JP2001010528A - Power transmission mechanism for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the strength of a bearing supporting part by constituting the portion of a planetary gear type steering mechanism for concentrating driving force of a travel shifting purpose HST type transmission and a steering operation purpose HST type transmission by an internal with a bevel gear, in a power transmission mechanism for a vehicle juxtaposed with transmission and travel mechanisms in a travel vehicle such as constructional and agricultural machinery. SOLUTION: In constitution for constituting travel shifting and steering operating systems by a travel shifting purpose HST type transmission A and steering operation purpose HST type transmission B respectively, to join driving force from both the systems in a planet gear type steering mechanism arranged in the periphery of an axle, power is transmitted, by a steering bevel gear 36 provided on a bevel gear shaft 19 and internals 9R and 9L with a bevel gear provided in a planet gear type steering mechanism, into a portion inputted into the planet gear type steering mechanism from the device B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission mechanism for a traveling vehicle, such as a construction machine or an agricultural machine, having a speed change mechanism and a steering mechanism.

[0002]

2. Description of the Related Art Conventionally, an HST transmission having a transmission mechanism and a steering mechanism in one transmission case, transmitting power to all of the transmission by a flat gear, and inputting the power to the transmission mechanism,
It is well known that an HST type transmission for operating the steering mechanism is provided outside the same transmission case.

[0003]

However, in the conventional power transmission mechanism for a vehicle, a transmission mechanism and a mechanism for steering are provided inside a transmission case, and two sets of HSTs are provided outside the transmission case. Since the transmission is provided with a transmission, rattling occurs in the bearing portion inside the transmission case, and outside the transmission case, the operating oil of the two sets of HST transmissions becomes high temperature, and a sufficient stepless transmission is performed. However, there is a problem that the lubrication inside the transmission case becomes insufficient due to the failure of the operation or the rise in the temperature of the hydraulic oil. The present invention solves the above-mentioned disadvantages of the prior art.

[0004]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described. In the first aspect, a traveling speed change system is constituted by the traveling speed HST type transmission A, and the steering operation HS is performed.
In a configuration in which the T-type transmission B forms a steering operation system and driving forces from both are combined by a planetary gear-type steering mechanism disposed around the axles 1L and 1R, a steering operation H
The input from the ST type transmission B to the planetary gear type steering mechanism includes a steering bevel gear 3 provided on a bevel gear shaft 19.
6 and internal 9L / 9R with bevel gears provided in the planetary gear type steering mechanism. Claim 2
In the power transmission mechanism for a vehicle according to claim 1, the internal cases 9L and 9R with bevel gears constituting the planetary gear type steering mechanism are provided with bearings 55 on the outer periphery, and the transmission case M is used as an outer peripheral bearing support mechanism. It is supported inside. In claim 3, the H for traveling speed change is provided.
An ST-type transmission A constitutes a traveling transmission system, and a steering operation HST-type transmission B constitutes a steering operation system,
In a power transmission mechanism for a vehicle in which driving forces from both are joined by a planetary gear type steering mechanism disposed around axles 1L and 1R, a transmission case M is an L-shaped right half case 61 having a stepped portion. The right half case 61, which is composed of a low-position half case 62 configured to be low and to which the HST transmission A for traveling speed change and the HST transmission B for steering operation are attached, is provided with a lid 60. HST transmission A for traveling and HST transmission B for steering operation
The hydraulic motor shafts 11 and 16 have a double-sided bearing support structure by a right half case 61 and a lid 60, respectively. According to a fourth aspect of the present invention, a traveling transmission system is constituted by the traveling transmission HST type transmission A, and the steering operation H
In the power transmission mechanism of the vehicle, a steering operation system is configured by the ST-type transmission B, and driving forces from both are combined by a planetary gear-type steering mechanism disposed around the axles 1L and 1R. HST transmission A and HST for steering operation
The transmission B is attached to the same side of the transmission case M. One of the HST transmissions is a set in which a hydraulic pump and a hydraulic motor are positioned vertically, and the other HST transmission is It is arranged as a set in which a pump and a hydraulic motor are arranged. In claim 5, a traveling transmission system is constituted by the HST transmission A for traveling transmission, and a steering operation system is constituted by the HST transmission B for steering operation, and the driving force from both is transmitted to the axle 1L. 1R
In a power transmission mechanism of a vehicle that is joined by a planetary gear type steering mechanism disposed around the vehicle, an HST type transmission A for traveling speed change and an HST type transmission B for steering operation are mounted on the same side of the transmission case M. Cooling fans FA and FB are attached to hydraulic pump shafts 14 and 15 that are provided and protrude to the same side to cool hydraulic oil.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The means for solving the present invention are as described above, and the embodiments of the present invention will be described next.
FIG. 1 is a skeleton diagram illustrating an overall power transmission system of a power transmission mechanism of a vehicle, FIG. 2 is a diagram illustrating the skeleton diagram of FIG. 1 in more detail by gears and shafts, and FIG. Sectional view of the transmission case M on the line of the power transmission shaft from the transmission HST type transmission A to the axles 1L and 1R. FIG.
FIG. 5 is a cross-sectional view of the transmission case M on the line of the power transmission shaft leading to L · 1R, FIG. 5 is a side view of the transmission case M showing a configuration of the vehicle power transmission mechanism, and FIG. 6 is a vehicle power transmission mechanism of the present invention. 1 is an overall side view of a combine equipped with a.

