JPH0979327A - Transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission having input and output shafts which are aligned on one and the same line, and having a planetary gear mechanism as a speed change mechanism so as to be compact and increase the speed change ratio suitable for large power transmission, and carry out a multi-stage speed change. SOLUTION: A plurality of planetary gear mechanisms A, B, C incorporating an outer ring gears 2, planetary gears 3, 4, 5, and inner ring gears 6, 7, 8 which are combined together, are arranged on one and the same line in multi-stages. A gear shaft 15 of each of planetary gears are journalled at opposite ends to bearing discs 11, 12, 13, 14, and a piston 19 in a braking device 17 arranged at the outer periphery of the casing, is made into press-contact with a desired outer ring gear 2 so as to be held stationarily. Thereby it is possible to change the speed in multi-stages between the input and output shafts.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission having coaxial input and output shafts and a planetary gear mechanism interposed between the shafts. The transmission is characterized in that the rotation transmission of the planetary gear mechanism provided coaxially in multiple stages with different speed ratios can be taken out. 2. Description of the Related Art A planetary gear mechanism that can obtain a larger speed ratio than other gear transmissions usually uses a large-diameter outer ring gear, a planetary gear, and an internal gear as a set, and therefore has a constant speed. I can only get gear changes. Therefore, it has not been conventionally used as a mechanism capable of shifting in multiple stages. When one multi-stage transmission is constructed by the gear transmission mechanism, the size of the machine body is increased and the weight is increased. On the other hand, although the planetary gear mechanism that can obtain a large gear ratio on the same shaft is compact, it has a drawback that multi-speed gear shifting is not possible. Therefore, it has been a subject to obtain a mechanism that can take advantage of the planetary gear mechanism and can shift in multiple stages without impairing compactness. SUMMARY OF THE INVENTION Therefore, according to the present invention, a plurality of outer ring gears having an inner diameter and an outer diameter are arranged on the same axis line along an outer peripheral surface of an inner peripheral surface of a cylindrical casing. Each outer ring gear is rotatably equipped with planetary gears and internal gears of different diameters meshed with each other, and multiple sets of planetary gear mechanisms with different rotation transmission ratios are provided in multiple stages on the same axis, and one axis The rotary shaft inserted into the internal gear and the above internal gears are integrally connected, and the rotary shafts are rotatably fitted to the rotary shaft, and a plurality of bearing discs are arranged so as to be located on both sides of each internal gear. Then, by fitting both ends of the gear shafts of the planetary gears to the bearing discs and bearing the both ends, the bearing discs located on both sides of the internal gear are connected so as to rotate integrally, and The other rotating shaft is attached to the shaft center of the bearing disk located outside. While connected, a planetary gear mechanism having a desired rotation transmission ratio is provided on the outer circumference of the casing with a braking device having pistons that come into contact with and separate from the outer circumferential surface of the outer ring gear at each stage at a plurality of positions in the circumferential direction. By bringing the piston of the braking device into pressure contact with the outer ring gear of, and stopping the outer ring gear,
(EN) Provided is a transmission adapted to generate a predetermined gear shift between one rotary shaft and the other rotary shaft. The respective bearing discs rotatably arranged on both sides of the internal gears of each stage form one rotating body by bearing the shafts of the planetary gears of both stages at both ends. Then, among the outer ring gears of each stage, the outer ring gear of the planetary gear mechanism having a desired speed ratio is actuated by the braking device, and the piston is brought into pressure contact with the outer periphery of the outer ring gear, thereby making it stationary.
The speed ratio of the selected planetary gear mechanism is transmitted to the other rotating shaft by the integral rotation of each bearing disc. Further, in this transmission, contact / separation between the piston and the outer ring gear caused by transmission and stop of the braking device can be used as a clutch function or a braking function. Further, in the present invention, the one using serrations as the fixed connecting means for the internal gears of each stage and one of the rotating shafts has a simple structure and is suitable for transmitting a large power. Embodiments of the present invention will be described below with reference to the drawings. In the figure, 1 is a casing having a cylindrical inner peripheral surface. Reference numeral 2 denotes three outer ring gears whose inner and outer diameters are equal to each other and which are arranged rotatably on the same shaft with the outer peripheral surface along the inner peripheral surface of the casing 1 and at appropriate intervals. The outer ring gears 2 are arranged coaxially in the casing 1 by combining planetary gears 3, 4, 5 and inner gears 6, 7, 8 having different diameters with each other. The stepped planetary gear mechanisms A, B, and C are configured. In the illustrated embodiment, one rotary shaft 10 which is inserted into the casing 1 from the right hand in the figure and integrally connected to the internal gears 6, 7, 8 of each stage by serrations 9 is used as an input shaft. Further, four bearing discs 11, 12, 13, 1 are arranged so as to be located on both sides of the internal gears 6, 7, 8 of each stage.
4 is fitted to the rotary shaft 10 and is rotatably provided.
The four bearing discs 11, 12, 13, 14 are fitted to the rotary shaft 10 as a whole by fitting the gear shafts 15 of the planetary gears 3, 4, 5 of each stage from both sides and bearing both ends. It is configured to rotate integrally with each other. The other rotary shaft 16, which corresponds to the rotary shaft 10 and serves as an output shaft, is located on the outer surface of the bearing disk 11 at the outermost end on the left hand side of FIG. Connected to
Rotate integrally with each bearing disc. As shown in FIG. 2, braking devices 17 are arranged on the outer peripheral surface of the casing 1 at equal intervals in the circumferential direction. As shown in FIG. 1, each braking device 17 includes three cylinders 18, pistons 19, and return springs 2.
0, each piston 19 is provided at the inner end of the casing 1 so as to be able to come into contact with and separate from the outer peripheral surface of the outer ring gear 2 at each stage. Each braking device 17 is connected to a control device (not shown) so that the piston 19 is brought into contact with or separated from the outer ring gear 2 of each stage or two or more outer rings are selectively operated by the user. It is configured so that it can be brought into and out of contact with the gear at the same time. When the braking device 17 is operated to bring the piston 19 into pressure contact with one outer ring gear 2, the outer ring gear 2 can be stopped non-rotating and can be made stationary. When one outer ring gear 2 of the desired planetary gear mechanisms A, B, C is made stationary, the rotation of the rotary shaft (input shaft) 10 depends on the speed ratio of the planetary gear mechanism.
It is transmitted to the other rotary shaft (output shaft) 16 via all the bearing discs 11, 12, 13, 14. Also, two or more outer ring gears 2 and pistons 1
When it comes in and out of contact with 9, the rotation of the input and output shafts will be cut off or turned on and off, so this planetary gear mechanism A, B,
The transmission in which C and the braking device 17 are combined is a mechanism having both a clutch function and a braking function at the same time. In carrying out the present invention, the number of stages of the planetary gear mechanism is provided, and the accompanying braking device is hydraulic type, pneumatic type,
Needless to say, whether to use an electromagnetic type is a matter of design. In the figure, reference numeral 21 denotes a retaining ring having a wedge-shaped cross section fitted to the rotary shaft 10 so as to prevent rattling of the internal gears. Reference numeral 22 denotes a bearing mounted between the inner peripheral surface of each bearing disc and the rotary shaft 10. 23 is each gear shaft 1
Bearings installed on both ends of 5. Reference numeral 25 denotes a gap formed between the outer peripheral surface of the outer ring gear 2 and the inner peripheral surface of the casing 1. Reference numeral 26 is a bearing for bearings on both rotary shafts 10 and 16, respectively. 27 is an oil seal. Reference numeral 28 is a cover plate that covers the end surface of the casing 1. 29 is a stand for the casing 1. 3
Reference numeral 0 is a bearing disk assembly bolt. According to the present invention, the planets having different speed ratios are coaxially arranged in multiple stages with the interposition of the input and output shafts and the bearing discs bearing the both ends of the planetary gear. A gear mechanism,
A planetary gear type transmission that allows multiple gears to be changed in a single body by combining it with a braking device arranged on the outer peripheral surface of the casing has a large gear ratio and is suitable for transmission of large power. Moreover, the transmission becomes compact. Further, the transmission itself has a simple structure and has a clutch function and a brake function as well as a multi-stage gear shifting function. As described above, the present invention has an extremely excellent effect.

