JPH01104966A - Buffer device for starter - Google Patents

Abstract

PURPOSE:To obtain the lightweight starter with the compact constitution by arranging a shock softening part which is interposed between the internal gears of a planetary gear mechanism and softens a revolution load which is in the reverse direction to the engine start direction and applied onto an internal gear, in the axis core direction of the internal gear. CONSTITUTION:When an engine starts, if a cranking load is applied from the engine side, an internal gear 11 elastically turns against the urging force of a buffer device 14, in a planetary gear mechanism 7, and the impact is softened. Through the impact due to the cracking load is absorbed by the elastic turning of the internal gear 11 against the buffer device 14, the shock softening part including the buffer device 14 is formed in the arrangement constitution arranged on the axis core direction side without forming said shock softening part on the outer diameter side of the internal gear 11 as in the prior art. Therefore, the need of a large-sized case body 1 is avoided, and a lightweight starter can be obtained with the compact constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shock absorber in a starter installed in a vehicle such as a passenger car, motorcycle, bus, or truck.

[Prior art and problems to be solved by the invention] Generally, some starters of this type are designed to transmit the driving force from the motor to the output rotating shaft in a decelerating manner via a planetary gear mechanism. be.

By the way, when starting the engine, a so-called cranking load that accompanies torque fluctuations during cranking on the engine side applies an impulsive load in the opposite direction to the engine starting direction. As shown in Japanese Patent No. 59-97262, there is a structure in which the internal gear of a planetary gear mechanism is elastically rotated so as to buffer the cranking load. Since it is installed on the radial side, the diameter of the starter inevitably has to be large, and since the internal gear cannot receive direct support from the case body, the entire wall is made thicker to prevent deflection. It has disadvantages such as the need to measure

[Means for solving the problem] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a shock absorbing device for a starter that can eliminate these drawbacks. In a starter that transmits power from the casing to the output rotating shaft via a planetary gear mechanism, there is a bracket that is supported in a non-rotating manner on the case body side, and an internal tooth of the planetary gear mechanism that is installed inside the case body so as to be rotatable around the axis. A shock absorber is provided in parallel with the internal gear in the axial direction, and is interposed between the internal gear and absorbs the rotational load in the direction opposite to the engine starting direction that the internal gear receives. It is.

Further, in the starter, the bracket supported on the case body side in a non-rotating manner includes a first leg piece whose outer circumferential surface is supported on the inner circumferential surface of the case body, and a first leg piece facing at a predetermined distance;
A second locking piece is provided protruding in the axial direction so that the leg piece is longer than the second locking piece, and the outer periphery of the internal gear of the planetary gear mechanism is rotated around the axis at a portion of the leg piece that is longer than the locking piece. In addition to rotatably fitting into the internal gear, the outer circumferential surface of the internal gear slides into contact with the inner circumferential surface of the case.
The first and second rib portions protrude toward one side of the axial locking side, and the first locking piece loosely fits between the two rib portions to limit the rotation range of the internal gear. The one rib part is provided to face the second locking piece with a gap therebetween, and the shock absorber receives a rotational load in a direction opposite to the engine starting direction between the first rib part and the second locking piece. It is preferable to intervene.

Further, in the starter, a buffer member receiving a rotational load in the engine starting direction may be interposed between the first rib portion and the first locking piece facing each other.

With this configuration, the present invention is able to buffer the cranking load by the elastic rotation of the internal gear, but it also prevents the internal gear from being bent by the case body, and has a large diameter. This is to ensure that this can be avoided.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a case body of the motor, and the tip of an output rotating shaft 2 is rotatably supported on the case body 1, and a one-way clutch is arranged in the middle of the output rotating shaft 2. 3 is configured to be movable in the axial direction by members such as a clutch inner 3a in which a pinion gear 4 is integrally formed, a roller 3b, and a clutch outer 30 spline-fitted to the output rotating shaft 2. On the other hand, 6 is a motor, and the motor shaft 6a of the motor 6 is connected to the output rotation shaft 2.
As will be described later, they are coaxially connected via a planetary gear mechanism 7 in a decelerating manner. Reference numeral 8 designates a shift lever, and the shift lever 8 swings about a fulcrum 8a when a magnetic switch 9 is activated when a starter switch (not shown) is opened, thereby moving the one-way clutch 3 in the direction of the arrow. The pinion gear 4 is brought into mesh with the ring gear 5 on the engine side.

The base end of the output rotating shaft 2 is rotatably supported on the tip of the motor shaft 6a, and a support shaft 2b is attached to the flange 2a formed at the base end of the output rotating shaft 2. It is integrally provided in a protruding manner, and a planetary gear 10 is rotatably supported thereon. This planetary gear 10 is meshed between an output gear port b formed on the motor shaft 6a and an internal gear 11 provided with an internal tooth body 11a provided on the case body 1 side as described later. 10 receives rotation from the motor shaft 6a side and revolves in the direction of arrow B while rotating □, so that power is transmitted from the motor 6 side to the output rotating shaft 2 while being decelerated. .

