JPH0354200Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Related Technical Field) The present invention relates to a traveling control device for a construction machine such as a hydraulic excavator.

(Prior art) When conventional construction machinery such as hydraulic excavators travel in a straight line, a travel control lever is connected via a link or the like to the left and right direction switching valves that control the direction of pressure oil to the left and right travel motors. Alternatively, the pedals were operated simultaneously in the same direction to drive straight ahead. However, it is difficult to operate the left and right travel levers or pedals with the same displacement at the same time, and if the driver shifts to the left or right when starting, or when traveling a long distance, the driver's operation of the travel levers or pedals may be affected by the vibration of the main body. It had the disadvantage that the amount was different on the left and right sides, and it meandered.

(Purpose of the invention) When driving in a straight line, this invention can be done by operating two levers or two pedals in the same direction at the same time as in the past, but it is now possible to drive in a straight line by operating only one pedal. The aim is to make driving easier.

(Summary of configuration) In construction machinery such as hydraulic excavators, a pair of pedals or levers is used in addition to the conventional operating lever or pedal for driving, and by operating one, it is possible to move straight forward, and by operating the other. The vehicle is characterized in that it can be operated using a link so that it can travel straight forward or backward.

(Example) The configuration of the present invention will be explained using an example shown in the drawings.
FIG. 1 is a front view, FIG. 2 is a left side view, FIG. 3 is a right side view, FIG. 4 is a top view, and FIG. 5 is a sectional view taken along line AA in FIGS. 2 and 3. FIG. 6 is a sectional view taken along line BB in FIG. 3. FIG. 7 is a sectional view taken along line CC in FIG.

Reference numeral 1 denotes a left travel lever, which is fixed to the left travel link 4 via a lever 4a with a nut 3. 2 is the right travel lever, and similarly the lever 5 is attached to the right travel link 5.
It is fixed with a nut 3 via a. Reference numeral 4b denotes a lever fixedly attached to the travel link 4, which operates a left travel direction switching valve (not shown) via a yoke 10 connected with a pin 13 and a rod 8 fixed to the yoke 10 with a nut 12. Activate. The same applies to the right side, and 5b is a lever provided on the right side traveling link 5, and the yoke 1 connected by a pin 14
1 and a rod 9 fixed to the yoke 11 with a nut 12, a right-hand travel directional switching valve (not shown) is operated. 4c is a lever fixed to the left running link 4, and 5c is a lever fixed to the right running link 5.

The left and right travel links 4 and 5 are rotatable around a pin 6, and one end of the pin 6 is connected to the driver's seat floor plate 15 with a pin 7.
(Fig. 6). Similarly, the other end of the pin 6 is attached to the driver's seat floor plate 1.
It is supported by a bracket 15b provided at 5. A link 16 is connected to the lever 4c and a lever 22a fixed to the link 22 by pins 18 and 20, and transmits the movement of the lever 1 for left travel to the link 22. Similarly, 17 is a lever 5c and a link 23.
Each pin 19 and 21 is attached to a lever 23a provided in
The movement of the right travel lever 2 is transmitted to the link 23 by the link connected with the link 23. 22b and 22c are levers provided on the link 22, and 23b and 23c are levers provided on the link 23. The links 22 and 23 are rotatable around the pin 24 (sixth
), the pin 24 has one end connected to the pin 25 on the driver's seat floor plate 1.
The other end of the pin 24 is fixedly supported by a bracket 15c provided on the driver's seat floor plate 1.
It is supported by a bracket 15d provided at 5. Reference numeral 26 denotes a link, which has a sufficiently large elongated hole so that the pin 30 can transmit the movement of the lever 22b in only one direction. Normally, link 26 and pin 30 are in close contact. 27, 28, and 29 are also similar links, and have elongated holes large enough so that the pins 31, 32, and 33 transmit only one direction of movement of the levers 23b, 22c, and 23c. link 26
Similarly, normally each link 27, 28 and 29 is in close contact with a respective pin 31, 32 and 33.
Taking FIG. 1 as an example, each pin 30, 31, 3
Links 26 and 33 respectively move upward only when 2 and 33 move upward.
27, 28, 29, each pin 3
0, 31, 32, and 33 individually move downward, each pin 30, 31, 32, and 33 simply moves through the elongated hole provided in each link 26, 27, 28, and 29. . Also each link 26,2
The elongated hole dimensions of 7, 28 and 29 are for each pin 30,
It is slightly larger than the maximum movement amount of 31, 32 and 33 + pin diameter.

