JP2005106232A - Lubricating device in running transmission mechanism of running work machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mission case 8, mounted on a running on a running airframe 2, with a hydraulic/mechanical transmission mechanism constituted such that a hydraulic transmission mechanism 22 and a gear type transmission mechanism 24 are jointly used by a planetary gear mechanism 25, and reliably lubricate the planetary gear mechanism, in a running work machine in which the planetary gear mechanism is disposed at the portion, located higher than an oil level 52 of lubricating oil, of the interior of the mission case. <P>SOLUTION: The device is constituted such that an arbitrary one gear 42, rotated in a state that a part of the lower part of the outer periphery is immersed in lubricating oil, of various gears integrated in the mission case, forms a gear for lubrication. The upper part of the gear for lubrication is situated close to the planetary gear mechanism 25 such that lubricating oil jumping upward to the planetary gear mechanism 25 from the outer periphery of the gear for lubrication splashes on the planetary gear mechanism 25. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lubrication device for a speed change mechanism of a traveling speed of a traveling working machine such as a tractor used for agricultural work or a wheel loader used for civil engineering work.

Recently, in a traveling work machine such as a tractor or a wheel loader as described above, a hydraulic / mechanical structure in which a hydraulic transmission mechanism (HST) and a gear-type transmission mechanism are used together as a traveling transmission mechanism in a planetary gear mechanism. It is known in Patent Document 1 and the like that a speed change mechanism (HMT) is used.
JP, 2003-42261, A Conventionally, in such a hydraulic / mechanical transmission mechanism using a planetary gear mechanism as described above, the planetary gear mechanism is lubricated partially or entirely with the hydraulic / mechanical transmission mechanism. It is configured to be performed by immersing it in lubricating oil accumulated in a transmission case incorporating a mechanical transmission mechanism.

  However, although such a lubrication system has a very simple configuration, it is necessary to always immerse a part or all of the planetary gear mechanism in lubricating oil. However, when it is located at a high part in the mission case, the lubricating oil injected into the mission case is increased so that a part or all of the planetary gear mechanism is immersed in the lubricating oil, or The lubricating oil must be configured to be forcibly supplied to the planetary gear mechanism by a lubricating oil pump.

  In the former method, the oil level of the lubricating oil in the mission case is increased, which increases the amount of lubricating oil used and increases the risk of leakage of the lubricating oil. In addition, rotation with a plate immersed in the lubricating oil There is a problem that power loss increases due to an increase in the number of power transmission wheels such as gears to be used, and the latter method uses a lubricating oil pump. In addition, there is a problem that the size and the weight are increased.

  It is a technical object of the present invention to ensure that the planetary gear mechanism can be lubricated without increasing the oil level of the lubricating oil or using a dedicated lubricating oil pump. To do.

In order to achieve this technical problem, claim 1 of the present invention provides:
“A transmission case equipped with a hydraulic transmission mechanism and a gear transmission mechanism combined with a planetary gear mechanism is mounted on a transmission case mounted on a traveling body, and the planetary gear mechanism is connected to the transmission case. In the traveling work machine that is arranged in a part higher than the oil level of the lubricating oil,
Of the various gears built in the transmission case, any one gear that rotates in a state where a part of the outer peripheral lower part is immersed in the lubricating oil is used as the oiling gear, and the upper part of the oiling gear is the planetary gear. The lubricating oil that splashes upward from the outer periphery of the oil supply gear is close to the mechanism so as to splash on the planetary gear mechanism. "
It is characterized by that.

Further, claim 2 of the present invention provides
“In the description of claim 1, the carrier supporting each planetary gear in the planetary gear mechanism is provided with an annular groove extending in the circumferential direction, and the upper portion of the oiling gear is allowed to look into the annular groove. On the other hand, the planetary gear mechanism is provided with an oil passage that guides the lubricating oil in the annular groove to each planetary gear.
It is characterized by that.

