JPS6344944B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method of manufacturing a starter motor equipped with a planetary gear reduction gear.

Conventionally, there has been a starter motor of this type as shown in FIG. That is, in FIG. 1, reference numeral 1 is a DC motor which is a prime mover of a starting motor, and is composed of a field assembly 2, an armature 3, and a rear bracket 4. The field assembly 2 is composed of a cylindrical yoke 5 manufactured by deep drawing press working of a mild steel plate, and a pole 6 made of a permanent magnet member bonded to the inner peripheral surface of this yoke. Reference numeral 7 denotes a ball bearing fitted in a groove on the inner circumferential surface of the rear bracket 4, and supports the rear end of the rotating shaft 8 of the armature 3. 9 is the armature core, 10 is the armature coil, 11
is a commutator, and 12 is a brush. 13 is a spur gear that drives the planetary gear 14, and is formed integrally with the rotating shaft 8. Reference numeral 8a denotes a flange protruding from the rotary shaft 8, to which thrust washers 15 to 18 are attached, through which the thrust load is received by the bottom 5a integrally formed at the front end of the yoke 5. Ru. A sleeve bearing 19 is fitted to the planetary gear 14, and is supported by a support pin 21 fitted to the flange 20. Reference numeral 22 denotes an internal gear (internal gear) with which the planetary gear 14 is internally meshed, and is mounted together with the intermediate bracket 24 on the inner circumferential surface of the bracket 23. 25
is an output rotating shaft to which a flange 20 is integrally fixed, which is arranged coaxially with the rotating shaft 8, and the rotating speed of the rotating shaft 8 is reduced through the planetary gear 14 and is transmitted and driven. A sleeve bearing 26 is fitted into a groove 27 formed on the rear inner peripheral surface of the output rotating shaft 25, and supports the front end of the rotating shaft 8. 28 is a sleeve bearing fitted on the inner peripheral surface of the intermediate bracket 24, and is connected to the output rotating shaft 2.
It supports the outer peripheral surface of the rear end of 5. A thrust washer 29 is provided between the flange 20 and the intermediate bracket 24, and transmits the thrust stress of the flange 20 by slidingly contacting the intermediate bracket 24.
30 is a helical spline formed on the outer peripheral surface of the output rotating shaft 25, and the clutch outer 32 of the overrunning clutch 31 is located at the front (right side in the figure).
They are spline-engaged so that they slide against each other. 33
35 is a roller, 36 is a clutch inner, 37 is a pinion that is attached to the front end of the clutch inner, and 38 is fitted to the inner peripheral surface of this pinion. This sleeve bearing is slidably supported on the output rotating shaft 25. 39 is the overrunning clutch 3 via the washer 40.
1, and is fixed to the clutch outer 32 by caulking. 41 is a stopper that receives the forward protrusion force of the overrunning clutch 31; 42 is a ring that engages so as to transmit the receiving force of the stopper to the output rotating shaft 25; and 43 is a washer that receives the thrust load of the output rotating shaft 25. This pressure is received so that it comes into sliding contact with the front bracket 44. A sleeve bearing 45 is fitted onto the inner circumferential surface of the front end of the front bracket 44, and supports the front end of the output rotating shaft 25. 46 is a shift lever engaged with the shift ring 33 of the overrunning clutch 31;
7 is connected to the shift lever 46 via a plate 48.
It is a grommet that supports the fulcrum part of.

Since the operation of the above configuration is well known, a description thereof will be omitted.

By the way, in such a conventional starting device, the thrust clearance between the rotary shaft 8 and the output rotary shaft 25 is particularly adjusted to operate the washers 15 to 18, 29, 43.
However, there were drawbacks such as the need to attach a holder and the assembly process was complicated.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional motor, and provides a method for manufacturing a starter motor that has a simple structure and simplifies assembly work.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, reference numeral 49 denotes an armature similar to that described as the conventional device in FIG. 1, and a tapered groove 51 is provided at the front end of the rotating shaft 50. Further, 52 is an output rotating shaft having a tapered groove 53 disposed opposite to the groove 51, and the space formed by the groove 51 and the groove 53 of the rotating shaft 50 has, for example, A sphere 54, such as a steel ball, is attached. The rest of the configuration is the same as the conventional device shown in FIG. 1, so the same symbols are used and the explanation thereof will be omitted.

In such a starter motor, the size of the gap formed by the groove 51 of the rotating shaft 50 and the groove 53 of the output rotating shaft 52 is measured in advance, and a spherical body having a diameter corresponding to the size of the gap is measured in advance. 54 and placing this sphere 54 in the cavity. According to such a configuration, the armature 49
The thrust load is transferred to and from the output rotating shaft 52 through the sphere 54, and the thrust load receiving mechanism is greatly simplified and the assembly work can be easily performed.

As explained above, the present invention provides tapered grooves on the opposing surfaces of the armature rotation shaft and the output rotation shaft, and adjusts the size of the sphere according to the thrust gap created by these grooves. Since the thrust washer is selected and installed, the appropriate amount of thrust gap can be easily obtained, and there is no need to install multiple thrust washers, which were conventionally used. Since parts are not attracted, assembly work can be simplified and made more efficient.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view of a main part of a conventional device, and FIG. 2 is a half-sectional view of a main part of a starter motor assembled according to the present invention. In the figure, 50 is a rotating shaft, 51 and 53 are grooves, 5
2 is a rotation axis, and 54 is a sphere. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1 comprising an armature rotation shaft, a planetary gear reduction device connected to the armature rotation shaft, and an output rotation shaft that decelerates and takes out the rotation of the armature rotation shaft via the planetary gear reduction device, Tapered grooves are provided on the end faces of the armature rotation shaft and the output rotation shaft, respectively, and the armature rotation shaft and the output rotation shaft are arranged coaxially so that these grooves face each other. A method for manufacturing a starting motor, characterized in that a sphere having a diameter corresponding to the length of the gap is selected and mounted in the gap formed between the armature rotating shaft and the output rotating shaft.