First, referring to FIG. 6, description will be given of a case where a transmission case M constituting a power transmission mechanism of a vehicle according to the present invention is mounted on a combine. In this embodiment, the drive sprocket 47L of the crawler type traveling device 2
47R is driven by axles 1L and 1R protruding left and right from the transmission case M. The drive sprockets 47L and 47R are arranged at the front end of the crawler type traveling device 2, and the axles 1L and 1R that drive the drive sprockets 47L and 47R are also located at the front end of the crawler type traveling device 2 in the transmission case M. Are located. And
At the rear of the transmission case M, the crawler traveling device 2
The engine E is located at the front position of 0. As shown in FIG. 1, power is transmitted from the engine E to the transmission case M by a pulley and a V-belt. At the rear of the engine E, a combine threshing device K is arranged, and at the front of the transmission case M, a reaper N is arranged.

1 and 2, a description will be given of a power transmission system from the HST type transmission A for traveling speed change to the axles 1L and 1R. An output pulley 22 is fixed to the output shaft of the engine E. A V-belt 70 is wound around the output pulley 22, and the other end of the V-belt 70 is connected to a traveling speed HS.
It is wound around an input pulley 23 fixed to the hydraulic pump shaft 14 of the T-type transmission A. Further, the hydraulic pump shaft 1
An output pulley 24 for transmitting power to the HST transmission B for steering operation is fixed on the output pulley 4, and a V-belt 71 is wound around the output pulley 24. It is input to the hydraulic pump shaft 15 of the HST transmission B for steering operation. A cooling fan FA is fixed to an end of the hydraulic pump shaft 14, and a cooling fan FB is fixed to an end of the hydraulic pump shaft 15.
And the cooling fan FB cools the hydraulic oil of the HST transmission A for traveling speed change and the HST transmission B for steering operation.

The transmission gear 26 and the transmission gear 27 are loosely fitted on the hydraulic motor shaft 11 which is the output shaft of the HST transmission A for traveling speed change. The transmission gear 26
The fixed gears 28 and 30 which always mesh with the first transmission shaft 1
2 is fixed on. On the first transmission shaft 12, another fixed gear 29 includes a fixed gear 28 and a fixed gear 30.
Is fixed between. The fixed gear 29 meshes with a loosely fitted gear 33 on the second transmission shaft 13. Also, the first
A fixed gear 28 on the speed change shaft 12 meshes with a loose fitting gear 32 on the second speed change shaft 13. The following three gear stages are obtained by the combination of the above gear trains. In the case of the traveling speed, from the transmission gear 26 through the fixed gear 28,
This is a speed stage when the loose fitting gear 32 drives the second speed change shaft 13. In the case of the standard speed, the fixed gear 28 is transferred from the transmission gear 27 through the fixed gear 30 and then to the first transmission shaft 12.
This is a gear stage when the second transmission shaft 13 is driven from the fixed gear 28 via the loose fitting gear 32. In the case of a low speed, from the transmission gear 27 via the fixed gear 30 to the fixed gear 29 from the first transmission shaft 12, the loose fitting gear 33 on the second transmission shaft 13 is moved from the fixed gear 29. It is a driving system.

