Tracked work machine

Abstract

According to the present invention, a bulldozer (1) comprises a left planetary gear mechanism (30L), a left steering clutch (40L), and a first clutch gear (91). The left planetary gear mechanism (30L) is disposed between an input shaft (26) and a left output shaft (60L). The left steering clutch (40L) switches the transmission and cutoff of rotary power from the input shaft (26) to the left output shaft (60L) by means of the left planetary gear mechanism (30L). The first clutch gear (91) is attached to the left steering clutch (40L). The left steering clutch (40L) can engage with or disengage from a left sun gear (33L). The first clutch gear (91) is fixed in a non-rotatable manner.

Description

[Technical field]

[0001] The present disclosure relates to a track-type work machine. [Background technology]

[0002] Conventionally, a track-type work machine (such as a bulldozer) is provided with left and right steering brakes that brake left and right output shafts connected to left and right drive wheels, and a steering clutch that is attached to an input shaft located between the left and right output shafts and transmits or cuts off rotational power from the input shaft to the output shaft (see, for example, Patent Document 1).

[0003] A track-type work machine can turn left and right by hydraulically controlling a steering clutch and a steering brake. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-91491 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the track-type working machine described in Patent Document 1, the steering clutch is directly attached to the input shaft, so a large torque passes through the steering clutch, which requires the steering clutch to have high rigidity and makes it impossible to reduce the size of the steering clutch.

[0006] An object of the present disclosure is to provide a track-type work machine in which the steering clutch can be made smaller. [Means for solving the problem]

[0007] A track-type work machine according to one aspect of the present disclosure includes a planetary gear mechanism, a steering clutch, and a clutch gear. The planetary gear mechanism is disposed between an input shaft and an output shaft. The steering clutch switches between transmitting and cutting off rotational power from the input shaft to the output shaft by the planetary gear mechanism. The clutch gear is attached to the steering clutch. The planetary gear mechanism has a ring gear connected to the input shaft, a sun gear attached rotatably to the input shaft, a planetary gear disposed between the ring gear and the sun gear, and a carrier connected to the planetary gear and the output shaft. The steering clutch can be engaged or disengaged with respect to the sun gear. The clutch gear is fixed so as not to rotate. Effect of the Invention

[0008] According to the track-type work machine according to the present disclosure, the steering clutch can be made smaller. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a bulldozer, which is an example of a track-type work machine. [Diagram 2] FIG. 2 is a cross-sectional view of a power transmission system of a bulldozer. [Diagram 3] FIG. 2 is a schematic system configuration diagram of a power transmission system of a bulldozer. [Figure 4] FIG. 2 is a schematic system configuration diagram of a power transmission system of a bulldozer. [Diagram 5] FIG. 2 is a cross-sectional view of a power transmission system of a bulldozer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (Bulldozer 1 Configuration) Fig. 1 is a perspective view of a bulldozer 1 which is an example of a track-type working machine. Fig. 2 is a cross-sectional configuration diagram of a power transmission system of the bulldozer 1. Fig. 3 is a schematic system configuration diagram of the power transmission system of the bulldozer 1.

[0011] The bulldozer 1 includes left and right traveling devices 4L, 4R having left and right sprockets 2L, 2R and left and right crawlers 3L, 3R, a blade 5 provided at the front of the vehicle, and a ripper device 6 provided at the rear of the vehicle.

[0012] The bulldozer 1 can perform work such as pushing earth with the blade 5 and work such as crushing and excavation with the ripper device 6 .

[0013] The bulldozer 1 has an engine 10, a power transmission device 20, left and right planetary gear mechanisms 30L, 30R, left and right steering clutches 40L, 40R, left and right steering brakes 50L, 50R, left and right output shafts 60L, 60R, and left and right final reduction gears 70L, 70R.

[0014] The power transmission device 20 transmits power from the engine 10 to the left and right planetary gear mechanisms 30L, 30R. The power transmission device 20 includes a power take-off device (power take-off) 21, a torque converter 22, a transmission 23, a pinion 24, a bevel gear 25, and an input shaft 26.

[0015] The power take-off device 21 transmits the power from the engine 10 to the torque converter 22. The torque converter 22 transmits the power of the engine 10 transmitted from the power take-off device 21 to the transmission 23 via a fluid. The transmission 23 changes the speed of the rotational motion transmitted from the torque converter 22. The transmission 23 is switchable between forward and reverse. The transmission 23 is connected to a pinion 24. The power from the transmission 23 is transmitted to an input shaft 26 via the pinion 24 and a bevel gear 25.

[0016] The left and right planetary gear mechanisms 30L, 30R are disposed between the input shaft 26 and the left and right output shafts 60L, 60R. The left and right planetary gear mechanisms 30L, 30R include left and right ring gears 31L, 31R, left and right planetary gears 32L, 32R, left and right sun gears 33L, 33R, and left and right carriers 34L, 34R.

