JPH053022U - Sheet sensor - Google Patents

Abstract

(57) [Summary] [Purpose] The reed switch detection accuracy is kept high by preventing the sensor shaft from swinging. [Structure] The housing 2 is provided with a bearing 6 that rotatably supports the end portion of the lead screw 10 on the lead screw connecting portion 4a2 side of the sensor shaft 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seat sensor used for detecting rotation of a seat motor in a seat slide device used for automatically operating a seat of an automobile, for example.

[0002]

[Prior Art]

 FIG. 2 shows an example of a seat sensor used to detect the rotation of a seat motor in a seat slide device. In this seat slide device, memory control is performed by installing a seat sensor and seat sensor is not installed. It has the same gearbox as the one without memory control.

The sheet sensor 50 shown in the drawing is attached to a gear box 61 arranged on the end side of a lead screw 60 having a length dimension substantially corresponding to the width dimension of a sheet (not shown). , A sensor shaft 52, a sensor magnet 53, and a reed switch 54.

A sensor connecting portion 60b having a male screw portion 60a and a flat surface 60b1 is provided near the end of the lead screw 60.

The gear box 61 also rotatably supports the tip end side of a cable 63 whose base end side is connected to a motor shaft (not shown) included in the seat motor 62. A worm 63a is formed in the gear box 61.

The gear box 61 is provided with a communication hole 61c that communicates from the sensor mounting portion 61a on the left side in the drawing to the lead screw connecting portion 61b on the right side in the drawing. In the hole 61c, a bearing 64 is mounted on the side of the lead screw connecting portion 61b, and a helical gear 65 is rotatably housed in substantially the center thereof, and the helical gear 65 meshes with the worm 63a to form a worm. It receives the rotation of 63a.

Further, an insertion hole 65a having a flat surface 65a1 is formed in the center of the helical gear 65, and almost half of the flat surface 65a1 on the right side in the drawing is an insertion portion 65a2 for the lead screw 60. And approximately half on the left side in the drawing is an insertion portion 65a3 for the sensor shaft 52.

Here, in a state where the helical gear connecting portion 60 b of the lead screw 60 is inserted into the insertion hole 65 a of the helical gear 65 from the right side of the gear box 61 in the drawing through the bearing 64, The lead screw 60 is fixed to the rotating side of the bearing 64 by screwing the nut 66 into the male screw portion 60a, and the helical gear connecting portion 60b leaves the insertion portion 65a3 for the sensor shaft 52 of the helical gear 65 and the lead screw 60a3. Since the flat surface 60b1 of the helical gear coupling portion 60b is engaged with the flat surface 64a1 of the lead screw insertion hole 64a by being inserted into the insertion portion 65a2 for 60, the helical gear 65 is integrally connected to the lead screw 60. The seat motor 62 rotates to The gear 63 is decelerated by the helical gear 65 via the worm 63a of the rod 63 and transmitted to the lead screw 60, and the rotation of the lead screw 60 moves the seat fixed to the nut member (not shown) meshing with the lead screw 60.

On the other hand, the sensor shaft 52 of the seat sensor 50 is connected to the insertion portion 65a3 of the helical gear 65 for the sensor shaft 52 in an engaged state.

The sensor shaft 52 has a long, small-diameter shaft shape from the left side to the right side in the drawing, and is supported by a shaft support hole 51 a provided at substantially the center of the housing 51. Rotate.

Further, the right side of the sensor shaft 52 in the drawing protrudes from the shaft support hole 51a to the right side of the drawing, and a lead screw connecting portion 52a having a flat surface 52a1 is formed near the protruding tip. A sensor magnet connecting portion 52b having a flat surface 52b1 is formed near the left end of the sensor shaft 52 in the figure, and the lead screw connecting portion 52a is connected to the sensor shaft of the helical gear 65. The flat surface 52a1 of the sensor shaft 52 is engaged with the insertion portion 65a3 for the sensor shaft 52 at the flat surface 65a1 of the insertion hole 65a of the helical gear 65 by being inserted into the insertion portion 65a3 for 52.

The sensor magnet 53 of the seat sensor 50 includes a ring portion 53a having an annular outer shape and a holder 53b for rotating the ring portion 53a concentrically with respect to the sensor shaft 52. Become.

A sensor shaft insertion hole 53b1 having an inner diameter dimension slightly larger than the outer diameter dimension of the sensor shaft 52 is provided in the center of the holder 53b, and the sensor shaft insertion hole 53b1 has a left side in the drawing. A flat surface 53b2 is formed near the end.

