JPH0665657U - Transmission for wheeled vehicle - Google Patents

Abstract

(57) [Abstract] [Purpose] In a transmission for a vehicle equipped with a combination of an engine-driven high speed range speed stage and a hydraulic motor-driven low speed range speed range, a high speed planetary gear speed change section and a low speed planetary gear speed change section. The mutual reduction ratio and the inter-step ratio can be individually set to desired values without changing the axial distance. [Structure] The output torque of the low speed planetary gear transmission unit 10 is
It is transmitted to the output shaft 91 via the low speed transfer gear 61 and the drive large gear 92. Further, the output torque of the high-speed planetary gear transmission unit 30 is passed through a high-speed transfer gear 66, an idler gear 67 that idles on the planet carrier 14 of the planetary gear device 11 of the low-speed planetary gear transmission unit 10, and a drive pinion 93. Transmitted to the output shaft 91. By independently providing the power transmission paths from the low-speed and high-speed planetary gear speed change units 10 and 30 to the output shaft 91 in this manner, the axial distance between the first shaft 1a and the second shaft 1b is kept constant. It is possible to change the reduction ratio and the inter-stage ratio.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transmission for a wheeled vehicle.

[0002]

[Prior art]

 The present inventor has proposed Japanese Patent Application Nos. 3-224914, 3-327107, etc. as wheeled vehicle transmissions capable of changing the power distribution to the work machine and the traveling device according to the purpose. Furthermore, Japanese Patent Application No. 4-156129 was proposed for the purpose of providing a transmission for a wheeled vehicle in which the axial configurational dimension of the transmission is shortened and the outer diameter of the planetary gear transmission is small. As shown in FIG. 2, an example of this transmission includes a low speed planetary gear transmission unit 10, a high speed planetary gear transmission unit 30, a transfer gear unit 62, a drive gear unit 70, a reduction gear unit 80 and an output unit 90. , A high speed planetary gear shifting unit 30 driven by the engine 2 arranged on one side of the speed change device 1 and a low speed planetary gear shifting driven by a hydraulic motor 4 arranged on the other side of the speed change device 1. The section 10 is arranged in parallel. Each planetary gear unit 11, 21, 31, 41, 51 has a sun gear 15, 25, 35, 45, 55 input, and engages one of the ring gear fixed clutches 13, 23, 33, 43, 53. Then, by fixing the ring gears 12, 22, 32, 42, 52, the final output is from the planet carrier 14 or 34. Then, these powers drive the drive gear 94 of the output unit 90 via the transfer gear unit 62 and are transmitted to the output shaft 91. With such a configuration, the axial length of the transmission is shortened and the torque input to the first shaft 1a is smaller than in the conventional case, so that each planetary gear device can be downsized.

[0003]

[Problems to be solved by the device]

