JPH022467B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a starting device for starting an engine by moving a pinion forward to mesh with a ring gear of the engine when starting the engine.

Conventionally, this type of starting device has generally used a method that converts the suction force of a solenoid that is energized during startup into the pushing force of a pinion via a lever, but there are also other methods such as an inertial sliding method and an armature shift method. However, due to the increased size and impact problems, the solenoid system was not replaced. However, with this solenoid method, a protrusion is inevitably created on the housing in order to place the lever, which poses a major problem when installing the engine, and the weight of the protrusion accounts for 10 to 20% of the total weight. This is an obstacle to miniaturization and weight reduction. Also, the excitation current of the solenoid is large, for example for large diesel engines.
The current is over 100A, which can cause trouble and is also an obstacle in efforts to save energy.

The first object of the present invention is to eliminate such conventional drawbacks, reduce current consumption, and provide a starter device that is compact and lightweight, and has a simplified external shape to improve engine mountability. It is to be.

In the first invention that achieves the first object, a drive shaft rotatably driven by a starter motor is rotatably supported in the housing, and a sliding tube is provided on the outer periphery of the drive shaft to rotate the drive shaft. They are screwed together via a helical spline that is pushed forward in response to movement, and a pinion that can mesh with the ring gear of the engine is fixed at the tip of this sliding tube.
A coil holder fixed to the side wall of the housing supports a brake coil facing the front end of the sliding tube and a holding coil facing the rear end of the sliding tube. A brake plate is spline-coupled to the sliding tube so as to be allowed to move relative to the sliding tube in the axial direction and prevented from moving around the axis, and is placed opposite to the holding coil and rotates. The holding plate whose movement is blocked is prevented from relative movement in the axial direction and is loosely fitted into the sliding tube, and the holding plate is spring-biased in a direction away from the holding coil.

According to the first invention, the brake coil and the holding coil are arranged adjacent to each other, and the drive shaft, the sliding tube, etc. are magnetized by the magnetic field of these coils, and the sliding surfaces thereof are magnetized. Magnetic powder such as iron powder may adhere to the product and prevent smooth operation.

Therefore, a second object of the present invention is to provide a starter device that prevents such magnetization from occurring and provides smooth operation.

In a second invention that achieves this second object, the brake coil and the holding coil are arranged with their winding directions mutually aligned.

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. First, in FIG. 1, a housing 1
The motor accommodating part 2, the reducer accommodating part 3, and the actuating mechanism accommodating part 4 are integrally connected. Output shaft 6 of starting motor 5 housed in motor housing 2
protrudes into the reducer accommodating portion 3, and a pinion 7 is integrally provided at the tip of the output shaft 6. The pinion 7 meshes with the internal gear 8 in the reducer housing 3, and the actuating mechanism housing 4 is disposed on the end wall of the internal gear 8.
A drive shaft 9 passing through is integrally connected. A sliding tube 10 is fitted onto the outer circumference of the drive shaft 9 so as to be able to rotate integrally with the drive shaft 9 and move relative to the drive shaft 9 in the axial direction. A pinion 12 that can mesh with a ring gear 11 of the engine is formed in the engine.

The drive shaft 9 has a large diameter portion 13, a medium diameter portion 14, and a small diameter portion 15 formed in this order from the starting motor 5 side. It is supported by a partition wall 16 between them via a bearing 17. A helical spline 18 is formed on the outer periphery of the medium diameter portion 14, and a short cylindrical stopper 19 is attached to the tip of the small diameter portion 15. A ring 20 fitted to the small diameter portion 15 prevents the stopper 19 from falling off the tip of the small diameter portion 15 .

The sliding cylinder 10 is basically formed in a cylindrical shape, and has a coupling hole 22 formed on the inner periphery in which a helical spline 21 to be screwed into the helical spline 18 is formed, and an outer periphery of the small diameter portion 15 of the drive shaft 9. A small-diameter hole portion 24 that holds a bearing 23 in sliding contact with the surface, and a guide hole portion 25 that allows relative movement of the stopper 19 when the sliding tube 10 moves forward to the right in FIG.
are drilled in order from the starting motor 5 side with the same axis. The stopper 19 comes into contact with the step 26 between the guide hole 25 and the small diameter hole 24 during the forward movement of the sliding cylinder 10, and prevents the sliding cylinder 10 from moving further forward.

