JP2526449Y2 - Drive elements for automotive power units - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive element of a power unit for an automobile, which transmits power to a drive object via a gear wheel and a pinion. This drive element is applied to, for example, a power seat slide device, a power window regulator, and the like.

[0002]

2. Description of the Related Art As a driving element of a conventional automobile power unit, there is, for example, one shown in FIGS. That is, the pinion 3 is attached to the cylindrical projection 2 of the interposition member 1.
The rotation shaft 4 is fitted and copper-welded, and the cylindrical projection 2 of the interposition member 1 is fitted into the center hole 6 of the gear wheel 5 made of resin. Circular flange 7 of interposition member 1
A screw hole 7a for the countersunk biz 8 is formed in the gear wheel 5, and an insertion hole 5a is formed in the gear wheel 5 corresponding to the screw hole 7a. The entrance 5b of the insertion hole 5a is formed in a horn shape, and when the dish 8 is tightened, the head of the dish 8 fits into the entrance 5b of the insertion hole 5a. Is prevented, and rattling in the relative rotation direction between the interposition member 1 and the gear wheel 5 is prevented.

[0003]

However, in such a driving element of the conventional power unit for an automobile, the rotating shaft portion 4 of the pinion 3 does not directly fit into the center hole 6 of the gear wheel 5 and has a cylindrical shape. It is fitted into the center hole 6 via the projection 2, and the centering of the rotation shaft 4 of the pinion 3 is difficult because the centering of the rotation member 4 is related to the accuracy of each of the three components of the interposition member 1, the pinion 3 and the gear wheel 5. In addition, if the dish 8 is tightly tightened to prevent rattling in the relative rotation direction between the interposition member 1 and the gear wheel 5, the teeth of the gear wheel 5 near the dish 8 are deformed. Therefore, when the gear wheel 5 does not mesh properly with the worm, for example, there is a problem that abnormal noise is generated.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem. A drive unit of a power unit for an automobile in which the rotation shaft of a pinion can be easily centered and no abnormal noise is generated. It is intended to provide elements.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide a vehicle for transmitting power to a driven object via a gear wheel (10) and a pinion (20). In the drive element of the power unit,
The pinion (20) is fixed to the gear wheel (10) via an interposition member (30), and the interposition member (30) is fixed.
Are centered on a caulking hole (31) into which the rotation shaft portion (21) of the pinion (20) protrudes so as to be relatively non-rotatable and immovable, and a caulking hole (31). The gear wheel (10) has a rotation axis (21) of the pinion (20) in the protruding state, which directly determines an axis of the pinion (20). A drive element of a power unit for an automobile, comprising: a fitting hole (12) to be fitted therein; and a press-fit portion (16) in which the detent portion (33) is press-fitted so as not to rotate relatively. Exist.

[0006]

When the rotating shaft (21) of the pinion (20) is fitted into the caulking hole (31) of the interposition member (30), the rotating shaft (21) of the pinion (20) projects. The rotation member and the pinion (20) are relatively non-rotatable and non-separable, and the interposition member (30) and the pinion (20) are assembled.

Next, the rotating shaft portion (21) of the pinion (20) in the protruding state is directly fitted into the fitting hole (12) of the gear wheel (10). Thereby, the pinion (2) can be easily formed regardless of the shape accuracy of the interposition member (30).
The centering of the rotary shaft portion (21) can be performed.

[0008] The rotation stop portion (3) of the intervening member (30) is provided.
When 3) is pressed into the press-fit portion (16) of the gear wheel (10), the interposition member (30) and the gear wheel (10) become relatively unable to rotate, and the interposition member (30) There is no backlash in the rotation direction, and the rotation shaft (21) of the pinion (20) is relatively non-rotatably attached to the interposition member (30). Can be relatively non-rotatably assembled.

Power is transmitted to the driven object via the gear wheel (10), the interposition member (30), and the pinion (20).

