JPH039480Y2 - - 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., and more specifically, the rotation of the output shaft of a motor attached to the upper rail side is controlled by a reduction gear train. The present invention relates to a power type seat truck that is provided with a rack plate on the lower rail side that transmits deceleration to a pinion of a pinion rack mechanism and has a rack that 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, numeral 1 denotes a lower rail fixed to the floor surface of a vehicle body, etc., and numeral 2 denotes an upper rail slidably fitted to the lower rail 1 and attached to the seat frame side. 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. A bracket 3 is fixed to the upper rail 2, and has a hanging portion 3a parallel to the side surface of the upper rail 2, in which a through hole 3b is bored. Reference numeral 4 denotes a motor attached to the bracket 3 using an attachment hole 3c, and the motor 4 has a gearbox (reduction gear train consisting of a worm and a worm wheel) 4a in a part thereof. The gearbox 4a is provided with an output shaft consisting of a single shaft with both ends 4b and 4c protruding outside, and one end 4b of the output shaft is inserted into the through hole 3b of the bracket 3. A pinion 5 is provided in the penetrating portion. Moreover, this end portion 4b is
It 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. Reference numeral 7 denotes a rack plate fixed to the lower rail 1. A rack 7b is carved on the lower surface of the hanging portion 7a parallel to the vertical portion of the lower rail 1. The rack 7b meshes with the pinion 5, and the pinion It is adapted to form a rack mechanism.

In such a configuration, movement of the upper rail 2 in the front-back direction is performed by rotation of 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.

(Problems to be Solved by the Invention) By the way, in the above conventional example, the reduction gear train between the output shaft of the motor 4 itself (earlier stage of the gearbox 4a: not shown) and the pinion 5 (the reduction gear train in the gearbox 4a) There was a problem in that the upper rail 2 had a slight backlash in the front and rear directions due to backlash caused by bumps and the like, even though the motor 4 was stopped.

This idea was created in view of this problem.
The purpose is to realize a power seat track with almost no play in the upper rail.

(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 reduction gear train and transmits the rotation to the pinion of the pinion rack mechanism. , in a power seat truck in which a rack plate having a rack that meshes with the pinion is provided on the lower rail side, between the reduction gear train and the pinion/rack mechanism,
The present invention is characterized in that a brake mechanism is provided to remove play caused by the reduction gear train.

(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 constructed by a gearbox 4a and a pinion rack mechanism (formed by a pinion 5 and a rack 7b). It is placed between the In these figures, the same parts as in FIG. 4 are given the same reference numerals, and their explanations are omitted. The configuration of the brake mechanism 10 in this embodiment is as follows. That is, the first and second notches 12 and 13 are carved at opposing positions on the peripheral wall, and the core 15 is integral with the handle shaft 14.
are rotatably housed in the brake housing 11, and further provided in the housing 11 are first and second torsion springs 16 that press against the inner wall of the housing 11 and surround the core 15.
₁ , 16 ₂ are attached, and one end of the spring 16 ₁ , 16 ₂ is provided with a second notch 13 when the core 15 rotates.
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
spring 16 ₁ , 1
The outer diameter of the _first
The claw portion 18 integrated with the pinion 5 is inserted into the notch 12 of the spring 16 ₁ , 16 _{2 .}
By fitting the hook portions 16 ₁ b, 16 ₂ b at the other end into the slits 18 a, 18 b of the tab portion 18,
Hook parts 16 ₁ b, 16 ₂ b are locked to the claw part 18,
When a rotational force is applied to the claw portion 18, the spring 1
It is configured to generate braking force by expanding the outer diameter of 6 ₁ or 16 ₂ . In order to effectively apply the brake, the torsion springs 16 ₁ and 16 ₂ must normally have an effective number of turns of about 13/4 turns or 17/4 turns. Also, the gaps A, B, C, and D between the core 15 and the springs 16 ₁ and 16 ₂
(Refer to Fig. 3), the values of (A+D) and (B+C) are the ones that expand the outer diameter of the springs 16 ₁ and 16 ₂ to generate braking force when receiving rotational force from the pinion 5 side. Hook portion 16 ₁ b as necessary,
16 ₂ b is chosen so that it can be moved. Furthermore,
The value of C (or D) when the core 15 rotates and the gap A (or B) becomes 0 is the value of C (or D) when the core ₁₅ rotates and the gap _A (or _B ) becomes 0 _. b) is selected to be larger than the amount required to involve it and start rotating.

This brake mechanism 10 is mounted on the bracket 3 using the mounting hole 3e, the pinion 5 integrated with the claw part 18 is engaged with the rack 7b, and one end of the handle shaft 14 (on the right side in FIG. Although shown, a serration may be provided) into the fitting hole (oval-shaped hole) of the output shaft end 4b of the gearbox 4a, thereby making the connection. 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. 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 brake mechanism may have a different configuration.

(Effects of the Invention) As explained above, according to the present invention, it is possible to realize a power seat truck that is not affected by play caused by backlash or the like in a reduction gear train.

[Brief explanation of the drawing]

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.

Claims (1)

[Scope of utility model registration request] The rotation of the output shaft of the motor installed on the top rail side is decelerated by a reduction gear train, and the pinion
In a power type seat truck in which a rack plate is provided on the lower rail side, the rack plate has a rack that transmits power to a pinion of a rack mechanism and that meshes with the pinion. A power type seat truck characterized by being equipped with a brake mechanism to eliminate backlash caused by a reduction gear train.