JPS61129463A - Starter - Google Patents

Abstract

PURPOSE:To prevent the intrusion of water into between a pinion and a tube and reduce the number of parts by removing a cap by arranging the cylinder part of a cover fixed onto the tube onto the inner periphery of the hollow part of the pinion into which a driving shaft is arranged. CONSTITUTION:When the captioned starter is put into operation, the plunger 7 of a magnet switch is attracted, and the pinion 9 of a shaft 8 is shifted to a ring gear 6 side. When a movable contact-point 7b contacts with a fixed contact-point, terminals 14 and 15 conduct, and a starter motor 2 revolves. Then, the turning moment is decelerated through an idle gear 20, and transmitted to a clutch outer 10, tube 3, and the pinion 9. In this case, the intrusion of water and oil onto the outer periphery of the shaft 8 from between the pinion 9 and the tube 3 by the cylinder part 16a of a cover. Further, the hollow part 9b of the pinion 9 in which a drive spring 11 is arranged is utilized as the accommodation place for the cylinder part 16a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a waterproof structure in a starter for starting an engine.

[Conventional technology]

As shown in Japanese Unexamined Patent Application Publication No. 59-141768, the conventional type has a cylindrical prong at the tip of the pinion, and the brim enters the cap fixed to the shaft through a gap, so that the gap between the cap and the brim is This creates a labyrinth to prevent water from entering the shaft between the cap and pinion.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional device, in order to form the maze with the tail of the pinion, it is necessary to fix a cap, which is a separate member, to the tip of the shaft, resulting in a problem that the number of parts increases.

Therefore, the present invention provides waterproofness between the pinion and the cover without increasing the number of parts by arranging the cylindrical part of the cover fixed to the tube in the hollow part of the pinion where the drive spring is arranged. measure.

[Means for solving problems]

A tube to which rotation of the starter motor is transmitted and axial movement is restricted; a shaft spline-coupled to the inner periphery of this tube; serrations coupled to the outer periphery of the end of this shaft, and to the inner periphery of the tube side; a pinion formed with a cylindrical hollow part that meshes with a ring gear of the engine and transmits the rotation of the tube via the shaft; and a drive spring installed between the hollow part of the pinion and the shaft. a magnetic switch for moving the shaft toward the ring gear; a cylindrical portion fixed to the tube and substantially abutting the outer periphery of a hollow portion of the pinion; The starter includes a cover in which a gap between the tube-side end surface of the pinion and the pinion-side end surface of the tube is smaller than the axial length of the cylindrical portion.

[Effect]

The hollow part of the pinion where the drive spring is located is used to locate the cylindrical part of the cover fixed to the tube.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

As shown in FIGS. 1 and 2, 1 is a magnet switch, and 2 is a starter motor. A plunger 7 coaxially connected to a shaft 8 is disposed within the magnetic switch 1 . Furthermore, a movable contact 7b is provided at one end of the plunger 7. A helical spline 8a is formed on the plunger 7 side of the shaft 8, and the tube 3 is splined to the outer periphery of the helical spline 8a. Both ends of the tube 3 are rotatably held in the housing 4 via bearings 5. Furthermore, movement of the tube 3 in the axial direction is restricted. The clutch outer lO, which has the roller 10b inserted into its inner periphery, is connected to the outer periphery of the tube 3 via a bearing.
It is located. Further, a gear 10a is formed on the outer periphery of the clutch outer 10. Then, the rotation of the starter motor 2 is transmitted to the gear 10a via the idle gear 20.
I can tell you. A return spring 22 is installed between the tube 3 and the shaft 8. Further, a serration 78b is formed at the tip of the shaft 8, and a pinion 9 is connected to the serration 8b. Teeth 9a that mesh with the ring gear 6 of the engine are formed on the outer periphery of the pinion 9, and a cylindrical hollow portion 9b is formed on the inner periphery on the tube 3 side.

A drive spring 11 is arranged between the hollow portion 9b and the shaft 8. Further, one end of the drive spring 11 is restricted from moving in the axial direction by the shaft 8 via the washer 12. Stopper 13
is for regulating the movement of the pinion 5 in the axial direction.

