JPH0231895Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a motor having a potentiometer for detecting rotational position.

"Prior Art and its Problems" This type of motor is used in the vehicle field, for example, to drive a seat slide device and to detect its movement position. FIG. 5 is a conceptual diagram showing an example of this, in which a pair of seat tracks 11 are provided on the left and right.
are the lower rails 1 fixed to the vehicle floor, respectively.
2 and can slide on this lower rail 12,
It consists of an upper rail 13 fixed to the seat S. A rack 14 is integrally fixed to one of the upper rails 13, and a motor 20 having a pinion 21 that meshes with the rack 14 is attached to the lower rail 12 or a member related thereto.
is fixed. Therefore, when the pinion 21 is rotated by the motor 20, the upper rail 13,
In other words, the seat S moves back and forth.

The motor 20, as shown in FIGS. 6 and 7,
Worm 2 rotationally driven by drive device 22
3 is meshed with the worm wheel 24, and the output shaft 25 of the shaft of this worm wheel 24
The pinion 21 is fixed to the tip.

A potentiometer 30 is located on the opposite side of the wormwheel 24 from the pinion 21 . This potentiometer 30 detects the amount of rotation of the worm wheel 24 to control the upper rail 13.
It is used to detect the position of the driver, and is used, for example, to store the optimal seat position depending on the driver.
This potentiometer 30 has a rotating shaft 31 perpendicular to the axis of the worm wheel 24, and a bevel gear 32 is fixed to the tip of the rotating shaft 31. On the other hand, the worm wheel 24 of the motor 20 has
A bevel gear 26 that meshes with this bevel gear 32 is fixed.

As is clear from FIG. 7, this bevel gear 26 is integrally provided with a disc 27 that is separate from the worm wheel 24, and this disc 27 has an eccentric position on the opposite side of the bevel gear 26. , multiple fixing pins 2
8 stands out. This fixing pin 28 is fitted into a fixing hole 29 made in the wormwheel 24, so that the bevel gear 26 rotates together with the wormwheel 24.

However, in this conventional device, the bevel gear 26 is fixed to the worm wheel 24 via the disc 27, the fixing pin 28, and the fixing hole 29, so the number of parts is large, and the processability, assemblability, weight, and cost are reduced. There were problems on both sides. Also, bevel gear 26
Since the disc 27 is interposed between the worm wheel 24 and the worm wheel 24, precise machining is required to improve the axial precision of both.

``Purpose of the invention'' This invention solves the problems of the conventional motors mentioned above, has a simple structure, has a small number of parts, is lightweight,
and to obtain a motor that can reduce costs.

"Summary of the invention" In the motor of the invention, the output shaft, which was conventionally provided on one side of the rotating body, is extended and protruded from the rotating body toward the potentiometer side, and this protrusion has a non-circular cross-section. On the other hand, the bevel gear on the rotating body side that meshes with the bevel gear of the potentiometer is characterized by forming a non-circular cross-section shaft hole that fits into the non-circular cross-section portion. According to this configuration, a motor having a potentiometer can be constructed without requiring any other special parts by simply forming a non-circular cross-section portion and a non-circular cross-section shaft hole on the output shaft and bevel gear. .

``Embodiments of the invention'' The invention will be described below with reference to illustrated embodiments. 1 to 4 show an embodiment of the present invention, and the same elements as those of the conventional device are given the same reference numerals. Reference numeral 40 denotes a worm foil that engages with the worm 23 that is rotationally driven by the drive device 22, and is located inside the casing 41. Inside the casing 41, the drive device 22 and the worm 23 are installed.
etc. are stored at the same time. Reference numeral 42 denotes an output shaft that rotates together with the worm wheel 40, and the pinion 21 is fixed to one end of the output shaft 42 projecting from the casing 41. At the end of the output shaft 42 opposite to the pinion 21, two oval cross-sectional sections 43 and 44 are formed which are spaced a certain distance apart in the axial direction. On the other hand, the worm foil 40 has an oval-shaped shaft hole 45, and the oval-shaped shaft hole 45 fits into the oval-shaped cross-section portion 44, and the worm foil 40
and the output shaft 42 are integrated in the rotational direction.

