JP2852444B2 - Lever device with pedal - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling operation device for a crawler vehicle such as a crawler shovel.

2. Description of the Related Art FIG. 9 is a perspective view showing the vicinity of a driver's seat of a crawler excavator provided with a traveling operation device of a conventional technology. In the figure, 1 is the driver's seat, two floor, 3 _L, 3 _R left and right travel operation lever, 4 _L, 4 _R, respectively left and right operating lever 3 _L, 3 _R is fixed to the pedal, 5 _L, 5 _R each traveling switching valve of the left and right, 6 operating lever 3 _L, 3 _R a traveling switching valve 5 _L, 5 _R each spool and connected respectively to have linkage, 7 _L, 7 _R Are left and right operation levers for operation.

In the prior art traveling operation device, two operation levers 3 _L ,
3 _R is provided. And the lower part of the operation lever 3 _L , 3 _R ,
The traveling switching valves 5 _L and 5 _R are connected to each other via a link mechanism 6. So when performing running crawler excavator (not shown), when both the tilting operation forward or backward the operating lever 3 _L, 3 _R, crawler excavator performs a forward rectilinear or backward straight. Also when tilting operation both relative the longitudinal direction the operating lever 3 _L, 3 _R, crawler excavator performs left spin turn or right spin turn.
Further, by tilting only one of the operation levers 3 _L and 3 _R forward or backward, the vehicle can move leftward, rightward or backward.
Perform a forward or left reverse pivot turn.

Further, as a traveling operation device (not shown) of another embodiment of the prior art, a mechanical operation device has been used. In this mechanical traveling operation device, a mono lever is provided as a traveling operation lever, and the left and right traveling switching valves are controlled via a link mechanism by operating the mono lever.

Problems to be Solved by the Invention In the prior art traveling operation device, two operation levers are provided upright on the front side of the driver's seat as shown in FIG. 9, so that the driver's view of the lower front side is obstructed. Was. Since the two operating levers could not be operated by the driver with one hand, the driving operation was inconvenient for the driver. Further, when operating the operation lever, the driver had to extend his hand forward, which was a problem.

Further, in the mechanical traveling device of the prior art, the number of parts such as the link mechanism is large, the structure is complicated, and the operation force is heavy. And, when it is used for a long time, rattling occurs at each connecting portion of the component parts, and it is often difficult to use.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a lever-equipped lever device that uses a hydraulic pilot valve type remote control valve, has a small number of components, is compact, and can be operated with a light operating force.

Means for Solving the Problems Means of the present invention taken to solve the above problems are as follows. B. A left and right forward switching pilot valve is disposed forward and a left and right reverse switching pilot valve is disposed rearward. (C) the vehicle is turned forward and backward by tilting the operating lever forward and backward, and the vehicle body is turned by rotating the operating lever; And a pair of left and right pedals is provided for the valve body of the pilot valve; Operate forward or backward by depressing both the left and right pedals forward or backward. The vehicle is configured to perform a turning operation by operating.

Action b. When the operation lever, which is a monolever, is tilted forward, the body of the crawler vehicle goes straight forward. When the operation lever is tilted rearward, the vehicle body travels straight rearward.

B. When the operation lever is operated in the left direction (counterclockwise) while the operation lever is in the upright state (neutral state for forward straight and backward straight), the vehicle body rotates left spin turn and conversely right (clockwise). When operated, a right spin turn is performed.

C. When the operation lever is tilted forward and rotated rightward, a right forward pivot turn is performed, and when the operation lever is rotated leftward, a left forward pivot turn is performed.

When the operation lever is tilted backward and rotated rightward, a right reverse pivot turn is performed, and when the operation lever is rotated leftward, a left reverse pivot turn is performed.

D. Next, when both the left and right pedals are operated forward, the vehicle body goes straight forward. Also, when the left and right pedals are both depressed rearward, the vehicle body moves straight backward.

E. If only the left pedal of the left and right pedals is depressed forward, only the left crawler advances, and if depressed rearward, only the left crawler reverses. If only the right pedal is depressed forward or backward, only the right crawler moves forward or backward. That is, as described above, the rightward advance, the rightward reverse, the leftward forward,
A left reverse pivot turn is possible.