14.15 is a terminal having a fixed contact that comes into contact with the movable contact 7b. The cover 16 includes a hollow portion 9b of the pinion 9.
a first cylindrical portion 16a that substantially contacts the outer periphery of the first cylindrical portion 16a;
On the tube 3 side of the cylindrical portion 16a, there is a second cylindrical portion 16b that is slightly smaller than the outer circumferential diameter of the tube 3, and a collar portion 16 that protrudes from the end of the second cylindrical portion 16b toward the outer circumferential blade side.
It is composed of C. Then, the second cylindrical portion 16b of the cover 16 is press-fitted into the end of the tube 3. One end of the shield plate 17 is rotatably held between the bearing 5 and the housing 4, and the other end is attached to the tail portion 16 of the cover 16.
c and the outer periphery of the second cylindrical portion 16b.

As shown in FIGS. 2 and 3, the axial length 11 of the first cylindrical portion 16a of the covertro is stored in the hollow portion 9b of the pinion 9 when not in operation, and the pinion 9
When the ring gear 6 and the ring gear 6 are in mesh with each other, the distance e2 between the end surface of the pinion 9 on the tube 3 side and the end surface of the tube 3 on the pinion 9 side is longer.

Next, to explain the operation in the above configuration, when the starter switch is turned on, the plunger 7 of the magnetic switch is attracted, bending the return spring 22, and moving the pinion 9 of the shaft 8 toward the ring gear 6. . When the pinion 9 substantially contacts the ring gear 6, the movable contact 7b contacts the fixed contact. Then, the terminals 14 and 15 are made conductive, and the starter motor 2 is rotated. Further, the rotation of the starter motor 2 is decelerated and transmitted to the clutch outer 10 via the idle gear 20. Further, the rotation is transmitted to the roller 10b, tube 8, and pinion 9. Then, the drive spring 11 is deflected, the pinion 9 and the ring gear 6 mesh with each other, and the rotation of the pinion 9 is transmitted to the ring gear 6, thereby starting the engine.

Therefore, the first cylindrical portion 16a of the cover 16 allows water to flow from between the pinion 9 and the tube 3 to the outer periphery of the shaft 8.
It can prevent oil etc. from entering, and the first cylindrical part 16
Since the drive spring 11 is placed in the storage location a and the hollow portion 9b of the pinion 9 is effectively utilized, the number of parts does not increase. Furthermore, the shield plate 17
This prevents water, oil, etc. from entering between the bearing 5 and the housing 4 and between the bearing 5 and the tube 3. Since the cover 16 rotates together with the tube 3, there is no difference in rotation between the cover 16 and the pinion 9, and the cover 16 will not be worn out by the pinion 9.

The second cylindrical portion 16b of the cover 16 is held by press-fitting into the tube 3, etc., but as long as the pinion 9 can slide on the cover 16 and does not pass through the shield plate 17, the second cylindrical portion 16b will be held in place even if it is not press-fitted. There is an effect.

Further, the cover 16 may be formed integrally with the end of the tube 3.

Furthermore, the present invention can also be applied to a starter in which the pinion 9 and the starter motor 2 are arranged coaxially, and the pinion 9 is moved via a lever by means of a magnetic switch 1 arranged in parallel with the starter motor 2.

〔Effect of the invention〕

As described above, in the present invention, the cylindrical part of the cover fixed to the tube is arranged on the inner periphery of the hollow part of the pinion where the drive shaft is arranged, thereby increasing the waterproofness between the pinion and the tube. This has the advantage of being able to eliminate the conventionally required cap, reduce the number of parts, and reduce the size in the axial direction.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing an embodiment of the starter of the present invention, FIG. 2 is a half sectional front view showing the main parts when the pinion shown in FIG. 1 is not in operation, and FIG. FIG. 3 is a half-sectional front view showing the main parts when the pinion and ring gear are engaged with each other. 1...Magnetic switch, 2...Starter motor. 3...Tube 26...Ring gear +, 8...Shaft. 8b... Serration, 9... Pinion, 9b River cavity, 11... Drive spring, 16... Cover. 16a...first cylindrical part.

Claims (1)

[Scope of Claims] A tube through which rotation of a starter motor is transmitted and axial movement is regulated; A shaft spline-coupled to the inner periphery of the tube; A serration-coupled shaft coupled to the outer periphery of an end of the shaft; A pinion having a cylindrical hollow part formed on the inner periphery of the side, which meshes with the ring gear of the engine and transmits the rotation of the tube via the shaft; and between the hollow part of the pinion and the shaft. a drive spring attached to the pinion; a magnetic switch for moving the shaft toward the ring gear; a cylindrical portion fixed to the tube and substantially in contact with the outer periphery of the hollow portion of the pinion; A starter comprising: a cover that makes a gap between the tube-side end surface of the pinion and the pinion-side end surface of the tube smaller than the axial length of the cylindrical portion when the pinions are engaged with each other.