A spline 27 parallel to the axial direction is formed on the outer periphery of the sliding tube 10 from a position a distance l1 away from the rear end near the starting motor 5 to a distance l2. Further, a portion near the tip of the sliding tube 10 is supported via a bearing 29 on an end wall 28 of the actuating mechanism accommodating portion 4 on the side opposite to the starting motor 5, and the pinion 12 is supported on the end wall 28 on the opposite side of the starting motor 5.
is projected to the outside. A ring 30 is fitted to the outer periphery of the rear end of the sliding tube 10 near the starting motor 5, and a ring 31 is fitted to the outer periphery of the sliding tube 10 at the end of the spline 27 near the starting motor 5. . A holding plate 32 basically in the shape of a large diameter disc is loosely fitted into the sliding tube 10 between these rings 30 and 31, and a thrust bearing 33 in the shape of a small diameter disc is fitted on the ring 31 side. The retaining plate 32 includes
As shown in FIG. 2, a rectangular notch 34 is formed at the periphery. Further, a rotation prevention plate 35 extending in the axial direction is fixed to the inner surface of the side wall of the actuating mechanism accommodating portion 4 by a screw member 36, and this rotation prevention plate 35 is fitted into the notch 34. Therefore, axial movement of the holding plate 32 is allowed, but rotation around the axis is prevented by the rotation prevention plate 35.

A basically annular coil holder 37 is fixed to the middle of the side wall of the actuating mechanism accommodating portion 4 . The outer peripheral surface of this coil holder 37 is exposed to the outside,
Therefore, the actuation mechanism accommodating portion 4 is substantially formed by integrally connecting a bottomed cylindrical portion closer to the starting motor 5 and a bottomed cylindrical portion closer to the ring gear 11 via the coil holder 37. Further, the rotation prevention plate 35
extends between the partition wall 16 and the coil holder 37. A support collar 38 protruding radially inward is provided at the end of the coil holder 37 near the end wall 28, and between this support collar 38 and the retaining plate 32, a coil-shaped return A spring 39 is interposed.
This return spring 39 biases the holding plate 32 and therefore the sliding tube 10 towards the starting motor 5 side.

The coil holder 37 supports a holding coil 40 facing the retaining plate 32 side, and supports a brake coil 41 facing the end wall 28 side. In addition, the winding directions of both coils 40 and 41 are reversed to each other, thereby making it possible to prevent the central portion of the actuating mechanism accommodating portion 4, that is, the sliding tube 10, the drive shaft 6, etc., from becoming magnetized as much as possible. Therefore, the sliding tube 1
It is possible to prevent the occurrence of a situation in which magnetic powder adheres to the drive shaft 9 and the drive shaft 9 and impedes smooth operation.

Opposed to the brake coil 41, in the space between the coil holder 37 and the end wall 28 is a disc-shaped brake plate 43 having a hole 42 in the center through which the sliding tube 10 is inserted. and is arranged so as to be freely movable in the axial direction. Hole 4 of brake plate 43
A cylindrical part 44 that surrounds the sliding cylinder 10 and enters into the coil holder 37 is connected to the peripheral edge of the sliding cylinder 10.
Spline 4 connected to spline 27 on the outer periphery of
An inward flange 46 having a number 5 formed thereon is provided. Therefore, the brake plate 43 can rotate integrally with the sliding tube 10 and can move relative to the sliding tube 10 in the axial direction.