F. Next, if the right pedal is simultaneously depressed forward and the left pedal is depressed rearward, the right crawler moves forward and the left crawler moves backward. That is, a left spin turn of the vehicle body is performed. Conversely, if the left pedal is depressed forward and the right pedal is simultaneously depressed rearward, the left crawler moves forward and the right crawler moves backward. That is, a right spin turn of the vehicle body can be performed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a lever device with a pedal according to the present invention.
FIG. 1 is a configuration diagram showing 10 (hereinafter, referred to as a lever device 10). 12
Is an operation lever which is a mono lever provided in the lever device 10, 13 is a cam, 14 is a valve body, 15, 16, 17, 18 (16, 18
Are not shown) are pilot valves arranged in the valve body 14, 19, 20, 21, 22 (20, 22 are not shown) are push rods of the pilot valves 15, 18 respectively, 23, 24, 25, 26 (24, 26 not shown) are pilot pressure introduction ports for remote control valve 11, 27 is tank port, 2
8, 29, 30, 31 (29, 31 not shown) is pilot valve 1
9, to 22, respectively out pilot pressure introduction port, respectively hydraulic pump for exiting the main圧吐32, the pilot pump 34, 35 is an oil tank, 36 is a left traveling motor 8 _L pilot switching valve, is 37 pilot pressure receiving pressure section of each pilot switching valve 36, 39 is the right traveling motor 8 _R pilot switching valve, respectively the pilot pressure receiving pressure section of the pilot changeover valve 39 and 41, reference numeral S each pilot valve 15, respectively to 18 The shuttle slidably inserted, 57 _L and 57 _R are left and right brackets provided on the valve body 14, respectively, 58 _L and 58 _R
Each left and right pedals, 59 is a pin that is pivotally supported on the pedal 58 _L, 58 _R to the bracket 57 _L, 57 _R, respectively. FIG. 2 is a sectional view taken along line AA of FIG. FIG. 3 is a detailed view of part B of FIG.
It is the figure seen from CCEFGH of the figure. In the figure, reference numeral 42 denotes a joint pin erected on the axis O-O in the upper part of the valve body 14, 43 denotes a nut for fixing the joint pin 42, 44 denotes a guide pin fixed to the joint pin 42, and 45 denotes a joint fitting. , 46 are groove-shaped stoppers formed on the sides of the joint fitting 45, 47 are pins for pivotally supporting the lower part of the cam 13 and the upper part of the joint fitting 45, and 60 are push rods 19, 22, respectively. , 61 is a large diameter portion, and 62 is a stepped portion between the large diameter portion 61 and the small diameter portion 60. FIG. 4 is a side view of a main part viewed from I in FIG. In the drawing, reference numeral 48 denotes a cam inclined surface formed on the cam surface on the lower surface side of the cam 13,
T is a matching ridge of the front-rear inclined surface formed along the X axis (the left-right direction of the vehicle body is the X axis). FIG. 5 is a sectional view taken along the line JJ in FIG. FIG. 6 shows K in FIG.
FIG. 21 is a bottom view showing the pilot pressure derivation ports 28, 31 of the pilot valves 19, 22 as viewed from a higher angle. The pilot pressure deriving ports 28 and 31 are respectively connected to the pilot pressure receiving portions 37 and 38 of the pilot switching valve 36 and the pilot pressure deriving port 2
Reference numerals 9 and 30 are respectively connected to the pilot pressure receiving portions 40 and 41 of the pilot switching valve 39. FIG. 7 is a cross-sectional view of FIG.
It is the top view seen from -L. In the figure, 63 and 64 long hole formed in the longitudinal direction to the left pedal 58 _L respectively, 65 and 66 is a long hole formed in the longitudinal direction to the right pedal 58 _R, respectively.
Push rods 19, 22, 2
0,21 small diameter portion 60 is inserted and push rod 19, ~,
Since the stepped portions 62 of the 22 is in contact with the pedal 58 _L, 58 _R underside, the push rod 19 by the front-rear direction depressing the pedal 58 _L, 58 _R, ~, it is possible to perform pushing operation of 22. FIG. 8 is a cross-sectional view taken along line MM (similarly when viewed from NN) of FIG. In the figure, 67 _F and 67 _R are spring members provided on the front and rear sides of the lower surface of the pedal 58 _L (58 _R ), respectively, 68 is a spring guide, imaginary line C, and d is the pedal 58 _L (58 _R ).
3 shows the state of the stepping operation.

