JPH0347467A - Coaxial type starter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coaxial starter, particularly to a connection structure between a fixed contact of an electromagnetic switch and a terminal bolt.

[Conventional technology]

Conventionally, a coaxial starter has been constructed as shown in FIG. Usually, in a coaxial type starter, the armature rotation shaft 2 of the DC motor a1 is made hollow, and the push rod 4 supported by the plunger rod 3a of the electromagnetic switch device 3 arranged at the rear end of the DC motor l is connected to the armature rotation shaft. The output rotating shaft 5 is inserted into the internal passage 2a of the armature rotating shaft 2 and is placed coaxially with the front end of the armature rotating shaft 2. It is configured such that the output rotation shaft 5 can be pushed forward by the rotation.

In this coaxial starter, a commutator 6 is attached to the rear of the armature rotating shaft 2a, and a brush 9 supported by a retainer 8 fixed to a mounting plate 7 is in sliding contact around the commutator 6. Two terminal bolts 10 (only one terminal bolt is shown in FIG. 7) are installed between the rectifier device including the commutator 6, brush 9, retainer 8, etc. and the electromagnetic switch device 3. A terminal device 11 molded with resin is attached to a notch formed on the circumferential surface of the rear bracket 1b, and one side of the terminal device 11 has a terminal device 11 that can be short-circuited by a movable contact 12 of an electromagnetic switch device 3. Two fixed contacts 1314 are provided to protrude. Each fixed contact 13, 14 has a terminal bolt 10.
It is formed integrally with and is integrally molded, and 1
5 indicates this mold part.

One of these two terminal bolts 10 is connected to a battery as a power source mounted on the vehicle by a power supply line, and the other is connected to the positive side brush 9 and the excitation coil 16 of the electromagnetic switch device 3. connected to the section.

In FIG. 7, 17 is the core of the electromagnetic switch device 3, 18 is a plunger which is slidably disposed on the inner circumferential side of the exciting coil 16 and integrally fixed to the plunger rod 3a, and 19 is an output rotation shaft. 5, a pinion is attached to the front end of the output rotating shaft 5 and engages and disengages from the engine link gear (not shown) by reciprocating the output rotating shaft 5; 20 is a planetary gear reduction device that reduces the rotation of the armature rotating shaft 2; 21 is a planetary gear reduction device; Each shows an overrunning clutch device that transmits the rotation decelerated by the planetary gear reduction bag R20 to the output rotation shaft 5 and prevents reverse transmission to the DC motor 1 when the output rotation shaft 5 is rotated at high speed by the engine. ing.

(Problem n to be solved by the invention) However, in the above-mentioned conventional coaxial starter, the terminal bolt 10 and the fixed contacts 13 and 14 are formed integrally, so the shape is very complicated and it is difficult to form them. There was a problem that required difficult work. Also, the terminal bolt 10
A power supply line connected to the battery is fixed to the terminal, and the power supply line is relatively thick because it carries a large current, and is tightly tightened to the terminal bolt 10. For this reason, a strong force is applied to the terminal bolt 10, and therefore the terminal bolt 10 needs to have a high fixing strength, but in a conventional coaxial starter, the terminal bolt 10 is only held by the molded part 15. Therefore, there was a problem that the fixing strength of the terminal bolt 10 was low.

This invention was made to solve the above-mentioned conventional problems, and an object of the present invention is to obtain a coaxial starter whose terminal bolts are easy to form and whose fixing strength is high.

[Means to solve the problem]

The coaxial starter according to the present invention electrically connects the fixed contact and the terminal bolt using a contact Vt@ whose engagement portion with the terminal bolt is a thin plate having a substantially U-shape, and The terminal bolt is fastened by making the head of the terminal bolt polygonal and having at least one side thereof abut against the fixed contact conductor part or the molded part.

[For production]

In this invention, since the terminal bolt is formed separately from the fixed contact and connected using a connecting plate, there is no need for a terminal bolt with a special and complicated shape, and the molded part of the fixed contact is also connected to the terminal bolt. Since it is a separate piece, the terminal bolt is directly fixed to the machine frame through the molded part.