[0017] The left and right ring gears 31L, 31R are connected to the input shaft 26. The left and right planetary gears 32L, 32R are disposed inside the left and right ring gears 31L, 31R in a radial direction perpendicular to the axis of the input shaft 26. The left and right planetary gears 32L, 32R mesh with the left and right ring gears 31L, 31R and the left and right sun gears 33L, 33R. The left and right sun gears 33L, 33R are rotatably attached to the input shaft 26. The left and right sun gears 33L, 33R are disposed inside the left and right planetary gears 32L, 32R in a radial direction. The left and right sun gears 33L, 33R are connected to the left and right steering clutches 40L, 40R. The left and right carriers 34L, 34R are connected to the left and right planetary gears 32L, 32R and the left and right output shafts 60L, 60R.

[0018] The left and right steering clutches 40L, 40R are wet multi-plate clutches that can be engaged or disengaged with the left and right sun gears 33L, 33R. The left and right steering clutches 40L, 40R switch between transmitting and cutting off rotation from the input shaft 26 to the left and right output shafts 60L, 60R by the left and right planetary gear mechanisms 30L, 30R.

[0019] Specifically, when the left steering clutch 40L is engaged and the left sun gear 33L is directly connected to the first clutch gear 91, the first clutch gear 91 is unable to rotate (described later), and therefore the left sun gear 33L is also unable to rotate. Then, the rotation of the input shaft 26 is transmitted to the left output shaft 60L via the left ring gear 31L, the left planetary gear 32L, and the left carrier 34L. Also, when the left steering clutch 40L is released and the left sun gear 33L is in a free rotating state, the rotation from the input shaft 26 to the left output shaft 60L is cut off. Similarly, the right steering clutch 40R switches between transmission and cut-off of the rotation from the input shaft 26 to the right output shaft 60R depending on whether it is engaged or released.

[0020] Here, a first clutch gear 91 is attached to the left steering clutch 40L. The first clutch gear 91 is fixed so as not to be rotatable. The first clutch gear 91 is directly connected to an idler gear 93.

[0021] A second clutch gear 92 is attached to the right steering clutch 40R. The second clutch gear 92 is fixed so as not to rotate. The second clutch gear 92 is indirectly connected to an idler gear 93 via a first transfer gear 95, a countershaft 96, and a second transfer gear 97.

[0022] The idler gear 93 is connected to a pinion gear 94. A pinion shaft 94a is connected to the pinion gear 94. The pinion shaft 94a is fixed by a fixing member 98 so as not to rotate.

[0023] In this manner, in the present embodiment, the pinion gear 94 is fixed so as to be unrotatable by fixing the pinion shaft 94a so as to be unrotatable. Furthermore, by fixing the pinion gear 94 so as to be unrotatable, the first clutch gear 91 and the second clutch gear 92 are each fixed so as to be unrotatable.

[0024] Therefore, no rotational power is applied from the left and right steering clutches 40L, 40R to the left and right sun gears 33L, 33R. Therefore, in the configuration shown in Fig. 3, the first clutch gear 91, the second clutch gear 92, the idler gear 93, the pinion gear 94, the first transfer gear 95, the countershaft 96 and the second transfer gear 97 only have the function of braking (fixing) the left and right sun gears 33L, 33R when the left and right steering clutches 40L, 40R are engaged.

[0025] Here, the fixing member 98 is detachably fixed to a housing (not shown). When the fixing member 98 is removed from the housing, the fixing member 98 can also be removed from the pinion gear 94. As a result, the fixing of the pinion gear 94 by the fixing member 98 is released.

[0026] When the fixing of the pinion gear 94 by the fixing member 98 is released, a rotation motor 99 can be attached to the pinion shaft 94a, as shown in Fig. 4. In this embodiment, the rotation motor 99 is a hydraulic pump driven by the power of the engine 10 transmitted from the power take-off device 21.

[0027] In this way, when the pinion shaft 94a is released from its fixed position, the first clutch gear 91 and the second clutch gear 92 become rotatable, and the rotational power of the turning motor 99 can be applied to the left and right sun gears 33L, 33R via the left and right steering clutches 40L, 40R.

[0028] Specifically, when the left and right steering clutches 40L, 40R are engaged and the rotational power of the motor is transmitted to the left and right sun gears 33L, 33R via the left and right steering clutches 40L, 40R, the left and right sun gears 33L, 33R rotate in opposite directions at the same rotation speed, which creates a rotation speed difference between the left and right output shafts 60L, 60R, allowing the bulldozer 1 to make gentle turns to the left and right.

[0029] As described above, when the rotation motor 99 is attached to the pinion shaft 94a, the first clutch gear 91, the second clutch gear 92, the idler gear 93, the pinion gear 94, the first transfer gear 95, the countershaft 96 and the second transfer gear 97 function as a transmission section that transmits the rotational power of the rotation motor 99 to the left and right sun gears 33L, 33R.

[0030] The left and right steering brakes 50L, 50R brake the rotation of the left and right output shafts 60L, 60R. The left and right steering brakes 50L, 50R are wet multi-plate clutches that can be engaged with or disengaged from the left and right output shafts 60L, 60R.

[0031] When the left steering brake 50L is engaged, the rotation of the left output shaft 60L is braked, which results in a reduction in the rotation of the left final reduction gear 70L connected to the left sprocket 2L. When the right steering brake 50R is engaged, the rotation of the right output shaft 60R is braked, which results in a reduction in the rotation of the right final reduction gear 70R connected to the right sprocket 2R.