A pin 34 fixes one end of the pin 39 to a bracket 15e provided on the floorboard 15 of the driver's seat.
The other end of the pin 39 is supported by a bracket 15f provided on the floorboard 15 of the driver's seat. A pin 35 connects the links 26 and 27 to a bracket 37a provided on the reverse pedal 37. 36 is link 28,2
9 is a pin that connects to a bracket 38a provided on the forward pedal 38. Here, the forward pedal 38 and the reverse pedal 37 are each rotated around a pin 39. In addition, in these configurations, the levers 4b and 5b have the same length around the pin 6, and the levers 4c and 5c also have the same length around the pin 6. The levers 22a and 23a have the same length around the pin 24, and the levers 22b and 23b and the lever 2
2c and 23c also have the same length with the pin 24 as the center. Further, links 26 and 27 are of the same size, and links 28 and 29 are also of the same size.

(Operation) The present invention has the above-mentioned configuration, and its operation will be explained using FIGS. 8 to 13.

A Regarding the case where only the left travel lever 1 is in the position, that is, the left travel direction switching valve is set in the forward direction (Fig. 8): When only the left (right) travel lever 1 is turned forward, the pin 18 is The lever 4c moves the lever 4c around the pin 6, that is, to the rear. pin 1
When 8 moves, the pin 20 also moves into position, ie backwards, via the link 16. Further, since the pin 20 is also connected to the link 22a, the link 22
rotates about the pin 24, the lever 22b rotates upward, and the pin 30 is in position. On the other hand, the lever 22c rotates downward, and the pin 32 is in position. Now, when the pin 30 moves into position or upwardly, it pushes the link 26 upwardly. As a result, the pin 35 at the other end of the link 26 also moves upward, and the reverse pedal 37 also rises upward. Due to this, the link 27 is also moved upward by the pin 35, but since the other end of the link 27, that is, the pin 31 side, is a sufficiently large elongated hole, the pin 31 is maintained at its current position. This means that even if only the left travel lever 1 is operated in the forward direction, the right travel lever 2 will not be moved. In other words, pressure oil is supplied only to the forward movement side of the left travel motor, causing a pivot turn to the right.

On the other hand, the lever 22c moves the pin 32 downward, but the pin 33 side maintains its original position, so the pin 36 remains in its original position with the link 29.
Advance pedal 38 is not moved. Note that even if the pin 32 moves downward, the movement of the pin 32 will not be hindered because the hole on the pin 32 side of the link 28 is a sufficiently large elongated hole.

The above description has been made regarding the case where the left running lever 1 is operated, but the same operation occurs when the right running lever 2 is operated.

B Regarding the case where only the left travel lever 1 is in the position, that is, the left travel direction switching valve is set in the reverse direction (Fig. 9): When only the left travel lever 1 is in the position, that is, rotated backward, the pin 18 moves the pin 6. The lever 4c moves the center position, that is, forward. pin 18
and the link 16 are connected, so the pin 2 connected to the other end of the link 16 via the link 16
0 is also moved in position, i.e. forward. Further, since the pin 20 is also connected to the lever 22a, the link 22 can be rotated around the pin 24.
The lever 22c rotates upward and the pin 32 is in position.

Here, when the pin 32 moves into position, ie upward, it pushes the link 28 upward. As a result, the pin 36 at the other end of the link 28 also moves upward, and the forward pedal 38 also rises upward. This also causes the link 29 to move upward due to the pin 36, but since the other end of the link 29, that is, the pin 33 side, is a sufficiently large elongated hole, the pin 33 is maintained at its current position. That is, even if only the left running lever 1 is operated in the reverse direction, the right running lever 2 will not be moved. Therefore, pressure oil is supplied only to the reverse side of the left travel motor, causing a pivot turn to the left.