FIG. 3 is a control circuit diagram of the starting motor 5, the holding coil 40, and the brake coil 41.
The power source 47 is connected to the control means 4 via a start switch 48.
9's first input terminal _I1 . Starting motor 5
is connected to the power supply 47 via a series circuit consisting of a first relay switch _S1 and a resistor 50, and a second relay switch _S2 is connected in parallel with the series circuit. The first relay switch S ₁ is the first relay coil
It composes a relay with C ₁ , and the first relay coil
C ₁ is connected to the first output terminal O ₁ of the control means 49 . Further, the second relay switch S ₂ constitutes a relay together with the second relay coil C ₂ , and the second relay coil C ₂ is connected to the second output terminal O ₂ of the control means 49 . The holding coil 40 and the braking coil 41 are connected to the third output terminal O ₃ of the control means 49 . Furthermore, the control means 49 is provided with second and third input terminals I ₂ , I ₃ , a backward position detector 51 is connected to the second input terminal I ₂ , and a third
A forward position detector 52 is connected to the input terminal _I3 . Although not shown in FIG. 1, the retreat position detector 51 detects a state in which the sliding tube 10 retreats to the left in FIG. 1 and the pinion 12 and ring gear 11 are disengaged. When the condition is detected, an electrical signal is applied to the second input terminal _I2 . Although not shown in FIG. 1, the forward position detector 52 detects the state in which the sliding tube 10 moves forward to the right in FIG. 1 and the pinion 12 meshes with the ring gear 11. When detected, an electrical signal is applied to the third input terminal _I3 .

The control means 49 controls the holding coil 40 and the brake coil when the starting switch 48 becomes conductive and a signal is applied to the first input terminal I ₁ while an electric signal is input to the second input terminal I ₂ . 41, and the first relay coil _C1 .
As a result, the first relay switch _S1 becomes conductive, and the starting motor 5 is driven by the electric power limited by the resistor 50. Further, when an electric signal is input to the third input terminal _I3 , the control means 49 controls the first relay coil _C1.
demagnetizes and energizes the second relay coil _C2 . As a result, the first relay switch _S1 is cut off, the second relay switch _S2 is made conductive, and the starting motor 5 is driven by the rated power.

Next, the operation of this embodiment will be explained. First, when the sliding tube 10 is retracted as shown in FIG. At the same time, the holding coil 40 and the brake coil 41 are excited. The drive shaft 9 is rotated by the driving of the starting motor 5, and attempts to rotate the sliding tube 10 connected via the helical splines 18 and 21 together. However, the brake plate 43 is attracted to the coil holder 37 by the excitation of the brake coil 41, and the spline 45 integrally provided on the brake plate 43 is coupled to the spline 27 of the sliding tube 10. Therefore, the sliding tube 10 is prevented from rotating integrally with the drive shaft 9 and advances toward the right in FIG. In response to this forward movement of the sliding tube 10, the holding plate 32 is pressed by the ring 30 and moves forward while compressing the return spring 39.

As the sliding tube 10 moves forward, the pinion 12 comes into contact with the side surface of the ring gear 11 due to phase mismatch;
When further advance is prevented, the rotation of the drive shaft 9 causes the brake plate 43 to move toward the brake coil 41.
The sliding tube 10 rotates slightly against the suction force of the pinion 12 and the ring gear 1.
1, the sliding tube 10 moves further forward and the pinion 12 and ring gear 11 mesh as shown in FIG.

In this engaged state, the brake plate 43 is pressed by the ring 31 and separated from the coil holder 37, and the retaining plate 32 is now attracted to the coil holder 37 by the attraction force of the holding coil 40.
Moreover, when the sliding tube 10 is in the forward movement state, the second relay switch _S2 (see FIG. 3) is turned on and the starting motor 5 is driven at the rated power. Therefore, the sliding tube 10 rotationally drives the ring gear 11 with the rated driving force via the pinion 12 to start the engine, and the reaction force is absorbed by the coil holder 37 and is transferred to the thrust bearing by the retaining plate 32. It can be received via 33. At this time, the holding plate 32 is stopped from rotating by the rotation preventing plate 35, so it remains stationary, and the return spring 39 is not twisted.

After the engine starts, the driving of the starting motor 5 is stopped and the holding coil 4
0 and the brake coil 41 are deenergized, and in response, the holding plate 32 is returned to the starting motor 5 side by the spring force of the return spring 39. Therefore, the holding plate 32 in contact with the ring 30 causes the sliding tube 10 to move back and return to its original position, moving the pinion 12 to the ring gear 1.
Separate from 1.

