JPH0120190Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a power seat truck used in automobiles, etc. More specifically, the invention relates to a power seat truck used in automobiles, etc. More specifically, the invention uses a gear train to reduce the rotation of the output shaft of a motor attached to the upper rail side. The present invention relates to a power type seat truck in which a rack plate is provided on the lower rail side and has a rack that transmits power to a pinion of a pinion rack mechanism and meshes with the pinion.

(Prior Art) As this type of power seat truck, the one shown in FIG. 4 has been known.

In FIG. 4, 1 is a lower rail fixed to the floor surface of a vehicle body, etc., and 2 is an upper rail that is slidably fitted to the lower rail 1 and attached to the seat frame. In the seat track, a combination (pair) of these rails 1 and 2 are arranged at regular intervals, but only one is shown in the figure and the other is omitted. Reference numeral 3 designates a bracket fixed to the upper rail 2, which has a hanging portion 3a parallel to the side surface of the upper rail 2, and a through hole 3b is bored therein. 4 is the mounting hole 3c in the bracket 3
The motor is installed using the motor 4.
has a gearbox (gear train) 4a in a part thereof. The gearbox 4a has both ends 4.
An output shaft is provided which is a single shaft with b and 4c projecting to the outside, one end 4b of which is inserted into the through hole 3b of the bracket 3, and a pinion 5 is provided in the through hole 3b. There is. Further, this end portion 4b is inserted into a through hole 6b of a bent portion 6a of a sub-bracket 6 fixed to the bracket 3 by welding or the like, and is supported. 7 is lower rail side 1
The lower surface of the hanging part 7a parallel to the vertical part of the lower rail 1 has a rack plate fixed to the rack plate.
b is carved, and the rack 7b is the pinion 5.
and mesh with each other to form a pinion/lack mechanism.

In such a configuration, the upper rail 2 can be moved in the front-rear direction by rotating the pinion 5. That is, when the motor 4 is driven to rotate the pinion 5, the driving force is transmitted to the bracket 3 through the engagement between the pinion 5 and the rack 7b of the rack plate 7. Therefore, the upper rail 2 slides along the lower rail 1. This direction of movement is determined by the direction of rotation of the motor 4.

(Problem that the invention aims to solve) By the way, in the case of this type of power seat truck, the pinion/rack mechanism converts rotational motion into linear motion, but at that time, the distance between the pinion and rack changes, causing the upper rail to change. There was a problem that the vehicle did not run smoothly.

This idea was created in view of this problem.
The purpose is to realize a power-operated seat truck that allows the Atsupararu to run safely.

(Means for Solving the Problems) The present invention to solve the above problems reduces the rotation of the output shaft of the motor attached to the upper rail side using a gear train and transmits it to the pinion of the pinion rack mechanism. In a power type seat truck in which a rack plate having a rack that meshes with the pinion is provided on the lower rail side, a roller is attached to the support shaft of the pinion, and the roller is fixed to the lower rail side by a guide rail that moves in the direction of movement of the upper rail. It is characterized by providing guidance.

(Example) Hereinafter, an example of the present invention will be described in detail using the drawings. FIG. 1 shows an embodiment of the present invention, in which a brake mechanism 10 whose main parts are shown in FIGS. 2 and 3 is connected to a gearbox 4a and a pinion.
A structure disposed between the rack mechanism (formed by pinion 5 and rack 7b) is shown. In these figures, the same parts as in FIG. 4 are given the same reference numerals, and their explanations are omitted. First, the configuration of the brake mechanism 10 in this embodiment is as follows. That is, a core 15, which has first and second notches 12 and 13 carved in opposing positions on the peripheral wall and is integral with the handle shaft 14, is rotatably accommodated in the brake housing 11, and furthermore, the core 15 is rotatably housed in the brake housing 11. First and second torsion springs 16 ₁ and 16 ₂ that press against the inner wall of the housing 11 and surround the core 15 are installed inside the housing 11 , and the core 15 is attached to one end of the springs 16 ₁ and 16 ₂ . The hook portions 16 ₁ a and 16 ₂ a that can be engaged with the side ends 13 a and 13 b of the second notch 13 are bent and formed so that when the core 15 rotates, either of the hook portions 16 ₁ a or 16 ₂ a to tighten the outer diameters of the springs 16 ₁ and 16 ₂ , and a pinion 5 is arranged in the first notch 12.
and the hook portions 16 _{1 b} , 16 ₂ b at the other ends of the springs 16 ₁ , 16 ₂ .
By fitting these into the slits 18a, 18b of the claw portion 18, the hook portions _161b , _162b are locked to the claw portion 18, and when a rotational force is applied to the claw portion 18, the spring ₁₆₁ or ₁₆₂ It is configured to generate braking force by expanding the outer diameter of the brake.
In order to effectively apply the brake, the torsion springs 16 ₁ and 16 ₂ are normally 13/4
It is necessary to have an effective number of turns of approximately 17/4 turns or 17/4 turns. Also, among the gaps A, B, C, and D (see Fig. 3) between the core 15 and the springs 16 ₁ and 16 ₂ , (A+
The values of D) and (B+C) are such that the hook portions _{16 1 b ,} 16 ₂ b is chosen so that it can be moved. Furthermore, the core 15 rotates and the gap A
Or, the value of C or D at the time when B becomes 0 is that the core 15 is the hook part 1 of the spring 16 ₁ or 16 ₂ .
It is selected to be larger than the winding allowance required to wind in 6 ₁ a or 16 ₂ b and start rotation.

