JP2005280949A - Working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working machine simplifying the arranging work, the connection work or the like of a hydraulic pipe by reducing the length of the hydraulic pipe to connect a direction control valve to a hydraulic actuator. <P>SOLUTION: A vehicle body frame 3 consists of a pair of left longitudinal plate 4 and right longitudinal plate 5 which are separated from each other in right-to-left direction and extend in the longitudinal direction, and a bottom plate 6 to connect the left longitudinal plate 4 to the right longitudinal plate 5 in the right-to-left direction. A lever/valve assembly 31 is constituted by separating a first control valve device 33 from a second control valve device 43 in the longitudinal direction, and assembling them to a mounting plate 32 in advance. By mounting the mounting plate 32 of the lever/valve assembly 31 on the left longitudinal plate 4 of the frame 3, the control valve device 33 is arranged at the position close to a connection pin 7 (on the base end side of a boom) of a working device, and a control valve device 43 is arranged at the position close to a stabilizer mounting part 8 and a cylinder mounting part 9 of a vehicle body stabilizing device. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a work machine such as a hydraulic excavator, a crane, or a lift truck, and more particularly to a work machine configured to operate a work device with hydraulic pressure in order to perform a construction work or a cargo handling work.

  2. Description of the Related Art Generally, work machines such as lift trucks are provided so as to be able to undulate on the frame of a self-propelled vehicle body and the rear side of the frame, for example, to carry a load (load handling operation) from the ground to a high place. A telescopic working device that is expanded and contracted by a first hydraulic actuator, and a stabilizer device for stabilizing a vehicle body that is provided on the front side of the frame and is operated by a second hydraulic actuator (for example, , See Patent Document 1).

  The frame of the vehicle body is provided with a plurality of directional control valves respectively connected to the first and second hydraulic actuators via hydraulic pipes. These directional control valves can be operated, for example, by tilting an operation lever. Accordingly, the pressure oil from the hydraulic source is individually supplied to and discharged from the first and second hydraulic actuators to control the operation of the working device and the stabilizer device.

  In addition, a hydraulic excavator as a working machine according to another prior art is provided with a soil removal plate used as a vehicle body stabilization device in a lower traveling body, and a revolving frame mounted on the lower traveling body has earth and sand on its front side. It is set as the structure which provides the working device which performs the excavation work. In this case, the swivel frame is provided with a plurality of directional control valves that are respectively connected to a lifting cylinder that lifts and lowers the soil discharge plate and a hydraulic cylinder of the working device via hydraulic piping (for example, Patent Document 2).

  In this case, the plurality of directional control valves are stacked so as to overlap each other in the left and right directions of the vehicle, and are assembled as a single valve unit (multiple valve device). The valve unit is connected with a hydraulic pipe for each directional control valve in order to supply and discharge pressure oil to and from a hydraulic actuator such as an elevating cylinder or a hydraulic cylinder.

Japanese Patent No. 2559831 Japanese Utility Model Publication No. 5-40360

  By the way, in the above-described prior art, since a plurality of directional control valves are stacked so as to overlap each other and assembled as a single valve unit (multiple valve device), a plurality of directional control valves, hydraulic actuators, A plurality of hydraulic pipes connecting the two are complicatedly intertwined around the valve unit, and there is a problem that a great amount of labor and time are spent on the connection work of the hydraulic pipes.

  In addition, in a work machine such as a lift truck, a working device that is operated by a first hydraulic actuator is provided on the rear side of the frame of the vehicle body, and is operated by a second hydraulic actuator on the front side of the frame. A stabilizer device for stabilizing the vehicle body is provided.

  However, a plurality of directional control valves that control the supply and discharge of pressure oil to and from the first and second hydraulic actuators are arranged as a single valve unit (multiple valve device), for example, in the middle portion in the longitudinal direction of the frame. It is common to install.