Further, by inserting the sensor magnet connecting portion 52b of the sensor shaft 52 into the sensor shaft inserting hole 53b1 of the sensor magnet 53, the flat surface 53b2 formed in the sensor shaft inserting hole 53b1 is a flat surface of the sensor magnet connecting portion 52b. The ring portion 52a rotates concentrically with the sensor shaft 52 while engaging with the surface 52b1 and connecting the sensor magnet 53 to the sensor shaft 52.

Further, on the left side of the shaft support hole 51a of the housing 51 in the figure, a magnet storage portion 51a1 having an inner diameter larger than the outer diameter of the sensor magnet 53 is formed. A reed switch 54 is mounted on the upper side of the magnet housing 51a1 in the figure, and a cap 56 is fitted to the end of the sensor shaft 52 on the side of the sensor magnet coupling 52b.

The reed switch 54 is turned on / off by a magnetic flux generated by the rotation of the sensor magnet 53, and is provided with external connection wirings 54a and 54b exposed to the outside. By transmitting the pulse signal by the ON / OFF switching to the controller connected to the connection wirings 54a and 54b, the rotation speed of the sensor magnet 53 is detected by the controller.

Here, when the sheet sensor 50 is assembled to the gear box 61, the sensor shaft 52 is supported by the shaft support hole 51 a of the housing 51 to which the lead switch 54 is fixed, and the holder 53 b of the sensor magnet 53 is mounted. The provided sensor shaft insertion hole 53b1 is inserted into the sensor magnet connecting portion 52b of the sensor shaft 52, and the lead screw connecting portion 52a of the sensor shaft 52 protruding from the shaft supporting hole 51a is inserted into the sensor gear 52 of the helical gear 65. The flat surface 52a1 formed on the lead screw connecting portion 52a of the sensor shaft 52 by being inserted into the 65a3 engages with the flat surface 65a1 formed in the insertion hole 65a of the helical gear 65.

Then, when the housing 51 is aligned with the sensor mounting portion 61 a of the gear box 61, the housing 51 is fixed to the gear box 61 by screwing a bolt 55 into the gear box 61 through the housing 51.

As a result, the amount of movement of the sheet moved by the rotation of the lead screw 60 under the power of the sheet motor 62 is counted by the controller based on the number of rotations of the lead screw 60 and stored, and the position of the sheet is stored. At the time of restoration, the seat motor is operated for a predetermined time based on the stored number of counts.

Further, when the seat sensor 50 is not assembled without performing the memory control, the end cap 57 shown by a virtual line in the drawing is fitted to the sensor mounting portion 61a of the gear box 61, thereby The left side in the figure of the communication hole 61c of 61 is closed.

However, in the above-described conventional seat sensor 50, the lead screw connecting portion 52a of the sensor shaft 52 projects from the shaft supporting hole 51a in a state of being supported by the shaft supporting hole 51a of the housing 51. Since the lead screw connecting portion 52a of the sensor shaft 52 in the projected state is inserted into the insertion hole 65a of the helical gear 65, the sensor shaft 52 is connected to the lead screw 60 via the helical gear 65. It is hard to say that the long lead screw 60 is liable to be shaken on the side of the helical gear connecting portion 60b which is the tip end side while being supported by the bearing 64 mounted on the gear box 51. The rotation of the screw 60 is received by the sensor shaft 52. When the rotation of the sensor magnet 53 fixed to the sensor shaft 52 is detected by the reed switch 54, the rotation is detected by the sensor magnet 53 whose center of rotation is deviated due to the shake, so that the detection accuracy of the reed switch 54 is reduced. There is a drawback that it may decrease.

[0022]

[Problems to be solved by the device]

 The problem to be solved is that if the sensor shaft shakes, the detection accuracy of the lead switch may decrease.

[0023]

[Means for Solving the Problems]

 In the seat sensor according to the present invention, in order to prevent the sensor shaft from swinging, the housing is provided with a bearing for rotatably supporting the end portion of the lead screw on the lead screw connecting portion side of the sensor shaft. The most important feature is that the objective of keeping the reed switch detection accuracy at a high level has been achieved with a small change in housing.

[0024]

[Action]

 Since the seat sensor according to the present invention rotatably supports the end portion of the lead screw on the lead screw connecting portion side of the sensor shaft by the bearing provided in the housing, even if there is runout at the end portion of the lead screw, The runout is suppressed by the bearing so that the center of rotation of the sensor shaft is not displaced, and the sensor magnet can smoothly rotate while the sensor shaft has a predetermined center of rotation.

[0025]

【Example】

 A seat sensor according to an embodiment of the present invention will be described below with reference to FIG.