Reference numeral 12 denotes a bracket which freely rotatably supports the output rotating shaft 2 with a boss portion 12a, and the bracket 12 has a stopper 12b protruding from the outer peripheral edge toward the one-way clutch side in the axial direction. By fitting into and engaging with a concave groove 1a formed on the inner circumferential portion of 1, it can be assembled in a rotation-preventing supported state in which rotation around the axis is restricted. Further, the outer peripheral edge of this bracket 12 is supported in surface contact with the inner peripheral surface of the case body 1, and the planetary gear mechanism 7
Leg pieces 12c (in the form of arcuate plates facing in the circumferential direction) are spaced at a predetermined distance in the axial direction so as to abut against the bracket 13 integrally assembled on the motor yoke 6C side. A plurality of brackets (four in this embodiment) are provided protrudingly, and a notch 12d into which the shift lever 8 fits is formed on the outer circumference of the bracket 12.
The leg piece 12c protrudes in the same direction as the leg piece 12e.
A pair of shorter first and second locking pieces 12e and 12f are provided in a protruding manner symmetrically.

On the other hand, the above-mentioned internal gear 11 is configured such that its outer peripheral surface is in sliding contact with the inner periphery of the leg piece 12C so as to be rotatable around the axis. first and second rib portions 11b having a large diameter so as to be in sliding contact with the circumference;
The first and second rib portions 11b and llc are both provided to protrude toward the bracket 12 in the axial direction. The inward gear 11 has the first and second rib portions 1
1b and llc, the first locking piece 12e loosely fits between the first locking piece 12e and the first rib portion 1.
1b or the range in which the second rib portion lIC contacts.

Further, the second rib portion tib and the second locking piece 12f are opposed to each other with a predetermined distance therebetween, and the buffer bullet 14 is interposed between the opposed parts, and the internal gear 11 is connected to the first rib part 12f. The portion 11b is biased toward the side where it comes into contact with the first locking piece 12e, in the driving direction of the motor 6 (direction of arrow B). When starting the engine, when a rotational load in the opposite direction is applied from the output rotating shaft 2 side due to torque fluctuations during cranking,
The internal gear 11 is.

against the biasing force of the buffer bomb 14 in the opposite direction of arrow B,
The second rib portion 11c rotates elastically to the maximum extent until it comes into contact with the first locking piece 12e, thereby cushioning the impact during cranking. Department will be formed.

In the embodiment of the present invention configured as described above, when the engine switch is turned ON, the starter motor 6 is driven and the magnetic switch 9 is activated, causing the ring gear 5 and pinion gear 4 to mesh, thereby starting the engine. At this time, in the planetary gear mechanism 7, the first rib portion 11b of the internal gear 11 is connected to the first locking piece 12e of the bracket 12.
The planetary gear 10 revolves around the output gear port b while rotating in the direction of the arrow B, and decelerated power is transmitted to the output rotating shaft 2 side. When a cranking load is applied to the planetary gear mechanism 7, the internal gear 11 of the planetary gear mechanism 7 elastically rotates in the opposite direction of arrow B against the biasing force of the buffer bomber 14, thereby buffering the impact. That will happen.

As described above, in the present invention, the internal gear 11 is elastically rotated against the buffer bullet 14 to absorb the impact caused by the cranking load. Since the shock absorbing portions are not formed on the outer diameter side of the internal gear 11 as in the conventional case, but are arranged side by side in the axial direction, it is not necessary to make the case body 1 large in diameter. do not have. Moreover, in addition to being supported by the leg piece 12e, the internal gear 11 is supported by first and second rib portions 11b and lie, which serve as bullet holders and limit members for the rotation range. Since the diameter is larger than that of the case body 1 and it is directly supported from the case body 1 side, the internal gear 11 is reliably prevented from deflecting and is reinforced. This means that it is possible to promote the thinning of the 11, which contributes to making the starter lighter and more compact. Furthermore, when the internal gear 11 is subjected to a cranking load, the second rib portion lie comes into contact with the first locking piece 12e and further rotation of the internal gear 11 is restricted, so the shock absorber It is possible to avoid unnecessarily deforming the machine 14, and effective protection can be achieved.

In addition, this device has a configuration in which the leg piece 12c of the bracket 12 comes into contact with the bracket 13 on the opposite side to ensure play in the axial direction of the planetary gear 10, so the structure can be simplified. It will be possible.

