JPH073016Y2 - Engine starter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] <Industrial field of application> The present invention relates to an engine starting device, and more particularly to an engine starting device having an improved attachment structure to an engine.

<Prior Art> Conventionally, there are various types of starting devices for starting an engine. For example, as disclosed in Japanese Utility Model Laid-Open No. 61-53568, a direct current motor is used to drive a reduction gear device. Selectively meshes the driven pinion gear with the ring gear of the engine according to whether the electromagnetic switch is on or off,
Some start the engine.

When assembling the above-described engine starting device, generally, a pair of fixing mounting seat surfaces, which are provided symmetrically with respect to the axis of the casing that receives the pinion gear, contact the corresponding surfaces of the assembling jig. The casing is placed on a jig so that the axis is in an upright state by assembling, and the assembly is performed. As mentioned above, it is almost
Since the mounting seats for fixing are provided at symmetrical positions of 180 degrees, especially when pushing the drive shaft into the bearing of the casing, the pushing force is applied to both of the symmetrical positions on the line passing through the drive shaft. It can be received by the mounting seat surface, and a stable supporting state of the casing can be secured.

By providing a pair of mounting holes at asymmetrical positions with respect to the drive shaft, the degree of freedom in mounting between the starter and the engine is increased, and the degree of freedom in designing the mounting portions of both is increased. However, if the fixing mounting seat surfaces provided around the respective mounting holes are in asymmetrical positions with respect to the drive shaft, both fixing mounting seat surfaces are brought into contact with the jig surface in the same manner as described above, and the casing is removed. When the drive shaft is mounted on a jig and pushed into the bearing of the casing to assemble, a moment is generated with respect to both fixing mounting seat surfaces due to the pushing force, resulting in a problem of poor assembly workability.

<Problems to be Solved by the Invention> In view of the problems of the prior art as described above, the main purpose of the present invention is to reduce the mounting flexibility between the starter and the engine without impairing the assembly workability. An engine starter that can be made large.

[Structure of the Invention] <Means for Solving the Problems> According to the present invention, a drive shaft supporting a pinion gear connected to an electric motor for driving a ring gear of an engine and the drive shaft are provided. It has a casing supporting the shaft, an engine mounting flange portion provided on the casing, and a pair of fixing mounting seat surfaces provided on the engine mounting flange portion with a flat surface orthogonal to the axis of the drive shaft. In the engine starting device, the both fixing mounting seat surfaces are provided at asymmetrical positions with respect to the axis, and the side on which the both fixing mounting seat surfaces are provided with the axis of the casing interposed therebetween. This is achieved by providing an engine starting device characterized in that an assembly jig seat surface having the same flat surface as the fixing mounting seat surface is provided on opposite sides.

<Operation> In this manner, the pair of fixing mounting seat surfaces and the assembly jig seat surface are brought into contact with the corresponding support surfaces of the jig so that the axis line is in the vertical state. By mounting the casing on the casing, the casing can be stably supported by the three-point support against the pushing force in the axial direction when the drive shaft is assembled into the casing, and the assembly work can be performed stably. In addition, it is not necessary to provide both fixing mounting seat surfaces at symmetrical positions with respect to the drive shaft, and the degree of freedom of mounting with the engine is large.

<Embodiment> Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the whole of a starter 1 with a speed reducer as an engine starting device to which the present invention is applied. The starter 1 generates a rotational force necessary for starting an engine by rotating a DC motor 2. To do. The right end of the motor shaft 2a of the DC motor 2 in the figure is rotatably supported by a ball bearing 5 fixed to an end cover 4 covering the commutator 3, and the left side of the figure is a separator 6 as an end plate of the motor 2. It is rotatably supported by a metal bearing 7 which is fixed to the.

A planetary gear unit 9 as a reduction gear device is provided on the left side of the motor shaft 2a in the figure. A sun gear 9a is formed on the left protruding end of the motor shaft 2a, and a planetary gear 9b meshes with the sun gear 9a. There is. A center bracket 11 having large and small cylindrical portions coaxially formed in the axial direction is superposed on the left side portion of the separator 6 in the drawing, and an internal ring gear 9c is fixed to the large diameter cylindrical portion of the center bracket 11. The planetary gear unit 9 is received in a space defined by the separator 6 and the center bracket 11.