Next, the configuration of the lever device 10 according to the present invention will be described with reference to FIGS. For convenience of explanation, the left-right direction of the body (not shown) of the crawler vehicle is X-axis and the front-rear direction is Y
Set to axis. Valve body for X axis and Y axis
The phase is set to the angle α ° around the axis O of 14 (see Fig. 2).
Then, the pilot valves 15 and 18 were provided. On the other hand, the cam 13 is fixed and attached to the lower end of the operation lever 12, and the joint pin 42 is fixed to the shaft center O of the valve body 14 to stand upright.
A joint fitting 45 is connected to the upper part of the joint pin 42 so as to be rotatable in the left and right direction by a predetermined angle θ about the axis O of the valve body 14 as the center of rotation. The cam 13 was connected to the joint fitting 45 so as to be tiltable in the front-rear direction, and a cam inclined surface 48 was formed on the cam surface on the lower surface side of the cam 13 in the front-rear direction about the X axis. Since a groove-shaped stopper 46 is formed in the joint fitting 45 connected to the lower portion of the cam 13, when the operation lever 12 is rotated in the left-right direction, it comes into contact with the guide pin 44 fixed to the joint pin 42, To operate within the range of angle θ as shown in the figure,
The rotation of the operation lever 12 is restricted. Also, the valve body
14 a pair of right and left pedals 58 _L, 58 _R provided for, as well as to be able to rotate back and forth direction pin 59 as the pivot center, the pedal 58 _L, 58 _R spring member 67 which is disposed on the lower surface side _F , 67 _R
Thus, the pedals 58 _L and 58 _R can be held at the neutral positions, respectively. Then, the elongated hole 63, 64 to the left pedal 58 _L, also formed long hole 65, 66 a in the longitudinal direction respectively in the right pedal 58 _R, the long hole 63, ~, the push rod 19 and 22 relative to 66, Two
0, 21 small diameter portions 60, respectively, and pedal 58
_L, 58 _R of the push rod 19 on the lower surface side, ~, respectively stepped portions 62 of the 22 so as to abut against.

Next, the function of the lever device 10 according to the present invention will be described. First, as a first case in which a lever operation is performed by the operation lever 12, straight traveling of the vehicle body will be described. When the operation lever 12 is tilted forward in the Y-axis direction, the push rods 19, 20 of the pilot valves 15, 16 are pushed in against the biasing force of the built-in spring. Since the pilot pressure inlet hole (not shown) of the shuttle S is open, the pilot pressure from the pilot pump 34 is introduced into the pilot valves 15 and 16. Then, the pilot secondary pressure acts on pilot pressure receiving portions 37 and 40 from pilot pressure deriving ports 28 and 29 via oil passages 49 and 50 (see FIG. 1), respectively. Therefore, in accordance with the pilot secondary pressure, the pilot switching valve 36 (hereinafter, switching valve 36) and the pilot switching valve 39 (hereinafter, switching valve 39) are switched from the neutral position to the positions A and A ', respectively. So hydraulic pump
The main pressure oils from 32 and 33 are supplied to the traveling motors 8 _L and 8 _R via the switching valves 36 and 39 at positions A and A ′ and oil passages 51 and 52, respectively. Since the traveling motors 8 _L and 8 _R both rotate forward, the vehicle body goes straight ahead. Next, when the operation lever 12 is tilted backward in the Y-axis direction, the pilot valve 1
The push rods 21 and 22 are pushed in against the biasing force of the built-in spring. The pilot secondary pressure is supplied from pilot pressure derivation ports 30 and 31 to oil passage 5 respectively.
Via 3,54, they act on pilot pressure receiving portions 41,38, respectively. Then, the switching valves 36 and 39 are operated to switch in the B-position and the B'-position, respectively. Therefore the main pressure oil from the hydraulic pump 32 and 33, respectively b position of the switching valve 36 and 39, b 'position, through the oil passage 55 and 56, are supplied to the traveling motor 8 _L, 8 _R. Since the traveling motor 8 _L, 8 _R performs reverse rotation together, the body performs post straight.

