JP2001114129A - Transmission of traveling vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a converntional transmission case such that when a high rotation gear exists under a discharge port for lubricating oil, an oil film is produced so that lubricating oil can not be spread well. SOLUTION: In this transmission having a traveling speed changing HST 60 and a steering HST 90 disposed on the transmission case 17, operating fluid is supplied from one HST to the other HST through an oil passage 33 provided in the interiror of the transmission case, and the operating fluid is returned from the other HST through the discharge port 35 to the transmission case. In the transmission, a wall 33c of the oil passage is disposed between the discharge port and a gear adjacent to the discharge port.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling vehicle such as a construction machine or an agricultural machine, and more particularly to a traveling speed change steering and steering HST.
The present invention relates to a configuration of a transmission including:

[0002]

2. Description of the Related Art Conventionally, HST for traveling speed change and H for steering have been conventionally used.
A combine in which the ST is arranged on a transmission case is known, and a gear-type transmission and a planetary-gear-type reduction gear are housed in the transmission case. In addition, the lubricating oil filled in the transmission case is used as hydraulic oil for both HSTs, the lubricating oil in the transmission case is sucked by a charge pump and supplied to one HST, and the drain oil is further supplied to the other HST. After sending oil, the drain oil was returned to the mission case for lubrication.

[0003]

In order to slide the slider of the gear type transmission, the slider is engaged with a shifter fork, and a pin is fitted and inserted into the tip of the shifter fork. However, there is a risk of falling off during assembling, and the assembling may take time.

Further, if the lubricating oil is returned to the transmission case at a position above the gear, if the oil flows in from above while the gear is rotating at a high speed,
An oil film is formed on the upper part of the gear, and the oil for lubrication may not reach the gear sufficiently, and the hydraulic oil is accumulated on the film and overflows from the oil supply port arranged at the upper position. There was something.

[0005]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described. That is, in claim 1,
In a transmission in which the HST for traveling speed change and the HST for steering are arranged on a transmission case, one HST
A hydraulic oil is supplied to the other HST from an oil passage provided inside the transmission case, and the hydraulic oil is returned from the other HST to the transmission case via a discharge hole. The wall of the oil passage is arranged between the gears adjacent to.

According to a second aspect of the present invention, in a transmission in which a traveling shift HST and a steering HST are arranged on a transmission case, hydraulic oil is supplied from one HST to the other HST through an oil passage provided inside the transmission case. The hydraulic oil is returned from the other HST to the transmission case via the discharge port, and an oil supply port is disposed above the transmission case above the discharge port, and a wall is provided between the supply port and the discharge port. It is provided.

According to a third aspect of the present invention, the traveling HST and the steering HST are arranged on a transmission case, and the steering HST is arranged on the transmission case.
In a transmission that transmits the output of ST to a planetary gear type steering mechanism via a bevel gear to drive an axle, a bevel gear shaft that supports the bevel gear is supported on a transmission case via a bearing holder, and a bolt that fixes the bearing holder A collar is interposed between the transmission case and the transmission case.

According to a fourth aspect of the present invention, the side of the transmission case and the body frame are connected via a connecting frame.
A reinforcing plate is interposed between the middle part of the connection frame and the transmission case, and the reinforcing plate is fixed by bolts for fixing the bearing holder.

According to a fifth aspect of the present invention, a gear-sliding type transmission is disposed in the transmission case so that the speed can be changed by sliding the slider, and a pin is projected from a shifter fork that slides the slider to engage with the slider. The fitting portion of the pin is formed in an oval shape in cross-section, and when the fitting portion is inserted into a long hole provided in the retaining plate, the retaining plate is formed of an elastic body. And biased toward the shifter fork.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. Fig. 1 is an overall side view of the combine, Fig. 2
FIG. 3 is a skeleton view of the power transmission mechanism, FIG. 4 is a rear cross-sectional view of the HST for traveling shift and the transmission case, FIG. 5 is a front cross-sectional view of the HST for steering and the transmission case, and FIG. FIG. 7 is a side sectional view of the shifter fork with the body removed, and FIG.
9 is a perspective view of the same pin, FIG. 10 is a side view below the step, FIG. 11 is a front view thereof, and FIG. 12 is a plan view thereof.