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Each figure shows an embodiment of the present invention. The present invention is applied to a driving element such as a power seat slide, and as shown in FIGS. 1 and 2, a gear wheel 10 meshing with an output worm of a driving motor (not shown),
Similarly, a pinion 20 meshes with a rack member to be driven, not shown, and the pinion 20 is fixed to the gear wheel 10 via an interposition member 30.

The pinion 20 includes a rotating shaft 21 and a tooth 2
2 and a crimped portion 23 formed by cutting down the tip of the tooth portion 22 by a certain depth in a direction parallel to the rotation axis.

The interposed member 30 has a swaging hole 31 for press-fitting the swaged portion 23. The caulking hole 31 is smaller than the outer peripheral shape of the caulked portion 23. 3 radially around the caulking hole 31
One mounting projection 32 and one detent projection 33 are protruded.

Mounting projection 32 and rotation stopping projection 33
Are screwed with screw holes 34 respectively. The rotation stopping projection 33 is formed wider than the mounting projection 32 and has an identification hole 36 for distinguishing from the mounting projection 32.

When the rotating shaft portion 21 of the pinion 20 is press-fitted into the caulking hole 31 of the interposition member 30 and caulked,
The rotary shaft portion 21 is fitted so as to be relatively non-rotatable and unmovable in a protruding state.

The gear wheel 10 is formed of a resin material, and has a fitting hole 12 into which the rotating shaft portion 21 of the protruding pinion 20 is directly fitted with a determined axis, and a mounting projection 32.
Has a loose fitting groove 14 into which the protrusions 33 are loosely fitted, and a press-fitting groove 16 into which the projection 33 for locking is fitted and becomes relatively non-rotatable. The loose fitting groove 14 and the press-fit groove 16 have substantially the same shape.

Mounting projection 32 and rotation stopping projection 33
Is formed to have the same width, the press-fit groove 16 may be formed narrower than the loose fitting groove 14 so that the press-fit groove 16 is provided with an identification mark.

The loose fitting groove 14 and the press-fitting groove 16 have screw holes 3
4, an insertion hole 18 through which the pan screw 40 is inserted is formed. Since it is not necessary to use a countersunk screw to prevent backlash in the rotational direction, a general pan screw 40 is sufficient.

Next, the operation will be described. The pinion 20 is fixed with a jig, and the caulking hole 31 of the interposition member 30 is made to correspond to the rotation shaft 21 of the pinion 20.
Is relatively fitted in the caulking hole 31. As a result, the swaged portion 23 of the pinion 20 is pressed into the swaging hole 31 of the interposition member 30, and the pinion 20 is pressed.
In a state where the rotation shaft portion 21 is protruded, the rotation shaft portion 21 becomes relatively unable to rotate and cannot come off, and the interposition member 30 and the pinion 20 are assembled.

Next, as shown in FIGS. 1 and 2, the rotating shaft portion 21 of the pinion 20 and the fitting hole 12 of the gear wheel 10 in the protruding state are opposed to each other so that the rotating shaft portion 2
1 is directly fitted into the fitting hole 12. If the accuracy of the single component between the gear wheel 10 and the pinion 20 is set within an allowable error because the rotary shaft portion 21 is directly fitted into the fitting hole 12, the single component of the interposition member 30 is not affected by the single component accuracy. The centering of the rotary shaft 21 of the pinion 20 can be easily performed.

Before and after, the protrusion 33 for stopping rotation of the interposition member 30 is firmly fitted into the press-fit groove 16 of the gear wheel 10, so that the interposition member 30 and the gear wheel 10 cannot relatively rotate. As a result, rattling of the interposition member 30 in the rotation direction is eliminated. Since the rotation shaft portion 21 of the pinion 20 is relatively non-rotatably mounted on the interposition member 30, the pinion 20 can be mounted relatively non-rotatably on the gear wheel 10.

In addition, since the mounting projection 32 is loosely fitted in the loose fitting groove 14, only the fitting relationship between the detent projection 33 and the press-fitting groove 16 needs to be considered, and the fitting operation becomes easy. .