In the illustrated seat sensor, the gearbox of the seat slide device is the same for those that perform memory control by mounting the seat sensor and those that do not perform memory control without mounting the seat sensor.

The illustrated sheet sensor 1 is to be mounted on a gear box 11 disposed on the end side of the lead screw 10 having a length dimension that substantially matches the width dimension of a sheet (not shown). 2, a sensor shaft 4 in which a sensor magnet 3 is integrally provided, a reed switch 5, and a lead screw bearing 6 on the sensor side.

Around the end of the lead screw 10 shown in the drawing, from the right side to the left side in FIG. 1, a gear box side bearing support portion 10a, a male screw portion 10b, and a flat for engaging a helical gear are provided. A helical gear insertion portion 10b having a surface 10b1 and a sensor coupling portion 10c having a protrusion-shaped engaging protrusion 10c1 along the axial direction of the lead screw 10 are provided.

The gear box 11 also rotatably supports the tip end side of a cable 13 whose base end side is connected to a motor shaft (not shown) provided in the seat motor 12, and which is rotatably supported at the tip end side of the cable 13. Has a worm 13 a formed in the gear box 11.

The gear box 11 is provided with a communication hole 11c that communicates from the sensor mounting portion 11a on the left side in the drawing to the lead screw connecting portion 11b on the right side in the drawing. In the hole 11c, the lead screw bearing portion 14 on the gear box side is mounted on the lead screw connecting portion 11b side, and the helical gear 15 is rotatable in a position corresponding to the worm 13a substantially in the center. It has been housed, and the helical gear 15 meshes with the worm 13a to receive the rotation of the worm 13a.

Further, an insertion hole 15a having a flat surface 15a 1 partially formed is provided at substantially the center of the helical gear 15, and the helical gear insertion portion 10b of the lead screw 10 is inserted into the insertion hole 15a. It has become.

Here, the sensor connection of the lead screw 10 is made by passing the end portion of the lead screw 10 through the lead screw bearing 14 on the gear box side attached to the gear box 11 and the insertion hole 15 a of the helical gear 15. With the portion 10c protruding to the left side of the helical gear 15 in FIG. 1, the flat surface 10b1 formed on the helical gear insertion portion 10b of the lead screw 10 becomes the flat surface 15a1 formed on the insertion hole 15a of the helical gear 15. Engage.

In this state, the nut 16 passed through the helical gear insertion portion 10b of the lead screw 10 is screwed into the male screw portion 10b of the lead screw 10 to attach the lead screw 10 to the gear box 11. By fixing the lead screw 10 to the rotation side of the lead screw bearing 14, the lead screw 10 is supported in a state in which the bearing support portion 10a of the lead screw 10 is supported by the gear box side lead screw bearing 14 mounted on the gear box 11. It is supported on the gear box 11 side.

As a result, the rotation of the seat motor 12 is reduced by the helical gear 15 via the worm 13a of the cable 13 and transmitted to the lead screw 10, and the rotation of the lead screen 10 meshes with the lead screw 10 (not shown). Move the sheet fixed to the material.

On the other hand, the sensor shaft 4 of the sheet sensor 1 is connected to the protruding engaging protrusion 10c1 formed on the sensor connecting portion 10c of the lead screw 10 in an engaged state.

The sensor shaft 4 includes a shaft portion 4a having a short and small diameter shaft shape from the left side to the right side in the figure, and a ring formed integrally with the shaft portion 4a on the outer peripheral side of the shaft portion 4a. The sensor magnet 3 has a shape, and has a frame-shaped appearance. In this case, the sensor magnet 3 has a ring shape, but it may be provided on a part of the shaft portion 4a.

The sensor shaft 4 has a shaft support hole 2a provided substantially in the center of the housing 2, and a central portion of the sensor shaft 4 is supported by the shaft cap 7 of the shaft cap 7 fitted near the left end of the housing 2 in FIG. The shaft supporting hole 7a provided in the center rotates while the left side in FIG. 1 is supported.

Further, the engaging protrusion 10c1 formed on the sensor connecting portion 10c of the lead screw 10 is provided at the center of the sensor magnet 3 of the sensor shaft 4 on the right side in FIG. 1 on the one end side of the shaft portion 4a. There is provided a lead screw connecting portion 4a2 having an engaging recess 4a1 formed in a concave shape slightly larger than the projecting outer dimension, and the engaging recess 4a1 engages with the engaging protrusion 10c1 of the lead screw 10. Removably engage.