  For this reason, the hydraulic piping connecting the first hydraulic actuator and the direction control valve needs to be extended from the position of the valve unit to the rear of the frame. In addition, the hydraulic piping connecting the second hydraulic actuator and the direction control valve also needs to be extended to the front of the frame for an excessively long time, and the work of drawing and connecting the hydraulic piping is complicated. There is.

  Also, when the hydraulic piping becomes long, it becomes easy for slack or the like to occur in the middle of the hydraulic pipe, and in order to prevent such slack in the hydraulic pipe, a pipe fastener or the like is provided in the middle of the length of the hydraulic piping. As a result, there is a problem that the number of parts increases, and the work of routing the hydraulic piping takes time and workability during assembly is reduced.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to reduce the length of the hydraulic piping connecting the directional control valve and the hydraulic actuator, and to route the hydraulic piping. It is an object of the present invention to provide a work machine that can simplify work, connection work, and the like, reduce the number of parts, and improve workability during assembly.

  In order to solve the above-described problems, the present invention provides a frame extending in the front and rear directions of a self-propelled vehicle body, a first hydraulic actuator provided on the rear side of the frame, and a front side of the frame. And a plurality of directional control valves that control the operation of each hydraulic actuator by supplying and discharging pressure oil to and from the first and second hydraulic actuators. .

  A feature of the configuration adopted by the invention of claim 1 is that the plurality of directional control valves include a first directional control valve that controls supply and discharge of pressure oil to and from the first hydraulic actuator, and the second directional control valve. Separated from the second directional control valve for controlling the supply and discharge of pressure oil to and from the hydraulic actuator, the directional control valves are arranged so as to have a positional relationship in the front and rear directions of the vehicle body. Of the directional control valves that are arranged, the first directional control valve is close to the rear position that is close to the first hydraulic actuator, and the second directional control valve is close to the second hydraulic actuator. The configuration is such that the front side position becomes the position.

  According to a second aspect of the present invention, the first hydraulic actuator operates a working device that is provided on the rear side of the frame and that can move up and down, and the second hydraulic actuator A stabilizer device for holding the vehicle body provided on the front side in a stable state is operated.

  According to a third aspect of the present invention, a tilt correction hydraulic cylinder for correcting left and right tilts of the vehicle body is provided on the front side of the frame, and pressure oil supply / discharge to the hydraulic cylinder is controlled. The directional control valve is arranged on the front side of the frame together with the second directional control valve.

  On the other hand, according to the invention of claim 4, the frame is composed of a pair of vertical plates that are spaced apart left and right and extend in the front and rear directions, and a bottom plate that connects the pair of vertical plates in the left and right directions. The first and second directional control valves are provided so as to be spaced apart in the front and rear directions on one of the pair of vertical plates.

  According to the invention of claim 5, the one vertical plate has a plurality of operation levers for individually switching the first and second directional control valves, and the operation levers are respectively connected to the first and second directional control valves. A plurality of operation transmission members are provided which are respectively connected to the second directional control valve and transmit the operation of each operation lever to the first and second directional control valves.

  According to a sixth aspect of the present invention, the one vertical plate has a plurality of operation levers for individually switching the first and second directional control valves, and a signal corresponding to the operation of each operation lever. And a plurality of signal transmissions for transmitting signals from the signal output means to the first and second directional control valves and for switching control of the first and second directional control valves. Means.

  Further, the invention according to claim 7 is configured such that the one vertical plate is provided with a driver's seat for an operator who operates the operation lever.

  As described above, the invention according to claim 1 divides the plurality of directional control valves into the first and second directional control valves that control the supply and discharge of the pressure oil to and from the first and second hydraulic actuators. The first directional control valve is disposed at a rear position close to the first hydraulic actuator, and the second directional control valve is a second hydraulic actuator in front of the first directional control valve. Therefore, the length of the hydraulic piping connecting between the first directional control valve and the first hydraulic actuator can be shortened, and the second directional control valve and the first directional control valve Similarly, the hydraulic pipe connecting the two hydraulic actuators can be surely shortened.

