JPH02168032A - Spring shield for starter-driving - Google Patents

Abstract

PURPOSE: To make improvements in the performance of a starter driver through a simple means by installing a shield for a rectangular spring of this starter driver. CONSTITUTION: A spring 17 is bent inward and scrubs the cylindrical surface of a driving member 5, whereby this spring 17 is worn out. In order to avoid causing this fact, a spring shield 20 is formed so as to make a projection 23 be connected to a surface 21 at such an angle as tilted as far as a minute angle from a right angle to this surface 21. At this time, the shield 20 is installed so as to make the surface 21 face somewhat inward toward the driving member 5, and thus this spring 17 is bent toward the outside, whereby such a possibility that it might scrub the cylindrical surface of the driving member 5 is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a starter drive for an internal combustion engine, and more particularly to a shield for a rectangular spring in said starter drive.

[Prior Art 1] Standard internal combustion engines are generally manufactured by U.S. Pat.
It utilizes an electric starter motor with a starter drive having a roller overrunning clutch arrangement of the type referenced by No. 6. Such starter drives include a pinion gear for engaging the flywheel of the engine to be started. The starter drive has a sleeve mounted on the output/yaft of the starter motor and connected to the drive of the clutch. The drive part of the clutch is connected to a pinion gear. The drive portion of the clutch has an annular shape surrounding the drive member and is mounted concentrically with the drive member. A number of cylindrical rollers are housed in each tapered recess formed in the drive member. When the drive member is rotated by the starter motor, each roller is pushed into the four walls and the outer cylindrical surface of the drive member, and from the pushed position by a rectangular spring when the pinion gear overtakes the drive member. Forced to leave. In this way, when the starter motor is engaged with the flywheel of the engine to be started, said starter motor can drive the pinion gear, but when the engine rotation is started, the 7 line It allows the wheel to overtake the starter motor. A plurality of rectangular rather than circular springs is required to effectively engage the sides of the cylindrical roller.

The most common reason for failure of such starter drives is failure of the rectangular spring. The fact that the spring is bent at a certain angle under a certain pressure will eventually lead to failure of the spring and stop the operation of the starter drive, which will further damage the starter motor, Generally requires repair or replacement of the starter drive. No. 3,820,406 to Turrier proposes replacing the rectangular springs with a pair of circular springs used in conjunction with a guide and a base plate. However, such a design cannot be used with the existing springs of standard starter drives.

Also, it requires at least four parts to replace each spring. Therefore, a simple means is needed to improve the performance of rectangular springs in existing starter drives.

[Means for Solving the Problems 1] The present invention provides a seventh lead for a rectangular spring of a starter drive. The shield has a rectangular surface sized to slightly overlap the edges of the rectangular spring, and an end portion of the rectangular spring connected to the surface to accurately position the shield. and an extension section for insertion into the.

The expanded portion may be connected to the surface at a right angle or at an angle slightly inclined from the right angle.

[Example 1] Hereinafter, an example according to the present invention will be described with reference to the drawings.

In FIG. 1, the starter drive is designated at 1. The pinion gear 3 is connected to the drive member 5 of the clutch 7. The drive member of the clutch 9 forms an annular coupling ring around the drive member.

Furthermore, said drive part 9 is connected to a hollow sleeve 10 which is screwed onto the drive shaft of the starter motor.

In FIG. 2, four tapered recesses 15 are formed in the drive member 9. In FIG. Cylindrical steel roller 1
6 is located in each tapered recess. A spring 17 wound in a rectangular shape urges each roller 16. Each of the four springs 17 is located in each recess 18 bent at a predetermined angle, one end of each spring 17 biases the wall 19 of the recess 18, and the other end biases the roller 16. . When the drive member 9 is rotated in the direction indicated by arrow A, the roller 16 is forced between the wall of the recess 15 and the outer cylindrical surface of the drive member 5, thereby causing the pinion gear 3 to rotate. When the pinion gear 3 overtakes the rotation of the drive member 9, that is, when the drive member 9 rotates relative to the direction opposite to the direction A when viewed from the pinion gear 3, each spring 17 is connected to a cylindrical roller 16. counterclockwise towards the drawing towards the wider portion of each recess 15, thereby disengaging the pinion gear 3 from the drive member 9 and allowing it to rotate freely.

