KR200336755Y1 - Starting device for internal combustion engine - Google Patents

Abstract

The present invention relates to a starter for an internal combustion engine, and more particularly to a structure of a power transmission unit for transmitting the rotational force of the electric motor portion to the ring gear of the engine.

The starting device for an internal combustion engine according to the present invention is configured so that the outer ring of the overrunning clutch is integrally formed with a flange portion to which the planetary gear support pin of the reduction gear is fixed, and the inner ring of the overrunning clutch is integral with the output shaft at one end of the output shaft. The pinion is coupled to the outer surface of the output shaft so as to be able to slide separately. In addition, the tip portion of the main body on which the pinion is supported is provided in a sealed structure, and only the gear portion of the pinion is exposed to the outside of the main body. Therefore, as only the pinion is transported when the pinion is engaged, a large conveying force is not required to transport the pinion, thereby reducing the capacity of the magnetic switch and preventing the inflow of dust or foreign matter into the starter.

Description

Starting device for internal combustion engine

The present invention relates to a starter for an internal combustion engine, and more particularly to a structure of a power transmission unit for transmitting the rotational force of the electric motor portion to the ring gear of the engine.

In general, a starter for an internal combustion engine is a device for supplying energy required for the initial suction and compression stroke of an engine from the outside, and rotates a ring gear of an internal combustion engine flywheel using a rotational force of a DC motor.

This conventional starter, as shown in Figure 1, is provided with an electric motor 1 for generating a rotational force inside the main body 10, the rotary shaft 2 so that the rotational force is transmitted to one side of the motor rotation shaft (2) And an output shaft 3 which is installed on the same axis as the rotary shaft 2.

The outer surface of the output shaft (3) is provided with a pinion (4) which is slid in the lateral direction so that the rotational force transmitted to the axial force axis can be transmitted to the ring gear (200) of the flywheel, and on one side of the pinion, the rotational force when the engine is started An overrunning clutch 5 is provided to prevent reverse transmission of the vehicle.

In addition, a magnetic switch 6 for transferring the overrunning clutch 5 and the pinion 4 to the ring gear 200 of the flywheel is installed at one side of the electric motor 1, and the magnetic switch 6 and the over Between the running clutches 5, a moving lever 7 for transmitting the engagement force of the magnetic switch 6 toward the overrunning clutch 5 is provided.

In addition, a planetary gear reduction device 8 is provided between the rotary shaft 2 and the output shaft 3 to reduce the rotation speed transmitted to the output shaft 3 so that a large rotational force can be transmitted to the output shaft 3. . The planetary gear reduction device 8 is provided with a sun gear 8a formed at the end of the rotation shaft 2 extending from the electric motor 1, and is provided on the outer circumference of the sun gear 8a to mesh with the sun gear 8a to rotate. It consists of a plurality of planetary gears 8b to be formed, and a cylindrical internal gear 8c which is fixed to the outer side of the plurality of planetary gears 8b and is separated from the planetary gears 8b. At the end of the output shaft 3, a disk-shaped flange portion 3a is formed, and a support pin 8d on which the plurality of planetary gears 8b are supported is provided on the flange portion 3a.

The overrunning clutch 5 is composed of an outer ring 5a and an inner ring 5b, and a plurality of clutch rollers 5c are provided between the outer ring and the inner ring. At this time, one side of the outer ring 5a is slidably coupled to the outer surface of the output shaft 3 and rotates together with the output shaft 3, and one side of the inner ring 5b is idle at the outer surface of the output shaft 3 ( It is formed integrally with 4).

In addition, the conventional starter is formed so that the lower side of the front portion of the main body 10 on which the pinion 4 is installed is opened, and the ring gear 200 of the engine is located in the opening so that when the pinion 4 is moved, the ring gear ( 200) so that it can be engaged with.

In the conventional starter configured as described above, when the magnetic switch 6 is operated, the moving lever 7 is rotated so that the overrunning clutch 5 and the pinion 4 are transferred to the ring gear 200 so that the pinion 4 is moved. At the same time as meshing with the ring gear 200, power is applied to the motor 1 to rotate the motor 1.

At this time, when the sun gear 8a at the end of the rotation shaft 2 is rotated, the planetary gear 8b revolves with rotation, and the planetary gear 8b at which the flange portion 3a at the end of the output shaft 3 revolves, It is rotated together so that the output shaft 3 is rotated in a decelerated state. Then, the rotational force transmitted to the output shaft 3 is transmitted to the pinion 4 through the overrunning clutch so that the ring gear 200 of the engine is rotated.

However, such a conventional starter has a structure in which the overrunning clutch 5 and the pinion 4 are conveyed together when the pinion 4 and the ring gear 200 are engaged with each other. This became required. As a result, since the capacity of the magnetic switch 6 must be large in order to smoothly transport the pinion 4 and the overrunning clutch 5, the conventional power transmission configuration is similar to the volume of the magnetic switch 6 that operates it. It became a factor to increase the weight.

