JP3873705B2 - Starter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a starter having a one-way clutch, and more particularly to a starter having a foreign matter intrusion prevention cover fixed to a one-way clutch.
[0002]
[Prior art]
Conventionally, for example, as shown in FIG. 5, an inertia dive starter in which a pinion gear 6 moves on an output shaft 4 integrally with a one-way clutch 7 and meshes with an engine ring gear is known.
The starter is provided with a foreign matter intrusion prevention cover 11 for preventing foreign matter and the like entering the housing 5 from entering the motor side through the radially outer side of the one-way clutch 7. The foreign matter intrusion prevention cover 11 is fixed to the clutch cover 7H of the one-way clutch 7 by spot welding at several points, as shown in FIGS.
[0003]
[Problems to be solved by the invention]
However, in the starter described above, the spot welding spot 11 for the foreign matter intrusion prevention cover 11 is randomly arranged with respect to the outer cover 7B of the one-way clutch 7 in the clutch cover 7H. For example, as shown in FIG. May be disposed close to the roller sliding surface 7a of the outer 7B. In this case, when torque is transmitted from the outer 7B to the inner 7C via the roller 7D, the roller 7D presses the roller sliding surface 7a of the outer 7B, so that the outer 7B is deformed in the outer diameter direction at the pressing portion. Along with the deformation, stress is applied to the welded portion. As a result, when the welding strength is insufficient, the foreign matter intrusion prevention cover 11 may fall off the clutch cover 7H.
[0004]
The present invention has been made based on the above circumstances, and the purpose of the present invention is that when torque transmission is performed by a one-way clutch in a starter in which a foreign matter intrusion prevention cover is fixed to the clutch cover of the one-way clutch. The object is to reduce the stress applied to the fixed part of the foreign matter intrusion prevention cover and prevent the foreign matter intrusion prevention cover from falling off.
[0005]
[Means for Solving the Problems]
(Invention of Claim 1)
The starter of the present invention has a foreign matter intrusion prevention cover fixed to the clutch cover of the one-way clutch in order to prevent foreign matters from entering the motor side from the pinion gear side through the radially outer side of the one-way clutch. The one-way clutch is provided between the outer and the clutch cover with positioning means for disposing the fixing portion of the foreign matter intrusion prevention cover with respect to the clutch cover at a position shifted in the circumferential direction from the roller sliding surface of the outer . The clutch cover is provided with a positioning portion for positioning the fixing portion of the foreign matter intrusion prevention cover .
[0006]
According to this configuration, since the fixing portion of the foreign matter intrusion prevention cover with respect to the clutch cover can be arranged at a position shifted in the circumferential direction from the roller sliding surface of the outer by the positioning means, torque is transmitted via the one-way clutch. In this case, the stress applied to the fixed portion of the foreign matter intrusion prevention cover can be reduced. As a result, the foreign matter intrusion prevention cover can be prevented from falling off the clutch cover.
Also, when fixing the foreign matter intrusion prevention cover to the clutch cover, it can be fixed according to the positioning part provided on the clutch cover, so it is securely fixed at a position shifted in the circumferential direction from the outer roller sliding surface. The part can be arranged.
[0008]
(Invention of Claim 2 )
The starter according to claim 1 ,
The positioning part of the clutch cover functions as positioning means provided between the clutch cover and the outer.
Since the clutch cover is arranged between the outer and the foreign matter intrusion prevention cover, it is necessary to provide positioning means for the outer and a positioning portion for the foreign matter intrusion prevention cover, but it is not necessary to separately provide both of them. , You can share them into one.
[0009]
(Invention of Claim 3 )
The starter according to claim 1 or 2 ,
The foreign matter intrusion prevention cover is provided with a positioning portion corresponding to the positioning portion of the clutch cover.
As a result, the positioning portion of the foreign matter intrusion prevention cover can be aligned and fixed to the positioning portion of the clutch cover, so that the fixing portion can be more reliably disposed at a position shifted in the circumferential direction from the roller sliding surface of the outer. it can.
[0010]
(Invention of Claim 4 )
The starter according to any one of claims 1 to 3 ,
The positioning means on the outer side is provided on the outer diameter side of the portion where the spring for biasing the roller is disposed.