 In the transmission according to Japanese Patent Application No. 4-156129, the transfer gear 63 for transmitting the power from the low speed planetary gear shifting unit 10 to the output unit 90 and the power for transmitting the power from the high speed planetary gear shifting unit 30 to the output unit 90 are transmitted. It also serves as an idler gear. Therefore, the reduction ratio and the step ratio between the high speed range and the low range speed are adjusted according to the running performance required for the wheeled vehicle, that is, the traction performance and vehicle speed performance, or each performance of the engine and hydraulic motor. When setting or changing, it is difficult to make the desired setting or change without changing the axial distance between the high-speed planetary gear transmission and the low-speed planetary gear transmission. Therefore, the present invention focuses on the above-mentioned conventional problems, and adapts the mutual reduction ratio and step ratio of the high-speed planetary gear transmission unit and the low-speed planetary gear transmission unit to the vehicle application or each performance of the engine and hydraulic motor. Thus, it is an object of the present invention to provide a transmission for a wheeled vehicle that can be individually set or changed to a desired value.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, a transmission for a wheeled vehicle according to the present invention is provided with a second shaft for inputting an output torque of an engine from one side of the transmission and a transmission arranged parallel to the second shaft. A low-speed planet composed of a first shaft for inputting the output torque of the hydraulic motor from the other side, an output shaft arranged in parallel with the first shaft, and a plurality of planetary gear devices arranged on the first shaft. A gear shift unit, a high-speed planetary gear shift unit including a plurality of planetary gear devices arranged on a second shaft, and a low-speed transfer gear unit transmitting the output of the low-speed planetary gear shift unit to an output shaft. , A high-speed transfer gear unit that transmits the output of the high-speed planetary gear transmission unit to an output shaft via an idler gear that is idle coaxially with one planet carrier of the low-speed planetary gear transmission unit; To the hydraulic pump installed on the side A drive gear unit that transmits the output torque of the engine via the second shaft, and a reduction gear unit that inputs the output torque of the hydraulic motor, which is arranged on the other side of the transmission and is capable of forward and reverse rotation, to the first shaft. In such a configuration, the output torque of the hydraulic motor driven by the hydraulic pump is transmitted to the first shaft through the reduction gear unit, and the low-speed planetary gears arranged on the first shaft are arranged. By engaging a ring gear fixed clutch of any one of the plurality of planetary gear units of the transmission unit, the output torque of the hydraulic motor input to the sun gear of the planetary gear unit having the fixed ring gear is transmitted to the planetary gear unit. Transmission to the low-speed transfer gears via the carrier, or via the planet carrier and the adjacent planetary gearing ring gear, planet carrier, A forward / reverse low speed range that is transmitted to the output shaft via the drive gear that is fixed to the output shaft, and a plurality of planetary gears that transmit the output torque of the engine to the second shaft and are arranged on the second shaft. By engaging the ring gear fixed clutch of any one of the devices, the output torque of the engine input to the sun gear of the planetary gear device having the fixed ring gear is transmitted via the planet carrier or to the planet carrier. And a drive fixed to the output shaft and an idler gear that is transmitted coaxially to one planet carrier of the low-speed planetary gear transmission section, and is transmitted to the high-speed transfer gear via the ring gear and planet carrier of the adjacent planetary gear unit. It is equipped with a forward high speed range speed stage that is transmitted to the output shaft via a small gear.

[0005]

[Action]

 According to the above configuration, the basic configurations of the high-speed planetary gear transmission and the low-speed planetary gear transmission are the same as those proposed in Japanese Patent Application No. 4-156129, and the high-speed transfer unit and the low-speed transfer unit are provided independently. Therefore, while maintaining a constant axial distance between the high-speed planetary gear transmission and the low-speed planetary gear transmission, the mutual reduction ratio and step between the high-speed planetary gear transmission and the low-speed planetary gear transmission are maintained. The ratio can be set or changed individually, and the desired reduction ratio and interstage ratio can be obtained.

[0006]

【Example】

 An embodiment of a transmission for a wheeled vehicle according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a power transmission path of a transmission for a wheeled vehicle having speed stages of forward 5th speed and reverse 2nd speed. The transmission 1 includes a low speed planetary gear transmission unit 10 arranged on a first shaft 1a and a high speed planetary gear arranged on a second shaft 1b provided in parallel with the first shaft 1a. The gear shift unit 30, the low speed transfer gear unit 60, the high speed transfer gear unit 65, the drive gear unit 70, the reduction gear unit 80, and the output unit 90 are included. The low speed planetary gear transmission unit 10 includes a first speed planetary gear device 11 and a second speed planetary gear device 21, and a ring gear 12 of the first speed planetary gear device 11 and a ring gear of the second speed planetary gear device 21. The rotation of 22 is fixed by the engagement of the ring gear fixed clutches 13 and 23, respectively. The planet carrier 24 of the second-speed planetary gear device 21 is connected to the ring gear 12 of the first-speed planetary gear device 11.