(Example) Fig. 1 is a front view showing a cutaway main part of a coaxial starter according to an embodiment of the present invention. , corresponding parts are given the same reference numerals and their explanations are omitted. 30 is a core and contact assembly, which are configured as shown in FIGS. 2 to 5. That is, the core and contact assembly The body 30 includes a disk-shaped core 31, an opening 32 is formed in the center of the core 31, and a slightly protruding band-shaped circumference is formed on the front surface side along the peripheral edge of the opening 32. A suction force generating section 33 in the direction area is formed.
On the ground surface side of the core 31, a cylindrical portion 34 is integrally formed that extends from the periphery of the opening 32 along the central axis direction. I support it.

Furthermore, as shown in FIG. 3, this core 31 is provided with a recess 35 for arranging a fixed contact on the suction force generating portion 33, and this recess 35 has a radial transverse virtual line passing through the center of the core 31. The other portions are formed symmetrically with respect to the line 36.

Moreover, a window 37 communicating from one surface side to the ground surface side is formed in the portion of the core 31 where each recess 35 is located.

A fixed contact 38.39 is arranged in each recess 35, and conductor parts 38a, 3 integral with these fixed contacts 38.39.
9a extends to the ground surface side of the core 31 through the case 37, as shown in FIG.
The end becomes a terminal 38b for connecting to the plus side brush of the DC motor 1, and a connecting plate 40 is connected to the conductor portion 39a of the other fixed contact 39 by welding.

As shown in FIG. 6, this connection plate 40 is made by bending a thin plate member into an L-shape in cross section, and includes a flat plate part 40a connected to a fixed contact conductor part 39a, and a substantially cylindrical part connected to the head of a terminal bolt, which will be described later. It is formed from a letter-shaped (fork-shaped) engaging portion 40b.

In addition, the fixed contacts 38, 39 and the conductor portions 38a, 3
9b to the core 31 and to maintain insulation from the core 31, the fixed contacts 38, 39, except for the contact surfaces with the movable contacts, and the conductor portion 38a.

The window 37 passing portion of 39b is molded with resin, and 41 indicates this resin molded portion. The molded portion 41 is provided so as to partially protrude from both sides of the core 31 in order to enhance the fixing effect to the core 31, and is also provided to partially protrude from both sides of the core 31.
Covers 42 and 43 having a substantially U-shaped cross section are integrally extended along the axial direction from the recess 35 in which 8.39 is disposed, and are fixed to each ' with the open part facing the center side. It surrounds contacts 38 and 39.

The core and contact assembly 30 configured in this way is connected to the DC motor l1 of the case 45 in the electromagnetic switch W44.
The outer peripheral part of the core 31 is fitted onto the case 45. Plunger 46. Movable contact 12. Electromagnetic switch device 44 along with plunger rod 3a, excitation coil 16, etc.
It consists of

Among these, the plunger 46 has a notch in the peripheral wall corresponding to the position of the cover 42.43 so that the plunger 46 does not come into contact with the cover 42.43 and be prevented from moving during suction to the core 31, as shown in FIG. 47 is formed.

The terminal bolt 48 is fixed to a rear bracket 50, which is a machine frame, via a bushing 49 made of hard resin for insulation. Further, the head 48a is formed into a square shape,
- The terminal bolt 48 is prevented from rotating by bringing the side into contact with the conductor portion 39a of the fixed contact 39. Further, an engaging portion 40b of the connecting plate 40 is provided between the head 48a and the bush 49.
The terminal bolt 48 is disposed so as to sandwich the shaft portion of the terminal bolt 48, and by tightening the terminal bolt 48, an electrical connection from the terminal bolt 4 to the fixed contact 39 is reliably established.

An O-ring 51 is disposed between the shaft of the terminal bolt 48 and the rear bracket 50, and a washer made of hard resin for insulation is disposed between the nut 52 that fastens the terminal bolt 48 and the rear bracket 50. 53 are arranged.

Note that the terminal 38b of the fixed contact 38 is connected to the positive side brush by a screw 54.

Further, the rear bracket 50 and the case 45 of the electromagnetic switch device 44 are fitted with a spigot, and a part of the spigot has an O.
A ring 55 is fitted.

The coaxial starter configured in this way has a fixed contact 39.
(and the conductor portion 39a) and the terminal bolt 48 are separate bodies, so it is different from the conventional one? j! No need for complicated and special shaped terminal bolts 1. Easy to process. Further, since the terminal bolt 48 is directly fixed to the rear bracket 50 separately from the core and the molded part 41 of the contact assembly 30, the fixing strength is improved. In this case, a bush 49 and a washer 53 are interposed between the terminal bolt 48 and the rear bracket 50, but these are provided for insulation and are relatively thin. The terminal bolt 48 is fixed by tightening the nut 52 so that the rear bracket 50 is held between the head 48a and the nut 52, so the terminal bolt 48 is held in place by the molded part only. Fixing strength is greatly improved.