At a portion where the end of the second speed change shaft 13 protrudes from the transmission case M, a traveling brake mechanism 21 which is also used as a parking brake is provided. Further, the fixed gear 31 on the second transmission shaft 13 meshes with the fixed gear 34 on the counter shaft 20, and the fixed gear 34 on the counter shaft 20 moves from the center on the center shaft 53 to the center. Gear 35
Has been entered.

Next, a planetary gear type steering mechanism constituting a main part of the present invention will be described. The planetary gear type steering mechanism includes a center shaft 53, sun gears 7L and 7R, and a planetary gear 8
L / 8R, internal 9L / 9R with bevel gears, and bearing rotors 6L / 6R. Sun gears 7L and 7R are fixed to left and right ends of the center shaft 53. A plurality of sets of planetary gears 8L and 8R are meshed with the outer periphery of the sun gears 7L and 7R. The outer peripheries of the planetary gears 8L and 8R are meshed with internal bevel gears 9L and 9R.

The planetary gears 8L and 8R are respectively supported by left and right bearing rotors 6L and 6R, and the bearing rotors 6L and 6R are connected to the left and right axles 1L and 1R.
The engagement is fixed to R. Drive sprockets 47L and 47R are provided at left and right ends of the axles 1L and 1R, respectively, and drive the left and right crawler traveling devices 2.

In the above-described configuration, switching between forward and backward traveling speeds is performed by the HST type transmission A for traveling speed change. In addition, the continuously variable transmission in a region where the traveling speed is changed is also performed by the HST transmission A for traveling speed change. The stepwise “running shift”, “standard shift”, and “low speed shift” are performed by an auxiliary speed change mechanism configured between the hydraulic motor shaft 11 and the first speed change shaft 12. Further, since the swash plate of the hydraulic pump shaft of the HST type transmission A for traveling speed change is configured to be operated by the swash plate operation shaft 5 shown in FIG. 5, the swash plate operation shaft 5 is operated. That is, switching between forward and backward movement and stepless speed change are performed.

When the HST transmission B for steering operation described below is not rotating at the neutral position, the steering bevel gear 36 does not rotate, so that the left and right internal bevel gears 9L and 9R are not rotated. It is impossible to rotate, the left and right sun gears 7L and 7R and the planetary gears 8L
8R, the bearing rotors 6L and 6R, and the axles 1L and 1R make the same movement and rotation, and go straight.

Next, a description will be given of a left-right steering mechanism from the steering operation HST type transmission B. The HST-type transmission B for steering operation needs a stable stop state in a neutral state where neither forward nor reverse rotation is performed when the body goes straight. For this purpose, the urging brake mechanism which creates a stable neutral state of the steering HST transmission B is provided by the hydraulic motor shaft 16 of the steering HST transmission B.
And the first deceleration shaft 17. The urging brake mechanism alternately sandwiches both friction disks, a friction disk 45 that rotates while meshing with the reduction gear 42 on the side of the hydraulic motor shaft 16 and a friction disk 46 that rotates with the first reduction shaft 17. The outer side is biased and pressed by a biasing spring 43. The urging brake mechanism is configured to always urge. The speed is reduced between the reduction gears 42 and 41 between the hydraulic motor shaft 16 and the first reduction shaft 17. Next, the speed is reduced between the reduction gears 40 and 39 also between the first reduction shaft 17 and the second reduction shaft 18.

A bevel gear 38 is fixed to the end of the second reduction shaft 18, and the bevel gear 38 is
7 is engaged. The reduction bevel gear 37 drives the steering bevel gear 36 via the bevel gear shaft 19.
As described above, when the forward or reverse rotation of the steering operation HST transmission B is transmitted to the steering bevel gear 36, the left and right internal bevel gears 9L and 9R are forcibly operated. Since the HST-type transmission B rotates in a stepless and forward / reverse manner, the HST-type transmission B for steering operation is used.
By operating the swash plate operation shaft 4 shown in FIG. 5, the internal 9L / 9R with bevel gears is steplessly rotated forward and backward in a stepless manner to transmit left and right steering rotations to the axles 1L and 1R. It becomes.