In this case, since the positioning means can be provided at a position away from the roller sliding surface, deformation of the roller sliding surface due to the positioning means can be prevented.
[0011]
(Invention of Claim 5 )
The starter according to any one of claims 1 to 4 ,
The fixing part of the foreign matter intrusion prevention cover with respect to the clutch cover is arranged at the thickest part of the outer.
According to this configuration, when torque transmission is performed by the one-way clutch, the foreign matter intrusion prevention cover is fixed even when the roller presses the roller sliding surface and the outer deforms in the outer diameter direction at the pressed position. Excessive stress is not applied to the portion, and the foreign matter intrusion prevention cover can be prevented from falling off.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is an axial front view showing a welded portion of a foreign matter intrusion prevention cover, and FIG. 2 is a cross-sectional view of a pinion moving body cut in a radial direction.
As shown in FIG. 5, the starter 1 of this embodiment includes a motor 2 that generates a rotational force, an electromagnetic switch 3 that controls ON / OFF of the energization current of the motor 2, and an output shaft 4 that is driven by the motor 2 and rotates. The pinion moving body (described below) provided so as to be movable in the axial direction on the output shaft 4 is configured.
[0013]
The motor 2 is a well-known DC motor. When a motor contact (not shown) is closed by the electromagnetic switch 3, the motor 2 is energized to generate a rotational force in the armature.
The electromagnetic switch 3 has an exciting coil (not shown) that is energized when the IG key is turned on, and a plunger (not shown) that is slidably fitted on the inner periphery of the exciting coil. Along with this, the motor contacts are opened and closed.
[0014]
The output shaft 4 is provided, for example, by extending the rotation shaft (armature shaft) of the motor 2 (or connected to the armature shaft via a speed reducer), and its tip end is a housing via a bearing (not shown). 5 is rotatably supported.
The pinion moving body includes a pinion gear 6 and a one-way clutch 7, and is connected to a plunger of the electromagnetic switch 3 through a lever 8.
The pinion gear 6 is disposed on the front side (left side in FIG. 2) of the one-way clutch 7, and is fitted to the outer periphery of the output shaft 4 via a bearing 9 (see FIG. 2) so as to be rotatable and slidable.
[0015]
As shown in FIGS. 1 and 2, the one-way clutch 7 is provided integrally with a cylindrical barrel 7A that is helically splined to the output shaft 4, an outer 7B that is provided integrally with the barrel 7A, and a pinion gear 6. The inner 7C fitted to the output shaft 4 via the bearing 10, the roller 7D interposed between the outer 7B and the inner 7C, the spring 7E for urging the roller 7D, and the washer for preventing the roller 7D from coming off. 7F, a half washer 7G for preventing the inner 7C from coming off, and a clutch cover 7H that holds the half washer 7G and covers the outer periphery of the outer 7B.
[0016]
A foreign matter intrusion prevention cover 11 having an annular shape larger than the outer diameter of the clutch cover 7H is fixed to the one-way clutch 7.
The foreign matter intrusion prevention cover 11 prevents foreign matter from entering the motor 2 side from the pinion gear 6 side through the radially outer side of the one-way clutch 7, and is fixed to the gear side end surface of the clutch cover 7H by spot welding. In addition, as shown in FIG. 5, intrusion of foreign matters is prevented in cooperation with the rubber sealing material 12.
[0017]
The foreign matter intrusion prevention cover 11 is spot-welded to the clutch cover 7H at a plurality of locations (five locations in FIG. 1) in the circumferential direction, and the welded locations 13 are circumferential from the roller sliding surface 7a of the outer 7B. (In this embodiment, the outermost portion of the outer wall 7B has the largest thickness). As means for realizing this, positioning portions are provided on the three sides of the outer 7B, the clutch cover 7H, and the foreign matter intrusion prevention cover 11, respectively. As shown in FIG. 1, the roller sliding surface 7a of the outer 7B refers to an inner peripheral surface on which the roller 7D can slide in a recess in which the roller 7D is disposed.
