JPH0542905Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a vehicle body lifting/lowering operation lever structure for a vehicle whose vehicle height can be changed.

(b) Conventional technology Conventionally, vehicles such as agricultural tractors such as Yanmar diesel tractor FX215M, FX235M,
Some vehicles, such as the FX265M model, have a configuration that allows the vehicle height to be changed. Taking the front wheels as an example, an intermediate shaft parallel to the front axle is provided, and the intermediate shaft and the front axle are connected to each other, with the intermediate shaft being the center. It is supported by an integral axle case that can be rotated and fixed, and by changing the fixing position of the case, the height of the front part of the vehicle body can be changed. A meshing gear is provided to transmit power to the front wheels.

This configuration is also applied to the rear axle, making it possible to change the vehicle height while transmitting power to the axle.

In other words, to change the front of the vehicle from a low vehicle height to a high vehicle height, brake the rear wheels, release the fixation of the front axle case, and transmit driving force to the front wheels. Since the front wheel gear case rotates against the weight of the vehicle due to the ground propulsion force of the wheels and raises the front portion of the vehicle body, it is sufficient to fix the front wheel gear case at this position.

Note that in order to change from a high vehicle height to a low vehicle height, the driving force may be changed to the opposite of the above during the above procedure, and the rear vehicle height may also be changed in the same manner as described above.

As mentioned above, since the vehicle height is changed using the vehicle's own power, there is an advantage that no auxiliary equipment such as jacks or labor is required.

(c) Problems to be solved by the invention However, as will be explained below, in order to actually change the vehicle height, the operation is complicated, and there are disadvantages in that it is prone to erroneous operation and is dangerous.

In other words, changing the vehicle height at the front of the vehicle requires unfixing the front axle case, disconnecting power transmission to the rear wheels, braking the rear wheels, transmitting power to the front wheels, and fixing the front axle case. To change the vehicle height at the rear of the vehicle,
It is necessary to release the fixation of the rear axle case, disconnect power transmission to the front wheels, brake the front wheels, transfer power to the rear wheels, and fix the rear axle case, and these operations must be performed appropriately and reliably. Since each operation is performed by levers and the like that are provided independently, the operations are cumbersome and prone to erroneous operations.

(d) Means for solving the problem In this invention, an intermediate shaft and a rear wheel drive shaft are provided on the aircraft body, which are parallel and interlockingly connected to the front and rear axles, and the intermediate shaft and the front axle are The front axle case is rotatable and fixed around the center, and the rear axle is supported by the rear axle case, which can be rotated and fixed around the rear axle. A mechanism, a front wheel braking mechanism, a rear wheel drive disconnection mechanism, a rear wheel braking mechanism, and a rear axle case fixing mechanism are provided to brake one of the front and rear wheels, drive the other, and rotate the axle case on the driven side. In a vehicle in which the vehicle height can be changed by fixing the vehicle height, the operation receiving parts of each of the above mechanisms are connected to the vehicle body elevation control lever via a shift mechanism that has three rows on the left and right, with two operating positions in the front and rear for each row. Interlockingly connected, the above shift mechanism is
A forked part is provided at the end of the operating shaft that is suspended horizontally on the fuselage, and a lever support shaft inserted through the forked part is used to pivot the midway of the vehicle body elevation operating lever so that it can be rotated back and forth and left and right, and the lower end of the lever is The protruding engaging body is either a fork formed at the base ends of the first and second shift arms that are loosely fitted into the shift shaft suspended horizontally below the operation shaft, or a fork fixed on the same axis. The object of the present invention is to provide a vehicle body lifting/lowering operation lever structure for a vehicle capable of changing vehicle height, characterized in that each forked portion is interlocked and connected to the operation receiving portion. .