Next, the pot screw 40 is passed through the insertion hole 18 to
By screwing into the screw hole 34, the interposition member 30 is attached to the gear wheel 10. Detent 33 and press-fit groove 1
6, the rattling of the gear wheel 10 in the rotation direction is prevented, so that it is not necessary to tighten the pan screw 40 tightly, and the tooth portion of the gear wheel 10 near the pan screw 40 is not deformed. Can be properly engaged with a rack (not shown).

In the above embodiment, the gear wheel 10
Although the press-fit groove 16 is provided on the side and the projection 33 for stopping rotation is provided on the interposition member 30 side, a press-fit portion is provided on the gear wheel 10 side, and the press-fit portion is press-fit on the interposition member 30 side. A groove for stopping the fitting may be provided.

Also, screw holes 34 are screwed into the mounting projections 32, the rotation stopping projections 33 and the like.
A projection may be separately provided, and the screw hole 34 may be screwed into the projection.

[0025]

According to the drive element of the power unit for an automobile according to the present invention, when the rotation shaft of the pinion is fitted into the caulking hole of the interposition member, the rotation shaft of the pinion is relatively protruded. The rotation shaft portion of the pinion in the protruding state is directly fitted into the fitting hole of the gear wheel, so that the pinion can be easily formed regardless of the shape accuracy of the interposition member. Centering of the rotating shaft can be performed. In addition, the detent part of the interposition member,
When the press-fit portion of the gear wheel is press-fitted, the interposition member and the gear wheel become relatively unrotatable, and there is no backlash in the rotation direction of the interposition member. In order to assemble without looseness, for example, there is no need to tighten a countersunk screw or the like tightly, and the teeth of the gear wheel are not deformed, mesh properly, and no abnormal noise is generated.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a driving element according to an embodiment of the present invention.

FIG. 2 is a partially exploded front view of a driving element showing one embodiment of the present invention.

FIG. 3 is a bottom view of the gear wheel according to the embodiment of the present invention;

FIG. 4 is a plan view of an interposition member and a pinion showing one embodiment of the present invention.

FIG. 5 is a plan view of an interposition member showing one embodiment of the present invention.

FIG. 6 is a plan view of a pinion showing one embodiment of the present invention.

FIG. 7 is a side view of the pinion showing one embodiment of the present invention.

FIG. 8 is a partially exploded perspective view of a driving element showing a conventional example.

FIG. 9 is a partially exploded front view of a driving element showing a conventional example.

FIG. 10 is a partial sectional view of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Gear wheel 12 ... Fitting hole 14 ... Free-fitting groove 16 ... Press-fitting groove (press-fitting part) 20 ... Pinion 21 ... Rotation shaft part 30 ... Intermediate member 31 ... Hole for caulking 32 ... Projection for mounting 33 ... Protrusion for locking 34 ... Screw hole

Claims (2)

(57) [Scope of request for utility model registration] 1. A driving element of an automobile power unit for transmitting power to a driving object via a gear wheel and a pinion, wherein the pinion is fixed to the gear wheel via an interposition member. The member includes a caulking hole which is relatively non-rotatably and irremovably fitted with the pinion's rotation shaft protruding, and a detent portion extending radially around the caulking hole. The gear wheel has a fitting hole in which the rotating shaft portion of the pinion in the protruding state determines an axis and directly fits, and the rotation preventing portion is press-fitted and relatively unable to rotate. A driving element for a power unit for a vehicle, comprising: a press fitting portion. 2. A driving element of a power unit for an automobile, which transmits power to a driving object via a gear wheel and a pinion, wherein the pinion is fixedly mounted on the gear wheel via an interposition member. The member includes a caulking hole which is relatively non-rotatably and irremovably fitted in a state where the rotation shaft portion of the pinion is protruded, and a detent projection protruding radially about the caulking hole. The gear wheel has a fitting hole into which the rotating shaft portion of the pinion in the protruding state determines an axis and directly fits, and the rotation-preventing projection is press-fitted and relatively rotated. A drive element for a power unit for a motor vehicle, comprising: a press-fit groove that becomes impossible.