Furthermore, claim 3 of the present invention provides
“In the description of claim 2, a gear for input to the planetary gear mechanism is fitted to the carrier in the planetary gear mechanism, and the input gear includes the left and right side walls of the annular groove. It constitutes the side wall surface opposite to each planetary gear. "
It is characterized by that.

  According to the configuration of the first aspect, the lubricating oil accumulated in the inner bottom portion of the mission case is moved to a position higher than the oil level of the lubricating oil by the rotation of any one gear incorporated in the mission case. Since the planetary gear mechanism that is positioned can be splashed, the oil level of the lubricating oil that is injected into the transmission case is increased, or the lubricating oil pump for the planetary gear mechanism is used. It is possible to reliably lubricate the planetary gear mechanism without the need to provide

  Further, according to the configuration of the second aspect, a large amount of lubricating oil can be collected in the annular groove, and the lubricating oil collected in the annular groove can be reliably supplied to each planetary gear through the oil passage. Therefore, there is an advantage that the lubricity in the planetary gear mechanism can be improved more reliably.

  Furthermore, by adopting the configuration of claim 3, the annular groove can be formed by using an input gear for the planetary gear mechanism, so that the configuration of providing the annular groove can be simplified. There is an advantage that an increase in the size of the annular groove can be minimized.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, drawings when an embodiment of the present invention is applied to a tractor as a traveling work machine will be described.

  1 and 2 show a tractor 1, which supports a traveling machine body 2 with a pair of left and right rear wheels 4 as well as a pair of left and right front wheels 3 and is mounted on a front portion of the traveling machine body 2. The engine 5 is configured to travel forward by driving the rear wheels 4 and the front wheels 3, and on the upper surface of the traveling machine body 2, the control seat 6 and the front wheels 3 are moved left and right. A steering handle 7 adapted to be steered by moving is provided, and the rotation of the engine 5 is appropriately shifted at the rear part of the traveling machine body 2 and transmitted to the rear wheels 4 and the front wheels 3. A mission case 8 is installed.

  In this case, the two rear wheels 4 have an axle case 9 projecting outward from the outer surface of the transmission case 8 with respect to the transmission case 8, and a gear case 10 extending rearward from the outer end of the axle case 9. It is attached via.

  A gear case 11 that covers the drive shaft 5 a on the engine 5 side is attached to the rear side of the engine 5, and a gear train mechanism 12 in the gear case 11 is provided under the gear case 11 from the drive shaft 5 a. The main drive shaft 13 to which power is transmitted is provided so as to protrude rearward, and a working hydraulic pump 14 is attached to the rear side surface of the gear case 11 so as to be directly connected to the drive shaft 5a. Yes.

  A hydraulic lifting mechanism 15 that is operated by the working hydraulic pump 14 is provided on the upper surface of the rear portion of the transmission case 8, and a PTO shaft 16 that protrudes rearward is provided on the rear end surface of the transmission case 8. A hydraulic motor 17 is attached, and the hydraulic motor 17 is configured to be operated by the working hydraulic pump 14.

  A telescopic power transmission shaft 19 having a universal shaft joint at both ends between the main shaft 13 projecting rearward from the gear case 11 and the input shaft 18 projecting forward from the front surface of the transmission case 8. And the rotation of the engine 5 is transferred from the drive shaft 5a to the input shaft 18 in the transmission case 8 through the gear train mechanism 12, the main drive shaft 13 and the power transmission shaft 19 in the gear case 11. Then, the transmission is appropriately shifted by a hydraulic / mechanical transmission mechanism (HMT) in the transmission case 8 and transmitted to the rear wheel 4 and both front wheels 3.

  That is, the hydraulic / mechanical transmission mechanism (HMT) in the transmission case 8 is a hydraulic continuously variable transmission mechanism using a transmission hydraulic pump 20 and a transmission hydraulic motor 21 operated by the hydraulic pump 20 as described below. The planetary gear mechanism 25 is used in combination with the (HST) 22 and a gear-type transmission mechanism 24 that is operated for shifting by the clutch 23.

