JPH0669493U - Pinion unit - Google Patents

Abstract

(57) [Abstract] [Purpose] To achieve a desired damper function while achieving miniaturization of a pinion unit. [Structure] The pinion unit is a resin-made intermediate wheel 1 in which a pinion 14 is integrally formed with a flange portion 21.
5 and a worm wheel 16 arranged on the outside thereof. The intermediate wheel 15 is provided with an outer projection 22 and the worm wheel 16 is provided with an inner projection 24, and the flexible damper 2 made of rubber or the like is positioned between them.
5 are arranged. The damper 2 is attached to the intermediate wheel 15.
A damper escape portion 26 is formed so that the member 5 can be deformed when it is sandwiched between the inner protrusion 24 and the outer protrusion 22. The damper escape portion 26 is visible from the outside through a confirmation window 27 formed in the flange portion 21.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pinion unit in which the rotation of a worm gear is transmitted to a pinion gear that is concentric with the worm gear through a damper for absorbing impact, and is particularly useful for driving a window regulator that raises and lowers a vehicle door glass. Regarding the unit.

[0002]

[Prior art]

 A power window regulator for raising and lowering a vehicle door glass by using the driving force of a motor is composed of a regulator unit having a link mechanism and a pinion unit for driving the regulator unit. The basic structure thereof is described, for example, in “Structure of Automotive Electrical Equipment” (published by Sankaido Co., Ltd.), pages 157 and 158.

A pinion unit used in such a power window regulator has a worm gear attached to a shaft of a motor and a worm wheel meshing with the worm gear. The rotation of the motor is decelerated and transmitted to the pinion. The regulator is driven by this pinion.

[0004]

[Problems to be solved by the device]

 Moreover, since the pinion unit used in the power window regulator is incorporated in the door of the vehicle, there is a limit to the size, and the size must be reduced. Further, in this type of pinion unit, in order to transmit the rotational power of the worm wheel by buffering it to the pinion, the rubber damper is connected to the worm wheel and the pinion without directly connecting the worm wheel and the pinion. It needs to be placed in between.

Therefore, the intermediate wheel is integrally attached to the pinion, a damper housing is formed between the intermediate wheel and the worm wheel, and the damper is housed in the damper housing.

By the way, in order to meet the demand for weight reduction of the pinion unit, the present inventor is developing a pinion unit of a type in which only the pinion part is made of metal and the intermediate wheel is made of resin. The following were considered during this development process. That is, in order to develop a pinion unit suitable for various types of regulators, the diameter of the pinion must be increased, and the bearing on the housing side that rotatably supports the intermediate wheel integrated with the pinion. The diameter of the part had to be increased.

Therefore, the diameter of the portion of the resin-made intermediate wheel corresponding to the bearing has to be increased, and the volume of the damper housing, which is the damper housing portion between the worm wheel and the worm wheel arranged on the outer side, has to be large. The problem of becoming smaller occurred. If this volume becomes small, it will not be possible to secure the escape of the damper when the damper is compressed, and it will not be possible to exert the damper effect.

[0008] Furthermore, about four dampers are incorporated in one pinion unit, and if even one is left unassembled when manually assembling the pinion unit, the presence of the damper from the outside after the assembly is completed. Since it cannot be confirmed, it was necessary to conduct a characteristic test etc. to inspect whether a prescribed number of dampers were installed.

An object of the present invention is to achieve a size reduction of a pinion unit while ensuring a sufficient space for contraction and deformation of a damper mounted between a worm wheel and a pinion so that the damper can absorb shock. Is to improve the assembly efficiency and the production efficiency.

[0010]

[Means for Solving the Problems] The typical ones of the inventions disclosed in the present application will be outlined below.

That is, a worm wheel meshes with a worm wheel rotatably mounted in the housing, and the worm wheel is driven by the worm gear rotated by the motor. Inside the housing, there is provided an intermediate wheel which is located inside the worm wheel and has an integrated pinion. The first protrusion provided on the intermediate wheel and the second protrusion provided on the worm wheel are provided. A damper made of a flexible member that absorbs shock during rotation is arranged between the dampers. The intermediate wheel has a damper escape part that the damper will enter when the damper deforms, and a confirmation window is formed on the flange part of the intermediate wheel to expose the damper escape part to the outside of the intermediate wheel. ing.

[0012]

[Action]

 In the pinion unit having the above configuration, when assembling the pinion unit, with the intermediate wheel, the worm wheel, and the damper incorporated in the housing, a predetermined number of external parts of the intermediate wheel are inserted through the confirmation window. It is possible to visually check whether the damper is installed. Further, when the pinion unit is activated and the damper is elastically deformed between the first protrusion and the second protrusion, the damper enters the damper escape portion and is elastically deformed sufficiently, thus increasing the size of the pinion unit. It is possible to obtain a desired shock absorbing function without doing so.