  As a result, it is possible to simplify the work of drawing and connecting the hydraulic piping to the first and second directional control valves. In addition, since each hydraulic pipe can be shortened, it is not necessary to provide pipe fasteners or the like in the middle of the length of each hydraulic pipe, and the number of parts can be reduced, and the work of routing the hydraulic pipe is included. Workability at the time of vehicle assembly can be improved.

  According to the second aspect of the present invention, the first hydraulic actuator operates the working device on the rear side of the frame, and the second hydraulic actuator operates the stabilizer device on the front side of the frame. By controlling the supply and discharge of the pressure oil to and from the first hydraulic actuator using the first directional control valve, the working device can be operated to be lifted up and down on the rear side of the frame. Further, by controlling the supply and discharge of the pressure oil to and from the second hydraulic actuator using the second directional control valve, the stabilizer device can be operated on the front side of the frame and the vehicle body can be held in a stable state. it can. And the length of the hydraulic piping connecting between the first directional control valve and the first hydraulic actuator (working device) can be shortened, the second directional control valve and the second hydraulic actuator (stabilizer device), Also for the hydraulic piping connecting between the two, the piping length can be surely shortened.

  According to a third aspect of the present invention, a hydraulic cylinder for tilt correction for correcting the tilt of the left and right sides of the vehicle body is provided on the front side of the frame, and the supply and discharge of pressure oil to and from the hydraulic cylinder is controlled. Since the directional control valve is arranged on the front side of the frame together with the second directional control valve, the directional control valve that controls the supply and discharge of the pressure oil to and from the hydraulic cylinder for tilt correction is provided in the second direction. Along with the control valve, it can be disposed near the front of the vehicle body and close to the hydraulic cylinder for inclination correction, and the length of the hydraulic piping connecting the directional control valve and the hydraulic cylinder can be shortened.

  On the other hand, in the invention according to claim 4, the frame is constituted by a pair of vertical plates and a bottom plate, and one of the pair of vertical plates has the first and second directional control valves at the front, In this case, the first directional control valve can be disposed near the rear part of the vehicle body and close to the work device, and the second directional control valve is disposed near the front part of the vehicle body. It can arrange | position in the position close | similar to a stabilizer apparatus.

  According to the invention described in claim 5, one of the pair of vertical plates has a plurality of operation levers for individually switching the first and second directional control valves, and each of the operation levers. Since a plurality of operation transmission members for transmitting the operation of the lever to the first and second directional control valves are provided, the plurality of operation levers and the operation transmission members are provided together with the first and second directional control valves. For example, mounting brackets or the like can be collectively attached to the vertical plate of the frame, and workability during assembly can be improved. Then, the tilting operation of the operation lever can be transmitted to the direction control valve via an operation transmission member (for example, a link mechanism or the like), and the switching operation of the direction control valve can be performed smoothly.

  According to the invention described in claim 6, since one of the pair of vertical plates is provided with a plurality of operation levers, a plurality of signal output means and a plurality of signal transmission means, Lever, signal output means and signal transmission means can be attached to the vertical plate of the frame together with the first and second directional control valves using, for example, mounting brackets, etc., improving workability during assembly can do. When any one of the plurality of operation levers is tilted, a signal corresponding to the operation of the operation lever can be output from the corresponding signal output means, and the signal transmission means transmits the signal at this time to the direction control valve. Thus, the directional control valve can be switched and controlled.

  Furthermore, according to the invention described in claim 7, since one of the pair of vertical plates is provided with a driver's seat for the operator who operates the operation lever, for example, the operator is seated in the driver's seat. In this state, the directional control valve can be switched by manually tilting the operation lever, and the supply / discharge control (operation) of the pressure oil to the hydraulic actuator can be performed smoothly.

  Hereinafter, a case where the working machine according to the embodiment of the present invention is applied to a lift truck will be described as an example, and will be described in detail with reference to FIGS. 1 to 11.