(E) Function/Effect According to this invention, the shift mechanism interposed between the vehicle body elevation control lever and the operation receiving part of each mechanism has three rows on the left and right, and two operating positions in the front and rear for each row. Therefore, it is possible to identify a total of six same lever operation positions, and among the five mechanisms, those that operate simultaneously, such as the front wheel braking mechanism and the rear axle case fixing mechanism, can be operated simultaneously. The ON/OFF of this operation corresponds to the front and back position of the left row of the vehicle body lift operation lever, and the operation receptors of the rear wheel drive disconnection mechanism and the rear wheel braking mechanism are interlocked and connected to enable this operation. The ON/OFF of the lever corresponds to the right row front and back position of the lever operation, and the operation receiving part of the front wheel drive disconnection mechanism is
By making the ON/OFF operation correspond to the front and rear positions of the center row of the same lever, it becomes possible to rationally brake the five mechanisms mentioned above with a single vehicle body raising/lowering control lever, making operation easier and preventing erroneous operation. This has the effect of preventing danger. In addition, by making only the front wheel drive disconnection mechanism correspond to the center row of the same lever actuation, the same lever can also be used as the four-wheel drive on/off lever during normal driving without changing the vehicle height. It can be done easily.

(F) Example The example of the present invention will be explained in detail based on the drawings.
In FIG. 1, A indicates an agricultural tractor as a vehicle, in which a prime mover section 2 is mounted on the upper surface of a frame 1, and a transmission case is connected via a clutch housing 3 extending rearward from the prime mover section 2. 4 are connected in series to drive the left and right rear wheels 5 disposed on the left and right sides of the case 4, and a front propeller shaft 6 extends forward from the case 4 to drive the frame 1 through the shaft 6. It is configured to drive left and right front wheels 7 disposed on the left and right sides.

In the figure, 8 is a handle, 9 is a seat, 10 is an operating lever, and 11 is an operating pedal.

FIG. 2 shows a front dog as a front wheel drive disconnection mechanism M1 interposed between the transmission case 4 in the middle of the front axle drive mechanism and the front propeller shaft 6, that is, between the front wheel differential and the transmission case 4. The clutch 12 and center brake 13 are shown, and the clutch 12 is connected to the transmission case 4.
The transfer gear 15 is loosely fitted into the transfer shaft 17 which is supported by passing through the front wall 16 of the transmission case 4. One meshing part 1 of the front dog clutch 12
8, and a sliding engagement portion 19 is fitted onto the shaft 17 to form a front dog clutch 12 as a front wheel drive disconnection mechanism M1.

20 is a lock ball, and 21 is a sleeve interposed between the shaft 17 and the sliding engagement portion 19 and having splines formed on its inner and outer peripheral surfaces.

Center brake 1 as front wheel braking mechanism M2
3, the transfer shaft 17 is inserted through the center brake case 22 provided on the front wall 16 of the transmission case 4, and the front propeller shaft 6 is connected to the outer end of the shaft 17. A plurality of friction plates 23 are spline-fitted to the shaft 17, and fixed plates 24, which cannot rotate but are slidable in the axial direction, are arranged alternately with the friction plates 23. The shear plate 25 connects the friction plate 23 and the fixed plate 2.
4 is compressed to apply a braking action to the transfer shaft 17.

In addition, 26 in the figure is the center brake case 22.
It is a back plate fixed to the brake shaft 2 through which the center brake case 22 is inserted.
When the pressure plate 25 is rotated around the transfer shaft 17 by the cam 28 formed at the inner end of the plate 25, 26
The pressure plate 25 operates to press the friction plate 23 and the fixed plate 24 together by the ball 29 interposed therebetween. Note that 30 is a return spring.

3 to 6 show the outer end of the front axle housing 31 and the front axle 32, and the power from the front wheel drive shaft 33 is transferred to the first and second bevel gears 3.
4, 35, King pin 3 with power transmission function
6. The drive pinion 40 is transmitted to the intermediate shaft 39 via the third and fourth bevel gears 37 and 38, and is formed integrally with the intermediate shaft 39, and the driven gear 41 spline-fitted to the front axle 32 is engaged with the driven gear 41. There is. Therefore, regardless of the steering operation of the front axle 32 about the king pin 36 and the vertical positional displacement of the front axle 32 about the intermediate shaft 39, power can be transmitted to the front axle without any problem.