The right side of the lead screw connecting portion 4a2 of the shaft portion 4a in FIG. 1 is located substantially at the center of the assembly portion 2b of the housing 2 to the gear box 11, which is the right end side in FIG. Is provided with a bearing hole 2c communicating with the shaft support hole 2a. The sensor side lead screw bearing 6 has an inner diameter side rotation center that matches the rotation center of the shaft portion 4a in the bearing hole 2c. Is attached.

Further, the inner diameter dimension of the lead screw bearing 6 on the sensor side is slightly larger than the outer diameter dimension of the sensor connecting portion 10c of the lead screw 10, so that the insertion hole 15a of the helical gear 15 is used. The sensor connecting portion 10c of the lead screw 10 is rotatably supported in a state where the protruding sensor connecting portion 10c of the lead screw 10 is aligned with the rotation center of the sensor shaft 4.

Further, on the left side of the shaft support hole 2a of the housing 2 in the drawing, a magnet storage portion 2d formed as a cylindrical opening having an inner diameter larger than the outer diameter of the sensor magnet 4b. Is formed, and the reed switch 5 is attached to the upper side of the magnet housing portion 2d in the figure.

The reed switch 5 is for switching on / off by the magnetic flux generated by the rotation of the sensor magnet 3, and is used for the controller connected to the external connection wirings 5a and 5b exposed to the outside. The controller detects the number of rotations of the sensor magnet 3 by transmitting a pulse signal for switching on / off.

Here, when the sheet sensor 1 is assembled to the gear box 11, the sensor shaft 4 is supported by the shaft support hole 2 a of the housing 2 to which the lead switch 5 is attached and the shaft support hole 7 a of the shaft cap 7. The sensor coupling portion 10c of the lead screw 10 protruding from the helical gear 15 in the gear box 11 is inserted into the sensor-side lead screw bearing 6 mounted on the housing, and the mounting portion 2b of the housing 2 is attached to the gear casing 11. Align it with the sensor mounting portion 11a.

The sensor connecting portion 10c of the lead screw 10 protruding from the helical gear 15 in the gear box 11 is inserted into the sensor side lead screw bearing 6, and the assembly portion 2b of the housing 2 is attached to the sensor of the gear casing 11. By engaging with the mounting portion 11a, the engagement concave portion 4a1 of the sensor shaft 4 engages with the engagement convex portion 10c1 formed on the sensor connecting portion 10c of the lead screw 10.

Then, the housing 2 is fixed to the gear box 11 by screwing the bolt 8 into the gear box 11 through the housing 2, and the rotation center of the sensor connecting portion 10 c of the lead screw 10 becomes the rotation center of the sensor shaft 4. The sensor shaft 4 is integrally connected to the lead screw 10 in a matched state.

As a result, the amount of movement of the sheet moved by the rotation of the lead screw 10 under the power of the sheet motor 12 is read by the rotation of the sensor magnet 3 of the sensor shaft 4 integrally connected to the lead screw 10. The pulse signal output by the switch 5 is counted and stored as rotation speed data of the seat motor 13 by the controller, and when the seat position is restored, the seat motor is operated for a predetermined time based on the stored count number. I am trying.

Further, when the seat sensor 1 is not assembled, an end cap 17 indicated by a virtual line in the drawing is fitted to the sensor mounting portion 11a of the gear box 11.

[0048]

[Effect of the device]

 As described above, since the seat sensor according to the present invention has the above-described configuration, the bearing provided in the housing rotatably supports the end portion of the lead screw on the lead screw connecting portion side of the sensor shaft. Even if there is runout at the end of the lead screw, the runout is suppressed by the bearings so that the center of rotation of the sensor shaft does not shift, and the sensor magnet rotates smoothly while the sensor shaft has a certain center of rotation. Therefore, it has an excellent effect of maintaining a high detection accuracy of the reed switch.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a seat sensor according to the present invention assembled to a gear box.

FIG. 2 is a vertical cross-sectional side view showing a state in which a conventional seat sensor is assembled to a gear box.

[Explanation of symbols]

 1 sheet sensor 2 housing 3 sensor magnet 4 sensor shaft 4a2 lead screw connecting part 5 reed switch 6 (bearing) sensor side lead screw bearing 10 lead screw 12 seat motor

Claims (1)

[Claims for utility model registration] [Claim 1] A lead screw connecting portion that engages with a lead screw that is rotated by the driving force of a seat motor in a disengageable manner is formed, and a sensor magnet is integrally provided. A sensor shaft, a reed switch that outputs a pulse by rotation of the sensor magnet, and a housing that rotatably supports the sensor shaft, houses the reed switch, and is detachably assembled to a gear box that supports the lead screw. And a bearing for rotatably supporting an end portion of the lead screw on the lead screw connecting portion side of the sensor shaft.