First, the overall structure of a combine equipped with a vehicle transmission according to the present invention will be described with reference to FIGS. The body frame 2 is supported on the crawler-type traveling device 1, the sorting device is disposed on the left side of the body frame 2, and the threshing unit 3 is disposed thereon, and the reaping unit 4 can be moved up and down in front of the threshing unit 3. Have been placed. Threshing unit 3
Is disposed on the right side of the vehicle, a discharge auger 6 is disposed forward from the rear of the Glen tank 5, and a control unit 7 is disposed forward of the Glen tank 5. In this manner, the grain stalks cut by the cutting unit 4 are conveyed to the rear threshing unit 3 and threshed in the threshing unit 3, and the selected kernels are
It is stored in the Glen tank 5. The grains stored in the Glen tank 5 are transported by a discharge auger 6,
It can be discharged to the bed of trucks placed on the ridge.

In the steering section 7, a seat 11 is arranged at the rear of the step 10, a steering column 12 is erected at the front of the step 1, and a round steering handle 13 is arranged on the steering column 12. The main shift lever 14 projects from the upper left side of the steering column 12, and the parking brake lever 15 projects from the right side of the step 10. A side column 16 is erected from the left side of the seat 11 and the step 10, and a work lever, an auxiliary shift lever 18 and the like are arranged. Further, a safety pedal is disposed on the left side of step 10 as operating means for returning the main transmission to neutral.

Next, the HST 60 for traveling speed change and the HS for steering are used.
The power transmission mechanism in the transmission case 17 from T90 will be described with reference to FIGS. 3, 4, and 5. FIG. First, a power transmission mechanism from the traveling speed change HST 60 to the axles 61L and 61R will be described. An output pulley 62 is fixed to an output shaft of the engine 9. The output pulley 62 and the traveling speed change HS
A V-belt 70 is wound around an input pulley 63 fixed to a pump shaft 64 of T60 so that power can be transmitted. Further, a steering HST is provided on the pump shaft 64.
An output pulley 65 for transmitting power to the HST 90 is fixed, and a V-belt 71 is wound between the output pulley 65 and an input pulley 92 fixed on a pump shaft 91 of the steering HST 90. ing. And the pump shaft 64.
Cooling fans 66 and 93 are fixedly mounted on 91, respectively.

Transmission gears 68 and 69 are loosely fitted on a motor shaft 67 which is an output shaft of the traveling transmission HST 60, and the transmission gears 68 and 69 are fixed gears fixed on the transmission shaft 81, respectively. 72 and 73 always mesh with each other. The motor shaft 67 between the transmission gears 68, 69
A slider 74 is spline-fitted thereon, and slides on the slider 74 to mesh with one of the transmission gears 68 and 69 to transmit power, thereby constituting a subtransmission mechanism.

As shown in FIGS. 4, 7, and 8, the slider 74 is fitted with pins 22 and 22 disposed at the tip of the shifter fork 21, and the shifter fork 21 is fixed to the shifter shaft 45. The shifter shaft 45 is protruded above the transmission case 17 and the shifter shaft 4
5 is connected to the auxiliary speed change lever 18 via an arm 46 fixed to the upper end via a link or the like. As shown in FIG. 9, the pin 22 includes a large-diameter portion 22a and a small-diameter portion 22b, and a slit portion 22c is formed on an upper side surface of the large-diameter portion 22a. The small diameter portion 22b is used for the shifter fork 2
1 is inserted into the insertion holes opened up and down.
And the slot part 22c is formed in a plan view oval shape,
The slot portion 22c is inserted into slots 23a provided at both ends of the retaining plate 23, and the slot portion 22c is slidable in the slot 23a. It is composed of an elastic member and is configured in a C-shape when viewed from the side.
The size of the fitting portion of the shifter fork 21 is adjusted.

