KR930001168B1 - Coaxial starter - Google Patents

Abstract

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Description

Coaxial starter

1 is a front sectional view of the main part of the coaxial starter according to an embodiment of the present invention.

2 (a) is a diagram showing the state of winding in the slot of the armature core;

Fig. 2 (b) is a diagram showing the in-slot winding state of the armature core in a conventional coaxial starter.

3 and 4 are front views of main parts breaking of the coaxial starter according to the second and third embodiments.

5 is a cross-sectional view of a conventional coaxial starter.

* Explanation of symbols for main parts of the drawings

16,50: roller 17,49: clutch inner

20,45,53: pinion shaft 24: electronic switch

4,4a, 40: Armature rotating shaft 41,47: Clutch outer

4a, 41a, 47c: cam face 42, 48: spline fitting

The present invention relates to a coaxial starter in which an operating shaft of an electronic switch and an electronic rotating shaft of an electric motor are arranged on the same axis.

Conventionally, some of these types of coaxial starters are described in, for example, Japanese Patent Application Laid-Open No. 63-181643, which is shown in the fifth. In Fig. 5, 1 is an armature of a direct current motor, 2 is an armature core, and an armature coil 3 is recommended in the slot. 4 is an armature rotating shaft in which a cam surface 4a on the wedge surface constituting the overrunning clutch function is formed inside the hollow, and the armature core 2 is press-fitted to the outside of the rotating shaft 4. 5 is a face-type condenser attached to the rear outer periphery of the rotating shaft 4, and the surface which contacts with the blush 6 and slides and rectifies is comprised in the surface perpendicular to the rotating shaft 4. As shown in FIG. The end of the armature coil 3 is connected to the concentrator 5. The brush 6 is pushed forward by the spring 6a disposed at the rear side thereof, and the tip of the brush 6 is pressed against the sliding surface of the concentrator 5 in contact with it. 7 is a permanent magnet which generates a magnetic field in the armature 1, and is provided in plurality in the inner periphery of the yoke 8 used as a magnetic path. The rear end of the yoke 8 is fitted to the rear bracket 9, and the front end of the yoke 8 is fitted with the front bracket 10. 11 is a bearing attached to the rear end of the rotating shaft 3, and is fitted to the rear bracket 9. The rear bracket 9 has a hole equal to the number of the brushes 6 in accordance with the position of the brush 6 on the outer circumference of the concave portion for inserting the bearing 11 so that the brush 6 can abut the condenser 5. Is installed.

12 accommodates the brush 6 and the spring 6a, insert-forms the fixed contact 13 which connects with the terminal which is not shown in the back part, and attaches to the fixed contact 13. The terminal 14 which welded the lead wire 6b of the brush 6 of the side is the brush holder made of the plastic which was fixed by the screw 15. As shown in FIG. 16 is a roller provided in the cam surface 4a formed in the inner surface of the rotating shaft 4, and completes an overrun function with a roller spring. Reference numeral 17 denotes a clutch inner of the overrunning mechanism, which sandwiches the bearing 18 on the outer periphery of the intermediate portion, and supports the front end of the rotation shaft 4.

19 is a bearing fitted inside the front bracket 10, and supports the front end of the clutch inner 17. As shown in FIG. 17a is a helical spline formed on the inner surface of the clutch inner 17, and the heli is installed on the outer circumference of the middle portion of the pinion shaft 20 having the pinion 20a and the tip 20b for waterproofing the dust film at the tip. It is fitted so that it can slide back and forth with the knife spline 20c. 21 is a stopper mounted to the rear of the pinion shaft 20, 22 is a bearing blade fitted to the inner surface of the clutch inner 17 to support the rear of the pinion shaft 20, and the bearing 22 is the pinion shaft 20. The front end of the return spring 23 is received. The pinion shaft 20 moves along the axis while bending the spring 23 by the stopper 21 during the forward movement, and the stopper 21 completes the forward movement when it comes in contact with the rear end surface of the clutch inner 17.