The separator 6 and the center bracket 11 are fixed by being sandwiched between a motor case 2b and a gear cover 13 as a casing that pivotally supports a drive shaft 16 that supports a pinion gear 12 described later. By the metal bearing 14 fixed to the left protruding end of the gear cover 13 in the drawing and the roller bearing 15 provided on the small diameter cylindrical portion of the center bracket 11, both ends of the drive shaft 16 are coaxial with the motor shaft 2a. Supported and drive shaft 16
A planetary gear 9b is pivotally supported on a radially outward flange portion formed in the right end portion of the figure received in the center bracket 11 of FIG.

Between the outer peripheral surface of the intermediate portion of the drive shaft 16 and the inner peripheral portion of the clutch outer 18 of the one-way roller clutch as a one-way clutch, a spline coupling portion 17 formed by a helical spline is used.
And the clutch inner 19 of the drive shaft 16
It is fitted so as to be rotatable and slidable in the axial direction. At the left axial end of the clutch inner 19 in the figure,
Pinion gear for driving the engine ring gear 30
12 are provided integrally.

The clutch outer 18 is provided with an annular concave portion 21 in the circumferential direction, and the bifurcated operating end portion 22a of the shift lever 22 is engaged therewith. The shift lever 22 is received in a radially outward peninsular portion 13a formed integrally with the gear cover 13, and the yoke 2 of the electromagnetic switch 23 coupled to the peninsular portion 13a.
A middle portion of the shift lever 22 is swingably supported by a support bracket 25 sandwiched between the 4 and the peninsula-shaped portion 13a. One free end of the spring 27 is connected to the plunger 26 of the electromagnetic switch 23.
An intermediate portion of 27 is supported by a support bracket 25, and the other free end of the spring 27 is engaged between the pivot of the shift lever 22 and the operating end 22a. The free end 22b of the shift lever 22 opposite to the operating end 22a is also formed in a bifurcated shape, and the free end 22b is formed by the plunger 26 of the spring 27.
It is adapted to resiliently contact the side free end. Therefore, the plunger due to the attraction force due to the excitation of the electromagnetic switch 23 and the biasing force of the return spring inside the electromagnetic switch 23 when not excited
The shift lever 22 can swing with the movement of 26.

A battery (not shown) is electrically connected to the battery connection terminal 28 of the electromagnetic switch 23, and an ignition switch (not shown) is electrically connected to the switch terminal 20.
The motor connection terminal 29 of the electromagnetic switch 23 and the motor 2 are electrically connected to each other. When the ignition switch is set to the starter-on state, the electromagnetic switch 23 is excited and the plunger 26 is attracted, and the shift lever 22 is rotated via the spring 27 in the clockwise direction in the figure. The operating end 22a of the shift lever 22 allows the spline joint 17
Since the clutch outer 18 is pushed out while rotating by the helical spline, the clutch inner 19 or the pinion gear 12 meshes with the ring gear 30 of the engine. And
With the suction operation of the plunger 26, the internal contact is closed and the motor 2 is rotated. The rotation is reduced by the planetary gear unit 9 and transmitted to the pinion gear 12, the ring gear 30 is rotated, and the engine can be rotated. .

Even when the pinion gear 12 does not engage with the end faces of the teeth of the ring gear 30 during the movement of the plunger 26, the spring 26 bends and the plunger 26 is completely attracted, so the contact of the electromagnetic switch 23 closes. The motor 2 rotates, and the rotation of the motor 2 can further rotate the pinion gear 12, and the pinion gear 12 can be reliably meshed with the ring gear 30.

In the vicinity of the base end portion on the right side in FIG. 1 of the gear cover 13 of the starter 1 constructed in this way, an outer peripheral surface for fitting the brazing shaft is coaxial with the drive shaft 16 so as to be mounted on the mission case 32 of the engine. A fitting boss portion 31 that has a general purpose is formed, and at the base end portion of the gear cover 13, a pair of engine mounting flange portions 33a and 33b protruding outward in the radial direction as shown in FIG. Has been formed. A bolt insertion hole 34 is provided at the projecting end of one engine mounting flange portion 33a, and the other engine mounting flange portion 33b.
Each of the screw holes 35 is provided as a fixing mounting hole.

To attach the starter 1 to the mission case 32, insert the fitting boss portion 31 into the corresponding fitting hole of the mission case 32, and screw it to the mission case 32 using the bolt insertion hole 34 and the screw hole 35. The starter 1 is fixed.
Further, on the mounting surface side of each engine mounting flange portion 33a, 33b to the mission case 32, for fixing to consist of a flat surface along a surface orthogonal to the axis of the drive shaft 16 in order to regulate runout during mounting. Mounting seat surfaces 36a, 36b are formed around each hole 34, 35. Further, the gear cover 13 is provided with an assembly jig seat surface 38 having the same flat surface on the side opposite to the side on which the both fixing mounting seat surfaces 36a and 36b are provided with the drive shaft 16 interposed therebetween. ing.