  Here, FIG. 1 to FIG. 10 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a lift truck as a work machine. The lift truck 1 is roughly constituted by a wheel-type vehicle body 2 capable of self-propelling and a work device 18 described later. The lift truck 1 performs, for example, a cargo handling operation for transporting cargo from the ground to a high place using the work device 18 after self-propelled to the work site.

  Reference numeral 3 denotes a frame serving as a base of the vehicle body 2. The frame 3 is formed of a thick steel plate or the like as shown in FIGS. The vertical plates 4 and 5 (the left vertical plate 4 and the right vertical plate 5) are formed using a thick steel plate or the like in the same manner as the vertical plates 4 and 5, and the space between the vertical plates 4 and 5 is left and right. A solid support structure (frame of the machine body) is configured by the bottom plate 6 and the like connected (joined) in FIG.

  A front wheel support 6A for supporting each front wheel 13 described later is provided on the front side of the bottom plate 6, and a rear wheel support 6B for supporting each rear wheel 15 described below is provided on the rear side of the bottom plate 6. Is provided. Further, on the rear side of the frame 3, a connecting pin 7 or the like is provided between the left vertical plate 4 and the right vertical plate 5 for attaching a boom 19 of a working device 18 described later so as to be able to be lifted and lowered.

  Reference numeral 8 denotes a stabilizer mounting portion provided on the front end side of the frame 3, and a stabilizer device 25, which will be described later, is pin-coupled to the stabilizer mounting portion 8 so as to extend in the left and right directions as shown in FIG. is there. The left vertical plate 4 of the frame 3 is provided with a cylinder mounting portion 9 at a position corresponding to the front wheel support portion 6A between the stabilizer mounting portion 8 and a device support portion 11 described later. Is a pin-coupled tilt correction cylinder 28 described later.

  Reference numerals 10 and 10 denote cab support portions provided on the left vertical plate 4 of the frame 3. The cab support portions 10 and 10 are front and rear intermediate portions of the left vertical plate 4 as shown in FIGS. Projects from the outside to the left (outward). Each cab support portion 10 supports a cab 16 described later via the left vertical plate 4 of the frame 3 together with a support seat 10 </ b> A provided on the inner side surface of the left vertical plate 4.

  Reference numeral 11 denotes a device support portion provided at an intermediate portion in the front and rear direction of the right vertical plate 5, and the device support portion 11 projects rightward from the right vertical plate 5, for example, heat from an engine, a radiator or the like as a prime mover. An exchange device and other devices (both not shown) are supported from below. A device cover 12 and the like are provided on the device support 11 as shown in FIG. 1, and the device cover 12 is opened and closed during maintenance and inspection of the engine.

  Reference numerals 13 and 13 denote left and right front wheels which are rotatably provided on the front side of the frame 3 via an axle housing 14 and the like. The left and right front wheels 13 and 13 are axle housings as shown in FIG. 14 is attached to both the left and right ends of 14 via an axle or the like. The left and right front wheels 13 travel and drive the vehicle body 2 together with a rear wheel 15 to be described later when a rotational driving force from a traveling hydraulic motor (not shown) is transmitted through an axle or the like. The left and right front wheels 13 and 13 are steered by four wheels together with a rear wheel 15 by a steering handle (not shown) disposed in a cab 16 described later, and control the traveling direction of the vehicle body 2. It is.

  Here, the axle housing 14 is attached to the bottom plate 6 of the frame 3 so as to be swingable in the left and right directions via a support pin (not shown) on the lower surface of the front wheel support portion 6A. The axle housing 14 has a function of correcting the tilting of the frame 3 of the lift truck 1 in the left and right directions together with a tilt correction cylinder 28 described later.

  Reference numeral 15 denotes a left and right rear wheel (only one is shown in FIG. 1) rotatably provided on the rear side of the frame 3 via an axle housing or the like. These left and right rear wheels 15 are also provided on the axle housing. The axle housing in this case is rotatably mounted on both the left and right ends through axles and the like, and the axle housing in this case is also supported by the rear wheel support portion 6B of the bottom plate 6 through a support pin (not shown) so as to be swingable. ing. The left and right rear wheels 15 receive the rotational driving force from the traveling hydraulic motor via an axle or the like, and drive the vehicle body 2 together with the front wheels 13. Further, the left and right rear wheels 15 are steered together with the front wheels 13 by the steering wheel, and control the traveling direction of the vehicle body 2.