[0013]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the illustrated pinion unit according to an embodiment of the present invention. 1 is a partially cutaway front view showing a pinion unit applied to drive a power window regulator, and FIG. 2 is a sectional view of FIG.

A motor 11 is integrally attached to a housing 10 of the pinion unit. The housing 10 has a pinion projecting hole 12, and an opening 13 for inserting a component is formed on the facing surface side of the housing 10. 10 has a cup-shaped cross section. An intermediate wheel 15 integrated with the pinion 14 is housed in the housing 10 with the pinion 14 protruding from the pinion protruding hole 12.

In the illustrated case, the pinion 14 is made of metal, and the intermediate wheel 15 is made of synthetic resin. Therefore, after the pinion 14 is manufactured in advance, the intermediate wheel 15 is resin-molded while the pinion 14 is set in the resin molding die, so that the intermediate wheel 15 is insert-molded integrally with the pinion 14.

A worm wheel 16 made of resin is arranged outside the intermediate wheel 15, and a worm gear 18 meshing with a tooth portion 17 formed on the outer periphery of the worm wheel 16 is rotatably attached to the housing 10. There is.

Details of the intermediate wheel 15 integrated with the pinion 14 are as shown in FIGS. 3 and 4, and the tip of the intermediate wheel 15 is a journal portion 20. Is rotatably supported with the pinion projecting hole 12 of the housing 10 as a bearing. A space between the journal portion 20 of the intermediate wheel 15 and the housing 10 is sealed by a liquid gasket 19 as shown in FIG.

A flange portion 21 is formed at the base end portion of the intermediate wheel 15, and is positioned on the inner surface side of the flange portion 21 so as to project radially outward from the outer peripheral portion of the intermediate wheel 15 to form two outer portions. A square protrusion 22 is formed. These two outer protrusions 22 are in phase with each other by 180 degrees.

FIG. 5 and FIG. 6 are views showing the details of the worm wheel 16, which are generally annular and have a tooth portion 17 formed on one side in the axial direction of the outer peripheral surface. The side on which the tooth portion 17 is formed. A fitting surface 23 is formed on the inner surface on the opposite side to the outer surface of the flange portion 21 of the intermediate wheel 15.

Further, the inner surface of the worm wheel 16 is formed with two inward projections 24 protruding inward in the radial direction, and these two inward projections 24 are 180 ° out of phase with each other. Has become. Therefore, when the worm wheel 16 is fitted to the outer side of the intermediate wheel 15 with the outer protrusion 22 and the inner protrusion 24 displaced in the circumferential direction, the outer protrusion 22 and the inner protrusion 24 are not fitted to each other. A total of four arc-shaped spaces will be formed.

As shown in FIGS. 5 and 7, a total of four arc-shaped dampers 25 are accommodated in each space, and the worm wheel 16 is rotated by the dampers 25. It is transmitted via the intermediate wheel 15. Each damper 25 is formed of a flexible member such as rubber.

During transmission of this rotational force, the damper 25 contracts and deforms between the outer protrusion 22 and the inner protrusion 24, and deforms so that the intermediate wheel 15 becomes thicker in the radial direction. In order to sufficiently secure this deformation amount, a damper escape portion 26 having a diameter smaller than that of the journal portion 20 at the tip of the intermediate wheel 15 is provided in the intermediate wheel 15 in correspondence with the position of the damper 25 as shown in FIGS. It is notched and formed as shown. In the illustrated case, a total of four damper escape portions 26 are formed.

The damper escape portion 26 is exposed to the outside of the flange portion 21 so that the damper 25 arranged between the intermediate wheel 15 and the worm wheel 16 can be seen from the outside. 21 has a total of four confirmation windows 27 formed in an arc shape.

In order to close the opening 13 formed in the housing 10 while the intermediate wheel 15, the worm wheel 16 and the damper 25 are accommodated in the housing 10, the bottom cover 28 is provided with a bottom cover 28. It is adapted to be fitted to the opening 13 side of the. An O-ring 29 seals between the bottom cover 28 and the housing 10.

As shown in FIG. 1, the housing 10 is provided with a screwing portion 30 for mounting the pinion unit inside the vehicle door.

As shown in the figure, when the intermediate wheel 15 is formed integrally with the pinion 14 using resin, increasing the diameter of the pinion 14 results in an increase in the diameter of the journal portion 20 of the intermediate wheel 15. However, if the thickness of that portion becomes large, the sinkage of the resin at the time of molding the intermediate wheel 15 will become large. However, as shown in the figure, by forming the damper escape portion 26, the occurrence of sink marks is reduced and a high quality intermediate wheel can be formed.