As described above, according to the first invention, the sliding tube is screwed onto the drive shaft via the helical spline, and the coil holder fixed to the side wall of the housing has the following features:
A brake coil facing the front end of the sliding tube and a holding coil facing the rear end of the tube are supported, and a brake plate facing the brake coil allows relative movement in the axial direction with the sliding tube. The retaining plate facing the retaining coil is spline-coupled to the sliding tube while being prevented from relative movement around the axis, and is loosely fitted into the sliding tube while being prevented from relative movement in the axial direction. The sliding tube moves forward toward the tip side by suction to the holding coil, and the meshing state between the pinion at the tip of the sliding tube and the ring gear is maintained by suction to the holding coil of the holding plate. . Therefore, by selecting a small diameter of the coil holder, the housing can be made small and simple in shape, and the engine mountability is improved. Furthermore, the excitation current of the brake coil and the holding coil can be small, so current consumption is reduced. Further, since the retaining plate is prevented from rotating, the spring biasing the retaining plate will not be twisted.

According to the second invention, in addition to the configuration of the first invention, the winding directions of the brake coil and the holding coil are reversed, so that in addition to the effects of the first invention, the drive shaft and sliding It is possible to prevent the magnetization of the cylinders and the like to avoid adhesion of magnetic powder to the sliding surfaces thereof, thereby achieving the effect of enabling smooth operation.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is an overall vertical sectional view, Fig. 2 is a sectional view taken along the line - - in Fig. 1, and Fig. 3 is a starting motor, a holding coil, and a brake coil. FIG. 4 is a broken sectional view showing the state in which the pinion is engaged with the ring gear. 1...Housing, 5...Starting motor, 9...
Drive shaft, 10...Sliding tube, 11...Ring gear,
12... Pinion, 18, 21... Helical spline, 27, 45... Spline, 30, 31
... Ring, 32 ... Holding plate, 33 ... Thrust bearing, 34 ... Notch, 35 ... Rotation prevention plate, 3
7... Coil holder, 39... Return spring, 40...
... Holding coil, 41 ... Brake coil, 4
3...Brake plate.

Claims (1)

[Scope of Claims] 1. A drive shaft rotatably driven by a starter motor is rotatably disposed in the housing, and a sliding tube is disposed on the outer periphery of the drive shaft so as to move toward the tip side according to the rotational movement of the drive shaft. A pinion that can be engaged with the ring gear of the engine is fixed at the tip of the sliding tube, and a coil holder is fixed to the side wall of the housing. supports a brake coil facing the front end of the sliding tube and a holding coil facing the rear end of the sliding tube, and a brake plate disposed opposite to the brake coil supports the sliding tube. A holding plate that is spline-coupled to the sliding cylinder, is allowed to move relative to the cylinder, is prevented from moving relative to the axis, is disposed opposite to the holding coil, and is prevented from rotational movement, and is prevented from moving relative to the axis. 2. A starter device, characterized in that the holding plate is loosely fitted into the sliding tube while being prevented from moving, and the holding plate is biased by a spring in a direction away from the holding coil. 2. A drive shaft rotatably driven by a starter motor is rotatably supported in the housing, and a helical cylinder is provided on the outer periphery of the drive shaft so that a sliding tube is pushed out toward the tip side in accordance with the rotational movement of the drive shaft. The sliding tube is screwed together via a spline, and a pinion that can mesh with the ring gear of the engine is fixed at the tip of the sliding tube. A brake plate is supported by a brake coil facing the front end of the sliding tube, and a holding coil facing the rear end of the sliding tube and wound in the opposite direction to the brake coil, and is disposed opposite to the brake coil. a holding plate which is spline-coupled to the sliding cylinder, is allowed to move relative to the sliding cylinder in the axial direction, is prevented from moving relative to the axis, is disposed opposite to the holding coil, and is prevented from rotating; is loosely fitted into the sliding tube while being prevented from relative axial movement, and the holding plate is biased by a spring in a direction away from the holding coil.