In addition, since the starter of the related art has a structure in which the lower side of the front portion of the main body 10 on which the pinion 4 is installed is opened, dust or foreign matter enters the inside of the starter through the opening, and thus the durability of the starter is maintained. And there was a problem that the reliability is lowered.

The present invention is to solve this problem, the purpose of the present invention is to minimize the feed force required for the engagement of the pinion to reduce the capacity of the magnetic switch to configure the overrunning clutch and pinion to be separated from each other It is to provide a starting device for an internal combustion engine that allows only pinions to be conveyed.

Another object of the present invention is to improve the support structure of the pinion and the output shaft to provide a starting device for the internal combustion engine to prevent dust or foreign matter from entering the inside of the starter by sealing the front end of the main body.

1 is a cross-sectional view showing the overall configuration of a conventional starting device.

2 is a cross-sectional view showing the overall configuration of the starting device according to the present invention.

Figure 3 is an exploded perspective view showing the structure of the shaft support portion is supported the pinion and the output shaft according to the present invention.

Explanation of symbols on the main parts of the drawings

30: electric motor part, 31: rotating shaft, 40: power transmission part,

41: output shaft, 42: pinion, 42a: gear portion,

42b: sliding surface, 42c: support groove, 42d: hollow portion,

43: overrunning clutch, 43a: outer ring, 43b: inner ring,

43c: clutch roller, 43d: flange portion, 50: reduction gear,

51: sun gear, 52: planetary gear, 53: internal gear,

54: support pin, 60: magnetic switch, 61: female coil,

62: fixed core, 63: plunger, 70: moving lever,

90: shaft support, 91: support hole, 92: support bearing,

93: sliding member, 100: main body, 200: ring gear.

The present invention for achieving the above object, the rotational force that is transmitted to the output shaft at the same time connecting the output shaft and the output shaft which is installed on the same axis as the rotating shaft of the motor portion, and the rotating shaft of the motor portion A reduction gear composed of a sun gear formed at an end of the rotating shaft, an internal gear installed outside the sun gear, and a plurality of planetary gears disposed therebetween, and a rotational force decelerated by the reduction gear toward the output shaft. An overrunning clutch composed of an inner ring, an outer ring, and a clutch roller therebetween to transmit and prevent reverse transmission of rotational force, and a sliding movement on the outer surface of the output shaft to transmit the rotational force transmitted to the output shaft to the ring gear of the engine. In the starting device for an internal combustion engine having a pinion,

A main body provided with a closed structure in which the pinion is installed so that dust or foreign matter does not enter the starter, and the pinion and the output shaft are supported while the gear part of the pinion is exposed to the outside of the main body. A support hole formed to penetrate the inside and the outside of the front portion of the main body so as to be able to be rotated, a support bearing installed between the support hole and the pinion so that the pinion supported by the support hole can be easily rotated, and the support A cylindrical sliding member installed between the inner ring of the support bearing and the outer surface of the pinion so that the pinion can slide in the axial direction while being supported by the bearing so as to be rotatable, and supported by an inner surface of the sliding member. Of the pinion so that the pinion can slide in the axial direction. It includes a sliding surface formed on the outer surface,

When the pinion is moved in the axial direction, the flange portion of the disk to which the support shaft of the planetary gear is coupled to one side of the outer ring of the overrunning clutch so that the axial movement of the overrunning clutch is prevented to minimize the feed force. It is provided integrally with the outer ring, the inner ring of the overrunning clutch is configured to be integrally provided with one end of the output shaft.

Hereinafter, with reference to the accompanying drawings a preferred embodiment according to the present invention will be described in detail. Figure 2 is a cross-sectional view showing the overall configuration of the starting device according to the present invention, Figure 3 is an exploded perspective view showing the structure of the shaft support that the pinion and the output shaft according to the present invention.

The starter according to the present invention, as shown in this, the motor unit 30 for generating a rotational force in the interior of the main body 100, the rotational force generated from the motor unit 30 to the ring gear 200 of the engine The power transmission unit 40 for transmitting, the magnetic switch 60 to control the power transmission by moving the pinion 42 of the power transmission unit 40, and the magnetic switch 60 so that the pinion 42 is transferred. And a moving lever 70 installed between the power transmission unit 40 and the like.

The motor unit 30 is provided with a rotor 32 and a rotor coil 33 provided on the rotary shaft 31, similar to the configuration of a general electric motor, and a cylindrical stator 34 on the outer side of the rotor 32. Is provided, the commutator 35 and the brush device 36 is installed on one side of the rotor 32 to apply power to the rotor coil 33.