[0018]
As shown in FIG. 4, the positioning portion 7 b of the outer 7 </ b> B is recessed at one place on the outer diameter portion of the end surface of the outer 7 </ b> B. However, the positioning portion 7b is set on the outer diameter side of the portion where the spring 7E is disposed.
The positioning portion 7c of the clutch cover 7H is provided so as to be recessed toward the inside of the cover at a position corresponding to the positioning portion 7b of the outer 7B (see FIG. 3).
The positioning portion 11a of the foreign matter intrusion prevention cover 11 is provided to protrude toward the clutch cover 7H at a position corresponding to the positioning portion 7c of the clutch cover 7H (see FIG. 3). Further, in this foreign matter intrusion prevention cover 11, a welded portion 13 with respect to the clutch cover 7H is specified in advance with reference to the positioning portion 11a.
[0019]
Next, the operation of the starter 1 of this embodiment will be described.
When the IG key is turned ON, the excitation coil of the electromagnetic switch 3 is energized and the plunger is attracted. Therefore, the pinion moving body connected to the plunger via the lever 8 is in front of the shaft (left direction in FIG. 5). Pushed out. As a result, the pinion moving body moves forward on the output shaft 4 and the pinion gear 6 contacts an engine ring gear (not shown).
[0020]
Thereafter, when the plunger further moves and the motor contact is closed, the motor 2 is energized to generate a rotational force in the armature, and the output shaft 4 rotates in response to the rotation of the armature. As a result, when the pinion gear 6 is rotated to a position where it can mesh with the ring gear in response to the rotation of the output shaft 4, the pinion gear 6 is pushed in to complete the meshing with the ring gear, and the rotation of the output shaft 4 is transmitted from the pinion gear 6 to the ring gear. To crank the engine.
[0021]
After the engine is started, when the IG key is turned OFF and the energization of the exciting coil is stopped and the magnetic force of the exciting coil disappears, the plunger is pushed back, and the pinion moving body is pulled back to the rear of the shaft as the plunger moves. As a result, the pinion gear 6 is detached from the ring gear and returned to the position before starting. Further, since the motor contact opens as the plunger moves, the energization to the motor 2 stops and the rotation of the armature stops.
[0022]
Next, functions and effects according to the present invention will be described.
The starter 1 of this embodiment has a foreign matter intrusion prevention cover 11 fixed to the clutch cover 7H of the one-way clutch 7 by spot welding, and the welded portion 13 of the foreign matter intrusion prevention cover 11 is a roller slide of the outer 7B. Positioning portions 7b, 7c, and 11a are provided on the three sides of the outer 7B, the clutch cover 7H, and the foreign matter intrusion prevention cover 11 so that they can be arranged at positions displaced from the surface 7a in the circumferential direction.
[0023]
As shown in FIG. 3, the clutch cover 7H and the foreign matter intrusion prevention cover 11 are spot-welded at a welding location 13 specified in advance with the positioning portions 11a and 11a as a reference in a state where the positioning portions 7c and 11a are combined. I do. Thereafter, as shown in FIG. 4, the positioning portion 7c of the clutch cover 7H is aligned with the positioning portion 7b of the outer 7B, and the outer cover 7B is covered with the clutch cover 7H, so that the foreign matter intrusion prevention cover 11 is welded to the clutch cover 7H. 13 can be arranged at a position displaced from the roller sliding surface 7a of the outer 7B.
[0024]
Thereby, when torque is transmitted through the one-way clutch 7, even when the roller 7D presses the roller sliding surface 7a and the outer 7B is deformed in the outer diameter direction at the pressed position, foreign matter intrusion prevention is prevented. Excessive stress is not applied to the welded portion 13 of the cover 11, and the foreign matter intrusion prevention cover 11 can be prevented from falling off from the clutch cover 7H.
Further, according to the configuration of this embodiment, the half washer 7G can be positioned by the positioning portion 7c provided in the clutch cover 7H.
[0025]
(Second embodiment)
The present embodiment is an example in which the positioning portion 7b of the outer 7B has a convex shape.
As shown in FIG. 7, the positioning portion 7b of the outer 7B is provided so as to protrude from the end surface of the outer 7B to the pinion gear 6 side.