In order to support the front axle 32, an inner case 42 parallel to the intermediate shaft 39 is provided at the outer end of the front axle housing 31, and an outer case 43 is rotatably fitted into the inner case 42 to support the upper and lower ends of the king pin 36. A circular fitting recess 44 centered on the intermediate shaft 39 is formed on the outer surface of the outer case 43, and the recess 44
In addition, a fitting convex portion 46 formed on the inner surface is rotatably fitted into a front axle case 45 that pivotally supports the front axle 32 and the intermediate shaft 39.

Further, 47 in the figure is a stop bolt whose tip is inserted into an engagement groove 48 provided on the outer peripheral surface of the fitting convex portion 46 to maintain the above-mentioned fitted state.
Numerals 9 and 49 are fixing bolts provided at symmetrical positions with respect to the intermediate shaft 39, and the bolts 49 and 49 are inserted through ears 50 and 50 formed in the front axle case 45 and screwed into the outer case 43. Accordingly, the same case 45 was placed in two states: one with the front axle 32 positioned upward as shown in FIGS. 3 and 4, and the other with the front wheel 32 positioned downward as shown in FIGS. 5 and 6. It is configured so that it can be fixed.

In addition, S1, S2, and S3 in the figure are the front axle case 4.
5 is a stopper for regulating the rotation range, 51 is a wheel mounting flange, 52 is a bolt, 53 is a front wheel, and 54 is a knuckle arm.

FIG. 7 shows a rear wheel drive disconnection mechanism M3 and a rear wheel braking mechanism M4 provided on the left and right sides of the transmission case 4. A rear drive pinion 59 is formed at the outer end of the rear axle 55 and meshes with a rear driven gear 61 spline-fitted to the rear axle 60. Therefore, it is possible to transmit power to the rear axle 60 without any problem regardless of the position change of the rear axle 60 about the intermediate shaft 56, and in order to support such a power transmission mechanism, the transmission case 4 is A rear axle housing 62 that encloses the intermediate shaft 56 is protrudingly provided on the left and right side surfaces, and a circular fitting convex portion 63 centered on the coaxial shaft 56 is provided on the outer surface of the housing 62.
A fitting recess 6 is formed on the inner surface of the rear axle case 64 which projects and supports the rear axle 60 in the convex part 63.
5 is rotatably fitted to the outside of the rear axle housing 62.
The fixing bolt 6 inserted into the case 64 and screwed onto the same case 64
6, the rotation is fixed.

In addition, a cylindrical body 67 is provided on the inner surface of the rear axle case 64 so as to protrude around the intermediate shaft 56, and the tip of the cylindrical body 67 is attached to a bearing part 68 provided on the inner peripheral surface of the rear axle housing 62. A retaining ring 69 for the shaft is fitted to the tip of the cylindrical body 67 to prevent the rear axle case 64 from moving outward.

Further, one of the rear wheel drive shafts 55 is provided with a rear wheel drive disconnection mechanism M3, which abuts an intermediate shaft 56 against the outer end of the rear wheel drive shaft 55 via a pilot bearing 57. A rear dog clutch 58 as a rear wheel drive disconnection mechanism M3 is interposed between each shaft 55 and 56 to enable power transmission to be disconnected by sliding the staying piece 58a. A rear drive pinion 59 is formed at the outer end of the shaft 56 and is meshed with a rear driven gear 61 of a rear axle 60.

The rear wheel braking mechanism M4 is provided on the rear wheel drive shaft 55 on the side where the rear wheel drive disconnection mechanism M3 is not provided, and the mechanism M4 is provided on the rear wheel drive shaft 55 on the side where the rear wheel drive disconnection mechanism M3 is not provided.
It is provided inside the attachment base to the transmission case 4 of No. 2, and has approximately the same configuration as the center brake 13 described above, and includes a plurality of brake discs 85 spline-fitted to the rear vehicle drive shaft 55 and the same housing. Brake pads 86, which are non-rotatably provided on the inner side of the handbrake operating shaft 88, are alternately stacked on top of each other, and as shown in FIG. At 87, the brake disc 85 and brake pad 86 are pressed to obtain a braking action.

Note that S4 and A5 in Figure 7 are the rear axle case 64.
91 is a differential, and 92 is a differential lock.