  That is, as shown in FIG. 3, the transmission hydraulic pump 24 and the transmission hydraulic motor 25 are arranged on the front surface of the transmission case 8 on the hydraulic input shaft 26 and the hydraulic output shaft 27 that are pivotally supported in the transmission case 8. The gear 28 fixed on the input shaft 18 is meshed with an input gear 30 that is rotatably fitted on a sun gear shaft 29 in the planetary gear mechanism 25. A plurality of planetary gears 32 are rotatably supported on a carrier 31 fixed to the input gear 30 via a support shaft 33, and each planetary gear 32 is fixed to the sun gear shaft 29. 34 and an inner ring gear 35 that is rotatably fitted on the sangya shaft 29.

  Next, the gear 36 fixed to the inner ring gear 35 is meshed with a gear 37 fixed to the hydraulic input shaft 26 to rotationally drive the transmission hydraulic pump 20, while the hydraulic output shaft 27 is rotated. The rotation of the transmission hydraulic motor 21 is transmitted to the sun gear shaft 29 by meshing the gear 38 fixed on the top with the gear 39 fixed on the sun gear shaft 29.

  On the other hand, a rear wheel propulsion shaft 40 is pivotally supported in the transmission case 8, and the rear end of the propulsion shaft 40 is connected to a differential gear mechanism 41 for both the rear wheels 4, thereby The rear wheel 4 is configured to be driven to rotate by the wheel propulsion shaft 40, while the gear 42 fixed on the propulsion shaft 40 is supported on the front wheel propulsion shaft 43 that is pivotally supported in the mission case 8. A telescopic power having a universal shaft joint at both ends between the front wheel propulsion shaft 43 and the differential gear mechanism 45 for the front wheels 3. When a clutch 47 is provided on the front wheel propulsion shaft 43 and the clutch 47 is operated so as to fix the gear 44 to the propulsion shaft 43. The front wheels are driven by the rear wheel propulsion shaft 40. 3 is rotated, the clutch 47, when operating so as not to fix the gear 44 relative to the propeller shaft 43, constituting the two front wheels 3 so as not to rotate.

  In the gear-type transmission mechanism 24, one small-diameter transmission gear 48 of the two transmission gears 48 and 49 that are rotatably fitted on the rear wheel propulsion shaft 40 is fixed on the sun gear shaft 29. The other large-diameter transmission gear 49 is engaged with the gear 39 and the gear 50 fixed on the sun gear shaft 29, and the clutch 23 in the gear-type transmission mechanism 24 is engaged with the one small-diameter transmission gear 48 by the clutch 23. Is operated to be fixed to the propulsion shaft 40, the propulsion shaft 40 is rotated at a high speed, and the clutch 23 and the other large-diameter transmission gear 49 are fixed to the propulsion shaft 40 by the clutch 23. When operated as described above, the propulsion shaft 40 is rotated at a low speed, and the clutch 23 is not fixed to the intermediate shaft, that is, both the transmission gears 48 and 49 are fixed to the propulsion shaft 40. When the operation is neutral, the rotation transmission to the propulsion shaft 40 is interrupted, and further, between the high speed rotation by one small diameter transmission gear 48 and the low speed rotation by the other large diameter transmission gear 53. The hydraulic continuously variable transmission mechanism (HST) 22 is configured to change continuously.

  The rear wheel propulsion shaft 40 is provided with a brake mechanism 51 for the propulsion shaft 40.

  As shown in FIG. 4, the planetary gear mechanism 25 is located at a position higher than the oil level 52 of the lubricating oil stored in the mission case 8 in the mission case 8, while the rear The gear 42 fixed on the wheel propulsion shaft 40 is configured to rotate in a state in which a part of the outer peripheral lower portion is immersed in the oil surface 52 of the lubricating oil.