The high-speed planetary gear transmission unit 30 includes a third-speed planetary gear device 31, a fourth-speed planetary gear device 41, a fifth-speed planetary gear device 51, and ring gears 32, 4 of the third-speed planetary gear device 31. The ring gear 42 of the speed planetary gear unit 41 and the ring gear 52 of the fifth speed planetary gear unit 51 are fixed when the ring gear fixed clutches 33, 43 and 53 are engaged, respectively. The planet carrier 44 of the fourth speed planetary gear device 41 is connected to the ring gear 32 of the third speed planetary gear device 31, and the planet carrier 54 of the fifth speed planetary gear device 51 is connected to the ring gear 42 of the fourth speed planetary gear device 41. It is connected. The low-speed transfer gear unit 60 is composed of a low-speed transfer gear 61 fixed to the tip of the planet carrier 14 of the first-speed planetary gear unit 11, and the high-speed transfer gear unit 65 is included in the third-speed planetary gear unit 31. By a high speed transfer gear 66 fixed to the planet carrier 34 and an idler gear 67 which is coaxially attached to the planet carrier 14 of the first speed planetary gear unit 11 so as to rotate freely and meshes with the high speed transfer gear 66. It is configured. The output section 90 is provided with an output shaft 91 provided in parallel with the first shaft 1a, a drive large gear 92 fixed to the output shaft 91 and meshing with the low speed transfer gear 61, and a drive small gear meshing with the idler gear 67. And 93.

The sun gears 15 and 25 of the low-speed planetary gear speed change unit 10 are fixed to the first shaft 1a, and the reduction large gear 81 of the reduction gear unit 80 is fixed to the end of the first shaft 1a. ing. Further, the sun gears 35, 45, 55 of the high-speed planetary gear speed change unit 30 are fixed to the second shaft 1b directly connected to the output shaft of the engine 2, and the drive gear unit is attached to the end of the second shaft 1b. The gear 71 of 70 is fixed. The hydraulic pump drive gear 72 fixed to the drive shaft 3a of the hydraulic pump 3 meshes with the gear 71, and the rotation of the engine 2 drives the hydraulic pump 3. The hydraulic motor 4 is driven by the hydraulic pump 3 and can rotate in both forward and reverse directions. The small reduction gear 82 fixed to the output shaft 4a of the hydraulic motor 4 meshes with the large reduction gear 81, and the rotation of the hydraulic motor 4 causes the first shaft 1a to rotate. A part of the pressure oil discharged by the hydraulic pump 3 is used for lubricating the transmission 1.

In the transmission having the above structure, when the hydraulic motor 4 is used as a drive source, forward and backward two stages each can be switched in a low speed range, and when the engine 2 is used as a drive source, three forward stages can be performed in a high speed range. Can be switched. Here, the forward and reverse first speeds and the forward fifth speed will be taken as an example to explain the respective power transmission paths. In the forward or reverse first speed, the output torque of the hydraulic motor 4 is transmitted to the first shaft 1a via the small reduction gear 82 and the large reduction gear 81, and the sun gears 15 and 25 are driven. At this time, since the ring gear fixed clutch 13 of the first speed planetary gear unit 11 is engaged, the power is transmitted to the drive large gear 92 of the output section 90 via the low speed transfer gear 61 fixed to the planet carrier 14. , Is taken out from the output shaft 91. In the case of the fifth forward speed, the output torque of the engine 2 is transmitted to the second shaft 1b, and the sun gears 35, 45, 55 of the high speed planetary gear speed changing unit 30 are driven. At this time, since the ring gear fixing clutch 53 of the fifth speed planetary gear set 51 is engaged, the power is transmitted to the ring gear 42 of the fourth speed planetary gear set 41 via the planet carrier 54, and further the planet carrier 44. Is transmitted to the ring gear 32 of the planetary gear device 31 for the third speed via. Then, it is transmitted from the high speed transfer gear 66 fixed to the planet carrier 34 to the driving small gear 93 of the output portion 90 via the idler gear 67, and is taken out from the output shaft 91.

[0010]

[Effect of device]

 As described above, according to the present invention, the low-speed planetary gear speed changing unit and the high-speed planetary gear changing unit each including a plurality of planetary gear devices are provided on the first shaft and the second shaft, which are provided in parallel with each other. However, the output torque of the low-speed planetary gear transmission is to be transmitted to the output shaft via the low-speed transfer gear, and the output torque of the high-speed planetary gear transmission is that of the high-speed transfer gear and the low-speed planetary gear transmission. It is transmitted to the output shaft via an idler gear that idles on the planet carrier. In this way, the low-speed transfer section and the high-speed transfer section are separated and provided independently, so that the axial distance between the low-speed planetary gear transmission and the high-speed planetary gear transmission can be maintained at a constant value. It is now possible to set or change each reduction ratio and interstage ratio individually, and set the reduction ratio and interstage ratio to meet vehicle performance requirements or engine and hydraulic motor performance. Alternatively, it becomes easy to change.