Next, as a second case of lever operation, a spin turn of the vehicle body will be described. When the operation lever 12 is in the upright state (
Operating lever 12
To the left (counterclockwise). The cam inclined surface 48 on the lower surface of the cam 13 pushes the push rods 20 and 22 of the pilot valves 16 and 18 together. Therefore, the pilot secondary pressure is derived from the pilot pressure deriving ports 29, 31 of the pilot valves 16, 18, respectively, and acts on the pilot pressure receiving parts 40, 38 of the switching valves 39, 36 via the oil passages 50, 54, respectively. . Then, the switching valves 39 and 36 are operated to switch between the a 'position and the B position. As a result, the right traveling motor _8R performs forward rotation, and the left traveling motor _8L performs reverse rotation. That is, when the operation lever 12 is operated to rotate left while standing upright, the vehicle body performs a left spin turn. Next, when the operating lever 12 is rotated rightward in the upright state, the pilot secondary pressures respectively from the pilot pressure deriving ports 28, 30 of the remote control valve 11, into which the push rods 19, 21 of the pilot valves 15, 17 are pushed, respectively. And act on the pilot pressure receiving portions 37 and 41 of the switching valves 36 and 39, respectively. Then, the switching valves 36 and 39 are operated to switch between the A position and the B 'position, respectively. As a result, the left traveling motor _8L performs forward rotation, and the right traveling motor _8R performs reverse rotation. That is, when the operation lever 12 is operated to rotate rightward while standing upright, the vehicle body performs a right spin turn.

Next, as a third case of lever operation, a pivot turn of the vehicle body will be described. There are four types of pivot turns: a left forward pivot turn, a right forward pivot turn, a right reverse pivot turn, and a left reverse pivot turn. here,
As an example, only the right forward pivot turn will be described. The operation lever 12 is tilted forward in the Y-axis and rotated right (clockwise). By the forward inclination of the operation lever 12, the push lots 21 and 22 of the pilot valves 17 and 18 are respectively cammed.
At the same time as the push rod 13 is not pushed, the cam inclined surface 48 of the cam 13 pushes only the push rod 19 of the pilot valve 15 by the right rotation of the operation lever 12. Therefore, the pilot secondary pressure is derived from the pilot pressure derivation port 28 of the pilot valve 15. The pilot secondary pressure is supplied from the pilot pressure derivation port 28 via the oil passage 49 to the switching valve 36.
Act on the pilot pressure receiving part 37 of. Then, only the switching valve 36 switches to the position A. Thereby the left running motor
Since only 8 _L in the forward rotation, do the right forward pivot turn. That is, when the operation lever 12 is tilted in the forward direction of the Y axis and turned clockwise, a right forward pivot turn is performed when the operation lever 12 is rotated counterclockwise, and a left forward pivot turn is performed when the control lever 12 is rotated counterclockwise. Further, when the operation lever 12 is tilted backward and rotated rightward on the Y axis, a right reverse pivot turn can be performed when the operation lever 12 is rotated leftward, and a left reverse pivot turn can be performed when the operation lever 12 is rotated leftward.

Next, as the case when performing a pedal operation by the pedal 58 _L, 58 _R, illustrating the vehicle body straight. When the pedals 58 _L and 58 _R are both depressed forward, the push rods 19 and 20 of the pilot valves 15 and 16 are pushed in against the biasing force of the built-in springs. Therefore, in this case, the operation state is the same as the forward tilting operation in the first case of the lever operation, and the vehicle body moves straight forward. When the pedals 58 _L and 58 _R are both depressed rearward, the push rods 21 and 22 of the pilot valves 17 and 18 are pushed in against the biasing force of the built-in springs. Therefore, in this case, the operation state is the same as the rearward tilting operation in the first case of the lever operation, and the vehicle body moves straight backward.