In such a configuration, the retaining plate 23
When the slotted portions 22c are inserted into the long holes 23a and into the insertion holes of the shifter fork 21,
Due to the force of the retaining plate 23 trying to spread, the pin 22
The slotted portion 22c of 22 is locked and pressed against the shifter fork 21 so that it does not come off. When the shift operation is performed by operating the sub-transmission lever 18, the shifter shaft 45 is rotated via a link or the like, and the slider 7 is rotated by the rotation of the shifter fork 21.
The slider 74 slides on the motor shaft 67 and is engaged with the transmission gear 68 or the transmission gear 69 by being pushed by the slit portion 22 c fitted into the concave portion on the outer periphery of the transmission gear 4. At this time, the slit portions 22c of the upper and lower pins 22 are aligned by the long holes 23a of the retaining plate 23, that is, the retaining plate 23 moves in parallel, and the upper and lower pins 22 Are in contact with each other in opposite directions to prevent the shifter fork 74 from being twisted.

The fixed gear 72 is connected to a brake shaft 82.
The gear shaft 75 is always engaged with the gear 75 fixed above, and a brake device 76 is disposed at one end of the brake shaft 82.
A gear 77 is fixed on the brake shaft 82, and meshes with a gear 78 fixed on a counter shaft 83 rotatably supported by a bearing.
The power is transmitted by meshing with the center gear 79 fixed on the upper gear 4. At one end of the counter shaft 83, a slit or a half-moon-shaped notch 83a is formed. On the other hand, a projection is formed on the bearing portion of the counter shaft 83 of the transmission case 17 so as to fit into the notch 83a. With this configuration, the rotation of the counter shaft 83 is simultaneously formed when the transmission case 17 is formed, so that the number of parts and the number of assembly steps are reduced.

Next, the planetary gear type steering mechanism will be described. The planetary gear type steering mechanism includes a center shaft 84, sun gears 85L and 85R, planetary gears 86L and 86R, internal gears 87L and 87R with bevel gears, and a carrier 89L.
-It is composed of 89R and the like. Sun gears 85L and 85R are fixed to left and right ends of the center shaft 84,
A plurality of sets of planet gears 86L and 86R mesh with the outer periphery of the sun gears 85L and 85R, and the inner gears 87L and 87R with bevel gears mesh with the outer periphery of the planet gears 86L and 86R.

The planet gears 86L and 86R are:
Each is rotatably supported by a shaft 24 fixed to the left and right carriers 89L and 89R. The shaft 24 is fixed by penetrating the carrier 89 and the shaft 24 with a knock pin 25. However, in this state, the knock pin 25 may come off due to vibration or the like. If the knock pin 25 comes off, the shaft 24 slides and the center gear 7
9 may be cut off. Therefore, the retaining rings 26 are rotatably fitted between the center gear 79 and the carrier 89 on both sides of the center gear 79 on the center shaft 84 so that even if the knock pin 25 comes off, the shaft
Corresponds to the retaining ring 26 so as not to hit the center gear 79.

The carriers 89L and 89R are fixedly engaged with the left and right axles 61L and 61R.
A driving sprocket 57 is provided at the left and right ends of the 1L and 61R.
L · 57R, and the driving sprocket 57L · 5
The right and left crawler traveling devices 1 are driven by 7R.

A gear 95 is fixed on the motor shaft 94 of the steering HST 90. The gear 95 always meshes with a gear 97 fixed on the reduction shaft 96, and the gear 95 is stable on the reduction shaft 96. A brake mechanism 100 for creating a neutral state is provided. A gear 98 is further fixed on the reduction shaft 96, and meshes with a gear 101 on the reduction shaft 99. A bevel gear 102 is fixed to an end of the reduction shaft 99, the bevel gear 102 meshes with a bevel gear 103, the bevel gear 103 is fixed to one end of a bevel gear shaft 104, and the other end of the bevel gear shaft 104 is steered. Bevel gear 105
The steering bevel gear 105 has a bevel gear 87 formed on the outer periphery of the internal gears 87L and 87R.
It is in mesh with La · 87Ra.