On the other hand, the lever 22b moves the pin 30 downward, but the pin 31 side maintains its current position, so the link 27 causes the pin 35 to remain in its current position, and the reverse pedal 37 does not move. Not done. Note that pin 3
Even if 0 moves to the position i.e. downward, the link 26
Since the hole on the pin 30 side is a sufficiently large elongated hole, the movement of the pin 30 is not hindered. Here, the case where only the left running lever 1 is operated in the reverse direction has been described, but since the same operation occurs when only the right running lever 2 is operated, the explanation will be omitted.

C. When the left and right travel levers 1 and 2 are set at the same time, that is, the left and right travel direction switching valves are placed in the forward direction (Fig. 10). : When the left and right travel levers 1 and 2 are simultaneously rotated to the forward position, pins 18 and 19 are moved to pin 6.
The levers 4c and 5c are used to move the camera to the rear position using the levers 4c and 5c. Pins 18 and 19 are connected to links 16 and 17, respectively, so that link 16
The pins 20 and 21 connected to the other ends of the links 16 and 17 via the pins 20 and 17 are also moved to the rear. Further, since the pins 20 and 21 are also connected to levers 22a and 23a, respectively, the links 22 and 23 respectively rotate about the pin 24, the levers 22b and 23b rotate upward, and the pins 30 and 31 are in position. That is, move upward.

Now, when pins 30 and 31 move into position or upwardly, they push links 26 and 27 upwardly. As a result, the pin 35 at the other end of the links 26, 27 also rises, and the reverse pedal 37 also rises. On the other hand, each link 22c and 23c rotates downward and each pin 3
2 and 33 move into position, ie, downward. When the pins 32 and 33 move downward, the links 26 and 27 no longer hold the links 26 and 27 because they are sufficiently large elongated holes. As a result, the pin 36 at the other end of the links 28, 29 is in the same position, but it is lowered by the weight of the forward pedal 38 and the like.

As can be seen from the above, since there is no link mechanism that obstructs the switching direction of the left and right travel direction switching valves, pressure oil is supplied only to the forward movement side of the left and right travel motors, and the vehicle moves forward. In addition, here are links 26, 27,
Make the dimensions of 28 and 29 the same, and pin 39
If the distance from the pin 35 to the pin 35 and the distance from the pin 39 to the pin 36 are configured to be the same, the rotation angles of the forward pedal 38 and the reverse pedal 37 will be the same in opposite directions centering on the pin 39. Therefore, it is as if the forward pedal 38 and the reverse pedal 37 operate as one.

The case where the left and right traveling levers 1 and 2 are placed in the forward direction at the same time has been described, but since they operate in the same way when they are placed in the reverse position, the explanation will be omitted.

D Regarding the case where the lever 1 for left travel is set to the forward position, and the lever 2 for right travel is set to the forward position, and the lever 2 for right travel is set to the reverse position (Figure 11): Left When the travel lever is rotated to the forward position, the reverse pedal 37 is activated as explained in A] above.
moves in position, i.e. upwards. Also, the right travel lever 2 is moved upward, and pressure oil is supplied to the forward drive side of the left travel motor, and pressure oil is supplied to the reverse travel side of the right travel motor. In other words, the vehicle spins and turns to the right. As can be seen from the above explanation, if the movements of the forward and backward pedals 38 and 37 are ignored, the same operation as the conventional machine can be obtained.

Next, the case where the vehicle travels straight with one pedal, which is the main operating method of the present invention, will be explained.

E Regarding the case of forward operation by operating the forward pedal 38 to the lower position (12th
Figure): When the forward pedal 38 is rotated downward, the bracket 38a of the forward pedal 38
The pin 36 connected to moves downward around the pin 39. Since the pin 36 is also connected to the links 28 and 29, the links 28 and 29 are also pushed down, and the pins 32 and 33 inserted into the elongated holes at the other ends of the links 28 and 29 are moved to the pushed down position, respectively. Since these pins 32 and 33 are connected to levers 22c and 23c, respectively, links 22 and 23 rotate around pin 24. As a result, the levers 22b and 23b also rotate, the pins 30 and 31 move upward, pushing up the links 26 and 27, and the reverse pedal 37 connected to the pin 35 also rotates upward. move.

