JPH0720377Y2 - Starter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a starter used for starting an internal combustion engine.

[Problems to be Solved by Prior Art and Invention] Generally, in this type of starter, a pinion gear is spline-fitted to an output rotary shaft of a starter motor so as to be movable in an axial direction, and the pinion gear is connected to a shift lever. There is a structure in which the engagement / disengagement with respect to the ring gear on the internal combustion engine side is performed by the swinging of the.

In such a case, it has been mainly attempted in the past to swing the shift lever by using a solenoid mechanism, but it is not permissible that the size becomes large in order to obtain the initial suction force. There is a problem that the final suction force is large and the impact during gear engagement is large.

Therefore, as disclosed in Japanese Utility Model Application Laid-Open No. 60-30364, the shift lever swing can be replaced by a solenoid mechanism to obtain high torque even with a small one, and avoiding shocking gear meshing. There is one that employs a possible shift motor.

However, in this device, a pair of terminal plates for closing the power supply circuit of the starter motor are arranged so as to sandwich the shift motor from both inside and outside in the radial direction of the starter motor. For this reason, it is necessary to secure a mounting space for the terminal plate between the shafts of both motors and on the outside of the shifting motor, which increases the distance between the shafts of both motors and further increases the outer diameter side. The provision of the terminal plate inevitably causes a problem that the starter becomes large in the radial direction, which limits the size reduction and weight reduction of the starter.

[Means for Solving Problems] The present invention was devised for the purpose of providing a starter capable of eliminating these drawbacks in view of the above-mentioned circumstances, and is assembled to a case body. The pinion gear, which is spline-fitted to the output rotary shaft from the starter motor so as to be movable in the axial direction, is engaged / disengaged with the ring gear on the internal combustion engine side by swinging the shift lever. In the starter, a shift motor arranged in parallel to the output rotation shaft of the starter motor and a base end portion of a shift lever are connected via a pin, and a base end portion is connected to an output shaft from the shift motor. Form a power supply circuit to the starter motor and a contact shift that engages with the helical spline and moves in the axial direction by driving the shift motor to swing the shift lever. A pair of terminal plates that are integrally supported on the case body side,
It is fitted to the outer periphery of the contact shift so as to face the terminal plate so as to be movable in the axial direction, and is elastically contacted with the terminal plate by the movement of the contact shift based on the driving of the shift motor to close the power supply circuit of the starter motor. The contact shift has a flat non-circular shape in which the contact plate of the contact shift fits into the outer circumference of the starter motor. As
While preventing rotation around the shaft center of the contact plate fitted to the outer periphery, the outer peripheral shape of the contact plate is also a flat non-circular shape that bulges in the direction around the shaft center of the starter motor, and further, a pair. The terminal plate is characterized in that it is arranged at a position sandwiching the output shaft of the shift motor from both sides in the direction around the shaft center of the starter motor so as to correspond to the bulging portion of the contact plate.

Further, according to the present invention, the shift motor can be made smaller and lighter, and the starter itself can be made smaller and lighter.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, 1 is a case body of the starter motor,
The tip of the output rotary shaft 2 is rotatably supported by the case body 1. The clutch outer 3b of the one-way rotary clutch 3 is splined in the middle of the output rotary shaft 2 so as to be movable in the axial direction. It is fitted. A pinion gear 6 is integrally provided on the clutch inner 3c of the one-way rotating clutch 3. The pinion gear 6 can be freely displaced together with the one-way rotating clutch 3 into a position where it meshes with the ring gear 8 on the internal combustion engine side and a position where it is released.

On the other hand, 4 is a starter motor, and the motor shaft 4a of the starter motor 4 is coaxially coupled to the base end portion of the output rotary shaft 2 via the planetary gear mechanism 5 but in a decelerating manner. Then, as will be described later, when the starter motor 4 is driven in a state where the pinion gear 6 is located at the meshing position, the pinion gear 6 rotates via the motor shaft 4a, the planetary gear mechanism 5, the output rotation shaft 2, and the one-way rotation clutch 3. As a result, the ring gear 8 is forcibly rotated to start the internal combustion engine. Incidentally, when the internal combustion engine is started, the one-way rotation clutch 3 prevents the rotational force on the internal combustion engine side from being transmitted to the starter motor 4 side.