The power transmission mechanism from the HST transmission A for traveling speed change and the power transmission mechanism from the HST transmission B for steering operation having the above-described configuration are provided in the transmission case M.
It is configured inside. And mission case M
An HST transmission A for traveling speed change and an HST transmission B for steering operation are attached above and outside of the vehicle. The transmission case M includes a right half case 61 having an L-shaped cross section and a stepped portion, and an HST
In order to dispose the transmission A and the HST transmission B for steering operation, a low-position half case 62 configured to be low is joined. The lower half where the right half case 61 and the low position half case 62 are joined together has an axle 1
The axle cases 3L and 3R housing the L.1R protrude. A case for the steering brake 21 is attached to the left side surface of the low-position half case 62. Also, on the right side of the right half case 61, there is an HST for traveling speed change.
An opening is provided on the other side of the portion where the transmission A and the HST transmission B for steering operation are attached, and a lid 60 is provided in the opening.
Is coated.

As shown in FIGS. 3 and 4, an HST type transmission A for traveling speed change is provided on the same side surface of the right half case 61.
And an HST-type transmission B for steering operation. The right half case 61 is formed in an L-shape.
Since the stepped portion is configured, the stepped portion is used to provide an arrangement space for the HST-type transmission A for traveling speed change and the HST-type transmission B for steering operation. Also, the hydraulic motor shaft 11 coming out of the HST type transmission A for traveling speed change.
The bearing 68 at one end is the right half case 6
One side is supported, and the other side bearing 69 is supported by the lid 60. Similarly, HST type transmission B for steering operation
The bearing 66 at one end of the hydraulic motor shaft 16 is supported by the right half case 61, and the bearing 67 on the other side is configured to be supported by the lid 60. That is, the hydraulic pump shaft 14 and the hydraulic motor shaft 16 are both supported by both the bearing in the right half case 61 and the bearing in the lid 60.

Also, as shown in FIG.
In order to input the rotation from the transmission B to the internal 9L / 9R with left and right bevel gears, the reduction bevel gear 37 is used.
The bevel gear shaft 19 and the steering bevel gear 36 are interposed, so that the bevel gear shaft 19 can be easily supported, and the bevel gear shaft 19 can be firmly supported by the bearing, so that the steering can be performed under a load. When performing operations,
Although a large load is applied to the portion of the bevel gear shaft 19, the support of the bevel gear shaft 19 can be made strong even by this excessive load. Also,
Since the bevel gear shaft 19 and the steering bevel gear 36 are configured to input to the left and right internal 9L / 9R with bevel gears, the conventional flat gears constitute the outer gear of the internal gear. Since the spur gear is no longer necessary, this internal 9L with bevel gear
Since the outer periphery of the 9R could be supported by the bearings 55L and 55R, the bearing configuration of the internal gear became strong and simple.

As shown in FIGS. 3, 4 and 5, a traveling transmission system is constituted by an HST transmission A for traveling transmission, and a steering operation system is constituted by an HST transmission B for steering operation. And the driving force from both is axle 1L
In a power transmission mechanism of a vehicle that is joined by a planetary gear type steering mechanism disposed around R, the HST type transmission A for traveling speed change and the HST type transmission B for steering operation are connected to the same side of the transmission case M. One HST type transmission is arranged as a set in which a hydraulic pump and a hydraulic motor are positioned in the vertical direction, and the other HST type transmission is arranged as a set in which a hydraulic pump and a hydraulic motor are arranged in the left and right direction. is there. The HST transmission A for traveling speed change has an axial type hydraulic pump and a hydraulic motor arranged in parallel to form one set, and the HST transmission B for steering operation has the same configuration. This set is attached to the side surface of the step portion of the right half case 61 constituting the transmission case M, with one set in the vertical direction and the other set in the horizontal direction.

A transmission case HST type transmission A and a steering operation HST type transmission B are connected to a transmission case M
Hydraulic pump shaft 14 attached to the same side of the
And 15 are provided with cooling fans FA and FB to cool the hydraulic oil. The cooling fan FA and the cooling fan FB
Means that they rotate on the same side and rotate on almost the same plane. The cooling fans FA and FB are used to avoid an increase in the temperature of the working oil that also serves as the lubricating oil inside the transmission case M.

