JPH0542797U - Gearbox - Google Patents

Abstract

(57) [Abstract] [Purpose] The internal gear of the planetary gear mechanism is rotationally braked to change gears, the rotation members are supported reliably, and each part can be sufficiently lubricated. It is intended to provide a simple transmission. The transmission of the present invention is a planetary gear mechanism in which one of a pinion carrier and a sun gear is on the input shaft side and the other is on the output shaft side, and an internal gear is in a floating state by meshing with a pinion gear, and a planetary gear mechanism for accommodating the planetary gear mechanism. In addition, a casing that supports the pinion carrier via bearings on both sides in the axial direction of the pinion gear, a band brake that rotationally brakes this on the outer peripheral side of the internal gear to put the planetary gear mechanism into a shifting state, the input shaft and the output shaft. And a one-way clutch which is arranged between and to allow rotation during gear shifting.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

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

[0002]

[Prior Art]

 Japanese Patent Publication No. 58-24605, "Engine accessory drive device" is described. This is a device in which the internal gear of the planetary gear mechanism is continuously rotationally driven to the fixed wall side by an electromagnetic clutch to bring the gear into a shifting state.

[0003]

[Problems to be solved by the device]

 In such a configuration in which the rotating member is braked by the electromagnetic clutch, the electromagnetic clutch must be arranged between the planetary gear mechanism and the fixed wall, and the fixed wall is attached to the planetary gear mechanism side due to the space limitation of the electromagnetic clutch. Difficult to extend. Therefore, in this conventional device, the internal gear and the sun gear are supported not by the fixed wall but by the bearing on the rotating shaft. Moreover, each of these bearings is a cantilevered support bearing on one axial side of the planetary gear mechanism. In this way, since the support of the rotating member is uncertain, vibration, noise, and reduction of bearing and gear resistance occur.

Further, since the oil seal is arranged between the rotating members with uncertain support in this way, oil leakage is likely to occur and the lubrication of the bearings and gears is likely to be insufficient. Moreover, since there is no casing that houses the entire transmission, lubrication by oil filling is also not possible.

Further, in order to compensate for the instability of the cantilever support as described above, two bearings each are used with a space between each other. This and the fact that the electromagnetic clutch is arranged in the axial direction of the planetary gear mechanism make it large in the axial direction, which is a disadvantage in terms of arrangement space.

In view of this, the present invention is a speed change device that rotationally brakes an internal gear of a planetary gear mechanism to perform a speed change, in which a rotating member is reliably supported and each part can be sufficiently lubricated. An object of the present invention is to provide a transmission that can be made small in the axial direction.

[0007]

[Means for Solving the Problems]

 The transmission of the present invention accommodates a planetary gear mechanism in which one of the pinion carrier and the sun gear is the input shaft side and the other is the output shaft side, and the internal gear is in a floating state by meshing with the pinion gear, and the planetary gear mechanism. At the same time, a casing that supports the pinion carrier via bearings on both sides in the axial direction of the pinion gear, a band brake that rotationally brakes this on the outer peripheral side of the internal gear and puts the planetary gear mechanism into the shifting state, the input shaft and the output shaft. It is characterized by having a one-way clutch which is arranged between the two and allows rotation during shifting.

[0008]

[Action]

 When the internal gear is rotationally braked with a band brake, the planetary gear mechanism is put in a speed change state and the rotation from the input shaft is speed-changed and transmitted to the output shaft. When the band brake is released and the internal gear is set to the free rotation state, the rotation of the input shaft is transmitted to the output shaft or cut off at a constant speed according to the rotation transmission direction of the one-way clutch.

Unlike the conventional example, the extension of the casing is not restricted by the electromagnetic clutch, because the rotation braking of the internal gear is performed by the band brake on the outer peripheral side, and the casing is housed in the planetary gear mechanism. At the same time, the pinion carrier can be configured to be supported on both axial sides of the pinion gear. The sun gear can also be supported reliably by supporting the pinion carrier or the casing that is thus securely supported, so that vibration, noise, and reduction of the life of bearings and gears can be prevented. Further, since the internal gear is in a floating state due to the meshing with the pinion gear, the tooth contact of the meshing is good, the durability of the internal gear and the pinion gear is improved, and the noise is reduced.

It is possible to prevent oil leakage by enclosing oil in the casing and disposing an oil seal between the rotating members for reliable support or between the casings, and to sufficiently lubricate each part.

Since the rotating member can be supported on both sides, unlike the conventional example, it is not necessary to dispose two bearings with a large gap between them. Due to this and the use of the band brakes arranged in the outer peripheral direction, the device can be greatly downsized in the axial direction. This margin allows the bearing span to be expanded to ensure reliable support.

[0012]

【Example】

 One embodiment will be described with reference to FIGS. 1 and 2. This embodiment is used in an auxiliary belt device (driven pulley) on the accessory side of a belt transmission mechanism that transmits the rotational driving force of an engine to an accessory (compressor) in a vehicle. FIG. 1 shows the entire apparatus and auxiliary equipment, and FIG. 2 shows an enlarged view of the driven pulley. Hereinafter, the left and right directions are the left and right directions in FIG. 1 and FIG. 2, and members and the like without reference numerals are not shown.

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

The pulley 3 has a U-shaped cross section, and its inner periphery is supported by the outer periphery of the left end side boss portion 13 of the casing 11 via bearings 9, 9. The pulley 3 is connected to a belt pulley device (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.

A hollow input shaft 23 is supported inside the boss portion 13 via a bearing 25, and a flange 27 is fixed to the left end portion thereof with a bolt 29. A ring-shaped armature 31 is arranged on the outer peripheral side of the flange 27, and these are connected by a leaf spring 35 fixed to each by a rivet 33. A ring-shaped electromagnet 37 is arranged in the hollow portion of the pulley 3 and is supported by the casing 11 by a bolt 39 via a support member 41. Thus, the electromagnetic clutch 5 is configured.