Further, a rear axle case fixing mechanism M5 is interposed between the base outer circumferential surface 70 of the cylindrical body 67 and the tip inner circumferential surface 71 of the fitting convex part 63, and the mechanism M5
The base outer circumferential surface 70 is formed into an outer tapered shape whose diameter is reduced in the direction of the rear axle housing 62, and the tip inner circumferential surface 71 is formed into an inner tapered shape whose diameter is reduced in the rear axle case 64 direction. Inner peripheral surface 7
1, a tapered ring 74 is interposed between the tapered ring 7 and the tapered ring 7.
4, three ring pieces 74 as shown in FIG.
a, 74b, 74c, each piece 74a, 74
A screw hole 75 is formed in each of the screw holes 75 and 74c, and the rear axle case 64 and the housing 62 are fixed or released by tightening or loosening a fixing bolt 76 screwed into the screw hole 75.

In the figure, 77 is a retaining ring for preventing the fixing bolt 76 from falling off, S4 and S5 are stoppers, and 120 and 121 are a rear wheel and a lightning wheel drilled in the same wheel.

In addition, each ring piece 74 of the tapered ring 74
Positioning holes 78 are bored at predetermined positions of a, 74b, and 74c, and a stud 79 built into the rear axle case 64 is fitted into the hole 78. A tapered hole 78a is formed on the 62 side to enable insertion and removal of the tip of a fixing pin 80, which will be described next.

The fixed pin 80 is slidably installed on the upper part of the rear axle housing 62 and biased by a spring 81 in the direction of the taper ring 74. The fixed operating shaft 8
2 and the lever 83 are rotated to insert the pin 80 into and remove it from the tapered hole 78a, thereby connecting the rear axle case 64
The rotation of the lock lever is locked or unlocked.

Note that 84 in FIG. 8 is a recessed portion.

And each mechanism M1, M2, M3, M4, M5
, namely, the sliding engagement portion 19 of the front wheel drive disconnection mechanism M1, the brake shaft 27 of the front wheel brake mechanism M2, the sliding piece 58a of the rear wheel drive disconnection mechanism M3, and the side brake operation of the rear wheel brake mechanism M3. The shaft 88 and the fixing pin 80 of the rear axle case fixing mechanism M4 are operated by the operation transmission mechanism M6 described below.

As shown in FIGS. 13 and 14, the operation transmission mechanism M6 has a brake lever 93 fixed halfway to the outer end of the brake shaft 27 of the center brake 13, a first wire 94 at its upper end, and a second wire at its lower end.
A third wire 96 is connected between the lower end of the wire 95 and the brake shaft 27, and
As shown in FIG. 7, a rear clutch lever 98 is fixed to the outer end of a hawk shaft 58c, which is connected with a hawk 58b for sliding the sliding piece 58a of the rear dog clutch 58. A fourth wire 97 is connected to the tip, and the aforementioned first wire is connected to the tip of the fixing operation lever 83 of the fixing mechanism M4.
The other end of the wire 94 is connected, and the rear end of the brake rod 102 is connected to a handbrake lever 101 connected to a handbrake operating shaft 88 shown in FIG.

And the second, third and fourth wires 95, 9
6, 97 and the terminals of the brake rod 102 are connected to a shift mechanism M7 that is interlocked with a vehicle body elevating operation lever 103 provided near the seat 9.

As shown in FIGS. 15 and 16, the shift mechanism M7 has a horizontal operation shaft 104 protruding from the body, a forked portion 105 at the end of the coaxial shaft 104, and a forked portion 105.
A lever support shaft 106 inserted through a lever support shaft 103 is connected to a vehicle body lifting/lowering operating lever 103 so as to be able to rotate diagonally forward and upward, forward and backward, and left and right. Forked portions 109a and 110a formed at the base ends of the first and second shift arms 109 and 110, which are loosely fitted to the shift shaft 108 that protrudes in the transverse direction, and a forked portion 111 that is fixed to the same shaft 108. It is designed to engage the inside of either.

The first shift arm 109 has the forked portion 109a.
The second shift arm 110 is formed in a substantially triangular shape and extends diagonally backward and downward, and a third wire 96 is connected to the lower end thereof.
A fourth wire 97 is connected to the downward apex of the shift shaft 108 in the diagonally rearward and downward direction, and the front end of the brake rod 102 is connected to the apex of the same shaft 108 in the following manner.