The positioning portion 7c of the clutch cover 7H is provided in a hole shape that fits with the positioning portion 7b of the outer 7B.
The positioning part 11a of the foreign matter intrusion prevention cover 11 is provided in a hollow shape that can be engaged with the tip of the positioning part 7b of the outer 7B.
[0026]
Also in the configuration of the present embodiment, similarly to the first embodiment, the welded portion 13 of the foreign matter intrusion prevention cover 11 with respect to the clutch cover 7H can be disposed at a position displaced from the roller sliding surface 7a of the outer 7B (FIG. 6).
Further, the half washer 7G can be positioned by the positioning portion (convex portion) 7b of the outer 7B.
[0027]
(Modification)
In the above embodiment, the positioning portions 7b, 7c, and 11a are provided for the outer 7B, the clutch cover 7H, and the foreign matter intrusion prevention cover 11, respectively. However, the positioning portion 11a of the foreign matter intrusion prevention cover 11 may be eliminated. Is possible. For example, if the mark corresponding to the welding location 13 is attached to the clutch cover 7H and spot welding is performed in accordance with the mark, the foreign matter intrusion prevention cover 11 may not be provided with the positioning portion 11a.
[Brief description of the drawings]
FIG. 1 is an axial front view (including a partial cross section) showing a welding location of a foreign matter intrusion prevention cover (first embodiment).
FIG. 2 is a cross-sectional view of a pinion moving body cut in a radial direction (first embodiment).
FIG. 3 is a sectional view of a clutch cover and a foreign matter intrusion prevention cover (first embodiment).
FIG. 4 is an axial front view for explaining an outer positioning portion (first embodiment);
FIG. 5 is an overall side view (including a partial cross section) of the starter.
FIG. 6 is an axial front view (including a partial cross section) showing a welding location of a foreign matter intrusion prevention cover (second embodiment).
FIG. 7 is a cross-sectional view of a pinion moving body cut in a radial direction (second embodiment).
FIG. 8 is an axial front view (including a partial cross section) showing a welded portion of a foreign matter intrusion prevention cover (prior art).
FIG. 9 is a cross-sectional view of a pinion moving body cut in a radial direction (prior art).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Starter 2 Motor 6 Pinion gear 7 One-way clutch 7B Outer 7C Inner 7D Roller 7E Spring 7H Clutch cover 7a Roller sliding surface 7b Outer positioning part (positioning means)
7c Clutch cover positioning part (positioning means)
11 Foreign object intrusion prevention cover 11a Foreign object intrusion prevention cover positioning part 13 Welded part (fixed part of foreign object intrusion prevention cover)

Claims (5)

A starter that includes a one-way clutch that transmits torque between an outer and an inner via a roller, and that transmits the rotational force of the motor to the pinion gear via the one-way clutch, the radial direction of the one-way clutch A foreign matter intrusion prevention cover fixed to the clutch cover of the one-way clutch in order to prevent foreign matters from entering the motor side from the pinion gear side through the outside;
In the one-way clutch, positioning means for disposing the fixing portion of the foreign matter intrusion prevention cover with respect to the clutch cover at a position shifted in the circumferential direction from the roller sliding surface of the outer is provided between the outer and the clutch cover. provided between,
The starter according to claim 1, wherein the clutch cover is provided with a positioning portion for positioning a fixing portion of the foreign matter intrusion prevention cover . The starter according to claim 1 ,
The starter according to claim 1, wherein the positioning portion of the clutch cover functions as positioning means provided between the clutch cover and the outer. The starter according to claim 1 or 2 ,
The starter according to claim 1, wherein the foreign matter intrusion prevention cover is provided with a positioning portion corresponding to the positioning portion of the clutch cover. The starter according to any one of claims 1 to 3 ,
The outer side positioning means is provided on an outer diameter side of a portion where a spring for urging the roller is disposed. The starter according to any one of claims 1 to 4 ,
The starter according to claim 1, wherein a fixing portion of the foreign matter intrusion prevention cover with respect to the clutch cover is disposed at a thickest portion of the outer.

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