When a coil current is applied to the electromagnet 37, the leaf spring 35 is bent by the attractive force, the armature 31 is attracted to the pulley 3, the electromagnetic clutch 5 is connected, and the rotational driving force of the engine is transmitted through the electromagnetic clutch 5. It is transmitted to the input shaft 23. When the coil current is cut off, the armature 31 returns to the left by the urging force of the leaf spring 35, the electromagnetic clutch 5 is opened, 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, and the output shaft 45 is connected to an input shaft 53 of an auxiliary machine by a bolt 47, a washer 49, and a key 51. .. Further, between the input shaft 23 and the output shaft 45, a one-way clutch 61 in which a roller 59 is arranged between an inner race 55 and an outer race 57 formed respectively, is provided.

A planetary gear mechanism 63 is arranged on the right side of the electromagnetic clutch 5. The planetary gear mechanism 63 includes an internal gear 65 meshed in order, the outer and inner pinion gears 67 and 69, and a sun gear 71. The pinion gears 67, 69 are supported on the respective pinion shafts 73, 75 via bearings 77, and the pinion shafts 73, 75 are supported at both ends by the left and right pinion carriers 79, 81.

The left pinion carrier 79 is formed integrally with the input shaft 23, and the right pinion carrier 81 is supported by the casing 11 via a bearing 83. The sun gear 71 is formed on the output shaft 45, and the right end portion of the output shaft 45 is supported by the right pinion carrier 81 via a bearing 85. The internal gear 65 is in a floating state by meshing with the outer pinion gear 67, and its axial direction is supported by the left and right thrust bearings 87, 89 arranged between it and the casing 11.

A band 91 of a band brake is arranged on the outer periphery of the internal gear 65 to brake the rotation of the internal gear 65. Lubricating oil is sealed in the casing 11, a seal 93 is arranged between the input shaft 23 and the hub 13, and a seal 93 is arranged between the left end portion of the output shaft 45 and the input shaft 23 and between the right end portion and the casing 11. Seals 95 and 97 are arranged between them.

When the rotation of the internal gear 65 is braked by the band brake, the rotation of the engine input to the input shaft 23 (pinion carrier 79) is accelerated and transmitted to the output shaft 45 (sun gear 71). The auxiliary machine 17 is rotationally driven. The one-way clutch 61 is arranged so as to allow this rotation. When the banto brake is released, the internal gear 65 becomes free and the rotation of the input shaft 23 is transmitted to the output shaft 45 at a constant speed via the one-way clutch 61.

As described above, the bearings of the left and right pinion carriers 79 and 81 are supported on the casing 11 by the bearings 25 and 83. In addition to this, the spans of the bearings 25 and 83 are widened. Solid support. Further, the sun gear 71 is supported by the right pinion carrier 81, which is securely supported in this way, via a bearing 85. Therefore, vibration and noise accompanying the rotation of the pinion carriers 79 and 81 and the sun gear 71 are extremely small, and the durability of these bearings 25, 83 and 85 and the bearing 77 of the pinion gears 67 and 69 is improved.

Since the internal gear 65 meshes with the pinion gear 67 in a floating state, there is no difficulty in tooth contact, durability of each gear is improved, and vibration and noise are small. Further, since the sun gear 71 is supported on the pinion carrier 81, the meshing state with the pinion gear 69 is good, the durability of each gear is further improved, and vibration and noise are small.

Further, since the casing 11 is filled with oil and the seals 93, 95, 97 are arranged at the above-mentioned reliable support locations, oil leakage is unlikely to occur, and the lubrication of each part in the casing 11 is prevented. Can be performed sufficiently. Also, unlike the conventional example, the internal gear 65 is braked at its outer circumference, and since it is not necessary to support the rotating member in a cantilever manner, it is not necessary to use two bearings in one place, so the device is compact in the axial direction. Is. The sun gear 71 may be used as the input side and the pinion carriers 79, 81 may be used as the output side.

[0025]

[Effect of the device]

 The transmission of the present invention is a transmission in which the internal gear of the planetary gear mechanism is rotationally braked to change the speed.In the transmission, the internal gear is configured to be braked by a band break on the outer periphery thereof, and the pinion carrier of the pinion gear is The internal gear was floated by being supported by the casing on both sides in the axial direction. Therefore, since the rotation member is reliably supported and the gear meshes well, the vibration and noise are extremely small, and the durability of the bearing and the gear is improved. In addition, oil does not leak from the seals and lubrication of each part is sufficient, and the size is small in the axial direction.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a belt wheel device and an accessory according to one embodiment.

FIG. 2 is an enlarged sectional view of a belt wheel device portion of FIG.

[Explanation of symbols]

 7 Gearbox 11 Casing 23 Input shaft 25,83 Bearing 45 Output shaft 61 One-way clutch 63 Planetary gear mechanism 65 Internal gear 67,69 Pinion gear 71 Sun gear 79,81 Pinion carrier 91 Band (band brake)

Claims (1)

[Scope of utility model registration request] 1. A planetary gear mechanism in which one of a pinion carrier and a sun gear is on the input shaft side and the other is on the output shaft side, and an internal gear is in a floating state by meshing with the pinion gear; Located between the input shaft and the output shaft, a casing that supports both sides of the pinion gear in the axial direction via bearings, a band brake that rotationally brakes this on the outer peripheral side of the internal gear to shift the planetary gear mechanism to a shifting state. A transmission, comprising: a one-way clutch that allows rotation during shifting.