JPS633188B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention transmits the rotation of an input shaft connected to a motor to an output shaft to open and close an opening/closing body such as a windowpane or a sliding door of an automobile. This invention relates to a drive transmission device.

(Prior Art) A conventional drive transmission device, for example, a drive transmission device used in a power type window regulator, has a power transmission system that is connected to the motor side during the entire window opening/closing operation, as shown in Utility Model Publication No. 17113/1983. Generally, the configuration is such that the rotation of the connected input shaft is always transmitted to the output shaft at a constant reduction ratio.

(Problems to be Solved by the Invention) Generally, when opening and closing the window glass of a car, the final stage of the closing operation from near the fully closed position to the fully closed position, and the initial stage of the opening operation from the fully closed position to the vicinity of the fully closed position. At this stage, there is friction between the window glass and the frame, and close contact between the window glass and the shield rubber, so a large driving force is required to open and close the window glass. Further, when window glasses are connected in a cold region, an even greater driving force is required.

However, in the above-mentioned conventional drive transmission device used in power-type window regulators, the reduction ratio is always constant, so the window glass is moved due to insufficient driving force within the range from near the fully closed position to the fully closed position. If something happens that cannot be done or the window glass freezes, there is a problem in that a large load is placed on the motor and the motor may break down.

The present invention has been made by focusing on such a problem, and in a range that requires a large driving force, that is, from the fully closed position of the opening/closing body to the vicinity of the fully closed position, It is an object of the present invention to provide a drive transmission device that can reliably open and close an opening and closing body by decelerating the input shaft in response to the rotational displacement of an input shaft connected to a motor.

(Structure of the Invention) The gist of the present invention is to provide a drive transmission device that opens and closes an opening/closing body by transmitting the rotation of an input shaft connected to a motor side to an output shaft. A pulley is provided on each of the input shaft and output shaft, and a belt is wound around both the pulleys. 1 position, the groove width of the pulley becomes wider,
a second belt in which the belt abuts the pulley at an inward position;
The input shaft is movable in the axial direction between positions, and when the input shaft is displaced from the first position to the second position, the groove width of the pulley on the output shaft side becomes narrower, and the pulley The belt in contact with the input shaft is displaced from the inner position to the outer position, and further, in response to the rotational displacement of the input shaft, the input shaft is moved to the first position.
The invention resides in a drive transmission device characterized by being provided with a transmission mechanism using gears that switches and maintains one position or a second position.

(Operation of the Invention) In the drive transmission device, when the opening/closing body is located within a range from a fully closed position to near a fully closed position, the transmission mechanism responds to rotational displacement of the input shaft. The input shaft is switched and held in the second position, thereby causing the belt to contact the input shaft pulley at the inner position and the output shaft side pulley at the outer position, thereby causing rotation of the input shaft. is transmitted to the output shaft at a reduced speed, and when the opening/closing body is located outside the range, the transmission mechanism responds to the rotational displacement of the input shaft to switch and maintain the input shaft at the first position. Thereby, the belt is brought into contact with the pulley on the input shaft side at an outer position and the pulley on the output shaft side at an inner position.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

1 to 5 show an embodiment of the present invention.

As shown in FIGS. 1 and 2, the case 10 of the drive transmission device 1 includes an input shaft 2 and an output shaft 3.
is rotatably supported.

The input shaft 2 and the output shaft 3 are provided with an input pulley 4 and an output pulley 5 as V-groove pulleys with variable groove widths, and a belt B is wound around both pulleys 4 and 5. There is.

The body portion 20 of the input shaft 2 is fitted into a bearing sleeve 10a formed in the case 10 so as to be movable in the axial direction.

The input pulley 4 is composed of a fixed pulley piece 41 that is rotatably supported by the bearing sleeve 10a but not movable in the axial direction, and a movable pulley piece 42 that is fixed to the input shaft 2. . A V-groove of the input pulley 4 is formed by the inclined surface 41a of the fixed pulley piece 41 and the inclined surface 42a of the movable pulley piece 42.

The input shaft 2 has a first position (the position shown in FIG. 1) where the V groove width of the input pulley 4 is sandwiched and the belt B abuts the inclined surfaces 41a and 42a at an outer position, and a first position (the position shown in FIG. The V groove width of 4 becomes wider,
The belt B is movable in the axial direction between a second position (the position shown in FIG. 2) where the belt B contacts the inclined surfaces 41a and 42a at an inward position.