[Brief description of drawings] FIG. 1 is a partially cutaway vertical front view showing an embodiment of the present invention. FIG. 2 is a partially cutaway side view. [Explanation of symbols] 1 casing 2 outer ring gear 3, 4, 5 planetary gears 6, 7, 8 internal gear A, B, C Planetary gear mechanism 9 serrations 10 rotating shaft (input shaft) 11, 12, 13, 14 Bearing disc 15 gear shaft 16 rotating shaft (output shaft) 17 Braking device 18 cylinders 19 pistons 20 Return spring 21 stop ring 22 Bearing 23 Bearing 24 spacer 25 gap 26 Bearing 27 Oil seal 28 Lid 29 mounts 30 assembly bolts

Claims (1)

What is claimed is: 1. A plurality of outer ring gears, each having an inner diameter and an outer diameter equal to each other, are rotatably provided on the same axis line along an outer circumferential surface of an inner circumferential surface of a cylindrical casing. Planetary gears and internal gears with different diameters mesh with each outer ring gear, and multiple sets of planetary gear mechanisms with different rotation transmission ratios are provided on the same axis line in multiple stages. The internal gears are integrally connected to each other, rotatably fitted to the rotary shaft, and a plurality of bearing discs are arranged so as to be located on both sides of each internal gear. By fitting both ends of the gear shafts of the planetary gears and bearing the both ends, the bearing discs located on both sides of the internal gear are connected so as to rotate integrally, and the bearing circles located on the outermost side are connected. While connecting the other rotating shaft to the axis of the plate, the casing The outer periphery is equipped with a braking device equipped with pistons so as to come into contact with and separate from the outer peripheral surface of the outer ring gear of each stage at a plurality of positions in the circumferential direction, and the braking is applied to the outer ring gear of the planetary gear mechanism having a desired rotation transmission ratio. A transmission in which a predetermined gear shift is generated between one rotation shaft and the other rotation shaft by pressing a piston of the device and keeping the outer ring gear stationary. 2. The transmission according to claim 1, wherein serrations are used to connect the respective internal gears to the one rotating shaft.