JPH03217655A - Starter - Google Patents

Abstract

PURPOSE:To eliminate a need for a link mechanism, save spaces required to a great extent while making a device small in size as well as to get rid of mechanical impact, and thereby decrease stresses by constituting a pinion gear to be shifted with the pressure of gas and liquid such as air, oil, grease and the like actuated. CONSTITUTION:A coil 8 for shifting a pinion gear 4, which is rolled coaxially with the pinion gear 4, is provided. The pinion gear 4 is shifted with the pressure of gas and liquid increased and/or decreased by means of a movable iron piece 11 which is shifted with the coil 8 excited. When the pinion gear is shifted by the use of gas and liquid such as air, oil, grease and the like which are effective in absorbing mechanical shock, this effectively renders services to the case of a total coaxial method wherein a magnet switch is disposed on an inner shaft in a space between a motor and the pinion gear.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a -1 starter for starting an engine, and more particularly to a starter that shifts a pinion gear.

[Conventional technology]

As shown in FIG. 4, in the conventional device, the pinion gear 4 is shifted to the right by the link mechanism of the shift lever 3 by the suction force of the separately installed mag switch 2, and the ring gear 5 is shifted to the right.
The engine engaged and rotated, starting the engine.

[Problem to be solved by the invention]

Since the above conventional technology uses a mechanical link mechanism, the contact portion between the movable iron piece 6 or the clutch outer 7 and the shift lever 3,
A large impact force is applied to the end surface contact portion between the pinion gear 4 and the ring gear 5, resulting in problems such as mechanical strength and large noise. In addition, a link mechanism storage space was required, resulting in an increase in size.

The object of the present invention is to eliminate the link mechanism and provide a compact and novel device.

[Means to solve the problem]

In order to achieve the above purpose, air with low mechanical impact force,
This method uses gas or liquid such as oil or grease to shift the pinion gear, and is particularly effective in the case of a total coaxial system in which the mag switch 2 is installed on the inner shaft within the section between the motor 1 and the pinion gear 4. be.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. The excitation coil 8 is wound coaxially with the pinion shaft 9 and is formed in a solenoid shape. A fixed iron core 10 is formed in a donut shape so as to surround the excitation coil 8, and forms a magnetic path of the solenoid. A defect is formed in a part of the outer circumference of the fixed iron core 10, and a movable iron piece 11 that can slide in the axial direction is provided in the defect, and the fixed iron core 10 and the movable iron piece 11 are attracted by excitation of the excitation coil 8. We're starting to get along. A cylindrical partition plate 12 is provided on the inner periphery of the movable iron piece 11.
A clutch outer 13 that is slidable in the axial direction is provided on the inner circumference thereof. Each sliding portion is provided with packings 15, 16, and 17 for keeping the pressurizing chamber 14 airtight.

By sliding the movable iron piece 1l to the left, the pressurizing chamber 14 is compressed to a high pressure, and this pressure shifts the clutch outer 13 and the pinion gear to the right. Spline groove 1 on the surface of pinion shaft 9 and the inner circumference of clutch outer 13
2, the rotation of the motor 1 is transmitted to the clutch outer 13 to rotate the pinion gear 4.

The spline groove 18 also allows the clutch outer 13 to be shifted in the axial direction. The movable contact 19 is slidably located on the outer periphery of the movable iron piece 11, and comes into contact with the fixed contact 20 when the movable iron piece 11 moves leftward. Due to this contact, the motor 1 starts rotating, rotates the ring gear 5, and starts the engine. Push spring 21
The rear part of the movable contact 19 is constantly pressed to maintain the holding force between the contacts.

When the excitation coil 8 is de-energized, the return spring 22
This is for returning the movable iron piece 11 to the state shown in FIG.

When the movable iron piece 11 begins to return to the state shown in FIG.
The pressure becomes smaller, and the clutch outer 13 returns to the state shown in FIG.

This will be explained in detail with reference to FIGS. 2(a) and 2(b). FIG. 2(a) is an enlarged view of the main part of FIG. 1, and FIG. 2(b) is a diagram showing the pinion gear 4 shifted to the right by the attraction force of the coil 8. In order to maintain the high pressure generated in the pressurizing chamber 14, packings 15, 16, and 17 are fitted into each contact portion.

The pipe 23 forcibly increases pressure from the outside to the pressurizing chamber 14,
This is an effective means when speed of operation is required. By making the pressure higher than the surroundings, it is possible to reduce the idle operation time or to assist the shifting operation of the movable iron piece 11.

The spring 24 is for quickly returning the clutch outer 13 to the state shown in FIG. 1(a).

The hole 25 is an air circulation hole for maintaining the same pressure in the chambers on both sides by the left and right movement of the movable iron piece l1. Another embodiment is shown in FIG. When the movable iron piece 26 is on the right side, the high pressure force in the pressurizing chamber 27 acts to push the clutch outer 29 to the right through the passage 28.

〔Effect of the invention〕

According to the present invention, the link mechanism can be omitted, resulting in significant space savings and miniaturization.

Furthermore, since the shift operation is performed by the pressure of gas or liquid, there is no mechanical impact and stress can be alleviated. Additionally, eliminating the shift lever has the effect of reducing noise.

[Brief explanation of drawings]

Figure 1 is a sectional view of a starter according to an embodiment of the present invention, and Figure 2 (
a) is the main sectional view of Figure 1, and Figure 2 (b) is Figure 2 (a).
3 is a main sectional view showing another embodiment, and FIG. 4 is a sectional view of a starter showing a conventional structure. 3...Shift lever, 4...Pinion gear, 5...
Ring gear, 8... Exciting coil, 10... Fixed core, 11... Rod L No. 2 mouth (cL) No. 3 mouth 26 Tei 4 Figure 2

Claims (1)

[Claims] 1. A starter characterized in that a pinion gear is shifted by manipulating the pressure of gas or liquid such as air, oil, or grease. 2. In claim 1, a shifting coil for the pinion gear is provided, which is wound coaxially with the pinion gear, and the pinion gear is shifted by increasing or decreasing gas or liquid pressure by a movable iron piece that is shifted by excitation of the coil. A starter characterized by: 3. In claim 1, the pressure in the pressurizing chamber is always made higher than the surrounding environment, the pinion gear is shifted only by pressurization or depressurization from the outside, and the pressure increase/decrease is helped by the operation of the movable iron piece. Therefore, the starter is characterized in that the pinion gear is shifted by forcibly pressurizing, depressurizing, and sealing the pressurizing chamber from the outside.