  Reference numeral 16 denotes a cab that constitutes an operation operation unit of the lift truck 1. The cab 16 is connected to the left vertical plate 4 of the frame 3 via the cab support part 10 as shown by a two-dot chain line in FIGS. 2 to 5. It is installed and defines a cab inside. The cab 16 is provided with a driver's seat 17 (described later) on which an operator is seated, a steering handle (not shown), a correction lever 49 (described later), operating levers 51, 52, 55, 62, 63, and the like. Yes.

  Reference numeral 17 denotes a driver seat provided in the cab 16, which is attached to the left vertical plate 4 of the frame 3 via a floor plate (not shown) of the cab 16 as shown in FIG. is there. An operator getting on and off the cab 16 manually tilts operation levers 51, 52, 55, 62, 63, which will be described later, while being seated on the driver's seat 17, for example.

  18 is a work device for cargo handling work provided on the rear side of the vehicle body 2 so as to be able to be lifted and lowered. As shown in FIG. 1, the work device 18 has a boss portion 19A on the base end side of the frame 3 (vertical plates 4, 5). ) Boom 19 which is connected to the upper end of the rear part via a connecting pin 7 (see FIG. 2) so as to be able to move up and down, and extends forward and rearward. The fork 20 as a loading / unloading work tool is generally configured.

  The boom 19 is composed of a plurality of (for example, three) extendable booms. Further, a boom hoisting cylinder 21 illustrated in FIG. 10 is provided between the frame 3 and the boom 19. The boom hoisting cylinder 21 is supplied with pressure oil from a hydraulic pump 71 (described later) via a direction control valve 36. By being discharged, the boom 19 moves up and down around the connecting pin 7 shown in FIG.

  Reference numeral 22 denotes a boom telescopic cylinder provided in the working device 18, and this boom telescopic cylinder 22 is provided outside the boom 19 as shown in FIG. 1, and expands and contracts the telescopic boom 19 described above in the length direction. Is. Further, a fork cylinder 23 (see FIG. 10) as a working tool cylinder is provided between the tip of the boom 19 and the fork 20, and the fork cylinder 23 raises the fork 20 on the tip side of the boom 19. , Which rotates downward.

  Here, the boom hoisting cylinder 21, the boom telescopic cylinder 22, the fork cylinder 23, and the like constitute a first hydraulic actuator that operates the work device 18. These cylinders 21, 22, and 23 are expanded and contracted by supplying and discharging pressure oil from the hydraulic pump 71 through directional control valves 36, 37, and 38 described later shown in FIG. 10.

  Reference numeral 24 denotes a vehicle body stabilization device provided on the front side of the vehicle body 2. The vehicle body stabilization device 24 includes left and right stabilizer devices 25 attached to the stabilizer mounting portion 8 of the frame 3 as shown in FIG. 25 and an inclination correction cylinder 28, which will be described later, for correcting the inclination of the vehicle body 2 in the left and right directions.

  Here, the left and right stabilizer devices 25, 25 are attached to the front side of the frame 3 via the stabilizer attachment portion 8, and the left and right stabilizer cylinders 26, 26 and the left and right ground plates 27, 27 and the like.

  Then, the stabilizer device 25 extends each stabilizer cylinder 26 as shown in FIG. 1 at the time of cargo handling work using the work device 18, etc., so that the stabilizer device 25 protrudes left and right from the stabilizer mounting portion 8. To the ground. Further, when the stabilizer cylinder 26 is contracted, the ground plate 27 of the stabilizer device 25 is greatly raised upward from the ground, and the stabilizer device 25 is prevented from becoming an obstacle when the vehicle is traveling.