24 is an electronic switch which is coupled to the rear bracket 9 by the bolt 25, and has a function of moving the pinion shaft 20 forward and closing the contact to enable power supply from the battery to the motor by closing the key switch. ON has a switching function. 26 is a moving assembly which pressed the pinion shaft 20 from the back and provided the movable contact 28 through the insulators 27a and 27b in the outer peripheral part. In this moving assembly 26, 26a is a flanger, 26b is a rod which is an operating shaft of the electronic switch 24, 26c is a second holder, 26d is fixed between the flapper 26a and the rod 26b, It is a 1st holder in which the movable contact 28 etc. were attached.

The rod 26b is attached to the rear end of the flanger 26a by caulking. 29 is a spring for pushing the pinion shaft 20, and is provided on the outer circumference of the rod 26b between the first holder 26d and the second holder 26c. 30 is a 3rd holder and presses the pinion shaft 20 by the press spring 31. As shown in FIG. 32 is a steel ball provided between the front end face of the third holder 30 and the rear concave portion of the pinion shaft 20, and has a function of receiving slag. 33 is an excitation coil which adds force to the flanger 26a, and is recommended for the plastic bobbin 33a, 34a is the core at the rear, 34b is the core at the front, and together with the case 35 constitutes a gyro. . 36 is a nonmagnetic plate, a stopper when returning to the rear of the flanger 26a, and forms a rear wall of the electronic switch 24. 37 is a packing installed between the case 35 and the plate 36, and has a waterproof function. 38 is a spring for returning the moving assembly 26 to its original position when the key switch is turned off, and is provided between the flanger 26a and the front core 34b. 39 is a volt | bolt, and combines the rear bracket 9 and the front bracket 10. As shown in FIG.

Next, the operation of the coaxial starter having the above configuration will be described.

First, in the state where the key switch (not shown) is turned off, the excitation coil 33 is not energized and is not energized, and only the force of the spring 38 is applied to the flanger 26a, so that the moving assembly 26 is located at the rear. , The flanger 26a is in contact with the plate 36. In this state, since the fixed contact 13 and the movable contact 28 are open and separated, the electric motor is stopped and the pinion shaft 20 is also attached to the rear position by the spring 23 and the tip 20b. The rear face of the abutment comes into contact with the front end face of the clutch inner 17 to stop.

Next, when the key switch is turned on, the excitation coil 33 is energized, and the franchiser 26a is energized, the moving assembly 26 moves forward, and the movable contact 28 is connected to the fixed contact 13. Abuts. Therefore, the electric motor is energized through the armature coil 3 via the brush 6 and the condensor 5. On the other hand, the pinion shaft 20 is pushed forward by the pressing springs 29 and 31 of the moving assembly 26, and the ring gear and the pinion 20a provided on the outer circumference of the flywheel of the engine at the same time the DC motor is started up, Start to engage. Immediately after the engine is started, the pinion shaft 20 and the clutch inner 17 move together with the ring gear by the unidirectional overrun action, and revolve with the armature 1.

When the key switch is turned off by the start-up, current is cut off, the moving assembly 26 is returned to the rear by the action of the spring 38 in the electronic switch 24, and the pinion shaft 20 is connected to the spring 23. It returns by action.

The conventional coaxial starter has the following problems because it is configured as described above.

(I) The armature rotating shaft 4 also serves as the clutch outer of the overrunning clutch. For this reason, assembling of the starter stops the roller 16 on the armature rotating shaft 4, and attaches the clutch inner 17 provided with the pinion shaft 20 to it, and the overrunning clutch cannot be assembled as a unit. . Therefore, even in the case of evaluating the overrunning clutch function itself, for example, it cannot be evaluated only after assembly of the armature 1, and it involves a lot of loss by performing quality control in production.

(II) When the roller 16 is mounted on the armature rotating shaft 4, the inside of the armature rotating shaft 4 has a deep inner row and a small inner diameter, and an armature coil 3, etc. protrudes toward the axis of the armature I. Therefore, it is difficult for resin or jig to enter, obstructs the mounting of the roller 16, the shape of the roller 16 is thin and long, and the workability at the time of mounting the roller 16 is very deteriorated.