Next, the procedure for assembling the illustrated pinion unit will be described. With the worm gear 18 assembled to the housing 10, the worm wheel 16 and the damper 25 are assembled into the housing 10 from the opening 13 side. Next, the intermediate wheel 15 integrally formed with the pinion 14 is set so that the outer protrusion 22 provided on the intermediate wheel 15 does not interfere with the inner protrusion 24 provided on the worm wheel 16 and the damper 25. And is assembled from the opening 13 side.

As a result, as shown in FIG. 7, a total of four dampers 25 are accommodated in the damper accommodating spaces formed between the respective outer protrusions 22 and inner protrusions 24. Whether or not a predetermined number of dampers 25 are accommodated can be visually confirmed from the outside of the flange 21 through the confirmation window 27, and it is possible to reliably prevent forgetting to attach the dampers 25. By covering the opening 13 with the bottom cover 28, the assembly of the pinion unit is completed.

When such a pinion unit is used to drive a window regulator, the door glass is opened and closed by rotating the motor 11 in both forward and reverse directions. For example, when the motor 11 is driven to rotate in the normal direction, the worm wheel 18 is driven by the worm gear 18 via the two dampers 25 sandwiched between the outer protrusion 22 and the inner protrusion 24 of the four dampers 25. The rotation of 16 is transmitted to the intermediate wheel 15 and the pinion 14, and the power is transmitted to the regulator meshing with the pinion 14.

At this time, the damper 25 is compressed and deforms so as to widen in the radial direction of the intermediate wheel 15 so as to have a larger width, and buffers the shock. At this time, since the damper escape portion 26 is formed, the damper 25 is freely deformed so as to be inserted therein, and the desired damper function is sufficiently obtained without increasing the diameter of the intermediate wheel 15 itself. Will be obtained.

When the motor 11 is rotationally driven in the reverse rotation direction, the dampers 25 other than the damper 25 compressed in the forward rotation direction are compressed, and a desired damper function is similarly obtained.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say.

For example, the illustrated pinion unit was used to drive the regulator in the power window regulator of the vehicle, but the present invention should be applied if it has a damper function and transmits the rotation of the worm wheel to the pinion. Is possible. Also, although the number of dampers 25 is four in the illustrated case, this number can be set to various numbers such as two and six.

[0034]

[Effect of device]

 The effects obtained by the representative one of the inventions disclosed in the present application will be briefly described as follows.

(1). Since the damper escape portion when the damper arranged between the intermediate wheel and the outer worm wheel is compressed is formed in the intermediate wheel, the diameter of the intermediate wheel is As a result, the damper can be sufficiently deformed when the damper contracts without increasing the diameter of the worm wheel, and the desired cushioning function can be obtained while reducing the size of the pinion unit.

(2). Since the confirmation window for exposing the damper escape portion to the outside of the flange portion is formed on the flange portion, when assembling the pinion unit, it is possible to determine whether or not the damper is assembled. It can be confirmed from the outside of the wheel, improving the assembly production efficiency.

(3). When molding the intermediate wheel with resin, since the damper escape portion is formed in the intermediate wheel, it is possible to reduce the wall thickness of the resin portion and to prevent sink marks during molding. This makes it possible to form high quality intermediate wheels.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a pinion unit according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG.

3 is a perspective view showing the intermediate wheel shown in FIGS. 1 and 2. FIG.

FIG. 4 is a plan view (A) and a bottom view (B) of the intermediate wheel shown in FIG.

5 is a perspective view showing the worm wheel shown in FIGS. 1 and 2. FIG.

6 is a sectional view (A) and a bottom view (B) of the worm wheel shown in FIG.

FIG. 7 is a cross-sectional view showing an arrangement state of dampers.

[Explanation of symbols]

 10 Housing 11 Motor 12 Pinion Projection Hole 13 Opening 14 Pinion 15 Intermediate Wheel 16 Worm Wheel 17 Teeth 18 Worm Gear 19 Liquid Gasket 20 Journal Part 21 Flange 22 Outer Protrusion (First Protrusion) 23 Fitting Surface 24 Inner Protrusion (Second protrusion) 25 Damper 26 Damper escape part 27 Confirmation window 28 Bottom cover 29 O-ring 30 Screw stop part

Claims (1)

[Scope of utility model registration request] 1. A pinion in which a resin-made intermediate wheel having a flange portion is integrally housed in a housing having a pinion projecting hole formed therein so as to project from the pinion projecting hole, and a motor is provided outside the intermediate wheel. A pinion unit configured to transmit a rotation of the worm wheel to the pinion via a shock absorbing damper, the first protrusion formed on the intermediate wheel, and The damper is arranged between the second protrusion formed on the worm wheel, a damper escape portion having a diameter smaller than a tip portion of the intermediate wheel is formed on the intermediate wheel, and the damper escape portion is formed on the flange portion. A pinion unit, wherein a confirmation window is formed on the flange portion so as to be exposed to the outside of the pinion unit.