A shock absorber 113 using a coil spring 112 is interposed at the front end of the brake rod 102, and is connected to the apex through an elongated hole 115 drilled in the front end of a base plate 114 of the shock absorber 113. A four-wheel drive on/off lever 116 is connected to the inner end of the shaft 108, and the lever 116 is operatively connected to the sliding engagement portion 19 of the front dog clutch 12.

In addition, numeral 117 in the figure is a defroc lock pedal.

Further, the vehicle body lifting/lowering operation lever 103 is connected to a guide hole 119 formed in a guide plate 118 shown in FIG.
is inserted into the guide hole 119,
By operating the lever 103 to each of the positions P1 to P6, the shift mechanism M7 and operation transmission mechanism M5 configured as described above operate each part as shown in the attached table.

Note that P7 and P8 are P4 and P8 of the same lever 103.
This is the lock position at position 6.

The embodiment of the present invention is constructed as described above, and when changing the vehicle height, the fixing bolts 49 of the front axle case 45 and the fixing bolts 66 of the rear axle case 64
By removing the fixing bolt 76 of the fixing mechanism M4, the front and rear axle cases 45, 64 can be rotated.

As shown in FIGS. 3 to 6, the bolt head of the fixing bolt 49 is exposed on the side surface of the front axle case 45, and there is a large space between the side surface of the case 45 and the front wheels 7 and 53. , so it can be tightened or loosened using a double-ended or offset spanner, and the fixing bolt 66 is the seventh
As shown, the bolt head is exposed on the inner side of the rear axle housing 62 and can be tightened or loosened using a double-ended or offset spanner or the like. Further, as shown in FIGS. 7, 18, and 20, the fixing bolt 76 has a bolt head exposed on the outer side surface of the rear axle case 64.
A box spanner 122 is inserted into the lightning wheel 121 of the rear wheel 120, and the box spanner 122
It can be tightened or relaxed by

Next, move the vehicle body lift operation lever 103 to P4 or P.
7, power can be transmitted to the front wheels 7, and the rear wheels 5 are prevented from rotating by the side brake mechanism M3.

In such a state, if forward (reverse) power is transmitted to the front wheels 7, the vehicle body cannot move forward or backward, so the torque of the intermediate shaft 39 rotates the front axle case 31 in the direction of raising (lowering) the vehicle body. become.

Further, since the rotational force acts on the front wheel 7, a force that moves the front end of the front axle case 31 in the front (rear) direction acts, thereby assisting the torque of the intermediate shaft 39.

The rotation range of the front axle case 31 is restricted by stoppers S1, S2, and S3.
At the end of the rotation of the case 31, the fixing bolt 4
By tightening the screws 9, the vehicle height change to the front of the fuselage is completed.

Note that during the above operation, rotation of the rear axle case 64 is locked by the fixing pin 80.

In addition, FIGS. 3 and 4 are a front sectional view and a side view when the front part of the vehicle body is set at a low vehicle height, and FIGS.
FIG. 6 is a sectional view and a side view when the vehicle height is high.

In addition, the vehicle body elevation operation lever 103 is set to P6 or P6.
8, the front wheels 7 are prevented from rotating by the center brake 13, power can be transmitted to the rear wheels 5, and the rotation lock of the rear axle case 64 by the fixing pin 80 is released.

In this state, when forward (reverse) power is transmitted to the rear wheels 5, the vehicle body does not move forward (reverse) because the front wheels 7 are prevented from rotating, and the torque of the intermediate shaft 56 is
The rear axle case 64 is rotated in a direction to raise (lower) the vehicle body.

Further, since the rotational force acts on the rear wheel 5, a force that moves the tip of the rear axle case 64 in the front (rear) direction acts, thereby assisting the torque of the intermediate shaft 39.

The rotation range of the rear axle case 64 is restricted by stoppers S4 and S5, and the fixing bolts 66 and 76 are fixed at both ends of the rotation of the rear axle case 64.
By screwing in and tightening, the vehicle height change at the rear of the fuselage is completed.