(III) Since the overrunning clutch mechanism is arranged in the armature rotating shaft 4, the outer diameter cannot be increased as the overrunning clutch, and thus the clutch capacity cannot be sufficiently obtained. That is, even if the roller 16 for increasing the clutch capacity is extended in the axial direction, the effective roller length contributing to the capacity is not expected to be large due to uneven contact of the cam surface 4a. The influence on the clutch is in the relationship of the clutch outer diameter (D)> clutch shaft direction length (L), so that the increase in the length (L) was disadvantageous for the increase in the clutch capacity.

(IV) In the conventional coaxial stutter, since the pinion side 20 protrudes larger than the front bracket 10 as described above, the overall length becomes large, and there is a problem that the engine is difficult to install.

In general, the coaxial starter tends to have a large electric field compared to a so-called parallel biaxial starter installed on the axis line where the electronic switch operating shaft and the armature rotation shaft are different, so there is a strong demand for shortening the electric field in terms of mounting to the engine. Therefore, it was necessary to solve the problems of (I) to (III) above without increasing the overall length of the starter.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, which is advantageous in terms of quality control, good workability, sufficient clutch capacity can be obtained, and the overall length can be shortened, and the device workability to the engine is also good. The purpose is to get.

The coaxial starter according to the first embodiment of the present invention is provided with means for engaging the overrunning clutch device with the clutch outer and the armature rotating shaft by rotating and stopping in the rotational direction to enable torque transmission between the clutch outer and the armature rotating shaft. will be.

The coaxial starter according to the second embodiment of the present invention is such that the pinion gear formed at the tip of the pinion shaft fitted with the spline fitting of the clutch inner of the overrunning clutch device and the bearing supporting the clutch inner are overlapped in the radial direction.

The coaxial starter according to the third embodiment of the present invention supports the pinion shaft for spline fitting to the inner circumferential side of the clutch inner, supporting the clutch inner front end portion of the overrunning clutch device as a front bracket, and the pinion gear at the distal end thereof. It is provided so as to overlap the bearing in the radial direction, and the clutch outer body part is installed in the main part in the armature coil end part, and a rotation stop engaging means is provided in the rotational direction of the clutch outer rear part and the armature rotating shaft, and the clutch outer and armature rotating shaft This enables torque transmission.

In the first embodiment, when assembling the coaxial starter, the overrunning clutch device is assembled into a single body and then fitted into the armature rotating shaft. Therefore, the assembling work of the armature and the overrunning clutch device becomes easy, and even when performing the function evaluation of the overrunning clutch device, the armature assembly is not necessary and can be performed only by the overrunning clutch device alone.

In the second embodiment, since the pinion gear is disposed so as to overlap the bearing in the radial direction, the pinion shaft does not protrude or only protrudes slightly. Therefore, the length of the starter is shortened, and the pinion side does not disturb the operation of the device even when the device is mounted to the engine.

In the third embodiment, since the armature and the overrunning clutch device are separable, the assembling work of the armature and the overrunning clutch device is easy, and only the overrunning clutch device can be performed.

Since the pinion gear is arranged radially with the bearing, the pinion shaft hardly protrudes from the front bracket, and the starter length is shortened. Since the overrunning clutch device is located on the inner circumferential side of the armature coil in front of the armature core, the diameter of the overrunning clutch device is increased and the clutch capacity is increased.

1 is a front view of a part of the coaxial starter broken according to the first embodiment of the present invention. In the figure, the same code | symbol is attached | subjected to the corresponding part like a conventional apparatus, and the description is abbreviate | omitted. 40 is an armature rotating shaft, the clutch outer part 41 of the overrunning clutch apparatus is arrange | positioned by spline fitting on the inner peripheral side, and 42 has shown the spline fitting part. The cam face 41a is formed inside the clutch outer 41, and the roller 16 is provided between this cam face 41a and the clutch inner 17, and the overrun clutch apparatus is comprised by these. The front end of the clutch outer 41 is supported by a bearing 18 fitted to the clutch inner 17.

