JPS6179064A - Ring gear made of steel plate - Google Patents

Abstract

PURPOSE:To greatly reduce the number of forming and tooth-cutting steps, by providing a shock countering member having the same tooth form as a ring gear, and by securing the member on the side of the gear. CONSTITUTION:The peripheral portion of a steel disk is bent by a press. The bent peripheral portion of the disk is integrally provided with a teeth 3 by axial press work, the manufacturing a ring gear 6. A shock countering member 4, which is made of a high-strength steel plate and has teeth having an arc angle of 30 deg.-60 deg. and the same from as those of the ring gear 6, is secured to the side of the ring gear by pins or welding. The secured portion of the shock countering member 4 corresponds to the location where a pinion gear is engaged with the ring gear 6 when an engine is started. This constitution greatly reduces the number of forming and tooth-cutting steps.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a ring gear made of a steel plate and used by being attached to a flywheel or the like of an automobile engine.

(Prior art) As the prior art related to the present invention, (al.
No. 7956 "Ring gear mounting device" and middle) Japanese Patent Application Publication No. 1983
-18156 ``Method for manufacturing ring gear'' is published.

Publication (a) above describes a ring gear mounting device that is integrated with a screw provided on the outside of the outer casing on the inside of the ring gear used in automatic transmissions, and is designed to increase the strength of the ring gear. There is an explanation that the thickness in the diametrical direction is increased. In addition, the fb) publication describes a method of manufacturing a ring gear by bending a wire rod into a ring shape, pressing it into a flat shape, welding it, and cutting gears.

Generally, as shown in Fig. 3, the ring gear is manufactured by roll-forming square steel bars into a ring shape A, joining them by flash butt welding B, and then cutting gears C to produce a ring gear D for an automobile. . However, in the conventional ring gear, since high torque is applied when starting the engine, square bar steel is processed into a ring shape and gears are cut over the entire outer periphery, so welding, rectangular cutting and It takes a lot of man-hours to cut the entire surface of the tooth profile, and since the tooth part is cut, the material yield is poor, and there is a limit to the amount of chips generated by gear cutting and weight reduction. Despite the propulsion, there was a problem in that the weight reduction did not progress much.

(Problems to be Solved by the Invention) Therefore, the present invention aims to significantly shorten the number of man-hours for processing and gear cutting in the ring gear installed in an automobile engine, and further improve the material yield, thereby producing a low-cost ring gear. The technical challenge is to manufacture.

[Structure of the invention]

(Means to solve the problem) The technical measures taken to solve the above technical problem are:
The outer periphery of a disc made of a steel plate is bent into a disk shape by press working, and a tooth profile is integrally formed in the axial direction on the outer periphery of the disk shape by press working to form a ring gear, and the peripheral part of the ring gear is The angle of the arc is 30~60'
A shock-resisting member made of super steel and having the same size and tooth profile as the ring gear is fixed to the side of the ring gear by bolts or welding.

The fixed position of the impact counter member is determined by the cycle of the engine equipped with the ring gear and the number of cylinders, and is the position where the pinion gear meshes with the ring gear at the time of engine startup. In a 4-stroke 6-cylinder engine, the pinion gear is fixed at 3 positions around 120° around the ring gear by welding or caulking, so that the pinion gear can easily jump into the surface of the tooth profile of the impact counter member. It has a changing section.

(Operation) The above technical means operates as follows. In other words, the steel plate ring gear that is attached to the engine flywheel is manufactured by press-forming a steel plate into a disc shape and forming tooth profiles in the axial direction on the outer circumferential surface using conventional bending and welding techniques.
Compared to forming by cutting the tooth profile, the number of man-hours is significantly reduced,
The material yield is also good.

In addition, the ring gear is structured so that when the engine starts, the pinion gear engages with the cell morph and rotates the engine, and once the engine rotates, the pinion gear becomes free from the ring gear, so the ring gear is subjected to the greatest impact as it rotates when the engine starts. A force is applied to the engine, and the meshing position of the pinion gear and ring gear at startup is determined by the cycle of the engine and the number of cylinders.

A shock resisting member made of a super steel plate having the same tooth profile is fixed as a reinforcing material for the steel plate ring gear at a position where the pinion gear and the ring gear mesh at the time of starting.

In this way, the steel plate ring gear with the impact-resisting member fixed to the circumferential teeth is able to prevent the ring gear from being damaged even if the cellmorph rotates and the pinion gear jumps in when the engine starts, and high torque is applied to the ring gear. Since the impact counter member is fixed in an arc shape with a constant thickness, no irregularities in tooth profile, breakage, cracking, etc. occur at all.

Regarding the fixing of the impact counter member to the ring gear, when used in a 4-stroke cylinder engine, the starting position of the engine is set at 2 points at 180° on the circumference, and when used in a 4-stroke 6-cylinder engine, at 120° on the circumference. Positions at 3 positions at ° intervals, approximately 30 to 60° in an arc centered at that position
A shock-resisting member of a certain size is good.

In addition, when welding the impact countermeasure member to the side part of the steel plate ring gear, if welding is performed at three or more positions on the circumference depending on the type of engine, the number of parts will increase, and the number of welding locations will also be large. The impact counter member may be formed into a ring shape and one member may be welded to the side portion of the ring gear.

(Example) Examples of the above technical means will be described below.

1 is a circular steel plate, 2 is the circular steel plate formed into a disk shape by press working, and tooth shapes 3 are further press-formed on the outer peripheral surface. Reference numeral 4 denotes a shock-resistant member made of a super steel plate, and is formed with a tooth profile 4a that is the same as the tooth profile of the disk-shaped circumferential portion. 5
a, 5b, . . . show the impact counter member 4 welded to the desk plate.

6 is a ring gear used for 4-stroke 6-cylinder engines, and 12
The impact counter members 7a, 7b, . . . are welded at intervals of 0°, and 8 is a pinion gear rotated by a starter motor (not shown).

(Special effects of the present invention) The present invention has the following specific effects.In other words, as a ring gear for an engine, it is a ring gear that is strong against impact and has extremely low cost. By changing only the opposing member, it is possible to correspond to the output of all engines, and it is also possible to achieve a significant weight reduction.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of this example, (a) is a cross-sectional view of a steel plate, (b) is a partially omitted cross-sectional view of this example, and (c) to (d) are (b). FIG. FIG. 2 is a plan view of another embodiment. FIG. 3 is an explanation of a conventional example, in which (a) is a perspective view before gear cutting, and (b) is a perspective view after gear cutting. 1... Steel plate, 2... Disk-shaped gear, 3... Tooth profile,
4, 7... Shock counter member, 6... Ring gear

Claims (3)

[Claims] (1) In a ring gear made of a steel plate that is installed in an automobile engine, a shock-resisting member having the same tooth profile as the ring gear is installed so that the position where the ring gear and pinion gear mesh when the engine is started depends on the engine cycle and the number of cylinders. A ring gear made of a steel plate, in which the impact counter member is fixed to a side surface at a predetermined position of the ring gear. (2) The impact counter member is fixed to the side surface of the steel plate ring gear at two positions around 180° of the circumference of the ring gear in the case of a 4-stroke, 4-cylinder engine. Steel plate ring gear shown in Range 1. (3) The impact counter member is fixed to the side surface of the steel plate ring gear at three positions around 120° of the ring gear in the case of a 4-stroke 6-cylinder engine. Steel plate ring gear shown in Range 1.