[0032] (Features) The bulldozer 1 includes a left planetary gear mechanism 30L, a left steering clutch 40L, and a first clutch gear 91. The left planetary gear mechanism 30L is disposed between the input shaft 26 and the left output shaft 60L. The left steering clutch 40L switches between transmission and interruption of rotational power from the input shaft 26 to the left output shaft 60L by the left planetary gear mechanism 30L. The first clutch gear 91 is attached to the left steering clutch 40L. The left steering clutch 40L can be engaged or disengaged with respect to the left sun gear 33L. The first clutch gear 91 is fixed so as not to be rotatable.

[0033] In this way, since the left steering clutch 40L is attached to the left sun gear 33L, the torque passing through the left steering clutch 40L can be reduced. Therefore, since there is no need to excessively increase the rigidity of the left steering clutch 40L, the left steering clutch 40L can be made smaller. This effect can also be obtained with the right steering clutch 40R.

[0034] In addition, because the first clutch gear 91 is fixed so as not to rotate, the left sun gear 33L can be easily braked, and when the first clutch gear 91 is released from its fixed state, it can be easily modified to a configuration that allows rotational power to be transmitted to the left sun gear 33L via the left steering clutch 40L. This effect can also be obtained by the second clutch gear 92.

[0035] (Modification of the embodiment) The present invention is not limited to the above-described embodiments, and various modifications and alterations are possible without departing from the scope of the present invention.

[0036] (Variation 1) In the above embodiment, the pinion gear 94 is fixed so as to be unrotatable by fixing the pinion shaft 94a so as to be unrotatable, but the method of fixing the pinion gear 94 is not limited to this. For example, the teeth of the pinion gear 94 may be fixed directly.

[0037] (Variation 2) In the above embodiment, the first clutch gear 91 and the second clutch gear 92 are coupled to the pinion gear 94 via the idler gear 93, but as shown in Fig. 5, the idler gear 93 can be omitted. In this case, the first clutch gear 91 and the second clutch gear 92 can be fixed unrotatably by fixing the idler gear 93 unrotatably instead of the pinion gear 94. In the example shown in Fig. 5, the idler gear 93 is fixed unrotatably by a plurality of idler gear bolts 100 as fixing members, but the number of idler gear bolts 100 is not particularly limited as long as it is one or more.

[0038] (Variation 3) In the above embodiment, the first clutch gear 91 and the second clutch gear 92 are each fixed to be unrotatable by fixing the pinion gear 94 to be unrotatable, but this is not limited to the above. For example, even if the pinion gear 94 is present, the first clutch gear 91 and the second clutch gear 92 can be fixed to be unrotatable by fixing the idler gear 93 to be unrotatable instead of the pinion gear 94. In this case, the idler gear bolt 100 shown in FIG. 5 can be used to fix the idler gear 93. [Explanation of symbols]

[0039] 1. Bulldozer 10 Engine 20 Power transmission device 26 Input shaft 30L, 30R Left and right planetary gear mechanisms 31L, 31R Left and right ring gears 32L, 32R Left and right planetary gears 33L, 33R Left and right sun gears 34L, 34R Left and right carriers 40L, 40R Left and right steering clutches 50L, 50R Left and right steering brakes 60L, 60R Left and right output shafts 70L, 70R Left and right final reduction gears 91 First clutch gear 92 Second clutch gear 93 Idle Gear 94 Pinion Gear 95 1st transfer gear 96 Secondary shaft 97 2nd transfer gear 98 Fixing member 99 Swing motor

Claims

1. a planetary gear mechanism disposed between an input shaft and an output shaft; a steering clutch for switching between transmission and interruption of rotational power from the input shaft to the output shaft by the planetary gear mechanism; a clutch gear attached to the steering clutch; Equipped with The planetary gear mechanism includes: A ring gear connected to the input shaft; a sun gear rotatably attached to the input shaft; a planetary gear disposed between the ring gear and the sun gear; a carrier connected to the planetary gear and the output shaft; having the steering clutch is capable of engaging or disengaging with respect to the sun gear, The clutch gear is fixed so as not to rotate. Tracked work machine.

2. an idler gear connected to the clutch gear; a pinion gear connected to the idler gear; Equipped with At least one of the idler gear and the pinion gear is fixed so as to be non-rotatable, thereby fixing the clutch gear so as to be non-rotatable.

2. The track-type working machine according to claim 1.

3. A pinion gear is provided which is connected to the clutch gear, The pinion gear is fixed so as to be unrotatable, and thereby the clutch gear is fixed so as to be unrotatable.

2. The track-type working machine according to claim 1.

4. A pinion shaft is connected to the pinion gear, The pinion shaft is fixed so as to be unrotatable, and thereby the clutch gear is fixed so as to be unrotatable.

4. A track-type working machine according to claim 2 or 3.

5. When the pinion shaft is removed from the fixed position, a rotation motor can be attached to the pinion shaft.

5. The track-type working machine according to claim 4.

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