JPH0435215Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention has a front wheel differential mechanism installed in a cover body for a differential mechanism installation hole of a front wheel transmission case with front wheels mounted on both ends so as to be steerable. The differential mechanism body is attached via a pair of field bearings distributed on both sides of the ring gear that constitutes the differential mechanism body, and the average circumferential speed of the pair of left and right front wheels is the average circumferential speed of the pair of left and right rear wheels. A front wheel transmission that can be freely switched between a standard transmission state in which the circumferential speed is the same or almost the same as the peripheral speed, and an increased speed transmission state in which the average circumferential speed of the pair of front wheels is greater than the average circumferential speed of the pair of left and right rear wheels. of,
The present invention relates to a structure of a travel transmission part in an agricultural tractor, which is detachably provided to reverse the rotational output of a travel transmission and transmit it to the front wheel differential mechanism.

[Conventional technology]

In the agricultural tractor mentioned above, the front wheel transmission transmits the output of the drive transmission to the front wheel differential mechanism by reversing its rotational direction. The direction of rotation of the rotational force transmitted from the driving transmission to the front wheel differential mechanism is reversed when no transmission is installed. However, depending on whether a front wheel transmission is installed or not, one of the pair of side gears is attached to the left front wheel transmission shaft, and the ring gear is located on one of the left and right sides of the input shaft, and one side gear is attached to the left front wheel transmission shaft. If you change the assembly position of the differential mechanism body so that the side gear is attached to the transmission shaft for the right front wheel and the ring gear is located on the other side of the input shaft, the ring gear of the differential mechanism body will be attached to the input shaft. However, by switching between the left and right sides, front wheel drive can be performed appropriately regardless of changes in the input rotation direction of the front wheel differential mechanism, and there is no need to use a special rotation direction conversion mechanism. It's over. Conventionally, when adjusting the transmission using the front wheel differential mechanism, the shape of the lid body was conventionally rotated so that the left and right and top and bottom sides were interchanged and replaced with the front wheel transmission case. Alternatively, if it is not possible to change the mounting position of the differential mechanism body as described above by changing the mounting position of the lid body relative to the front wheel transmission case due to interference between the lid body and surrounding objects, install the front wheel transmission. By creating and using two types of lids, one for use when the front wheel transmission is not installed and the other for use when the front wheel transmission is not installed, it is possible to change the assembly orientation of the differential mechanism. I was doing it.

[Problem that the invention attempts to solve]

The conventional means for adjusting power transmission using a front wheel differential mechanism is economically disadvantageous because it requires preparing two types of lids.

An object of the present invention is to enable transmission adjustment using a differential mechanism even when the mounting position of the lid cannot be changed and by simply creating one type of lid.

[Means for solving problems]

The characteristic configuration of the present invention is that in the structure of the traveling transmission part of the agricultural tractor described above, the pair of bearings are formed to have the same size, and one side gear of the pair of side gears constituting the differential mechanism main body is set to the left side. A first ring gear attached to the front wheel transmission shaft and in which the ring gear is located on one of the left and right sides of the input shaft.
The differential mechanism main body and the bearing are attached to the mounting position and the second mounting position in which one of the side gears is attached to the right front wheel transmission shaft and the ring gear is located on the other left and right side of the input shaft. The main body of the differential mechanism is removably attached so that it can be replaced between the bearing and the lid, and its functions and effects are as follows.

[Effect]

Even if the mounting position of the lid body to the front wheel transmission case is not changed, if the mounting position of the differential mechanism body to the lid body is changed to the first mounting position and the second mounting position, the ring gear will be positioned on the left side of the input shaft. and the right side, and the forward rotational power of the input shaft is transmitted in the normal direction to the wheel transmission shaft so that it rotates in the forward direction, and the reverse rotational power of the input shaft is transmitted in the reverse direction to the wheel transmission shaft so that it rotates in the forward direction. The transmission state of the front wheel differential mechanism changes between the two states.

Since the size of the pair of bearings is the same and the differential mechanism main body is attached to and detached from the lid body at the location where the bearings are arranged, each of the pair of differential mechanism mounting portions of the lid body is can be formed so that it can be used commonly at either of the pair of lid mounting locations on the differential mechanism main body.