[0021]

The present invention is configured as described above and has the following effects. As described in claim 1, a traveling transmission system is constituted by the HST transmission A for traveling transmission, and a steering operation system is constituted by the HST transmission B for steering operation, and the driving force from both is transmitted to the axle 1L. In a configuration in which the planetary gear-type steering mechanism arranged around the 1R joins, a portion provided from the steering operation HST type transmission B to the planetary gear-type steering mechanism is provided on a bevel gear shaft 19. Since it was performed by the bevel gear 36 and the internal 9L / 9R with bevel gear provided in the planetary gear type steering mechanism, in the steering power transmission structure using the conventional flat gear, the shaft and the gear were overloaded by overload. It was possible to eliminate the point where backlash was generated in the support portion of. Further, by reducing the speed by the bevel gear, the speed can be greatly reduced with a simple configuration even in the case of the spur gear, so that the transmission case M can be reduced in size and a simple bearing support structure can be achieved.

The internal 9L / 9R with bevel gears constituting the planetary gear type steering mechanism is supported in the transmission case M as an outer peripheral bearing support mechanism having an outer peripheral bearing 55. Although the internal gear could not be supported on the outer periphery with the conventional power transmission configuration using the spur gear, the power transmission by the bevel gear eliminated the spur gear on the outer periphery of the internal gear. In this way, the bearings can be arranged on the internal gear, and the internal gears can be firmly supported.

[0023] According to a third aspect of the present invention, a traveling speed change system is constituted by the traveling speed HST type transmission A, and the steering operation HST type transmission A is provided.
A power transmission mechanism of a vehicle in which a steering operation system is configured by the transmission B, and driving forces from both are combined by a planetary gear steering mechanism disposed around the axles 1L and 1R,
The transmission case M is composed of an L-shaped right half case 61 having a step and a low position half case 62 having a low position.
The opposite side of the right half case 61 to which the ST-type transmission B is attached is closed by a lid 60, and the hydraulic motor shafts 11 of the HST-type transmission A for traveling speed change and the HST-type transmission B for steering operation are closed. 16 has a double-sided bearing support configuration by a right half case 61 and a lid body 60, respectively, as compared with the case where the hydraulic motor shaft is cantilevered to the right half case as in the prior art. It could have been a solid support. In the case of disassembly and repair, HS
Since the T-type transmission can be inspected and repaired by removing the lid 60 while being supported by the right half case 61,
It has become easier.

In accordance with a fourth aspect of the present invention, a traveling transmission system is constituted by the traveling transmission HST type transmission A,
A power transmission mechanism of a vehicle in which a steering operation system is configured by the transmission B, and driving forces from both are combined by a planetary gear steering mechanism disposed around the axles 1L and 1R,
The HST transmission A for traveling speed change and the HST transmission B for steering operation are provided on the same side of the transmission case M,
One HST-type transmission is arranged as a set in which a hydraulic pump and a hydraulic motor are positioned in the vertical direction, and the other HST-type transmission is arranged as a set in which a hydraulic pump and a hydraulic motor are arranged in the left-right direction. By effectively utilizing the side surface of the vehicle, both the HST transmission A for traveling speed change and the HST transmission B for steering operation can be arranged. HST transmission A to steering H
The transmission can be made to the ST-type transmission B.

According to a fifth aspect of the present invention, the HST transmission A for traveling speed change and the HST transmission B for steering operation are provided on the same side of the transmission case M, and the hydraulic pump shaft 14. The cooling oil is attached to the cooling fan FA and FB to cool the hydraulic oil. Therefore, when the hydraulic oil is also used as the lubricating oil for the transmission case M, the cooling of the hot operating oil is reliably performed by both fans. Now you can do it.

[Brief description of the drawings]

FIG. 1 is a skeleton diagram illustrating an overall power transmission system of a power transmission mechanism of a vehicle.

FIG. 2 is a diagram showing the skeleton diagram of FIG. 1 in more detail by drawings of gears and shafts.

FIG. 3 shows an HST type transmission A for traveling speed change, an axle 1L
-It is sectional drawing of the transmission case M on the line of the power transmission shaft leading to 1R.