An armature core 43 is press-fitted to the outer circumference of the armature rotating shaft 40, and two armature coils 44 are provided in each slot as shown in FIG. 2 (a). In other words, in the present embodiment, as shown in Fig. 2 (b), two armature coils 3 per slot are provided per slot. Since the pinion 20a having a dimension of eight or more is conventionally used as seven pinions 20d in this embodiment, the relative torque with respect to the ring gear of the engine is increased, so that a torque equivalent to that of the starter can be obtained. This is because the number of turns of the armature coil 44 can be reduced. According to the structure of the armature core 43, the shaft diameter of the armature rotating shaft 40 can be increased, so that the spline fitting portion 42 can be formed, and the strength of the clutch outer 41 can be ensured. have. Moreover, although the spline fitting of the armature rotating shaft 40 and the clutch outer 41 was spline-fitted in the said Example, it was not limited to this, but they made the engagement which can transmit torque, but it is not limited to this, They transmit torque Any engagement may be possible, such as a key fit or a press fit.

In the above embodiment, splines are provided on the entire outer circumferential surface of the clutch outer 41, but end portions having different diameters are provided on the outer circumferential surface of the clutch outer 41, and splines are formed only on the outer circumferential surface of the large diameter side, so that the armature rotating shaft 40 The spline fitting may be performed.

3 is a front view of a part of the coaxial starter broken according to the second embodiment of the present invention. 45 is a pinion shaft, and the pinion gear 45a of the front end is arrange | positioned so that it may overlap radially with the bearing 19 which supports the clutch inner 17. As shown in FIG. That is, the inner periphery of the front end of the clutch inner 17 is expanded, and it is comprised so that all the parts of the pinion gear 45a formation of the pinion shaft 45 may be located in the said enlarged diameter part, ie, the through-hole 17c. For this reason, the tip of the pinion shaft 45 does not protrude from the front end of the front bracket 10 but is located slightly rearward from the front face. In the present embodiment, the pinion gear 45a has a dimension of eight or more sheets.

For this reason, it is easy to arrange | position the pinion gear 45a inside the clutch inner 17, and since the relative torque as a starter increases, when the torque equivalent to the former is obtained, the armature core 2 becomes shorter in length, As a result, the starter battlefield is built up.

In addition, 45b is a tip part which abuts on the edge part 17d of the clutch inner 17 at the starter non-operation, and 45c is a helical spline which fits the helical spline to the helical spline 17a of the clutch inner 17. As shown in FIG.

As the other configurations and starters, the starting operation is the same as that of the conventional apparatus, and the corresponding parts are given the same reference numerals and the description thereof is omitted.

In addition, in this embodiment, the pinion gear 45a and a part of the bearing 19 overlap the radial direction so that the front end face of the pinion shaft 45 is located slightly rearward from the front face of the front bracket 10 when the starter is not operated. Although it arrange | positioned, in particular, it is not limited to this structure, If the pinion gear 45a and the bearing 19 overlap radially, the tip of the pinion shaft 45 may protrude somewhat rather than the front bracket 10. As shown in FIG.

4 is a partially broken front view of the coaxial starter according to the third embodiment of the present invention. In the drawing, corresponding parts are denoted by the same reference numerals as in the conventional apparatus of FIG. 5, and description thereof is omitted. 45 is an overrunning clutch, and the clutch outer 47 has a main body portion 47a on the front side located on the inner circumferential side of the armature coil end 3a, and a rear portion 47b on the inner side of the armature rotating shaft 4a '. Straight spline fitting, armature rotating shaft 4a 'is made into a separate body, and 48 has shown the spline fitting part.

The outer diameter of the main body portion 47a of the clutch outer 47 is slightly larger than the armature rotation shaft 4a ', and a roller 50 is provided between the inner cam surface 47 and the clutch inner 49. The front end of the clutch inner 49 is supported by a bearing 51 fitted to the front bracket 17, and a bearing 52 is provided between the outer peripheral portion of the clutch inner 49 and the rear portion 47b of the clutch outer 47. It is installed. A helical spline 49a is formed on the inner circumference of the clutch inner 49, and spline-fits with the helical spline 53a of the pinion shaft 53 provided inside the clutch inner 49 and the armature rotating shaft 4a '. have. The inner circumferential portion of the front end of the clutch inner 49 is enlarged, and the pinion gear 53b at the tip of the pinion shaft 53 is radially overlapped with the bearing 51 in the enlarged diameter portion 49b. The amount of protrusion of the pinion shaft 53 at ') is small. The number of pinion gears 53b is seven or less.