A spring member 1 is provided between the flange 21 of the input shaft 2 and the inner wall surface of the bearing portion 11 fixed to the case 10.
2 is interposed, and the input shaft 2 is urged toward the second position by the spring member 12.

A tooth portion 41b is formed on the fixed pulley piece 41, and this tooth portion 41b meshes with the worm gear G1 of the motor M.

The output pulley 5 includes a fixed pulley piece 51 fixed to the output shaft 3 and a movable pulley piece 52 externally fitted onto the output shaft 3 so as to be movable in the axial direction. Inclined surface 51a of fixed pulley piece 51
and the inclined surface 52a of the movable pulley piece 52 form a V-groove of the output pulley 5.

The movable pulley piece 52 has a wider V-groove width on the output pulley 5, and the belt B has a larger width than the inclined surface 51.
a first position (the position shown in FIG. 1) in which the belt B contacts the inclined surfaces 51a and 52a at an inward position; and a second position in which the V-groove width is sandwiched and the belt B abuts the inclined surfaces 51a and 52a at an outward position. (the position shown in FIG. 2).

A spring member 13 is interposed between the collar 53 fitted on the outside of the body 52b of the movable pulley piece 52 and the inner wall surface of the case 10.
3, the movable pulley piece 52 is urged toward the second position.

Further, a drive pinion 30 connected to the drive mechanism side of the opening/closing body is fixed to the output shaft 3.

Furthermore, in the case 10, the input shaft 2 is switched to the second position when the opening/closing body is located within the range from the fully closed position to the vicinity of the fully closed position in conjunction with the rotation of the input shaft 2. A transmission mechanism 6 is provided for holding the vehicle.

The transmission mechanism 6 includes a first shaft 61 and a second shaft 62 rotatably supported by the case 10, a gear 63 fixed to the first shaft 61, and a cam gear 64 fixed to the second shaft 62. It consists of The gear 63 has a first tooth portion 63a that meshes with a tooth portion 42b formed on the movable pulley piece 42 of the input pulley 4.
and a second tooth portion 63b that meshes with the tooth portion 64a of the cam gear 64.

As shown in Figures 1, 3, 4 and 5,
A cam groove 65 is recessed in the cam gear 64, and the engagement pin 22 formed at the end of the input shaft 2 is engaged with the cam mechanism 65. A ball bearing 23 that rolls on the guide surface of the cam groove 65 is attached to the engagement pin 22 .

The cam groove 65 has a first groove portion 65a that holds the input shaft 2 in the first position when the opening/closing body is located outside the range from the fully closed position to near the fully closed position, and a first groove portion 65a that holds the input shaft 2 in the first position when the opening/closing body is located outside the range from the fully closed position to the vicinity of the fully closed position. a second groove portion 65b that holds the input shaft 2 in the second position when
65b, and an inclined portion 65c connecting portions a and 65b.

The action will be explained below.

As shown in FIG. 1, when a switch (not shown) is turned on while the input shaft 2 is in the first position, the motor M rotates and the worm gear G1 rotates. As the worm gear G1 rotates, the fixed pulley piece 41 of the input pulley 4 rotates,
The rotation of the fixed pulley piece 41 is transmitted to the output pulley 5 via the belt B, and the output shaft 3 and drive pinion 30 rotate. The drive pinion 30
The rotation of the opening/closing body is transmitted to the drive mechanism of the opening/closing body, and the opening/closing body is driven.

In this way, when the input shaft 2 is in the first position, the belt B is attached to the inclined surface 41 of the input pulley 4.
a, 42a at the outer position, and the inclined surfaces 51a, 52a of the output side pulley 5 at the inner position, the rotation of the input shaft 2 is accelerated and transmitted to the output shaft 3. .

On the other hand, the fixed pulley piece 41 of the input side pulley 4
The rotation is transmitted to the transmission mechanism 6 via the belt B and the movable pulley piece 42. That is, as the movable pulley piece 42 rotates, the gear 63 that meshes with the tooth portion 42b and the cam gear 64 rotate. As the cam gear 64 rotates, the position of the cam groove 65 relative to the engagement pin 22 changes. At that time, when the opening/closing body is located outside the range from the fully closed position to the vicinity of the fully closed position, the ball bearing 2 of the engagement pin 22
3 is rolling within the first groove portion 65a of the cam groove 65, and the input shaft 2 is held at the first position.