FIG. 4 shows an HST type transmission B for steering operation from an axle 1L
It is sectional drawing of the transmission case M on the line of the power transmission shaft leading to 1R.

FIG. 5 is a side view of a transmission case M showing a configuration of a power transmission mechanism of the vehicle.

FIG. 6 is an overall side view of a combine equipped with a vehicle power transmission mechanism of the present invention.

[Explanation of symbols]

 A HST transmission for traveling speed change B HST transmission for steering operation M Transmission case FA ・ FB Cooling fan 1L ・ 1R Axle 2 Crawler type traveling device 3 Axle case 4.5 4.5 Swash plate operation shaft 6L ・ 6R Bearing rotor 7L・ 7R sun gear 8L ・ 8R planetary gear 9L ・ 9R internal with bevel gear 19 bevel gear shaft 35 center gear 36 steering bevel gear

 ──────────────────────────────────────────────────の Continued on the front page (72) Shoichi Sato, Inventor 428 Enami, Okayama City In-house (72) Inventor Naoya Ikeda 428 Enami, Okayama City In-house F-term (Reference) 3D052 AA16 AA17 AA19 BB08 BB11 DD01 DD03 EE01 FF01 FF02 GG04 HH01 HH02 JJ00 JJ01 JJ10 JJ21 JJ31

Claims (5)

[Claims] 1. A traveling transmission system is constituted by an HST transmission A for traveling transmission, and a steering operation system is constituted by an HST transmission B for steering operation, and driving forces from both are transmitted to axles 1L and 1R. HST-type transmission B for steering operation in a configuration where they are joined by a planetary gear type steering mechanism disposed around
The input to the planetary gear steering mechanism includes a steering bevel gear 36 provided on the bevel gear shaft 19 and an internal 9L / 9 with bevel gear provided on the planetary gear steering mechanism.
A power transmission mechanism for a vehicle, wherein the power transmission mechanism is performed by R. 2. The power transmission mechanism according to claim 1, wherein
A power transmission mechanism for a vehicle, wherein the internal 9L / 9R with bevel gears constituting a planetary gear type steering mechanism is supported in a transmission case M as an outer peripheral bearing support mechanism having a bearing 55 on the outer periphery. . 3. A traveling transmission system is constituted by the HST transmission A for traveling transmission, and a steering operation system is constituted by the HST transmission B for steering operation, and driving forces from both are transmitted to the axles 1L and 1R. In a power transmission mechanism of a vehicle which is joined by a planetary gear type steering mechanism disposed around the vehicle, a right half case 61 having an L-shaped transmission case and a stepped portion, and a low position half case 62 formed low. The right half case 61 on which the HST transmission A for traveling speed change and the HST transmission B for steering operation are mounted is provided with a cover 6.
0, the hydraulic motor shafts 11 and 16 of the HST transmission A for traveling speed change and the HST transmission B for steering operation are closed.
The power transmission mechanism for a vehicle is characterized in that the right half case 61 and the lid 60 are used to support both ends of the bearing. 4. A traveling transmission system is constituted by an HST transmission A for traveling transmission, and a steering operation system is constituted by an HST transmission B for steering operation, and driving forces from both are transmitted to the axles 1L and 1R. Power transmission mechanism of a vehicle that is joined by a planetary gear steering mechanism disposed around
A T-type transmission A and a steering operation HST-type transmission B,
Attached to the same side of the transmission case M, one HST-type transmission is a set in which a hydraulic pump and a hydraulic motor are positioned vertically, and the other HST-type transmission has a hydraulic pump and a hydraulic motor disposed in the left-right direction. A power transmission mechanism for a vehicle, wherein the power transmission mechanism is arranged as a set. 5. A traveling transmission system is constituted by the traveling transmission HST transmission A, and a steering operation system is constituted by the steering HST transmission B, and the driving force from both is transmitted to the axles 1L and 1R. Power transmission mechanism of a vehicle that is joined by a planetary gear steering mechanism disposed around
A T-type transmission A and a steering operation HST-type transmission B,
A power transmission mechanism for a vehicle, wherein cooling oil is attached to hydraulic pump shafts (14, 15) provided on the same side of the transmission case (M) and projecting to the same side to cool hydraulic oil.