Reference numeral 7 denotes a shift motor provided in the case body 1. The shift motor 7 has a built-in speed reduction mechanism (not shown) so that the rotation of the output shaft 7a is greatly reduced with respect to the motor rotation speed. The output shaft 7a is engraved with multiple helical spline grooves 7b. This helical spline groove 7b
The base end side of the contact shift 9 is helically spline-fitted to the front side of the contact shift 9, and the support body 10 integrally protruding from the case body 1 is slidably fitted to the front end side of the contact shift 9. The contact shift 9 guides the movement of the contact shift 9 in the axial direction.

Further, a contact plate 11, which will be described later, located on the shift motor 7 side is attached to the contact shift 9 so as to be slidable in the axial direction, and a tip end portion corresponding to a fitting portion of the contact shift 9 with the support body 10. The mounting cylinder 12 is integrally provided in the. This mounting cylinder 12 has a shift lever 13
The base end portion of is pivotally supported by a pin 13a, and this pin 13a penetrates a groove portion 10a formed in the support body 10, whereby the shaft of the contact shift 9 is It is configured to regulate the rotation around the core.

On the other hand, the intermediate portion 13b of the shift lever 13 is in contact with the support piece 5b protruding from the ring gear 5a of the planetary gear mechanism 5 on one side and with the end portion 1b of the case body 1 on the other side. Therefore, both sides are rotatably supported and swing about the fulcrum. The other end of the shift lever 13 is further provided with a unidirectional rotation clutch 3 part. It is engaged with the groove 3a. Then, as will be described later, when the shift motor 7 is driven and the contact shift 9 is forcibly moved to the shift motor 7 side by the helical spline, the shift lever 13 moves the intermediate portion 13
The pinion gear 6 is moved together with the one-way rotating clutch 3 by swinging around b as a fulcrum to the side meshing with the ring gear 8.

Reference numeral 14 denotes a pair of terminal plates integrally attached to the case body 1. The terminal plates 14 are arranged so as to sandwich the output shaft 7a of the shift motor 7 from both sides. The installation positions are further arranged on the left and right sides so as to intersect with the axial center direction of the starter motor 4, that is, the axial direction of both motors 4 and 7 substantially orthogonally. On the other hand, the contact plate 11 is
Both sides whose outer peripheral shape corresponds to the terminal plate 14
11a has a flat non-circular shape that bulges in the direction around the axis of the starter motor 4. Further, the outer peripheral shape of the contact shift 9 is also a flat non-circular shape that bulges in the direction around the shaft center of the starter motor 4, and the contact plate 11 is fitted onto the outer peripheral surface of the contact shift plate 9 to thereby make contact plate contact. Rotation around the axis of 11 is restricted, and it is slidable only in the axis direction. Then, as described above, when the contact shift 9 moves to the shift motor 7 side, the contact plate 11 becomes a pair of terminal plates.
The power supply circuit of the starter motor 4 is closed by elastically contacting the starter motor 4, so that the starter motor 4 is driven to start the internal combustion engine. Reference numeral 15 is an ammunition for urging the contact plate 11.

In the embodiment of the present invention configured as described above, when the internal combustion engine is started, as described above, the starter switch is turned on to drive the shift motor 7, the contact shift 9 moves, and the shift lever 13 moves. Is oscillated, the pinion gear 6 is displaced so as to mesh with the ring gear 8, and the starter motor 4 is driven to follow the displacement.

As described above, according to the present invention, the pinion gear 6 is moved so as to be meshed with the ring gear 8 by the forward / backward swing of the shift lever 13 accompanying the displacement of the contact shift 9. In this case, however, The displacement of 9 is achieved by using the shift motor 7 so that smooth and impact-free gear meshing is achieved.

Moreover, this is not the one in which the pair of terminal plates 14 are sandwiched by the output shaft of the shift motor 7 from both sides in the radial direction of the starter motor 4 as in the conventional case. Since it is arranged so as to be sandwiched from both sides and the terminal plate 14 is not provided between the motors 4 and 7 and on the outer diameter of the shift motor 7, the axial distance between the motors 4 and 7 is of course thing,
It is not necessary to secure a mounting space for the terminal plate 14 even in the outer diameter direction.