The power transmission unit 40 is provided with an output shaft 41 provided on the side of the rotary shaft 31 to form the same axis as the rotary shaft 31 of the electric motor, the outer surface of the output shaft 41 is transmitted to the output shaft 41 The pinion is installed to slide in the transverse direction to transmit the rotational force to the ring gear 200 of the flywheel. One end of the output shaft 41 is provided with an overrunning clutch 43 that prevents reverse transmission of rotational force when the engine is started. In addition, a planetary gear reduction device 50 is provided between the overrunning clutch and the motor unit 30 to reduce the rotational speed of the motor to generate a large output.

The overrunning clutch 43 is composed of a cylindrical outer ring 43a and an inner ring 43b, and a plurality of clutch rollers 43c are provided between the outer ring and the inner ring for power transmission in only one direction. At this time, the overrunning clutch 43 according to the present invention has a flange portion 43d configured in a disc shape so that the rotational force of the planetary gear reduction device 50 can be transmitted to the overrunning clutch outer ring 43a on one side of the outer ring 43a. ) Is integrally formed. The inner ring 43b of the overrunning clutch 43 is formed to be integrated with one end of the output shaft 41. In other words, one end of the output shaft 41 becomes the inner ring 43b of the overrunning clutch.

The planetary gear reduction device 50 includes a sun gear 51 formed on the outer circumferential surface of the rotary shaft 31 of the electric motor, and a plurality of planetary gears 52 installed on the outer circumference of the sun gear 51 and engaged with the sun gear 51 to rotate. And a cylindrical internal gear 53 which is fixed to the outer side of the plurality of planetary gears 52 and is meshed with the planetary gears 52.

A plurality of support pins 54 are provided on the flange portion 43d formed at one side of the outer ring 43a of the overrunning clutch 43, and the support pins 54 are planetary gears of the reduction device 50. 52 is inserted and supported. Therefore, when the sun gear 51 of the rotary shaft 31 is rotated, the planetary gear 52 is revolving and rotating, the revolving of the planetary gear 52 through the support pin 54 of the flange portion of the overrunning clutch By rotating 43d, the rotational force of the rotary shaft 31 can be transmitted to the outer ring 43a of the overrunning clutch.

The pinion 42 is coupled to the outer surface of the output shaft 41 in a splined tooth shape so as to transmit the rotational force of the output shaft 41 to the ring gear 200 of the engine and to slide in the lateral direction.

At this time, the starter according to the present invention is provided with a closed structure of the front portion of the main body 100 to prevent the inflow of dust or foreign matter toward the front portion of the main body 100, the pinion 42 is supported, The front portion is provided with a shaft support 90 so as to support the pinion 42 and the output shaft 41.

In the shaft support portion 90, the pinion 42 extends to the outside of the main body 100 so that the pinion 42 can be engaged with the ring gear 200 of the engine so that the inside and the outside of the main body 100 pass through the support hole ( 91 is provided, and the support hole 91 is provided with a support bearing 92 so that the pinion 42 can be rotatably supported. In addition, between the inner ring of the support bearing 92 and the outer surface of the pinion 42, the pinion 42 can be slid in the axial direction in a state in which the pinion 42 is rotatably supported by the support bearing 92. A sliding member 93 is provided.

The pinion 42 supported by the shaft support 90 has a gear part 42a engaged with the ring gear 200 of the engine on one end of the pinion 42, and a moving lever for moving the pinion on the other end of the pinion 42. A support groove 42c is formed along the outer surface such that one end of the 70 is caught. And the outer surface between the support groove 42c and the gear portion 42a is provided with a sliding surface 42b having a smooth outer surface so that the pinion is supported by the inner surface of the sliding member 93 and can be slid in the axial direction. do.

And the hollow part 42d in which the said output shaft 41 is inserted and supported is formed in the center part of the pinion 42, and this hollow part has the output shaft 41 in the pinion 42 which slides in an axial direction as mentioned above. The spline teeth are formed so that the rotational force of) can be transmitted.

That is, in the starter according to the present invention, the outer surface of the pinion 42 is supported by the sliding member 93 of the shaft support part 90, and the output shaft 41 is supported by the hollow part 42d of the pinion again. ) And pinion 42 can be rotatably supported.

In addition, the magnetic switch 60, which moves the pinion 42 to engage with the ring gear 200, is provided with the excitation coil 61 wound on the bobbin and a fixed iron core which is installed inside one side of the excitation coil 61 ( 62, a plunger 63 made of a movable iron core corresponding to the fixed iron core 62, and a restoring spring 64 provided between the plunger 63 and the fixed iron core 62, and the like. Therefore, when the magnetic coil 60 is magnetized, the magnetic switch 60 causes the plunger 63 to linearly move due to the attraction force generated between the fixed iron core 62 and the plunger 63.