In the above configuration, the shift arm 5 of the traveling HST 60 is operated by operating the main shift lever 14.
4 is rotated, the swash plate of the hydraulic pump is rotated, and the continuously variable transmission and forward / reverse switching are performed. In addition, the rotation of the steering handle 13 causes the shift arm 5 of the steering HST 90 to rotate.
5, the swash plate of the hydraulic pump is rotated, and the motor shaft is rotated forward and reverse to drive the planetary gear type steering mechanism.

That is, when the steering handle 13 is directed straight, the motor shaft 94 does not rotate in the steering HST 90 at the neutral position, and the steering bevel gear 105 interlocked with the motor shaft 94 does not rotate. The left and right internal gears 87L and 87R with bevel gears are also not rotated, and the output rotation from the traveling speed change HST 60 according to the amount of rotation of the main shift lever 14 is changed to the left and right sun gear 85L.
・ Rear left and right planetary gears 86L ・ 86R
Then, the power of the same rotational speed is transmitted to the carriers 89L and 89R and the axles 61L and 61R on the left and right sides, and the vehicle goes straight.

The steering handle 13 is used for turning.
Is rotated left or right, the transmission arm 55 of the steering HST 90 is rotated, the motor shaft 94 is driven forward or reverse, and the rotation according to the rotation angle of the steering handle 13 is performed. It is transmitted to the bevel gear 36. Then, the left and right internal gears 87L and 87R with bevel gears are forcibly rotated by the steering HST 90 in a stepless manner and left and right in the forward and reverse directions.
5, the internal gears 87L and 87R with bevel gears are rotated in the forward and reverse directions, and one of the left and right planetary gear mechanisms is transmitted with the increased speed rotation, and the other is transmitted with the reduced speed rotation. One of the rotation speeds of the gears 85L and 85R is added and the other is subtracted, and the axles 61L and 61R are subtracted.
, And the left and right axles 61L and 61R rotate at different rotational speeds.

The transmission case 17 accommodating the power transmission mechanism is filled with a working oil also serving as a lubricating oil, and the transmission case 17 has an L-shaped mounting portion formed in an upper portion in a rear view. The HST 60 for traveling shift and the HST 90 for steering are arranged side by side. The transmission case 17 is divided into left and right half cases 17L and 17R and a lid 32 by a front and rear split surface.
An oil passage 33 is formed between the oil passage 33 and the upper part of the half case 17L.
The oil passage 33 communicates with the inside of the HST case 58 of ST60.
Is connected to the HST case 59 of the steering HST 90. A filter 34 is attached to a lower side surface of the transmission case 17, and a discharge hole 35 communicating with the HST case 59 is opened in an upper portion of the half case 17 </ b> L.

Therefore, by driving a charge pump (not shown), the oil in the transmission case 17 is sucked through the filter 34, and is fed into the HST case 58 to supply hydraulic oil to the HST 60 for traveling speed change. HST
Hydraulic oil overflowing from the case 58 passes through the oil passage 33 through the HST
The hydraulic fluid is supplied to the steering HST 90 by entering the case 59. Then, the hydraulic oil overflowing from the HST case 59 is returned from the discharge hole 35 to the area without the transmission case 17.

As shown in FIG. 6, a wall 33c, which constitutes the oil passage 33, is located below the discharge hole 35 in the front-rear horizontal direction.
6 is formed, and an oil supply port 37 is provided above the wall 36. Therefore, the hydraulic oil discharged from the discharge hole 35 is blocked by the wall 33c and rotates at a high speed.
There is no direct contact with 5 and no oil film is formed to prevent the return of the lubricating oil. Further, since the wall 36 is disposed above, the working oil is not filled and flows backward from the oil supply port 37 and does not overflow from the breather to the outside of the transmission case 17.