In this embodiment, for example, the shaft center of the drive shaft 16 and both holes are arranged so that the starter 1 is mounted along the side surface of the V-type engine.
An opening angle formed by a line connecting each axis of 34 and 35 is approximately 120 degrees, and both fixing mounting seat surfaces 36a and 36b are provided at asymmetrical positions with respect to the drive shaft 16, respectively. Therefore, it is possible to reduce the portion that interferes with the engine with respect to the conventional starter that has a pair of fixing mounting seat surfaces that are provided at symmetrical positions of about 180 degrees with the drive shaft interposed therebetween, and thus it is possible to mount the engine freely. By increasing the degree and appropriately determining the opening angle according to the change in the shape of the side surface of the engine, it is possible to secure a suitable mounting state for the engine of various shapes.

In addition, the drive shaft is attached to the gear cover 13 to assemble the starter 1.
When the 16 is assembled, as shown in FIG. 3, the both fixing mounting seat surfaces 36a and 36b and the assembly jig seat surface 38 are attached to the assembly jig 37.
Of the drive shaft 16 with the gear cover 13 placed on the assembly jig 37 so that the axis of the gear cover 13 is upright with respect to the assembly jig 37. Assemble the part by inserting it into the metal bearing 14 of the gear cover 13. Therefore, the gear cover 13 can be stably fixed in the three-point supporting state against the pushing force in the axial direction, and the drive shaft 16 is fixed to the gear cover.
The gear cover 13 does not tilt when it is assembled into the gear 13, and the assembly work can be performed in a stable state.

[Advantages of the Invention] According to the present invention, the pair of fixing mounting seat surfaces are provided at asymmetrical positions with respect to the drive shaft. The seat surface can be arranged appropriately, the degree of freedom in mounting the engine starter is increased, and when assembling the starter, the casing is assembled with three points, the mounting seat surface for both fixings and the assembly jig seat surface. Since the casing can be supported in a stable state by receiving it with the jig for assembly, the workability of assembling is good.

[Brief description of drawings]

FIG. 1 is a diagram showing an entire engine starting device to which the present invention is applied. FIG. 2 is an end view taken along the line II in FIG. FIG. 3 is a diagram showing a state in which the drive shaft is incorporated in the casing. 1 ... Starter, 2 ... Motor 2a ... Motor shaft, 2b ... Motor case 3 ... Commutator, 4 ... End cover 5 ... Ball bearing, 6 ... Separator 7 ... Metal bearing, 9 ... Planetary gear unit 9a ... Sun gear, 9b ... Planetary gear 9c … Internal tooth ring gear, 11… Center bracket 12… Pinion gear, 13… Gear cover 13a… Peninsular part, 14… Metal bearing 15… Roller bearing, 16… Drive shaft 17… Spline joint, 18… Clutch outer 19… Clutch inner, 20 ... Switch terminal 21 ... Annular recess, 22 ... Shift lever 22a ... Operating end, 22b ... Free end 23 ... Electromagnetic switch, 24 ... Yoke 25 ... Support bracket, 26 ... Plunger 27 ... Spring, 28 ... Battery connection terminal 29 … Motor connection terminal, 30… Ring gear 31… Fitting boss part, 32… Mission case 33a, 33b… Engine mounting flange part 34… Bolt insertion hole, 35… Screw hole 36a, 36b… Mounting surface for fixing 37 ... Assembly jig, 38 ... Assembly jig seat surface

Claims (1)

[Scope of utility model registration request] 1. A drive shaft supporting a pinion gear connected to an electric motor for driving a ring gear of an engine, a casing pivotally supporting the drive shaft, an engine mounting flange portion provided on the casing, and the drive. In an engine starting device having a pair of fixing mounting seat surfaces provided on the engine mounting flange portion with a flat surface orthogonal to the axis of the shaft, the both fixing mounting seat surfaces with respect to the axis. Assembly jig that is provided in an asymmetrical position and has a flat surface that is the same as the fixing mounting seat surface on the side opposite to the side where the fixing mounting seat surfaces are provided with the axis line of the casing interposed therebetween. A starting device for an engine, which is provided with a seat surface.