In addition, one end of the movable lever 70 is coupled to the hook 65 installed at the center of the plunger 63, and the other end is coupled to the support groove 42a of the pinion 42 described above, and a central portion between both ends thereof. Is supported by the support parts 80 and 81 formed inside the main body 100. Therefore, when the plunger 63 of the magnetic switch is operated, the movable lever 70 is rotated about the supports 80 and 81 to move the pinion 42 in the axial direction.

The following describes the overall operation of the starter for the internal combustion engine according to the present invention configured as described above.

When power is applied to the excitation coil 61 of the magnetic switch 60, an attractive force is generated between the fixed iron core 62 and the plunger 63, and the plunger 63 moves toward the fixed iron core 62 by this attractive force. do. When the plunger 63 is moved, the moving lever 70 interlocked with the plunger 63 rotates to move the pinion 42 in the axial direction to engage the pinion 42 with the ring gear 200.

At this time, the overrunning clutch 43 is not moved, and the pinion 42 is moved in the outward direction of the main body 100 while the sliding surface 42b slides on the inner surface of the sliding member 93.

In addition, when the plunger 63 is moved toward the stationary iron core 62, the contact 68 provided at the rear of the stationary iron core 62 is connected, and a large current is applied to the motor unit 30 to supply the electric motor 30. Will be rotated. At this time, when the sun gear 51 of the rotary shaft 31 is rotated, the planetary gear 52 rotates and rotates, and the flange portion 43d on one side of the overrunning clutch rotates due to the revolution of the planetary gear 52. Will be. That is, the outer ring 43a of the overrunning clutch 43 is rotated.

The rotational force transmitted to the outer ring 43a of the overrunning clutch is transmitted to the overrunning clutch inner ring 43b provided integrally with one end of the output shaft 41 via the clutch roller 43c to rotate the output shaft 41. When the output shaft 41 is rotated, the pinion 42 coupled to the outer surface of the output shaft is rotated to rotate the ring gear 200 of the engine. At this time, the inner shaft of the output shaft 41, the pinion 42, the sliding member 93, and the support bearing 92 supported by the shaft support 90 is rotated together.

As described in detail above, the starter according to the present invention is the overrunning clutch does not move during engagement of the pinion and the ring gear, and as only the pinion which is slid on the outer surface of the output shaft is transferred, a large feed No power is required. Therefore, the capacity of the magnetic switch can be reduced, there is an advantage that can reduce the volume and weight of the magnetic switch. In addition, the tip portion of the main body on which the pinion is supported is provided in a sealed structure, and only the gear portion of the pinion is provided in a structure that is exposed to the outside of the main body, thereby preventing the inflow of dust or foreign matter into the starter device. It has the advantage of increasing durability and reliability.

Claims (1)

The motor 30 to generate rotational force, the output shaft 41 provided on the same axis as the rotation shaft 31 of the motor unit, and the output shaft and the rotation shaft are connected to each other to reduce the number of revolutions transmitted to the output shaft. A reduction gear 50 composed of a sun gear 51 formed at an end of the rotation shaft, an internal gear 53 provided outside the sun gear, and a plurality of planetary gears 52 disposed therebetween, An overrunning clutch 43 composed of an inner ring 43b and an outer ring 43a and a clutch roller 43c therebetween to transmit the decelerated rotational force to the output shaft 41 and to prevent reverse transmission of the rotational force; In the starter device for an internal combustion engine comprising a pinion (42) which is slidably installed on the outer surface of the output shaft to transmit the rotational force transmitted to the output shaft to the ring gear 200 of the engine, In order to prevent dust or foreign matter from entering the inside of the starting device, the main body 100 in which the pinion 42 is installed is provided in a sealed structure, and the gear portion 42a of the pinion may be exposed to the outside of the main body. At the same time, the support hole 91 is formed to penetrate the inside and the outside of the main body so that the pinion and the output shaft can be supported, and the pinion supported by the support hole can be easily rotated. Between the support bearing 92 installed between the support hole and the pinion, and between the inner ring of the support bearing and the outer surface of the pinion so that the pinion can slide in the axial direction while being rotatably supported by the support bearing. Cylindrical sliding member 93 is installed in the state, and the pinion can slide in the axial direction while being supported on the inner surface of the sliding member. The lock comprises a sliding surface (42b) formed on an outer surface of the pinion, Support of the planetary gear 52 on one side of the outer ring 43a of the overrunning clutch 43 so that the axial movement of the overrunning clutch 43 can be prevented when the pinion 42 is moved in the axial direction. A disk-shaped flange portion 43d to which the shaft 54 is coupled is provided integrally with the outer ring 43a, and the inner ring 43b of the overrunning clutch 43 is integral with one end of the output shaft 41. Starting device for an internal combustion engine, characterized in that provided.