Furthermore, since the fixed contact 39 and the terminal bolt 48 are connected via the connection plate 40, and the connection plate 40 is formed of a thin plate, the position of the terminal bolt 48 and the core and contact assembly 30 can be adjusted at the time of assembly. Even if there is a slight dimensional error between the connecting plate 40 and the fixed contact 39, the connecting plate 40 can absorb the dimensional error by deforming. A reliable electrical connection between the contact 39 and the terminal bolt 48 can be achieved.

Furthermore, in the above embodiment, the opening of the rear bracket 50 into which the terminal bolt 48 is inserted is surrounded by the bushing 49 and the washer 52, and the O-ring 51 is provided, so that water from the opening of the rear bracket 50 is prevented. Intrusion can be prevented. That is, conventionally, as in the coaxial starter shown in FIG. 7, the molded part 15 and the rear bracket 1b are simply in contact with each other, and dimensional errors between the molded part 15 and the rear bracket 1b are likely to occur.
For this reason, a gap is created in the abutment area between the mold part 15 and the rear bracket 1-1b, and water infiltrates.In contrast, in the above embodiment, the above-described structure prevents water from intruding into the interior. It is. Further, in the embodiment, the case 45 of the electromagnetic switch device 44 and the rear bracket 50 are fitted with a spigot, and the O-ring 55 is also provided at this spigot fitting part, so that the case 45 and the rear bracket 50 are not connected to each other. It is possible to prevent water from entering the electromagnetic switch device 44 from inside the electromagnetic switch device 44.

In addition, in the above embodiment, the fixed contact conductor portion 39a and the connection plate 4
0 is connected by welding, but it may be connected by caulking or the like.Also, by making the head 48a of the terminal bolt 48 square and having one side of the head 48a contact the conductor part 39a, the rotation of the terminal bolt 48 can be prevented. However, the shape of the head 48a does not have to be particularly quadrangular, but may be a polygon such as a hexagon.
The conductor part 39a is covered with the mold part 41 instead of directly,
It may be made to come into contact with this mold part 41, and furthermore, two or more sides of the head 48a may be brought into contact.

〔Effect of the invention〕

As described above, according to the coaxial starter of the present invention, the fixed contact and the terminal bolt are formed separately and connected using a connecting plate, so that the terminal bolt can be easily formed. Further, since the terminal bolt can be directly fixed to the machine frame, there is an effect that the fixing strength of the terminal bolt can be improved.

[Brief explanation of drawings]

FIG. 1 is a front view showing a cutaway main part of a coaxial starter according to an embodiment of the present invention, FIG. 2 is a perspective view showing a core, a contact assembly, and a plunger of the same coaxial starter;
FIG. 3 is a front view of the core and contact assembly, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, FIG. 5 is a sectional view taken along the line V-V in FIG. 3, and FIG. FIG. 7 is a perspective view of a connecting plate of a contact assembly, and a sectional view showing a conventional coaxial starter. 1... DC motor, 2... Armature rotating shaft, 5...
Output rotating shaft, 19... Pinion, 38.39... Fixed contact, 39a... Conductor portion, 40... Connection plate, 40
b...Engaging part, 41...Mold part, 44...Electromagnetic switch device, 48...Terminal bolt, 48a...
head. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] An armature rotating shaft of the electric motor, an output rotating shaft having a pinion at the front end and capable of sliding in the axial direction, and an electromagnetic switch device attached to the rear end side of the electric motor are arranged on the same axis,
In a coaxial starter in which a terminal bolt connected to an external power source is attached to the machine frame, the fixed contact of the electromagnetic switch and the terminal bolt are electrically connected to the fixed contact conductor part, and the terminal bolt is connected to the fixed contact of the electromagnetic switch. The engaging portions are connected by a connection plate made of a substantially U-shaped thin plate, and the head of the terminal bolt is polygonal, and at least one side thereof is attached to the fixed contact conductor portion or a mold portion for fixing the fixed contact conductor portion. A coaxial type starter, characterized in that the terminal bolts are brought into contact with each other to prevent rotation of the terminal bolts.