[Effect of idea]

By being able to change the assembly state of the front wheel differential mechanism between the forward rotation transmission and the reverse rotation transmission, the front wheel differential mechanism can be installed so that the front wheels can be driven appropriately regardless of whether the front wheel changing device is installed or not. Although the transmission can be adjusted economically using a differential mechanism, there is no need to change the attachment of the lid, and each pair of differential mechanism attachment parts can be attached to a pair of attachment points of the differential mechanism body. Since it can be formed so that it can be shared, even if it is impossible to change the mounting position of the lid as mentioned above, only one type of lid needs to be created, which is also economically advantageous. It became possible.

〔Example〕

As shown in FIG. 5, a pair of left and right front wheels 1a,
1b so that it can be steered and driven, and a pair of left and right non-steering wheels 2a and 2b that can be driven, and various working devices such as a rotary tiller can be raised and lowered at the rear of the traveling body. An agricultural tractor is constructed by attaching a lift arm 3 to be connected and a power take-off shaft 4 for transmitting power to a connecting work device.

The front wheels 1a, 1b are attached to the fuselage frame 6 via a front wheel transmission case 5 which is attached to both ends so as to be freely steerable. As shown in FIG. 1, the rotation of the front wheel output gear 9 of the driving transmission 8 installed in the transmission case 7 forming the rear part of the fuselage is controlled by the front wheel transmission 10 and the rotating shaft 11. The signal is configured to be transmitted to the front wheel differential mechanism 12 built into the left and right intermediate portions of the front wheel transmission case 5 through the front wheel transmission case 5, thereby making it possible to drive the front wheels 1a and 1b.

The front wheel transmission 10 is constructed as shown in FIG.

That is, the input gear 1 is connected to the front wheel output gear 9.
3 and a standard transmission gear 15 interlocked via the first intermediate gear 14; and a standard transmission gear 15 interlocked via the first intermediate gear 14; Each of the speed increasing transmission gears 18 interlocked via the second intermediate gear 17 is attached to the output shaft 19 so as to be relatively freely connected, and
A speed change member 21 which also serves as a transmission member is attached to the output shaft 19 via a sleeve 20 so as to be rotatable and slidable together. A dog clutch 22 is provided between the speed change member 21 and the standard transmission gear 15, and a multi-plate friction clutch 23 is provided between the speed change member 21 and the speed increasing transmission gear 18.
As the transmission member 21 is oscillated by the oscillating shifter 24, the friction clutch 23 and the engagement clutch 22 are selectively engaged. That is, when the articulating clutch 22 is engaged, the standard transmission gear 15 and the output shaft 19 are interlocked so as to rotate together, the rotational output of the traveling transmission 8 is reversed, and the left and right front wheels 1
A standard transmission state is established in which the speed is controlled so that the average circumferential speed of the left and right rear wheels 2a and 1b is the same or almost the same as the average circumferential speed of the left and right rear wheels 2a and 2b, and the transmission is transmitted to the front wheel differential mechanism 12. 23 is engaged, the speed-increasing transmission gear 18 and the output shaft 19 are interlocked so as to rotate together, reversing the rotational output of the driving transmission 8, and rotating the left and right front wheels 1.
The standard transmission state is such that the average circumferential speed of the wheels a and 1b is greater than the average circumferential speed of the left and right rear wheels 2a and 2b, and the speed is transmitted to the front wheel differential mechanism 12.