Next, a spin turn of the vehicle body will be described as a second case of pedal operation. Move the right pedal 58 _R forward and the left pedal 5
When 8 _L is simultaneously depressed to the rear side, the push rods 20, 22 of the pilot valves 16, 18 are pushed together. Therefore, the pilot secondary pressure is derived from the pilot pressure deriving ports 29, 31 of the pilot valves 16, 18, respectively, and acts on the pilot pressure receiving parts 40, 38 of the switching valves 39, 36 via the oil passages 50, 54, respectively. . Therefore, the switching valves 39 and 36 are in the a 'position,
Switching operation to the B position. As a result, the right traveling motor _8R performs forward rotation, and the left traveling motor _8L performs reverse rotation. That is, since the right crawler moves forward and the left crawler moves backward, a left spin turn of the vehicle body can be performed. And the front of the left pedal 58 _L to the reverse, and if depresses simultaneously right pedal 58 _R on the rear side, each push rod of the pilot valve 15, 17 19, 21
Is pushed. Pilot pressure outlet port of remote control valve 11
Pilot secondary pressures are respectively derived from 28 and 30 and act on pilot pressure receiving portions 37 and 41 of switching valves 36 and 39, respectively. Then, the switching valves 36 and 39 are operated to switch between the A position and the B 'position, respectively. As a result, the left traveling motor _8L performs forward rotation, and the right traveling motor _8R performs reverse rotation. That is, since the left crawler moves forward and the right crawler moves backward, a right spin turn of the vehicle body can be performed.

Next, a pivot turn of the vehicle body will be described as a third case of pedal operation. Of the four types of pivot turns, a rightward forward pivot turn will be described as an example. If depresses only the front left pedal 58 _L of the left and right pedals 58 _L, 58 _R, the left pedal 58 _L is Yuku only the push rod 19 of the pilot valve 15 in the I push. Therefore, the pilot secondary pressure is derived from the pilot pressure derivation port 28 of the pilot valve 15. The pilot secondary pressure is the pilot pressure derivation port
From 28, through the oil passage 49, the pilot pressure receiving part of the switching valve 36
Acts on 37. Then, only the switching valve 36 operates to switch to the position A. Because it only by the left travel motor 8 _L in the forward rotation, do the right forward pivot turn. In other words, only the right crawler performs forward or backward if depresses only left pedal 58 _L only the left crawler if depresses the front or rear performs forward or backward, also only right pedal 58 _R on the front side or rear side Therefore, a rightward forward, a rightward reverse, a leftward forward, and a leftward backward pivot turn are possible.

Effect of the Invention In the lever device with pedal according to the present invention, a forward / reverse switching pilot valve as a remote control valve is arranged, and a pair of left and right pedals is provided for a valve body of the pilot valve. Thereby, the forward / backward movement, spin turn, pivot turn, and the like of the vehicle body can be performed by one of the front and rear tilting operation, the left and right rotation operation of the operating lever, or the front and rear depressing operation of the left and right pedals, that is, by one-handed operation or two-footed operation of the driver. It can be carried out.

Since the lever device with pedal according to the present invention uses a pilot valve of a hydraulic remote control type, it can be easily operated with a light operating force. In addition, since the number of components is small and the structure is simple, the production cost is low and good operability and durability can be maintained.

[Brief description of the drawings]

1 is a structural view showing a lever device with a pedal according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a detailed view of a portion B of FIG. 1, and FIG. FIG. 5 is a side view of the main part as viewed from I in FIG. 3, FIG. 5 is a sectional view as viewed from JJ in FIG. 4, FIG. 6 is a bottom view as viewed from K in FIG. L in FIG.
-L, and FIG. 8 is a plan view taken along line MM (N-
FIG. 9 is a cross-sectional view as viewed from N), and FIG. 9 is a perspective view showing a conventional traveling operation device. 3 _L , 3 _R , 12… Operation lever 8 _L , 8 _R … Traveling motor 10… Lever device with pedal 13… Cam 14… Valve body 15, ∼ 18… Pilot valve 19, ∼ 22… Push rod 28, ∼ 31… Pilot pressure outlet port 36,39… Pilot switching valve 42… Joint pin 45… Joint bracket 46… Stopper 48… Cam inclined surface 58 _L , 58 _R … Pedal

Claims (1)

(57) [Claims] 1. A crawler vehicle in which left and right traveling motors are controlled by a traveling operation lever, a left and right forward switching pilot valve is disposed forward and a left and right reverse switching pilot valve is disposed rearward. To move forward and backward by tilting the lever back and forth, and to rotate the vehicle body by rotating the operation lever, and provide a pair of left and right pedals with respect to the valve body of the pilot valve,
Operate the left and right pedals forward or backward so that they move forward or backward. A lever device with a pedal, wherein the lever device is configured to perform a turning operation of a vehicle body by being operated.