As shown in FIGS. 5 and 6, the bevel gear shaft 104 is mounted on a bearing holder 27 such as a bearing 29 such as a bearing.
・ It is rotatably supported via 29 and the bearing holder 2
7 is a right half case 17 that constitutes the mission case 17
R and the inner surface of the left half case 17L, and the bearing holder 27 has fastening holes 27a, 27a, 27a.
Are also opened in the left and right half cases 17L, 17R in accordance with the positions of the fastening holes 27a, 27a, 27a.
Are arranged around the fastening holes located on the mating surface of the R and the bearing holder 27, respectively, for fastening the collars 30, 30 ..., the transmission case 17 and the bearing holder 27. Bolts 31, 31 and 31 are passed through the holes and fastened and fixed. By interposing the collar 30 between the bolt 31 and the transmission case 17 in this manner, the support rigidity can be obtained even if the diameter of the bolt 31 is small. The bevel gear can be arranged and fixed in the space.

Further, in the transmission case 17, the axle cases 40L and 40R extending to both sides from the lower portion of the transmission case 17 and the body frame 2 are conventionally connected and fixed by a frame or the like. Since the traveling device 1 is disposed, when working in a combine, not only the waste such as straw waste and mud is easily caught and adversely affects traveling, but also the cleaning is difficult and maintenance is difficult due to the small portion. It was hard to do.

Therefore, as shown in FIGS. 10, 11 and 12, a mounting seat 17a is provided on the right side surface of the transmission case 17, and the lower end of the connecting frame 41 is fixed to the mounting seat 17a. Is formed in an inverted L-shape when viewed from the front, extends upward and to the right, and the upper end of the connection frame 41 is fixed to the side surface of the body frame 2 that supports the step frame 20L. A reinforcing plate 42 projects from the side surface of the transmission case 17, and is fixed to an intermediate portion of the connection frame 41 to reinforce the connection frame 41.
Therefore, a space is formed between the lower surface of the step 10, the transmission case 17, and the crawler traveling device 1, so that the stay and clogging of straw waste and mud do not occur.

[0031]

The present invention is configured as described above.
The following effects are obtained. That is, in the transmission in which the HST for traveling shift and the HST for steering are arranged on the transmission case as in claim 1, hydraulic oil is supplied from one HST to the other HST via an oil passage provided inside the transmission case. The hydraulic fluid is returned from the other HST to the transmission case via a discharge hole, and the wall of the oil passage is arranged between the discharge hole and a gear adjacent to the discharge hole. The hydraulic oil discharged from the gears does not fall directly on the gears, no oil film is formed even when the gears are rotating at a high speed, and the gears in the transmission case can be reliably lubricated.

According to a second aspect of the present invention, in a transmission in which the HST for traveling speed change and the HST for steering are arranged on a transmission case, hydraulic oil is supplied from one HST to the other HST through an oil passage provided inside the transmission case. Supply,
A hydraulic oil is returned from the other HST to the transmission case via a discharge port, wherein an oil supply port is disposed above the transmission case above the discharge port, and a wall is provided between the supply port and the discharge port. Therefore, even if the hydraulic oil discharged from the discharge port bounces off the wall inside the transmission case, hits the rotating gears and bounces, or if the hydraulic oil stays in the discharge part, it is blocked by the wall and is blocked from the oil supply port. It was no longer overflowing.

According to a third aspect of the present invention, the driving shift HST and the steering HST are arranged on a transmission case, and the steering HS
In a transmission that transmits the output of T to a planetary gear type steering mechanism via a bevel gear to drive an axle, a bevel gear shaft that supports the bevel gear is supported on a transmission case via a bearing holder, and a bolt that fixes the bearing holder Since the collar is interposed between the transmission case and the transmission case, the rigidity of the support section is increased, the bolt diameter can be reduced, and the bearing holder can be supported. The volume can be increased, and interference between the bolt and other parts can be prevented.

According to a fourth aspect of the present invention, the side of the transmission case and the body frame are connected via a connection frame, and a reinforcing plate is interposed between a middle portion of the connection frame and the transmission case. Since the bearing holder was fixed by bolts, the connection frame passed through the side of the transmission case and was connected to the body frame, creating a space between the crawler-type traveling device and the transmission case to prevent clogging of straw, mud, etc. It can be eliminated, and does not adversely affect running. Further, the connecting frame is firmly connected to the transmission case by the reinforcing plate, and the reinforcing plate is fixed by the bolt for fixing the bearing holder, so that the number of fixing parts can be reduced.

