JPH0554854U - Gearbox - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a transmission that is compact in the axial direction, has a good gear mesh state, and is quiet using a planetary gear mechanism. According to the transmission of the present invention, a planetary gear mechanism having an overhang portion extending to the outer peripheral side of an internal gear is provided on either one of a pinion carrier and a sun gear, and this overhang portion is provided by another member. Between the input side and the output side of the planetary gear mechanism in the gear shifting state, the bearing that is supported between the planetary gear mechanism and the band brake that brakes the rotation of the overhang portion to shift the planetary gear mechanism into the gear shifting state. And a one-way clutch arranged in a direction that allows rotation.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 This invention relates to a transmission used in a vehicle or the like.

[0002]

[Prior Art]

 Japanese Patent Publication No. 58-24605 describes an "engine accessory drive device". This is a device in which the internal gear is connected to the fixed wall (casing) side by an electromagnetic clutch to put the planetary gear mechanism into a shifting state.

[0003]

[Problems to be solved by the device]

 However, in such a configuration using the electromagnetic clutch, the electromagnet and the clutch portion must be arranged between the planetary gear mechanism and the casing, and the axial size becomes larger accordingly. The internal gear, which is the braking member, is cantilevered but does not have a centering function at the free end, and is easily eccentric when receiving an external force from the electromagnetic clutch. Therefore, the meshing state with other gears deteriorates, and vibration, noise, deterioration of gear durability, and damage are likely to occur.

Therefore, an object of the present invention is to provide a transmission mechanism that uses a planetary gear mechanism, is small in the axial direction, and has a good gear meshing state.

[0005]

[Means for Solving the Problems]

 The transmission of this invention is a planetary gear mechanism in which either the pinion carrier or the sun gear is provided with an overhang portion extending to the outer peripheral side of the internal gear, and this overhang portion is provided between other members. Allows rotation in the shifting state between the bearing to be supported, the band brake that brakes the rotation of the overhang part to shift the planetary gear mechanism to the shifting state, and the input side and the output side of the planetary gear mechanism. It is characterized by having a one-way clutch arranged in the direction.

[0006]

[Action]

 When the rotation of the pinion carrier or the sun gear is braked by the band brake, the planetary gear mechanism enters the speed change state and the rotation from the input side is speed-changed and transmitted to the output side. When the band brake is released and the pinion carrier is set to the free rotation state, the rotation on the input side is transmitted to the output side or cut off at a constant speed according to the rotational force transmission direction of the one-way clutch.

Since the overhang portion extending to the outer peripheral side of the internal gear is rotationally braked by the band brake, the function can be arranged in the radial direction and the function can be arranged in the axial direction like the electromagnetic clutch in the conventional example. Since there is nothing, the device can be made compact in the axial direction. In addition, since the pinion carrier or sun gear, which is prone to eccentricity due to the external force from the band brake, is centered through the bearing, the gear meshing state is maintained in good condition, vibration, noise, and gear durability. It prevents deterioration and damage. Furthermore, the operating noise is quiet because the overhang portion blocks noise.

[0008]

【Example】

 One embodiment will be described with reference to FIG. This embodiment is incorporated in a belt drive mechanism (driven pulley) on the accessory side of a belt transmission device that transmits the rotational driving force of an engine to an accessory (alternator, compressor, etc.) in a vehicle. Hereinafter, the left and right directions are the left and right directions in FIG. 1, and members and the like without reference numerals are not shown.

As shown in FIG. 1, the driven pulley 1 includes a pulley 3, an electromagnetic clutch 5 and a transmission 7 of this embodiment.

The pulley 3 has a hollow portion having a U-shaped cross section, and its inner circumference is supported by the bearings 9 and 9 on the outer circumference of the boss portion 13 of the casing 11. The pulley 3 is connected to a belt wheel (drive pulley) on the engine side via a belt mounted in the V groove 15 and is rotationally driven by the driving force of the engine. The casing 11 is fixed to the casing 19 of the auxiliary machine 17 with bolts 21.

An input shaft 23 is stably supported inside the boss portion 13 via bearings 25 and 27 having a wide span, and a flange member 29 is spline-connected to a left end portion of the input shaft 23 and a nut 31. It has been locked in. A ring-shaped armature 33 is arranged on the outer periphery of the flange member 29, and these are connected via a disc spring 37 fixed to each of them by a rivet 35. A ring-shaped electromagnet 39 is arranged in the hollow portion of the pulley 3 and is supported by the casing 11 with a bolt 43 via a support member 41. Thus, the electromagnetic clutch 5 is configured.

When a coil current is passed through the electromagnet 39, the disc spring 37 bends due to its attractive force, the armature 33 is pressed against the pulley 3 and the electromagnetic clutch 5 is connected, and the rotational driving force of the engine is transmitted to the input shaft 23. .. When the coil current is cut off, the armature 33 returns to the left by the biasing force of the disc spring 37, the electromagnetic clutch 5 is released, and the input shaft 23 is separated from the engine.