A spring shield according to the present invention is indicated at 20 in FIGS. 2, 3, and 4.

The spring shield 20 consists of a rectangular surface 21 and an expanded protrusion 23 attached to the surface 21 orthogonally to the surface 21 . As shown in FIG. 4, a rectangular surface 21
is formed such that the rectangular surface 21 overlaps the edge of the rectangular spring 17. Similarly, the rectangular projection 23 is sized such that it fits within the central opening formed by the spring 17. The shield 20 may be formed of copper or some other durable metal or synthetic material. However, the material of the shield 20 needs to be a softer material than the roller 16, which is typically made of steel. It is also important that the protrusion 23 is not so long that the bottom of the protrusion 23 "reaches the bottom" of the spring 17 when the spring 17 is bent to its limit. Generally, the shield 20 will be sized such that there is approximately 1/8 inch clearance between the end of the protrusion 23 and the wall 19 when the spring 17 is unflexed. Dew. Similarly, the rectangular surface 21 is no wider than the diameter of the roller 16. Preferably also, the height of the rectangular surface 21 is the same as that of the roller 16.

In nine configurations, the spring 17 will bend inward and rub against the cylindrical surface of the drive member 5. This causes the spring to wear out. In order to avoid this problem, the spring shield 20 may be formed such that the protrusion 23 is connected to the surface 21 at an angle that is inclined by a small angle from a right angle to the surface 21.

At this time, the shield 20 is mounted so that the surface 21 faces slightly inward toward the drive member 5, and the spring 17 is bent outward, thereby causing the spring 17 to touch the cylindrical surface of the drive member 5. Avoid rubbing.

When the starter drive is disassembled, a spring shield 20 is placed at the end of each spring 17. The overrunning flange is installed in the usual manner with good quality grease.

As will be apparent to those skilled in the art from the foregoing disclosure, many modifications are possible in carrying out the invention without departing from the scope of the invention. Interpreted according to the device defined by the range.

[Brief explanation of the drawing]

Fig. 1 is a front view of a starter drive device that is an embodiment of the present invention, Fig. 2 is a side view of the starter drive device of Fig. 1 showing an overrunning clutch structure, as seen from the right end, and Fig. 3 is a view of the present invention. FIG. 4 is a perspective view of one embodiment of the spring nord; FIG. 4 is a side view from the end of the spring shield of FIG. 3 with a rectangular spring; DESCRIPTION OF SYMBOLS 1... Starter drive device, 3... Pinion gear 5... Drive member, 7... Clutch, 9... Drive member, 0... Hollow sleeve, 5... Tapered recessed portion 15. 6... Roller 7... Spring, butt... Recessed part, 9... Wall part, 0... Spring shield, l... Rectangular surface, 3... Protrusion part.

Claims (6)

[Claims] (1) a shield for a rectangular spring of a starter drive in which the spring is associated with a cylindrical roller; (b) a protrusion connected to the surface and sized to be received in the central opening of one end of the spring; Shield. (2) a driving member having a cylindrical outer surface and concentric with the driven member and mounted around the driven member; and a cylindrical shape housed in each recess formed in the driving member. A starter drive for an internal combustion engine having an overrunning clutch with a plurality of rollers, each roller being biased by a rectangular spring located between the end of the spring and the surface of the roller. A device characterized by being equipped with a shield made of durable material. (3) The shield includes: (a) a rectangular surface having a size larger than or equal to the rectangular cross-section of the spring and made of a material softer and more durable than the roller; (b) the above-mentioned 3. The device of claim 2, further comprising a protrusion connected to the surface and sized to be received in a central opening at one end of the spring. 4. The apparatus of claim 3, wherein said shield is made of copper. 5. The device of claim 3, wherein said protrusion is connected at right angles to said surface. 6. The device of claim 3, wherein the protrusion is connected to the surface at an angle slightly more than perpendicular.