Another oval cross section 43 of the output shaft 42 is
It protrudes from the worm wheel 40 to the opposite side of the pinion 21. As shown in FIG. 4, the bevel gear 46 to be fixed to the oval cross section 43 is formed with an oval shaft hole 47 whose shape matches the oval cross section 43. 47 into the oval-shaped cross section 43, the bevel gear 46 connects to the output shaft 42.
and are integrated in the rotational direction.

Potentiometer 30 is supported between covers 50 and 51 of casing 41. That is,
A substantially circular cover 50 attached to the casing 41
A meter support recess 53 is formed radially from the square hole 52 in the center, and the potentiometer 30 housed in the meter support recess 53 is
The top surface is held down by the cover 51.
The cover 51 includes a closing portion 51 that closes the upper surface of the square hole 52.
a, and a clamping portion 51b that abuts the upper surface of the potentiometer 30, and is fixed to the cover 50 by a fixing screw 54. and potentiometer 30
A bevel gear 32 fixed to a rotating shaft 31 meshes with the bevel gear 46. 55 is a reinforcing rib formed on the cover 50.

In the present motor having the above configuration, in order to fix the bevel gear 46 to the output shaft 42, the output shaft 42 is formed with an oval-shaped cross section 43, and the bevel gear 46 is formed with an oval-shaped shaft hole 47. Intermediate members such as the disk 27 and fixing pin 28 in the conventional device are not required. Therefore, the number of parts can be reduced.
The bevel gear 46 simply has its oval shaft hole 47.
Just by fitting it into the oval shaped section 43, the output shaft 42
Easy to assemble as it rotates together with the Further, since no other parts are interposed between the worm wheel 40 and the bevel gear 46, the axial accuracy of the worm wheel 40 and the bevel gear 46 can be easily improved. Note that, after the bevel gear 46 is fitted into the oval cross-section portion 43, it can be fixed to prevent it from coming off using a fixing screw, an adhesive, or the like.

Of course, this motor is similar to conventional motors, and when the drive device 22 is driven, the worm wheel 40, output shaft 42, pinion 21, and bevel gear 46 rotate together. Therefore, the pinion 21 can drive a driven object, such as the upper rail 13, and at the same time, the bevel gear 46 that rotates together with the pinion 21 rotates the potentiometer 30 to obtain information regarding the rotational position of the pinion 21. be able to. This information provided to the potentiometer 30 is more accurate than conventional devices because the axial accuracy of the bevel gear 46 and output shaft 42 can be increased.

Oval-shaped cross-section parts 43, 44 and oval-shaped shaft hole 4
5 and 47 are exemplified as non-circular cross-section parts and non-circular cross-section shaft holes that are fitted into each other for integration in the rotational direction, but it is clear that other shapes may be used as long as the cross-sections are non-circular. be.

"Effects of the Invention" As described above, in the motor of the present invention, the bevel gear on the rotating body side that meshes with the bevel gear of the potentiometer can be directly fixed to the output shaft of the rotating body without intervening an intermediate member. Therefore, it is possible to reduce weight and cost by reducing the number of parts and improving workability and assemblability. Additionally, the axial accuracy of the bevel gear and rotating body can be easily increased.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the main parts showing an embodiment of the motor of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4 is a bevel gear. FIG. 5 is a side view of a seat slide device exemplified as an example of the use of a motor with a potentiometer, FIG. 6 is a plan view of a conventional motor, and FIG. FIG. 6 is a sectional view taken along the - line in FIG. 6; 20...Motor, 22...Drive device, 30...
Potentiometer, 31... Rotating shaft, 32... Bevel gear, 40... Worm foil (rotating body), 4
1... Casing, 42... Output shaft, 43, 44
...Oval cross section (non-circular cross section), 45, 47
... Oval shaft hole (non-circular cross section shaft hole), 46 ... Bevel gear, 50, 51 ... Cover, 53 ... Meter support recess, 51 ... Fixing screw.

Claims (1)

[Scope of utility model registration request] An output shaft is provided on one side of a rotating body rotationally driven by a drive device, and a potentiometer having a rotation axis perpendicular to the rotation axis of this rotating body is positioned on the other side. In a motor in which a rotating shaft and a shaft portion of the rotating body are provided with bevel gears that mesh with each other, the output shaft is extended and protruded from the rotating body toward a potentiometer side,
A motor characterized in that the protruding portion is provided with a non-circular cross-section, and the bevel gear on the rotating body side is formed with a non-circular cross-section shaft hole that fits into the non-circular cross-section.