To install this brake mechanism 10, attach the housing 11 to the bracket 3 using the attachment hole 3e,
The pinion 5 integrated with the claw portion 18 is engaged with the rack 7b, and one end of the handle shaft 14 (right side in FIG. 1;
Although the one with an oval cross section is shown, a serration may be provided) at the output shaft end 4b of the gearbox 4a.
This is done by inserting it into the fitting hole (oval-shaped hole).

A roller 20 is press-fitted and fixed to the other end of the handle shaft 14, and the roller 20 is inserted into a U-shaped portion 21a of a guide rail 21 fixed to the rack plate 7 with a small gap therebetween. Further, a stopper 22 for regulating the movement of the roller 20 moving in the longitudinal direction of the guide rail 21 is inserted into the end of the U-shaped portion 21a of the guide rail 21 while being fitted with the U-shaped fitting 23. and is fixed using bolts 24 and nuts 25. The material of this stopper 22 is an elastic material such as rubber. In this embodiment, the lower part of the sub-bracket 6 is fixed to the bracket 3.

In the power seat truck configured as described above, when the core 15 integrated with the handle shaft 14 is rotated counterclockwise by the motor 4, the second
The side end 13a on the notch 13 side is the spring 16
₁ to compress the outer diameter of _the spring ₁₆₁ . When the core 15 is further rotated, the side end 12a on the first notch 12 side hits the claw part 18,
The claw portion 18 will be pressed. Therefore, the claw part 1
8, the pinion 5 rotates, and the upper rail 2
will be moved. During this movement, roller 2
0 rolls (slides) within the U-shaped portion 21a of the guide rail 21, so the upper rail 2 travels with almost no fluctuation in the vertical direction. Therefore, the running of the upper rail 2 becomes extremely stable. Further, since the stopper 22 is used, the generation of abnormal noise can be drastically reduced compared to the conventional case where cut and raised metal pieces 3d and 7c (see FIG. 4) are brought into contact with each other. The same applies to the case of clockwise rotation of the core 15.

On the other hand, from the pinion 5 side to the claw portion 18,
Since the hook portions 16 _{1 b} , _{16 2} b of the springs 16 1 , 16 ₂ are locked to the claw portion 18 even when rotational force is applied in either the clockwise or counterclockwise direction,
The claw portion 18 immediately spreads the spring 16 ₁ or 16 ₂ to generate a large braking force due to the frictional force between the spring 16 ₁ or 16 ₂ and the inner wall of the housing 11 . For this reason, rotation of the pinion 5 is promptly prevented. Therefore, backlash caused by backlash or the like in the gearbox 4a does not affect the upper rail 2.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications are possible. For example, the configuration of the brake mechanism may be different, or the brake mechanism itself may not be provided. However, if there is no brake mechanism,
It is necessary to attach the pinion 5 to the output shaft of the gear box 4a, and also to attach the roller 20 to the output shaft.

(Effect of the invention) As explained above, in this invention, the pinion
The pinion support shaft of the rack mechanism (handle shaft 14
Since rollers are attached to the output shaft of the gearbox 4a and are guided by guide rails, it is possible to realize a power-operated seat track with stable upward running.

[Brief explanation of drawings]

Fig. 1 is a schematic exploded perspective view showing one embodiment of the present invention, Fig. 2 is an exploded view showing the configuration of the main parts of the brake mechanism used in the embodiment of Fig. 1, and Fig. 3 is also similar to Fig. 1. FIG. 4 is an explanatory diagram showing the configuration of the main parts of the brake mechanism used in the embodiment, and FIG. 4 is a schematic exploded perspective view of a conventional power type seat truck. 1...Lower rail, 2...Atsupa rail, 3...
...Bracket, 3a...Descent part, 3b...Through hole, 4...Motor, 4a...Gearbox, 4
b, 4c... end, 5... pinion, 6... sub bracket, 7... rack plate, 7a... drooping part, 7b... rack, 10... brake mechanism,
11... Brake housing, 12, 13... Notch, 12a, 12b, 13a, 13b... Side end, 14... Handle shaft, 15... Core, 16 ₁ ,
16 ₂ ... Torsion spring, 16 ₁ a, 16
₁ b, 16 ₂ a, 16 ₂ b...Hook part, 18...Claw part, 18a, 18b, 18c...Slit, 20
...Roller, 21...Guide rail, 21a...
U-shaped part, 22... Stopper, 23... U-shaped metal fitting.

Claims (1)

[Scope of utility model registration request] The rotation of the output shaft of the motor installed on the upper rail side is decelerated by a gear train and transmitted to the pinion of the pinion/rack mechanism, and a power seat is equipped with a rack plate on the lower rail side that has a rack that meshes with the pinion. A power-type seat truck characterized in that a roller is attached to the support shaft of the pinion, and the roller is guided in the moving direction of the upper rail by a guide rail fixed to the lower rail side.