JP2528847Y2 - Power transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a power transmission device which is inserted into a power transmission path of a power window device or a sunroof opening / closing device of an automobile and also has a buffer function.

[Conventional technology]

Many conventional power transmission devices of this type are provided with a shock absorber filled with rubber between a shaft and a surrounding member surrounding the shaft, and the power is supplied from a surrounding member of the shock absorber to a rubber member. When transmitted through the shaft path and the window or sunroof of the car is fully closed or fully opened and the load suddenly increases, the rubber is greatly deformed and absorbs the shock generated at that time .

[Problems to be solved by the invention]

However, in the conventional power transmission device,
In order to strongly bond the rubber with the shaft and the rubber with the surrounding member, liquid rubber is injected between the shaft and the surrounding member to be solidified, or the rubber, the shaft and the surrounding member are bonded with an adhesive. There has been a problem that it has to be adhered, and the production is troublesome and the production cost is increased.

The present invention has been made in order to solve the above-mentioned conventional problems. For example, a cushioning material such as liquid rubber is injected between components and solidified, or the cushioning material is bonded to another component with an adhesive. It is an object of the present invention to provide a power transmission device capable of reducing manufacturing costs without the necessity of performing the operation.

[Means for solving the problem]

The power transmission device according to the present invention includes a gear provided with a space therein, unevenness provided on an inner surface of one side wall of the gear, and a shaft arranged coaxially with the gear and rotatable with respect to the gear. And a meshing body accommodated in the gear coaxially with the gear, rotatable with respect to the gear and movable in the axial direction, and non-rotatable with respect to the shaft, and provided in the meshing body. Having irregularities meshed with the irregularities of the gear, and a cushioning material accommodated in the gear between the inner surface of the other side wall of the gear and the meshing body. The unevenness of the meshing body is such that when a torque smaller than a predetermined value is acting, the gear and the meshing body rotate integrally, but when a torque greater than a predetermined value acts, the gear and the meshing body rotate relative to the gear. It is shaped so as to sometimes move in the axial direction toward the cushioning material and press the cushioning material.

[Action]

In the present invention, assuming that the gear is connected to the drive side and the shaft is connected to the load side, if the acting torque is smaller than a predetermined value, the unevenness of the gear meshes with the unevenness of the meshing body so that the gear meshes with the gear. The body and the body rotate together, and power is transmitted via a power source → gear → meshing body → shaft → load path.

However, when the load side becomes unable to rotate and the meshing member also stops rotating, the acting torque becomes greater than a predetermined value, the integral relationship between the gear and the meshing member ends, and the gear continues to rotate, while the meshing member stops rotating. The cushioning material moves in the axial direction toward the cushioning material while being pressed, and the cushioning material is pressed and deformed. This results in the cushioning material being substantially interposed between the gear and the shaft, and the cushioning material performs a cushioning function.

In this power transmission device, a rubber cushioning material can be incorporated into the device as it is, and a cushioning material such as liquid rubber can be injected between parts and solidified, or the cushioning material can be used for other parts. There is no need to bond with an adhesive.

〔Example〕

Hereinafter, the present invention will be described based on an embodiment shown in the drawings.

1 to 5 show an embodiment in which the power transmission device according to the present invention is used for a power window device of an automobile. In this embodiment, a worm 2 is provided on a rotating shaft of a motor 1 (only shown in FIG. 5), and a worm wheel 3 is meshed with the worm 2.

The worm wheel 3 includes a worm wheel main body 4 made of plastic and a lid 5 also made of plastic. The worm wheel main body 4 is generally formed in a shallow bottomed cylindrical shape,
Teeth 6 meshing with the worm 2 are provided on the outer peripheral surface thereof. The lid 5 is fixed to the opening end of the worm wheel main body 4 by heat welding or the like and integrated, and a space is formed between the lid 5 and the worm wheel main body 4. On the inner surface of the lid 5 (which forms the inner surface of one side wall of the worm wheel 3), as shown in FIG. 3, irregularities 7 are provided. This unevenness 7 is a non-inclined surface
An appropriate number of combinations of 7a and inclined surfaces 7b and 7c which are continuous on opposite sides of the non-inclined surface and are inclined in opposite directions are provided. In this embodiment, the non-inclined surface 7a and the inclined surface 7a
b and 7c are planes, respectively.

Reference numeral 8 denotes a shaft arranged coaxially with the worm wheel 3. The shaft 8 is rotatable with respect to the worm wheel 3, and has a non-circular cross section 8a at one end and a spline 8b at the other end. ing. Non-circular cross section of this shaft 8
The 8a side is inserted into the worm wheel 3, and the spline 8b side is projected outside the worm wheel 3 and the gear 9 is fitted and fixed.