As shown in FIG. 4, a hydraulic cylinder 26 is connected to the rotary operation shaft 25 of the shifter 24, and the front wheel transmission 10 is switched by expanding and contracting the hydraulic cylinder 26 by switching the electromagnetic control valve 27. configured to operate. and a steering detection switch 29 that detects steering of the front wheels 1a, 1b to the left or right side beyond a set angle based on the swing angle of the pit unarm 28;
a first speed detection switch 30 that detects that a four-speed switchable main transmission section (not shown) of the traveling transmission 8 is in the fourth forward speed;
and a second speed detection switch 31 that detects that a sub-transmission section (not shown) capable of switching between four stages of the traveling transmission 8 is in the fourth speed state.
are linked to the control valve 27 so as to automatically switch between the two. wheel 1
When the steering angles a and 1b are operated to exceed the set angle, the front wheel drive speed is automatically switched to a higher speed than when the steering angle is less than the set value, so that small turns can be made.
In addition, when driving at high speed with both the main transmission section and the auxiliary transmission section set to 4th gear, front wheel drive is disabled for safety reasons, regardless of whether the front wheels 1a, 1b are steered to a set angle or higher. The speed is maintained the same or nearly the same as the rear wheel drive speed. That is, when at least one of the first speed detection switch 30 and the second speed detection switch 31 is in the non-detection state, the first speed detection switch 30 or the second speed detection switch 31 that is in the non-detection state is turned on. -ing In this case, when the steering detection switch 29 is in the non-detection state, since the detection switch 29 is in the OFF state, the control valve 27 is automatically set to the position S where the front wheel transmission 10 is operated to the standard transmission state. When the steering detection switch 29 enters the detection state, the detection switch 29 is turned on, and the front wheel transmission 10 is controlled to position H, which operates the front wheel transmission 10 to the speed-up transmission state. The valve 27 is automatically switched. And the first
When both the speed detection switch 30 and the second speed detection switch 31 are in the detection state, both detection switches 30 and 31 are in the OFF state, so even if the steering angle detection switch 29 is in the detection state, Even when the front wheel transmission 10 is shifted to the forward position, the control valve 27 is kept at the position S where the front wheel transmission 10 is operated in the standard transmission state due to its self-biasing force.

The input gear 13 is attached to the transmission shaft 32 through a bearing 33 so that the transmission shaft 32 relative to the power output shaft 4 can be used as a support shaft and can be detached and rotated relative to the transmission shaft 32 so as to be detachable. be. The rotating shaft 16, output shaft 19, etc. are detachably attached to the transmission case 7 via the transmission case 34 so that they can be removed integrally with the transmission case 34,
The front wheel transmission 10 can be removed.

As shown in FIG. 2, a power extraction device 35 is provided for extracting the rotational force of the front wheel output gear 9 from the transmission case 7 instead of the front wheel transmission 10 when the front wheel transmission 10 is not installed. It is configured.

That is, the input gear 36 is replaced by the input gear 13 and is relatively rotatably attached to the transmission shaft 32 in a state in which it engages with the front wheel output gear 9, and the clutch gear 3 is capable of engaging and disengaging the input gear 36.
7, and a gear case 39 having an output shaft 38 is replaced with the transmission case 34 and attached to the transmission case 7, and the output shaft 38 is connected to the front wheel differential mechanism 12 by using a rotating shaft 40. It is designed to be connected. In other words, the rotational output of the driving transmission 8 is directly transmitted to the front wheel differential mechanism 12 in the rotational direction.

The direction of rotation of the rotational force transmitted to the front wheel differential mechanism 12 is opposite when the front wheel transmission 10 is installed and when it is not installed, but this can be changed by adjusting the assembly of the front wheel differential mechanism 12. The front wheel differential mechanism 12 is constructed as shown in FIG. 1 so that front wheel drive is properly performed regardless of changes in the transmission rotation direction.

That is, the input shaft 41 is inserted through a removable lid 43 for the differential mechanism assembly hole 42 of the front wheel transmission case 5, and a ring gear 44 is engaged with the drive pinion gear portion 41a of the input shaft 41.
A differential mechanism main body 4 consisting of a differential gear case 45, a pair of pinion gears 46a, 46b, a pair of left and right side gears 47a, 47b, etc.
8 is attached to the pair of attachment parts 50, 51 of the lid body 43 so as to be rotatable via a pair of bearings 49a, 49b distributed on both sides of the drive pinion gear part 41a and ring gear 44. There is. Between one of the bearings 49a and the mounting portion 50, and the other bearing 49a
The differential mechanism main body 48 can be removed from the lid body 43 between the mounting portion 51 and the mounting portion 51, and the bearings to be attached to the pair of mounting portions 50 and 51 are one bearing 49a and the other bearing 4.
9b, a pair of attachment parts 5
0 and 51 are fixed to the lid body 43 by integral casting as shown in FIG.
and a removable member 50b or 51b configured to be tightened and connected to the fixed member 50a or 51a with a pair of bolts 52, 52, and a pair of bearings 49a, 49b.
are formed to have the same outer diameter size.