A hollow output shaft 45 is coaxially arranged to the right of the input shaft 23. A boss 47 is spline-connected to the inner periphery of the output shaft 45, an input shaft 49 of the auxiliary machine 17 is connected to the boss 47 by a half-moon key 51, and a bolt 53 prevents the shaft from coming off. Further, a one-way clutch 55 is arranged between the input shaft 23 and the output shaft 45.

A planetary gear mechanism 57 is arranged on the right side of the electromagnetic clutch 5. This is provided with an internal gear 59 (another member) meshing in order, outer and inner pinion gears 61 and 63, and a sun gear 65. Each of the pinion gears 61 and 63 is supported on a pinion shaft 67 via a bearing 69, and both ends of the pinion shaft 67 are supported by left and right pinion carriers 71 and 73. The internal gear 59 is formed integrally with the right end of the input shaft 23, and the right pinion carrier 73 is supported by the casing 11 via a bearing 75. The sun gear 65 is formed on the output shaft 45. The left end of the output shaft 45 is supported by the input shaft 23 via a bearing 77, and the right end is supported by the pinion carrier 73 via a bearing 79. A bearing 81 is arranged between the left pinion carrier 71 and the input shaft 23 to prevent sliding in the axial direction.

An overhang portion 83 to the outer peripheral side of the internal gear 59 is welded to the pinion carrier 73. A bush 85 (bearing) is arranged between the overhang portion 83 and the internal gear 59. In this way, the free end side (overhang portion 83) of the pinion carrier 73 is supported and centered on the side of the internal gear 59 which is stably supported as described above. Since the sun gear 65 is supported by the stable supported internal gear 59 and the pinion carrier 73, respectively, stable support can also be obtained.

A band 87 of a band brake is arranged on the outer periphery of the overhang portion 83. When the outer periphery of the overhang portion 83 is tightened by this band 87 to lock the rotation of the pinion carriers 71, 73, the planetary gears are rotated. The gear mechanism 57 is in a gear shift state.

Oil is enclosed in the casing 11, and seals 89 and 91 for preventing oil leakage are arranged between the casing 11 and the flange member 29 and the output shaft 45, respectively. Therefore, the bearings in the casing 11 and the meshing parts of the gears are satisfactorily lubricated, and the durability of the transmission is improved.

This oil is also supplied from the oil passage 93 to the bush 85.

Thus, the transmission 7 is configured.

When the rotations of the pinion carriers 71 and 73 are locked by the band brake, the rotation of the engine input to the input shaft 23 (internal gear 59) is accelerated and transmitted to the output shaft 45 (Zan gear 65), and the auxiliary machine 17 To rotate. The one-way clutch 55 is arranged in a direction that allows the rotation at this time. When the band brake is released, the pinion carriers 71 and 73 become free to rotate, and the rotation of the input shaft 23 is transmitted to the output shaft 45 at a constant speed via the one-way clutch 55.

Unlike the conventional example, since the electromagnetic clutch for gear shifting operation is not arranged on the side surface and the braking is performed by the overhang portion 83 on the outer peripheral side of the device, the gear shifting device 7 can be made extremely small in the axial direction. .. Further, as described above, the support of the internal gear 59 and the sun gear 65 including the pinion carriers 71 and 73 which are the braking side members is stable, and the meshing condition of each gear is good. Gear wear is prevented. In this way, the gear noise is low, and the noise transmitted to the casing 11 is reduced due to the blocking effect of the overhang portion 83. Further, the noise blocking effect of the casing 11 surrounding the transmission 7 is added, and the operating noise is quiet. Is.

It should be noted that the overhang portion may be provided in the Zan gear. Further, the overhang portion may be configured to be supported between the casing 11 and another member.

[0023]

[Effect of the device]

 In the transmission of the present invention, an overhang portion to the outer peripheral side of the device is provided in the pinion carrier or sun gear of the planetary gear mechanism, and the overhang portion is supported and centered between other members and the band brake is used. Configured to lock the rotation. Therefore, the device is compact in the axial direction, and the gears are in good mesh with each other, which is quiet.

[Brief description of drawings]

FIG. 1 is a sectional view of a belt wheel mechanism using an embodiment.

[Explanation of symbols]

 7 transmission 11 casing (other member) 23 input shaft (input side) 45 output shaft (output side) 55 one-way clutch 57 planetary gear mechanism 59 internal gear (other member) 65 sun gear 73 pinion carrier 83 overhang portion 85 bush (Bearing) 87 band (Band brake)

Claims (1)

[Scope of utility model registration request] 1. A planetary gear mechanism in which either one of a pinion carrier and a sun gear is provided with an overhang portion extending to the outer peripheral side of the internal gear, and the overhang portion is supported between other members. Bearings, a band brake that brakes the rotation of the overhang part to put the planetary gear mechanism into a shifting state, and a direction that allows rotation in the shifting state between the input side and the output side of the planetary gear mechanism. And a one-way clutch disposed in the transmission.