shaft, and abnormal noise can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing a connecting body of a power seat slide device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a power seat slide device according to an embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a rail unit of a power seat slide device according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a seat equipped with a power seat slide device according to an embodiment of the present invention.

[Explanation of symbols]

 10a ... Seat 20 ... Power seat slide device 20a ... Rail unit 21 ... Vehicle side rail 22 ... Seat side rail 30 ... Driving section 31 ... Screw member 32 ... Nut member 50 ... Warm 51 ... Input shaft 70 ... Coupling 71 ... Oldham coupling 74 ... Elastic cover 80 ... Electric motor 81 ... Base end output shaft

Claims (1)

[Scope of utility model registration request] 1. A rail unit having a rail on the vehicle body side and a rail on the seat side for supporting the seat by being fitted to the rail on the vehicle body side so as to be movable back and forth, and a drive unit is provided by an electric motor. In the power seat slide device capable of moving the seat-side rail forward and backward relative to the vehicle-body-side rail via the drive unit, the drive unit is rotatably supported by one of the vehicle-body-side rail and the seat-side rail. Screw member, a nut member that is rotatably screwed relative to the screw member and is supported by the other of the vehicle body side rail and the seat side rail, a worm rotated by the electric motor, and the electric motor Of the output shaft of the worm and the input shaft of the worm so as to rotate integrally with each other, and a wheel that rotatably meshes with the worm and rotates integrally with the screw member. An ohm wheel, wherein the connecting body connects an end of each of the output shaft and the input shaft so that power can be transmitted regardless of displacement of both shaft cores; A power seat slide device comprising: the Oldham's joint and an elastic cover fitted over the tip portions of the both shafts in a slidable manner with respect to the tip portions.