JPH073017Y2 - 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.

In the engine starting device having the above structure, in order to ensure a high meshing accuracy of the pinion gear with respect to the ring gear, the casing for receiving the pinion gear and the crankcase of the engine are joined together by the brazing joint and further provided on the flange portion of the casing. The casing is fixed by screwing to the crankcase using the pair of fixing mounting holes. In addition, a fixing mounting seat surface having a flat surface orthogonal to the axis of the output shaft is provided around the mounting hole, and the seat surface is brought into contact with the corresponding fixing surface of the crankcase, so that the output shaft of the assembly is assembled. Prevents runout.

By the way, when the ring gear and the pinion gear mesh with each other to start the engine, a load is applied to the pinion gear, and an acting force is applied to the fixing mounting seat surface with the brazing joint as a fulcrum. At this time, in the above-mentioned conventional structure, since the fitting boss portion that constitutes the anchor joint portion is continuously provided from the flange portion having the fixing mounting seat surface, the flange portion is relatively large. A bending moment is generated, and a relatively large load is applied to the fixing mounting seat surface. Therefore, in order to secure sufficient rigidity of the fixing mounting seat surface portion, there is a problem that the flange portion becomes thick and large.

<Problems to be Solved by the Invention> In view of the above-mentioned problems of the prior art, the main purpose of the present invention is to start an engine capable of ensuring sufficient rigidity without increasing the size of the fixing mounting seat surface portion. To provide a device.

[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. A casing supporting the shaft, and a fitting boss portion provided on the casing coaxially with the drive shaft to couple the part of the casing to the engine so that the pinion gear is immersed in the engine, A mounting flange portion projecting outward in the radial direction with respect to the axis of the drive shaft on a side of the casing opposite to the ring gear side of the fitting boss is orthogonal to the axis of the drive shaft. In an engine starting device having a flat mounting surface and a fixing mounting seat surface provided on the mounting flange portion, in the mounting flange portion side edge of the fitting boss portion and the front It is accomplished by providing a starter system for an engine, wherein a step is provided in the axial direction between the fixing attachment flange.

<Operation> By doing so, it is possible to provide a step having no step in the axial direction between the mounting flange side edge of the fitting boss and the fixing mounting seat surface. Since the arm length of the moment due to the load applied to the pinion gear with the joined fitting boss as a fulcrum can be shortened, the acting force applied to the fixing mounting seat surface is reduced and the fixing mounting seat surface is It is possible to secure sufficient rigidity without increasing the size.

<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 gear covers as a casing that receives a pinion gear 12 and the like described later.
It is sandwiched and fixed between 13 and the casing 2b of the motor 2. 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. A planetary gear 9b is pivotally supported on a radially outward flange portion formed on the right end portion of the figure, which is supported and is received in the center bracket 11 of the drive shaft 16.

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. A pinion gear 12 for driving a ring gear 30 of the engine is integrally provided at a tip end portion in the axial direction on the left side of the clutch inner 19 in the drawing.

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 clutch outer to rotate while rotating by the helical spline of the spline coupling 17.
Since 18 is pushed out, the clutch inner 19 or the pinion gear 12 meshes with the ring gear 30 of the engine. Then, the internal contact is closed with the suction operation of the plunger 26, the motor 2 is rotated, the rotation is decelerated by the planetary gear unit 9 and transmitted to the pinion gear 12, the ring gear 30 is rotated, and the engine is rotated. You can

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 side of the fitting boss portion 31 of the gear cover 13, as shown in FIG. Portions 33a and 33b are formed. A bolt insertion hole 3 is provided on the protruding end of one of the mounting flanges 33a.
4 is provided, and the other mounting flange 33b has a screw hole 35
, Respectively, are provided as fixing mounting holes. Further, in the gear cover 13, fixing mounting seat surfaces 36a and 36b are smoothly formed around the holes 34 and 35 of the mounting flange portions 33a and 33b, respectively.
An assembling jig seat surface 38 is provided for supporting the gear cover 13 at three points in cooperation with the two fixing mounting seat surfaces 36a, 36b by the assembling jig when the gear cover 13 is assembled.

As shown in FIG. 3, when the starter 1 is attached to the transmission case 32, the annular boss portion 31 and the fitting hole 32a of the transmission case 32 are anchored to each other and are fixed to each other. Mounting seats 36a, 36b and mission case
The runout at the time of mounting is regulated between 32 and the corresponding fixed surfaces 32b.

In this starter 1, the distance a shown in FIG. 3 is provided between the end 31a of the fitting boss 31 on the side of the mounting flanges 33a, 33b and the fixing mounting seats 36a, 36b. There is a step due to. Therefore, as shown in FIG. 3, when the load F is applied to the pinion gear 12 with the ring gear 30 and the pinion gear 12 meshing with each other at the time of starting, the fixing boss 31 is fixed by the moment with the fitting boss portion 31 as a fulcrum. Mounting surface
The acting force R is applied to 36a and 36b. The directions of the load F and the acting force R in the figure are for explanation. Ring gear 30
And the fixing mounting seat surfaces 36a and 36b, and the distance between the ring gear 30 and the end of the fitting boss is equal, that is, the fixing mounting seat and the end of the fitting boss are With respect to the same thing, the arm length of the moment from the end edge 31a of the fitting boss portion 31 as a fulcrum to the ring gear 30 as a load input point is shortened by the step distance a (La). Since the moment on the input side becomes smaller, the acting force R becomes smaller. Therefore, from the shaft center of the output shaft 16 to the fixing mounting seat surfaces 36a, 3a
The length in the radial direction up to 6b can be relatively shortened, the mounting flange portions 33a and 33b can be downsized, and the entire starter 1 can be downsized.

[Effects of the Invention] According to the present invention, as described above, when the fixing mounting seat surface and the edge of the fitting boss are the same, the load input point is changed from the edge of the fitting boss as a fulcrum. As the arm length of the moment to the ring gear is shortened by the distance of the step, the moment on the input side is reduced and the acting force on the fixing mounting seat surface is also reduced. Can be downsized, so that the entire starting device can be downsized.

[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 an explanatory view showing the operation based on the present invention. 1 ... Starter, 2 ... Motor 2a ... Motor shaft, 2b ... Casing 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 toothed 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 coupling part, 18 ... Clutch outer 19 ... Clutch inner, 20 ... switch terminal 21 ... annular recess, 22 ... shift lever 22a ... actuating 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, 32 ... Mission case 32a ... Fitting hole, 32b ... Fixing surface 33a, 33b ... Mounting flange 34 ... Bolt insertion hole, 35 ... Holes 36a, 36b ... Fixing mounting seat surface 38 ... Assembling 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 rotatably supporting the drive shaft, and one of the casings for immersing the pinion gear in the engine. The drive shaft on the side opposite to the fitting boss portion provided on the casing coaxially with the drive shaft so as to connect the portion to the engine by the wax, and the ring gear side of the fitting boss portion of the casing. An engine having a mounting flange portion projecting outward in the radial direction with respect to the axis of the shaft, and a fixing mounting seat surface provided on the mounting flange portion with a flat surface orthogonal to the axis of the drive shaft. The starting device for a vehicle is characterized in that a step is provided in the axial direction between the mounting flange portion side edge of the fitting boss portion and the fixing mounting seat surface. Starting device for engine to collect.