Also, since the levers 22a and 23a also rotate, the pins 20 and 2 connected to the levers 22a and 23a
1 also move to their respective positions, that is, to the rear. The amount of movement of pins 20 and 21 is transmitted to pins 18 and 19 by links 16 and 17, respectively, levers 4c and 5c also rotate, and links 4 and 5 also rotate in the same direction. Due to this, the levers 1 and 2 for left and right travel are also rotated in the respective directions, that is, forward. This is the same as operating the left and right travel levers 1 and 2 simultaneously in the forward direction, and pressurized oil is supplied to the forward movement side of the left and right travel motors to move forward.

Here links 28 and 29, levers 22c and 23
c, levers 22a and 23a and levers 4b and 5b
have the same dimensions, so the forward pedal 38
In proportion to the amount of operation, the amount of operation of the left and right travel direction switching valves is also switched by the same amount, allowing straight-line travel.

F When the reverse operation is performed by operating the reverse pedal 37 to the lower position (Fig. 13): In this case, the operation explanation in section E is exactly opposite,
Go backwards. Also links 26 and 27 and lever 22b
and 23b have the same dimensions, so as explained in section E, the left and right travel direction switching valves are switched by the same amount in proportion to the amount of operation of the reverse pedal 37, allowing straight-ahead travel.

In the above explanation, the levers 1 and 2 for left and right travel are of the lever type, but it goes without saying that they may be of the pedal type, and the pedals 38 and 37 for forward and backward travel may also be of the lever type. Furthermore, although the center of rotation of the forward and backward movement pedals 38 and 37 has been described as a single pin 39, it is of course possible to separate the rotation centers and place them separately.

(Effects) Since the travel control device of the present invention is configured as described above, it can be operated in the same manner as conventional construction machinery such as hydraulic excavators when traveling.
If you only want to drive straight, you can drive straight by pressing down on one of the forward travel pedals when moving forward, or by pushing down on one of the reverse travel pedals when traveling in reverse. ,
Since the amount of operation of the left and right travel direction switching valves is switched by the same amount in proportion to the amount of depression of each pedal, smooth simultaneous start is possible.

[Brief explanation of the drawing]

FIG. 1 is a front view of the traveling control device of the present invention. Figure 2 is a left side view of Figure 1. Figure 3 is also a right side view.
Figure 4 is also a plan view. Figure 5 is the same as Figure 2 or 3.
AA sectional view of the figure. FIG. 6 is a sectional view taken along line BB in FIG. 3. FIG. 7 is a cross-sectional view taken along line CC in FIG. 8 to 13 are explanatory views of the operation of this device. In the figure: 1...Left travel lever, 2...Right travel lever, 3...Nut, 4...Left travel link,
4a, 4b, 4c...Lever, 5...Right running link, 5a, 5b, 5c...Lever, 6...Pin,
7...pin, 8...rod, 9...rod, 10
...Yoke, 12...Natsuto, 13...Pin, 1
4... Pin, 15... Floor board, 15a, 15b, 1
5c, 15d, 15e...Bracket, 16...
Link, 17... Link, 18, 19, 20, 2
1...Pin, 22...Link, 23...Link,
22a, 22b, 22c... lever, 23a, 2
3b, 23c... lever, 24, 25... pin,
26, 27, 28, 29...link, 30, 3
1, 32, 33, 34, 35, 36...pin, 3
7... Reverse pedal, 37a... Bracket, 38
...Forward pedal, 39...pin.

Claims (1)

[Scope of utility model registration request] A lever 1 for left travel, a lever 2 for right travel, and a reverse pedal 3 rotatably supported on the driver's seat floorboard.
7 and a forward pedal 38, the left and right travel levers 1 and 2 are attached to a left travel link 4 and a right travel link 5, which rotate around a pin 6, via levers 4a and 5a, respectively, The traveling link 4 and the right traveling link 5 are connected via a link mechanism to a link 22 and a link 23, respectively, which are rotatably attached to a pin attached to the floorboard of the driver's cabin, and the link 22 has a pair of links. The levers 22b and 22c are fixed, and the link 2
A pair of levers 23b and 23c are fixed to the lever 3, and these levers have links 26, 27 and links 28, 2 connected by pins to the reverse pedal 37 and the forward pedal 38, respectively.
A traveling control device for a construction machine such as a hydraulic excavator, characterized in that the travel control device is connected to the hydraulic excavator via a long hole.