In addition, Figures 18 and 19 are side views and front views when the rear part of the aircraft has a low vehicle height.
21 are a side view and a front view when the vehicle height is high.

As mentioned above, by installing the center brake 13 in the middle of the front axle drive mechanism M1, it is possible to brake both the left and right front wheels 5, 5, so that it is possible to brake both the left and right front wheels 5. It is possible to prevent the tractor A from moving forward or backward, and since the left and right braking forces are balanced, the vehicle height can be changed safely without causing sharp turns or tilting of the machine body.

As mentioned above, by interlocking the operation receiving parts of the simultaneous operation mechanisms and interlockingly connecting them to the single vehicle body lifting/lowering operation lever 103 via the shift mechanism M7, the operation and its device are simplified. This has the effect of preventing dangers caused by erroneous operation.

[Brief explanation of the drawing]

FIG. 1 is an overall side view of a tractor having the mechanism of the present invention. FIG. 2 is a longitudinal sectional view of the front axle drive mechanism.
3 and 4 are a cross-sectional front view and a side view of the outer end of the front axle (when the vehicle height is low). 5 and 6 are a cross-sectional front view and a side view of the outer end of the front axle (at the height of the vehicle). FIG. 7 is a cross-sectional front view around the rear axle and rear wheel drive shaft. FIG. 8 is a front view of the tapered ring. Figures 9, 10, and 11 are
Figure -, -, - Cross-sectional view. Figure 12 shows
A sectional view around the handbrake operating shaft. FIG. 13 is a front view of the front axle drive mechanism. FIG. 14 is a side view of the operation transmission mechanism. FIG. 15 is a plan view of the same. 1st
FIG. 6 is a sectional view of FIG. 14. FIG. 17 is a front view of the guide plate. FIGS. 18 to 21 are diagrams showing the operating state of the rear axle case. M1...Front wheel drive disconnection mechanism, M2...Front wheel braking mechanism, M3...Rear wheel drive disconnection mechanism, M4...Rear wheel braking mechanism, M5...Rear axle case fixing mechanism, M7
...Shift mechanism, 5...Rear wheel, 7...Front wheel,
32...Front axle, 39...Intermediate axle, 45...Front axle case, 55...Rear wheel drive shaft, 60...Rear axle, 64...Rear axle case, 103...Vehicle body elevation operation lever.

【table】

【table】

Claims (1)

[Scope of Claim for Utility Model Registration] An intermediate shaft 39 and a rear wheel drive shaft 55 which are parallel to and interlocked with the front and rear axles 32 and 60, respectively, are disposed on the body side, and the intermediate shaft 39 and the front axle 32 are connected to the intermediate shaft 39.
The rear axle case 45 is rotatably supported by a front axle case 45 that can be rotated and fixed around the rear wheel drive shaft 55. In addition, the front wheel drive disconnection mechanism M
1. Front wheel braking mechanism M2, rear wheel drive disconnection mechanism M3,
A rear wheel braking mechanism M4 and a rear axle case fixing mechanism M5 are provided to brake one of the front and rear wheels 7, 5, drive the other, and rotate and fix the axle case on the driven side, thereby increasing the vehicle height. In a vehicle that can be changed, the operation receptors of the above-mentioned mechanisms M1, M2, M3, M4, and M5 are operated to raise and lower the vehicle body through a shift mechanism M7, which has three rows on the left and right, with two operating positions in the front and rear for each row. The shift mechanism M7 is interlocked with the lever 103, and has a fork 105 at the end of an operating shaft 104 that is suspended horizontally on the vehicle body, and operates the vehicle body elevation operating lever 10 via a lever support shaft 106 inserted through the fork 105.
The first and second shift levers 103 are pivotally supported in the middle of the lever 103 so as to be rotatable left and right after the war, and an engaging body 107 protruding from the lower end of the lever 103 is loosely fitted into a shift shaft 108 horizontally suspended below the operating shaft 104. Forked portions 109a and 110a formed at the base ends of arms 109 and 110, respectively
, each fork 109
A vehicle body lifting/lowering operation lever structure for a vehicle capable of changing vehicle height, characterized in that levers a, 110a, and 111 are respectively interlocked and connected to the operation receiving portion.