When the opening/closing body approaches the above range, the engaging pin 22 is pushed into the cam groove 6 by the urging force of the spring member 12.
5, and moves within the inclined portion 65c toward the second groove portion 65b. This movement causes the input shaft 2 to be displaced from the first position toward the second position.

When the opening/closing body enters the range, the engagement pin 22 enters the second groove 65b, and the displacement of the input shaft 2 toward the second position is completed. Due to this displacement, the movable pulley piece 42 separates from the fixed pulley piece 41, the V-groove width of the input pulley 4 becomes wider, and the belt B is displaced from the outer position to the inner position on the inclined surfaces 41a and 42a. At the same time, the movable pulley piece 52 of the output pulley 5 is displaced from the first position shown in FIG. The groove width becomes narrower, and belt B becomes inclined surface 5.
1a and 52a are displaced from the inner position to the outer position.

When the input shaft 2 is in the second position in this way,
Since the rotation of the input shaft 2 is decelerated and transmitted to the output shaft 3, a large driving force is transmitted to the output shaft 3.

While the opening/closing body is located within the range, the engagement pin 22 is in the second groove 65b, and the input shaft 2 is held at the second position.

Conversely, when the opening/closing body moves outside the above range,
The engagement pin 22 moves from the second groove portion 65b to the inclined portion 65c.
and moves within the inclined portion 65c toward the first groove portion 65a.

This movement causes the input shaft 2 to be displaced from the second position toward the first position.

Next, an application example in which the drive transmission device 1 according to the present invention is used as a drive section of a power type window regulator will be described based on FIGS. 6 and 7.

The drive pinion 30 of the drive transmission device 1 is meshed with the sector gear 71 of the power type wind regulator 7, and when the drive pinion 30 to which the main arm 72 is fixed to the sector gear 71 rotates, the power is transmitted through the sector gear 71. main arm 72
rotates around a shaft 73, and the window glass 74 moves up and down due to this rotation.

When the window glass 74 moves up and down, if the window glass 74 is located within the range from near the fully closed position to the fully closed position as shown in FIG.
A larger driving force is transmitted from the driving pinion 30 to the sector gear 71 than when the driving force is outside the range.

The drive transmission device 1 according to the present invention can also be used as a drive unit of an automatic system for opening and closing objects such as a sliding door 8 as shown in FIG.

(Effects of the Invention) According to the drive transmission device of the present invention, when the opening/closing body is located within the range from the fully closed position to the vicinity of the fully closed position, the transmission mechanism is activated in response to the rotational displacement of the input shaft. By switching and holding the input shaft in the second position, a larger driving force is transmitted from the input shaft to the output shaft than when the opening/closing body is outside the range.
The opening/closing operation of the opening/closing body can be performed reliably.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a plan view of a gear train, and FIG. 3 is a longitudinal sectional view similar to FIG. 1. , FIG. 4 is an explanatory diagram of the transmission mechanism, FIG. 5 is a sectional view taken along the line V-V in FIG. Fig. 6 is an enlarged plan view of the main part, Fig. 7 is a front view showing the installed state, and Fig. 8 is a sliding door in which the drive transmission device according to the present invention can be used. FIG. 1... Drive transmission device, 2... Input shaft, 3... Output shaft,
4... Input side pulley (V groove type pulley), 5... Output side pulley (V groove type pulley), 6... Speed change mechanism,
M...Motor, B...Belt.

Claims (1)

[Claims] 1. In a drive transmission device that opens and closes an opening/closing body by transmitting the rotation of an input shaft connected to a motor side to an output shaft, a V-groove pulley with a variable groove width is connected to the input shaft and the output shaft. a first position where the groove width of the pulley on the input shaft side is narrower and the belt abuts the pulley at an outer position, and a groove of the pulley. The input shaft is movable in the axial direction between a second position where the width is increased and the belt abuts the pulley at an inward position, and the input shaft is displaced from the first position to the second position. At this time, the groove width of the pulley on the output shaft side becomes narrower,
A belt in contact with the pulley is configured to be displaced from an inward position to an outward position, and further includes a gear that responds to rotational displacement of the input shaft to switch and maintain the input shaft in the first position or the second position. A drive transmission device characterized by being provided with a speed change mechanism.