In addition, the present invention is of course not limited to the above-mentioned embodiments, and the point is that the internal gear 11 is provided with an impact buffer that buffers the rotational load in the direction opposite to the engine starting direction. Any device may be used as long as it is arranged in parallel with the gear 11 in the axial direction, so for example, as shown in FIG. The rubber elastic body 20 may provide cushioning. In this case, since the rubber elastic body 20 receives a shearing force and buffers it, it is desirable to provide a means for preventing the rubber elastic body 20 from falling off, such as the locking protrusion 12g. In addition, as shown in FIGS. 9 and 10, the first rib portion 11
If the structure is such that the muffler 21 or the muffler 22 that receives rotational load in the engine starting direction is interposed between the facing portions of b and the first locking piece 12e, the rotational load in the direction of the second locking piece 12f in the direction of the second locking piece 12f in response to the cranking load. When the first rib portion 11b that has been displaced is returned to the direction of the first locking piece 12e, it is possible to prevent the generation of a tapping sound due to contact with the first locking piece 12e, thereby making the starter quiet. performance can be further improved.

[Operations and Effects] In summary, since the present invention is constructed as described above, when the engine receives a load due to torque fluctuations during cranking on the engine side when starting the engine, the internal gear is Although the shock absorber is elastically rotated against the internal gear to absorb the impact, the shock absorber is arranged parallel to the internal gear in the axial direction. This may be due to the fact that the starter is not made to have a large diameter unlike conventional ones, which are provided on the outside diameter side of the internal tooth gear, and this greatly contributes to making the starter lighter and more compact. Since it is also possible to directly support the gear, it is possible to reliably prevent the internal gear from bending.

Further, in the second claim, the internal gear rotatably fitted into the leg of the bracket has a large diameter rib portion and is supported directly on the inner circumferential surface of the case. The shock absorber is reinforced and prevented from deflecting, and by limiting the rotation range of the internal gear, the shock absorber can be effectively protected, providing a highly reliable shock absorbing effect over a long period of time. This results in a quiet, high-performance starter.

Further, as in the third aspect, if a buffer member is interposed between the first rib portion and the first locking piece facing each other, when the first rib portion is displaced due to cranking load and is displaced back, It is possible to reliably prevent the occurrence of hitting noise due to the contact between the first rib portion and the first locking piece, and further improve the quietness of the starter.

[Brief explanation of the drawing]

The drawings show an embodiment of the shock absorbing device in the starter according to the present invention, in which Fig. 1 is a partially cutaway front view of the starter, and Fig. 2 X and Y are cross-sectional front views and side views of the case body. Figures x, y, and z in Figure 3 are the front view, rear view, and vertical sectional view of the internal gear, and Figure 4 is X. Y and Z are a front view, a back view, and a vertical cross-sectional view of the bracket. Fig. 5 is a side view showing the state in which the internal gear is assembled into the bracket, Fig. 6 is an explanatory diagram showing the relationship between the internal gear and the bracket during normal operation, and Fig. 7 is a diagram showing the relationship between the internal gear and the bracket under cranking load. Fig. 8 is an enlarged sectional view of the main part showing the second embodiment; Fig. 9 is a front view of the main part showing the third embodiment; Fig. 1O FIG. 3 is a front view of main parts showing a fourth embodiment. In the figure, 1 is a case body, 2 is an output rotating shaft, 7 is a planetary gear mechanism, 10 is a planetary gear, 11 is an internal gear, 12 is a bracket, Ilb, Llc are ribs, 12c is a leg piece, 1
2e and 12f are locking pieces. Patent application: Honda Motor Co., Ltd.
Mitsuba Electric Manufacturing Co., Ltd. Figure 3 X Z Y Figure 5 2c Figure 6 1Fr Figure 7 12゜1・

Claims (1)

[Scope of Claims] 1) In a starter that transmits power from a motor to an output rotating shaft side via a planetary gear mechanism, there is provided a bracket that is non-rotatably supported on the case body side, and a bracket that is rotatably supported around the axis within the case body. The impact buffer is interposed between the internal gear of the planetary gear mechanism and absorbs the rotational load that the internal gear receives in the direction opposite to the engine starting direction. A buffer device in a starter characterized by being arranged in parallel. 2) In the starter, the bracket supported on the case body side in a non-rotating manner has a leg piece whose outer circumferential surface is supported on the inner circumferential surface of the case body, and first and second locks facing each other with a predetermined interval. The legs protrude in the axial direction so that the leg pieces are longer than the locking pieces, and the outer periphery of the internal gear of the planetary gear mechanism is attached to a part of the leg piece that is longer than the locking piece so that it can rotate freely around the axis. At the same time, the internal gear is fitted with first and second rib portions whose outer circumferential surface slides on the internal circumferential surface of the case and protrudes toward one side of the axial direction. A first locking piece is loosely fitted between both rib parts to limit 2. The shock absorbing device for a starter according to claim 1, further comprising a shock absorbing device which receives a rotational load in a direction opposite to the engine starting direction, and is interposed between the shock absorbing device and the shock absorbing device. 3) The buffer device in the starter according to claim 2, wherein in the starter, a buffer member that receives rotational load in the engine starting direction is interposed between the opposing first rib portion and the first locking piece. .