JPS6179065A - Ring gear with shock countering member - Google Patents

Abstract

PURPOSE:To provide a ring gear of low cost, which is mounted on the flywheel of an automobile engine, by providing a shock countering member made of a high-strength steel and having the same tooth form as the ring gear, and by securing the member on the side of the gear. CONSTITUTION:A ring gear 6 is made of a cheap ordinary steel subjected to rolling, cutoff and welding and thereafter to cutting on each surface and tooth cutting on the peripheral surface. A shock countering member 4, which is made of a high-strength steel and has teeth having an arc angle of 30 deg.-60 deg. and the same form as those of the ring gear 6, is secured to the side of the peripheral portion of the ring gear by pins or welding. This constitution reduces the number of cutting steps so as to manufacture the ring gear of low cost.

Description

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

(Prior art) As a prior art related to the present invention, Japanese Patent Application Laid-Open No. 57-9795
There is a publication titled No. 6 [Ring Gear Mounting Device], which describes a ring gear mounting device that is integrated with the inside of the ring gear used in automatic transmissions by providing a screw on the outside of the outer casing. There is an explanation that the thickness in the diametrical direction is increased to increase the strength of the ring gear.

Generally, as shown in Fig. 3, the ring gear for automobiles is manufactured by roll-forming square steel bars into a ring shape B, joining them by flash butt welding C, and then cutting gears D. .

However, since the conventional ring gear A is subjected to high torque when starting the engine, a square bar-shaped steel is machined into a ring shape.
Gears are cut all over the outer periphery, and the hardness is increased by quenching, and structural carbon steel (348G) is used as a strong material. For this reason, the rough material has the disadvantage that it is expensive and requires many man-hours to cut the gears and cut each surface.

(Problems to be Solved by the Invention) Therefore, the technical object of the present invention is to manufacture a ring gear that requires fewer cutting steps (and at a lower cost) in a ring gear installed in an automobile engine.

[Structure of the invention]

(Means to solve the problem) The technical measures taken to solve the above technical problem are:
As the material used for the ring gear, low-cost general steel is rolled, cut, welded, and then each surface is cut and the outer circumferential surface is geared to form the ring gear. An impact counter member made of super steel and having a size of 30 to 60' and the same tooth profile as the ring gear is fixed to the side surface of the ring gear by pins 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-cycle, 6-cylinder engine, the pinion gear is fixed at three positions around 120 degrees around the ring gear by welding or caulking, and the pinion gear is likely to jump into the toothed surface of the impact counter member. It has chamfers (chamfers) like this.

(Operation) The above technical means operates as follows. That is, the ring gear attached to the engine flywheel is machined to be made from shell structural steel.

Cutting time such as gear cutting is short (it is easy to process, and the material is low cost. Also, when the engine starts, the pinion gear meshes with the starter motor and rotates the engine, and when the engine rotates, the pinion gear Due to its structure, which is free from the ring gear, the largest impact force is applied to the ring gear due to its rotation when the engine starts, and the meshing position of the pinion gear and ring gear at the time of starting is determined by the engine cycle and number of cylinders. A shock resisting member made of super steel and having the same tooth profile is fixed as a reinforcing material for the ring gear at a position where the pinion gear and ring gear mesh at the time of starting.

In this way, when the impact counter member is fixed to the circumferential teeth, even if the starter motor rotates and the pinion gear jumps in when the engine starts, and a high torque is applied to the ring gear, the tooth profile of the ring gear will not be affected. Since the opposing member is fixed in an arc shape with a constant thickness, abnormalities in the tooth profile, breakage cracks, etc. do not occur at all.

Regarding the fixing of the impact countermeasure member to the ring gear, when used in a 4-cycle 4-cylinder engine, the engine start point is at two locations at 180° on the circumference, and when used in a 4-cycle 6-cylinder engine, the starting position of the engine is at two locations on the circumference. At 3 positions at 120° intervals, approximately 30 to 60° in an arc around that position
A shock-resisting member of a certain size is good.

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

1 is a ring gear, which is formed by rolling general mesh steel, cutting and welding it into a ring shape, and has a tooth profile 3 on the outer circumferential surface of this ring gear.
It was formed by cutting.

Reference numeral 4 denotes a shock countering member made of a super steel plate having an arcuate shape and an angle of 30 to 60 degrees, and is formed with a tooth profile 4a that is the same as the tooth profile of the ring-shaped circumferential portion. 5a, 5b, . . . show the impact counter member 4 welded to the ring gear.

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

〔Effect of the invention〕

The present invention has the following unique effects. In other words, as a ring gear for an engine, it is highly impact resistant and extremely low cost, and can correspond to the output of all engines by changing only the impact countermeasure member according to the output of the engine. In addition, it is possible to achieve a significant weight reduction.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of this embodiment, (A) is a sectional view of the ring gear, (B) is a partially omitted sectional view of this embodiment, and (C) is a plan view of the exit port. be. FIG. 2 is a plan view of another embodiment. Figure 3 is an explanatory diagram of the conventional example, (a) and (b) are views of the installation in 77M and ATM, (c) is a perspective view before gear cutting, and (d) is a perspective view after gear cutting. It is a diagram. 1...Ring gear, 3...Tooth profile, 4.7...Impact counter member, 6...Ring gear with impact counter member

Claims (3)

[Claims] (1) In a ring gear installed in an automobile engine, an impact counter member having the same tooth profile as the ring gear is used, and the position where the ring gear and pinion gear mesh when the engine is started is determined by the engine cycle and the number of cylinders.
A ring gear in which the impact counter member is fixed to a side surface of the ring gear. (2) The impact countering member is fixed to the side surface of the ring gear at two positions around 180° of the circumference of the ring gear when used in a 4-stroke, 4-cylinder engine. The ring gear shown in Section 1. (3) The positions at which the impact counter member is fixed to the side surface of the ring gear are fixed at three positions around 120° around the circumference of the ring gear in the case of a 4-stroke, 6-cylinder engine. Ring gear shown in Section 1.