  The input gear 30 to the planetary gear mechanism 25 is fitted and fixed to the carrier 31 in the planetary gear mechanism 25 so that the input shaft 30 and the support shaft 33 of the planetary gear 32 of the carrier 31 are attached. An annular groove 53 extending in the circumferential direction is formed between the flange portion 31a and the upper portion of the gear 42 on the rear wheel propulsion shaft 40 is viewed in the annular groove 53.

  Each planetary gear 32 and its supporting shaft 33 in the planetary gear mechanism 25 are provided with oil passages 54 that communicate the inside of the annular groove 53 with the inner periphery and the outer periphery of each planetary gear 32.

  In this configuration, the gear 42 fixed on the rear wheel propulsion shaft 40 rotates at a position adjacent to the planetary gear mechanism 25 in a state where a part of the outer peripheral lower portion is immersed in the oil surface 52 of the lubricating oil. Since the lubricating oil is splashed upward from the outer periphery of the gear 42 and splashes against the planetary gear mechanism 25, the planetary gear mechanism 25 can be lubricated.

  In this case, the upper part of the gear 42 is projected into the annular groove 53 provided in the carrier 31 in the planetary gear mechanism 25, so that the lubricating oil splashed upward by the rotation of the gear 42 is absorbed by the annular groove. A large amount of oil is collected in the annular groove 53, and the lubricating oil in the annular groove 53 is connected to each planetary gear 32, its support shaft 33, the sliding portion, and each planetary planet through an oil passage 54 communicating with the annular groove 53. Oil is supplied to the gear 32, the inner ring gear 35 and the meshing portion.

  In the above-described embodiment, one gear 42 on the rear wheel propulsion shaft 40 is used as an oil supply gear for the planetary gear mechanism 25 so that the oil supply gear is inserted into the annular groove 53. However, the present invention is not limited to this, and any one gear on the shaft located below the planetary gear mechanism 25 is used as an oil supply gear for the planetary gear mechanism 25. It goes without saying that it is also good.

It is a side view which shows the tractor to which embodiment of this invention is applied. It is a top view of FIG. It is a skeleton diagram of power transmission. It is principal part sectional drawing of a mission case.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tractor 2 Traveling machine body 3 Front wheel 4 Rear wheel 5 Engine 8 Transmission case 20 Transmission hydraulic pump 21 Transmission hydraulic motor 22 Hydraulic transmission mechanism 24 Mechanical transmission mechanism 25 Planetary gear mechanism 30 Input gear 31 Carrier 32 Planetary gear 33 Support shaft 34 Sun gear 35 Inner ring gear 52 Lubricating oil level 53 Annular groove 42 Lubrication gear

Claims (3)

A transmission case mounted on the traveling body is equipped with a hydraulic / mechanical transmission mechanism having a configuration in which a hydraulic transmission mechanism and a gear transmission mechanism are used together in a planetary gear mechanism, and the planetary gear mechanism is installed in the transmission case. In the traveling work machine that is arranged in a part higher than the oil level of the lubricating oil,
Of the various gears built in the transmission case, any one gear that rotates in a state where a part of the outer peripheral lower part is immersed in the lubricating oil is used as the oiling gear, and the upper part of the oiling gear is the planetary gear. A lubricating device in a traveling speed change mechanism of a traveling work machine, characterized in that the lubricating oil splashing upward from the outer periphery of the oil supply gear is close to the mechanism so as to splash on the planetary gear mechanism.   2. The carrier according to claim 1, wherein an annular groove extending in a circumferential direction is provided in a carrier supporting each planetary gear in the planetary gear mechanism, and the upper portion of the oil supply gear is looked into the annular groove. A lubrication device in a traveling speed change mechanism of a traveling working machine, wherein the planetary gear mechanism is provided with an oil passage that guides the lubricating oil in the annular groove to each planetary gear.   In the description of claim 2, a gear for input to the planetary gear mechanism is fitted to the carrier in the planetary gear mechanism, and each of the left and right wall surfaces of the annular groove is the input gear. A lubricating device in a traveling speed change mechanism of a traveling working machine, characterized in that it forms a side wall surface opposite to a planetary gear.

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