According to a fifth aspect of the present invention, a gear-sliding type transmission is disposed in the transmission case so that the speed can be changed by sliding the slider, and a pin protrudes from a shifter fork that slides the slider to engage the slider. In the configuration, the fitting portion of the pin is formed in an oval shape in cross section, and when the fitting portion is inserted into a long hole provided in the retaining plate, the retaining plate is made of an elastic body. Since the pin is configured and urged to the shifter fork side, the pin is engaged with the retaining plate and urged to the shifter fork side, so that the pin does not fall off and the assembling can be facilitated. Also, since the pin is oval in cross section, it is slidably supported in the long hole of the retaining plate without changing its direction, and does not bite or squeeze with the fitting part of the shifter fork. , Shifting can be facilitated.

[Brief description of the drawings]

FIG. 1 is an overall side view of a combine provided with the present invention.

FIG. 2 is an overall plan view of the same.

FIG. 3 is a skeleton diagram of a power transmission mechanism.

FIG. 4 is a rear cross-sectional view of the traveling speed change HST and a transmission case.

FIG. 5 is a front sectional view of a steering HST and a transmission case.

FIG. 6 is a side view showing a state where a lid is removed.

FIG. 7 is a side sectional view of a shifter fork.

8 is a sectional view taken along the line XX in FIG. 7;

FIG. 9 is a perspective view of the pin.

FIG. 10 is a side view of the lower part of the step.

FIG. 11 is a front view of the same.

FIG. 12 is a plan view of the same.

[Explanation of symbols]

 17 Transmission case 30 Collar 31 Bolt 33 Oil passage 33c Wall 35 Discharge hole 36 Wall 37 Oil filler 60 HST for traveling speed change 90 HST for steering

Claims (5)

[Claims] 1. A transmission in which a hydraulic continuously variable transmission for traveling speed (hereinafter referred to as HST for traveling speed) and a hydraulic continuously variable transmission for steering (hereinafter referred to as HST for steering) are disposed on a transmission case. The hydraulic fluid is supplied from the HST to the other HST through an oil passage provided inside the transmission case, and the hydraulic fluid is returned from the other HST to the transmission case via a discharge hole. A transmission for a traveling vehicle, wherein a wall of the oil passage is disposed between gears adjacent to the hole. 2. A transmission in which a transmission shift HST and a steering HST are arranged on a transmission case, and hydraulic oil is supplied from one HST to the other HST through an oil passage provided inside the transmission case. HST
A hydraulic oil is returned to the mission case through the discharge hole from the above, wherein an oil supply port is arranged above the discharge case above the discharge hole, and a wall is provided between the supply port and the discharge hole. Transmission of the traveling vehicle to run. 3. A transmission for driving an axle by disposing an HST for traveling speed change and an HST for steering on a transmission case and transmitting an output of the HST for steering to a planetary gear type steering mechanism via a bevel gear. A transmission for a traveling vehicle, wherein a bevel gear shaft for supporting a bevel gear is supported on a transmission case via a bearing holder, and a collar is interposed between a bolt for fixing the bearing holder and the transmission case. 4. The transmission case side surface and the body frame are connected via a connection frame, and a reinforcing plate is interposed between a middle part of the connection frame and the transmission case,
4. The transmission according to claim 3, wherein the reinforcing plate is fixed by bolts for fixing the bearing holder. 5. A transmission in which a gear sliding type transmission is arranged in a transmission case so that a gear can be shifted by sliding a slider, and a pin is projected from a shifter fork which slides the slider to engage with the slider. The fitting portion of the pin is formed in an oval shape in a sectional view, and when the fitting portion is inserted into a long hole provided in the retaining plate, the retaining plate is formed of an elastic body to form a shifter fork. A transmission for a traveling vehicle, which is biased to the side.