The coaxial starter configured as described above does not require an armature assembly as in the prior art even when the overrunning clutch 46 is separate from the armature rotating shaft 4a ', and the function evaluation of the overrunning clutch 46 is performed. In addition, since the armature rotating shaft 4a 'is quenched, wear prevention of the spline fitting portion 48 is prevented, and the armature rotating shaft 4a' and the armature core 43 can be easily fixed by the cylinder 54. have.

Since the overrunning clutch 46 is arrange | positioned at the inner peripheral side of the armature coil edge part 3a, a clutch outer diameter can be enlarged and therefore sufficient clutch capacity can be obtained. In this case, the shaft length is slightly increased as compared with the conventional one in which the overrunning clutch device is disposed in the armature rotating shaft 4a ', but the pinion gear 53b is disposed so as to overlap the bearing 51 in the radial direction. Since the shaft length of the shaft 53 is shortened, the shaft length by the overrunning clutch 46 can be absorbed by this shortened portion. Since the pinion gear 53b having eight or more dimensions is set to seven or less, it is easy to arrange the pinion gear 53b inside the clutch inner 49, and the relative coke as a starter increases, thereby obtaining torque equivalent to the conventional one. In this case, the electric field of the armature core 2 can be shortened, and in these, the electric field of the starter can be made as follows.

Further, in the above embodiment, spline fitting of the armature rotating tucks 4a 'and the clutch outer 47 is not limited thereto. For example, the rotation stops in the rotational direction such as key fitting or press fitting. Other engagement is also good if the configuration is performed.

As described above, according to the coaxial starter of the first embodiment of the present invention, since the armature rotating shaft and the clutch outer are engaged with each other so that torque transmission is possible, even when performing the function evaluation of the overrunning clutch device, only the overrunning clutch device is used. It is advantageous in terms of management, and the assembling work becomes easy.

According to the coaxial starter of the second embodiment of the present invention, since the pinion gear at the tip of the pinion shaft and the bearing for supporting the clutch inner overlap each other in the radial direction, the pinion shaft hardly protrudes from the starter body, thus shortening the overall length. The effect of the apparatus workability is also good also in the apparatus to the engine which was made into a high density, and was made high.

According to the coaxial type starter of the third embodiment of the present invention, the armature rotating shaft and the clutch outer are rotated and engaged, the overrunning clutch device is arranged on the inner circumferential side of the armature coil end, and the pinion gear supports the clutch inner front end. Since it is configured to overlap the bearing in the radial direction, it is advantageous in quality control, easy to assemble and obtain a sufficient clutch capacity, there is an effect that can reduce the overall length of the clutch.

Claims (1)

The motors 1 and 7 having the bracket 10 and the hollow armature rotating shaft 4a 'and one side of the armature rotating shaft 4a' are provided, and the operating shaft thereof is almost the same as the armature rotating shaft 4a '. It has an electronic switch 24, a clutch outer 41, a clutch inner 17, and a through hole 17c disposed on an axis, and the clutch outer 41 is coupled to the armature rotating shaft 4a 'to transmit torque. And an overrunning clutch device (4a ', 16, 17) rotatably supported by the clutch inner (17) on the other side of the armature rotational shaft (4a') via a bearing (19) on the bracket (10). The pinion shaft 45 has a pinion gear 45a, which transmits the driving force of the electric motors 1 and 7 to mate with the clutch inner 17 installed by penetrating the through hole 17c and extending into the armature rotation shaft 4a '. In the coaxial starter having a), the part supported by the bearing 19 of the clutch inner 17 Larger than the external diameter of the through hole (17c) a pinion gear (45a) and the size of the coaxial type starter, characterized in that provided in the through hole (17c) to said pinion gear (45a) in the.