In a space surrounded by the worm wheel 3 and the lid 5, a meshing member 10 made of a metal plate and an annular cushioning material 12 made of rubber are housed as shown in FIG. The meshing member 10 is housed next to the lid 5 and has a shape corresponding to the irregularities 7 of the lid 5.
It is bent by press working so as to form unevenness that meshes with. In addition, a non-circular hole 11 is provided in the center of the meshing body 10, and the hole 11 is fitted in the non-circular section 8 a of the shaft 8 in a cross section. As a result, the meshing member 10 cannot rotate with respect to the shaft 8 and can move in the axial direction. On the other hand, on the surface of the cushioning member 12 on the side of the meshing body 10, there is provided unevenness 13 which meshes with the unevenness formed by the meshing body 10. The cushioning member 12 is not in contact with the shaft 8. Note that the cushioning material 12 can be made of not only rubber but also other kinds of materials having the same function.

The gear 9 is meshed with a sector gear 12, and the sector gear 12 is linked to a window glass (not shown) of an automobile via a link mechanism (not shown).

 Next, the operation of the present embodiment will be described.

In the normal state, the unevenness of the meshing body 10 is engaged with the unevenness 7 of the lid 5 so that the worm wheel 3
When the motor 1 is driven, the power is transmitted through the path of the worm 2 → the worm wheel 3 → the meshing body 10 → the shaft 8 → the gear 9 → the sector gear 12 → the link mechanism. Power is transmitted to the window glass, and the window glass is raised and lowered.

When the window glass reaches the upper limit position or the lower limit position and can no longer move up and down, the sector gear 12, the gear 9, the shaft 8
And the meshing body 10 cannot rotate, and stops rotating. Therefore, the acting torque becomes equal to or greater than a predetermined value, and the integral relationship between the worm wheel 3 and the meshing body 10 ends.
While the worm wheel 3 continues to rotate, the meshing body 10 moves in the axial direction toward the cushioning material 12 while the rotation is stopped, and presses the cushioning material 12 to deform it. Thereby, the cushioning material is substantially provided between the gear 3 and the shaft 8.
As a result, the buffer material 12 performs a buffer function.

In this power transmission device, the cushioning material 12 made of rubber or the like can be incorporated into the device as it is, and liquid rubber is injected between the components to be solidified, or the rubber is bonded to another component with an adhesive. No need to do.

In the above embodiment, the gear 3 containing the cushioning material is a worm wheel. However, in the present invention, other types of gears may contain the cushioning material.

Although the above embodiment is an example in which the present invention is applied to a power window device of an automobile, the power transmission device according to the present invention can be used for other types of devices such as a sunroof opening / closing device of an automobile.

Further, in the above embodiment, the bumps 13 corresponding to the bumps of the meshing body 10 are also provided on the cushioning member 12, but the bumps 13 of the cushioning member 12 are not necessarily provided.

[Effect of the invention]

As described above, the power transmission device according to the present invention does not require a liquid rubber or other cushioning material to be injected between the components to be solidified, nor does the cushioning material need to be bonded to other components with an adhesive. , And an excellent effect of being able to be reduced can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a power transmission device according to the present invention, FIG. 2 is an exploded perspective view showing a main part of the embodiment, and FIG. 3 is an inner surface of a worm wheel cover in the embodiment. FIG. 4 is a plan view showing a main part of the embodiment, and FIG. 5 is a plan view showing the embodiment. 3: worm wheel, 7: unevenness, 8: shaft, 10: meshing body, 12: cushioning material.

Claims (1)

(57) [Scope of request for utility model registration] A gear provided with a space therein, irregularities provided on an inner surface of one side wall of the gear, a shaft arranged coaxially with the gear and rotatable with respect to the gear, and A meshing member accommodated in the gear coaxially with the gear, rotatable with respect to the gear and movable in the axial direction, and non-rotatable with respect to the shaft; and the gear provided on the meshing member. And the cushioning material accommodated in the gear between the inner surface of the other side wall of the gear and the meshing body, and the unevenness of the gear and the meshing body. The unevenness, when a torque smaller than a predetermined value is acting, the gear and the meshing body rotate integrally, but when a torque equal to or more than a predetermined value acts, the meshing body rotates relative to the gear and simultaneously with the axial direction, Before A power transmission device characterized in that the power transmission device is shaped so as to move to the buffer material side and press the buffer material.