That is, the differential mechanism main body 48 is attached to the lid body 43 between the pair of bearings 49a, 49b and the fixed side members 50a, 51a in the first mounting position shown in FIG. 1 and the second mounting position shown in FIG. In the first mounting position, one of the side gears 47a is rotatably attached to the left front wheel transmission shaft 53 by spline engagement, and the ring gear 44 is attached to the input shaft 41. It is located on the left side and engages with the drive pinion gear portion 41a. In the second mounting position, one of the side gears 47a is rotatably attached to the right front wheel transmission shaft 54 through spline engagement, and the ring gear 44 is located on the right side of the input shaft 41 to connect the drive pinion. It engages with the gear portion 41a.

The shim 55 and the adjusting screw ring 56 which also serves as a stopper shown in FIGS. 1 and 2 are attached to the side gear 4.
This is for adjusting the assembly position of the differential mechanism main body 48 in the direction of the rotational axis 7a.

[Another example]

The first mounting posture and the second mounting posture of the differential mechanism main body 48 are replaced by the differential mechanism main body 48.
The pair of bearings 49a, 49b may be formed to have the same inner diameter size, as in the case of the pair of bearings 49a, 49b. Furthermore, the differential mechanism main body 48 and the bearing 4
Between 9a and 49b and bearings 49a and 49b
The pair of bearings 49a and 49b may be formed to have the same outer diameter and the same inner diameter size, so that the bearings 49a and 49b may be formed to have the same outer diameter and the same inner diameter.

[Brief explanation of drawings]

The drawings show an embodiment of the structure of the driving transmission part of an agricultural tractor according to the present invention, FIG. 1 is a sectional view of a front wheel differential mechanism and a front wheel transmission, and FIG. 2 is a front wheel differential mechanism and power extraction. FIG. 3 is a sectional view of the device, FIG. 3 is a perspective view of the lid, FIG. 4 is a control system diagram of the front wheel transmission, and FIG. 5 is a partially cutaway side view of the entire agricultural tractor. 1a, 1b...front wheel, 2a, 2b...rear wheel, 5...front wheel transmission case, 8...driving transmission, 10...front wheel transmission, 12
... Front wheel differential mechanism, 41 ... Input shaft, 42 ...
Differential mechanism assembly hole, 43...lid, 44...ring gear, 47a, 47b...side gear, 48...
... Differential mechanism main body, 49a, 49b ... Bearings, 53 ... Transmission shaft for left front wheel, 54 ... Transmission shaft for right front wheel.

Claims (1)

[Scope of utility model registration request] A ring gear constituting the differential mechanism main body 48 of the front wheel differential mechanism 12 is attached to the cover body 43 for the differential mechanism installation hole 42 of the front wheel transmission case 5, which has front wheels 1a and 1b attached to both ends so as to be freely steerable. A pair of bearings 49a, 49 distributed on both sides of 44
a standard transmission state in which the differential mechanism main body 48 is attached via b, and the average circumferential speed of the pair of left and right front wheels 1a, 1b is the same or almost the same as the average circumferential speed of the pair of left and right rear wheels 2a, 2b; The average peripheral speed of the pair of front wheels 1a, 1b is determined by the pair of left and right rear wheels 2.
A front wheel transmission 10, which can be freely switched to an increased speed transmission state in which the speed is higher than the average circumferential speed of the wheels a and 2b, reverses the rotational output of the driving transmission 8 and transmits it to the front wheel differential mechanism 12. This is a structure of a traveling transmission part in an agricultural tractor that is detachably installed in a state in which the pair of bearings 49a, 4
9b are formed to have the same size, and a pair of side gears 47a, which constitute the differential mechanism main body 48,
47b, one of the side gears 47a is attached to the left front wheel transmission shaft 53, and the ring gear 44 is located on one of the left and right sides of the input shaft 41, and one of the side gears 47a is attached to the right front wheel transmission shaft. The differential mechanism body 48 and the bearing 4 are attached to the shaft 54 and in a second mounting position in which the ring gear 44 is located on the other left and right sides of the input shaft 41.
9a, 49b or the bearing 49
A structure of a driving transmission part of an agricultural tractor in which the differential mechanism main body 48 is removably attached in a state where it can be replaced between a, 49b and the lid 43.