[Brief description of drawings]

FIG. 1 is a diagram showing a power transmission path of a transmission for a wheeled vehicle according to the present invention.

FIG. 2 is a diagram showing a power transmission path of a transmission for a wheeled vehicle according to Japanese Patent Application No. 4-156129.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Transmission 1a 1st shaft 1b 2nd shaft 2 Engine 3 Hydraulic pump 4 Hydraulic motor 4a, 91 Output shaft 10 Low speed planetary gear transmission unit 11 1st speed planetary gear device 12, 22, 32, 42, 52 Ring gear 13, 23, 33, 43, 53 Ring gear fixed clutch 14, 24, 34, 44, 54 Planet carrier 15, 25, 35, 45, 55 Sun gear 21 2nd speed planetary gear device 30 High speed planetary gear transmission 31 31 3rd speed planet Gear device 41 4th speed planetary gear device 51 5th speed planetary gear device 60 Low speed transfer gear unit 61 Low speed transfer gear unit 65 High speed transfer gear unit 66 High speed transfer gear 67 Idler gear 70 Drive gear unit 80 Reduction gear unit 92 Drive Large gear 93 Drive small gear

Claims (2)

[Scope of utility model registration request] 1. A second shaft for inputting an output torque of an engine from one side of a transmission, and a first shaft arranged in parallel with the second shaft for inputting an output torque of a hydraulic motor from the other side of the transmission. A shaft, an output shaft arranged in parallel with the first shaft, a low speed planetary gear transmission unit composed of a plurality of planetary gear devices arranged on the first shaft, and a plurality of parts arranged on the second shaft. A high-speed planetary gear transmission unit comprising a plurality of planetary gear devices, a low-speed transfer gear unit that transmits the output of the low-speed planetary gear transmission unit to an output shaft, and an output of the high-speed planetary gear transmission unit to the low-speed planetary gear transmission unit. High speed transfer gear unit that transmits to an output shaft via an idler gear that rotates coaxially with one planet carrier of the planetary gear transmission unit, and a hydraulic pump disposed on the other side of the transmission unit through the second shaft. Drive that transmits engine output torque A wheel portion, the other side transmission for a wheeled vehicle, characterized in that the output torque of the forward and reverse rotatable hydraulic motor which is arranged constituted by a reduction gear unit to be input to the first axis of the transmission. 2. An output torque of a hydraulic motor driven by a hydraulic pump is transmitted to a first shaft via a reduction gear unit,
It is input to the sun gear of the planetary gear unit having the fixed ring gear by engaging any one of the ring gear fixed clutches of the plurality of planetary gear units of the low speed planetary gear shifting unit arranged on the shaft. The output torque of the hydraulic motor is transmitted to the low-speed transfer gear via the planet carrier, or the ring gear of the planetary gear unit and the adjacent planetary gear device, and the planet carrier, and further, the drive large gear fixed to the output shaft is transmitted. A forward / reverse low-speed range speed stage that is transmitted to the output shaft via an output shaft, and a ring gear fixed clutch that transmits the output torque of the engine to the second shaft and is arranged on the second shaft. The engine output torque input to the sun gear of the planetary gear train having a fixed ring gear. Luke is transmitted to the high-speed transfer gear via the planet carrier or via the planet carrier and the ring gear of the planetary gear unit and the planet carrier adjacent to the planet carrier, and is further coaxial with one planet carrier of the low-speed planetary gear shifting unit. 2. The transmission for a wheeled vehicle according to claim 1, further comprising: a forward high speed range speed stage that is transmitted to the output shaft through an idler gear that idles at a low speed and a drive small gear that is fixed to the output shaft.