In addition, since the contact shift 9 and the contact plate 11 have a flat non-circular shape that bulges toward the starter motor 4 toward both sides in the direction around the shaft center, the flatness of the contact shift 9 and the contact plate 11 further increases the radial size. This and the fact that it is not necessary to secure the installation space for the terminal plate 14 in the radial direction combine with the fact that the starter itself can be made small in the radial direction and its projected area can be increased. It will be possible to make a compact type that is as small as possible.

Moreover, the contact plate having the flat non-circular shape
11 is fitted with the contact shift 9 which also has a flat non-circular outer peripheral shape, so that the rotation stop around the shaft center is performed as it is, so that the contact plate 11 does not need a special rotation stop mechanism. The careless rotation of the contact plate around the axis is blocked, the contact plate 11 rotates around the axis, and the contact plate 11 and the terminal plate
There is no problem that the contact with 14 is damaged.

[Effects] In summary, since the present invention is configured as described above, the forward / backward swing of the shift lever is performed by the movement of the contact shift accompanying the driving of the shift motor, and the impact A pair of terminal plates required to close the power supply circuit of the starter motor, which is capable of engaging gears that do not exist, are sandwiched from both sides in the radial direction of the starter motor with respect to the output shaft of the shift motor as in the past. It is not arranged like this, but it is arranged so as to be sandwiched from both sides in the direction around the shaft center of the starter motor, and since there is no terminal plate between both motors and on the outer diameter side of the shift motor, It is not necessary to secure a mounting space for the terminal plate not only between the shafts of both motors but also in the outer diameter direction.

Moreover, this and the contact shift and contact plate have a flat non-circular shape that bulges toward both sides in the direction around the shaft center of the starter motor, and the size in the radial direction is further reduced due to the flatness. In combination with what can be done, the starter itself can be a compact type that is small in the radial direction and has a projected area in the axial direction as small as possible.

In addition, the flat non-circular contact plate is fitted to the contact shift having the flat non-circular outer peripheral shape, so that the movement in the axial direction is allowed and the terminal plate elastically moves. In the contactable state, the rotation stopper around the shaft center is kept as it is, so the careless rotation of the contact plate around the shaft center is prevented without adopting a special rotation stop mechanism, and the contact plate and the terminal plate are prevented from rotating. There is no problem that contact is lost.

[Brief description of drawings]

FIG. 1 shows an embodiment of a starter according to the present invention. FIG. 1 is a sectional front view of a main part of the starter, FIG. 2 is a sectional plan view of the same part, and FIG. 3 is a front view of a contact plate. 4 and 5 are sectional views of the contact shift portion. In the figure, 1 is a case body, 2 is an output rotary shaft, 4 is a starter motor, 6 is a pinion gear, 7 is a shift motor, 7a is an output shaft, 7b is a helical spline groove, 8 is a ring gear, and 9 is a gear.
Is a contact shift, 11 is a contact plate, 13 is a shift lever, and 14 is a terminal plate.

Claims (1)

[Scope of utility model registration request] 1. A pinion gear (6) which is spline-fitted to an output rotary shaft from a starter motor (4) assembled in a case body (1) so as to be movable in an axial direction, and a pinion gear (6) of a shift lever (13). Due to the swing, the ring gear (8) on the internal combustion engine side
In the starter configured to engage and disengage with the shift motor, the shift motor (7) arranged parallel to the output rotation shaft of the starter motor is connected to the base end of the shift lever via a pin, and A contact shift (9) for engaging the output shaft from the shift motor with a helical spline at its base end and moving the shift motor in the axial direction to swing the shift lever, and to the starter motor. A pair of terminal plates (14) that are integrally supported on the case body side to form a power supply circuit are fitted to the outer periphery of the contact shift so as to be movable in the axial direction so as to face the terminal plates. The contact plate (11) that elastically contacts the terminal plate and closes the power circuit of the starter motor by the movement of the contact shift based on the drive. Further, the contact shift (9) has a flat non-circular shape in which an outer peripheral shape of a portion to which the contact plate is fitted swells in a direction around an axis of the starter motor. ,
While preventing rotation around the shaft center of the contact plate fitted to the outer periphery, the outer peripheral shape of the contact plate (11) also has a flat non-circular shape that bulges in the direction around the shaft center of the starter motor. The starter is characterized in that the pair of terminal plates (14) are arranged at positions sandwiching the output shaft of the shift motor from both sides in the axial center direction of the starter motor so as to correspond to the bulging portion of the contact plate.