  Reference numeral 28 denotes an inclination correcting hydraulic cylinder (hereinafter referred to as an inclination correcting cylinder 28) attached to the right vertical plate 5 of the frame 3 via a cylinder attaching portion 9. The inclination correcting cylinder 28 is a front wheel as shown in FIG. It abuts on the 13th axle housing 14 so as to be extendable and contracted, and performs tilt correction (frame leveling) in the left and right directions of the frame 3.

  That is, when the lift truck 1 stops on an inclined ground (for example, an inclined ground where the vehicle tilts left and right), the frame 3 of the vehicle body 2 tilts left and right together with the axle housing 14 and the like on the front wheel 13 side. There is. However, in this case, the axle housing 14 is attached to the front wheel support portion 6A of the bottom plate 6 so as to be swingable in the left and right directions via the support pins and the like.

  For this purpose, if the tilt correction cylinder 28 is appropriately expanded and contracted between the frame 3 and the axle housing 14, the frame 3 (bottom plate 6) side of the vehicle body 2 is opposed to the axle housing 14 in a state tilted by an inclined ground. It can be swung so as to be relatively inclined in the left and right directions, whereby the inclination of the vehicle body 2 can be corrected.

  A fuel tank 29 is provided on the rear side of the frame 3 as shown in FIG. 1. The fuel tank 29 is attached to the rear side of the right vertical plate 5 constituting a part of the frame 3 from the side. . The fuel tank 29 is formed, for example, as a hollow container having a substantially rectangular shape made of a high-strength synthetic resin material, and supplies fuel to the engine in the device cover 12.

  Reference numeral 31 denotes a lever / valve assembly which is attached to the left vertical plate 4 of the frame 3. The lever / valve assembly 31 includes an attachment plate 32 and a first control valve device 33, which will be described later, as shown in FIGS. (Directional control valves 36-39), second control valve device 43 (directional control valves 46-48), correction lever 49, link mechanism 50, operation levers 51, 52, 55, 62, 63 and link mechanisms 53, 54. , 56, 59 to 61, and the like.

  8 and 9, the lever / valve assembly 31 includes control valve devices 33 and 43, a correction lever 49, a link mechanism 50, operation levers 51, 52, 55, 62 and 63, and a link mechanism 53, With 54, 56, 59 to 61 and the like attached to the attachment plate 32 in advance, the attachment plate 32 is used to detachably attach to the left vertical plate 4 of the frame 3.

  In this case, the correction lever 49 and the operation levers 51, 52, 55, 62, and 63 of the lever / valve assembly 31 protrude from the upper end of the mounting plate 32 into the cab 16 as shown in FIGS. And is tilted manually by an operator who has entered the cab 16.

  The first and second control valve devices 33 and 43 are provided to be separated from each other in the front and rear directions of the left vertical plate 4 (mounting plate 32). It is arranged at a position close to the connecting pin 7 (the base end side of the boom 19). Further, the second control valve device 43 located on the front side of the first control valve device 33 is disposed at a position close to the vehicle body stabilization device 24 (stabilizer mounting portion 8 and cylinder mounting portion 9).

  Reference numeral 32 denotes a mounting plate constituting a bracket of the lever / valve assembly 31. The mounting plate 32 is formed in a flat plate shape using a steel plate or the like as shown in FIGS. It extends in the forward and backward directions. The mounting plate 32 is formed to have a length dimension of about 100 to 130 cm in the front and rear directions and a width dimension of about 50 to 70 cm in the upper and lower directions, and the plate thickness is about 4 to 8 mm. It has become.

  Here, as shown in FIG. 7, the mounting plate 32 has control valve mounting portions 32A and 32B positioned on both sides in the front and rear directions, and an intermediate link mounting portion 32C positioned between the control valve mounting portions 32A and 32B. And a lever mounting portion 32D located above the link mounting portion 32C.

  The mounting plate 32 of the lever / valve assembly 31 is detachably installed on the inner side surface of the left vertical plate 4 (the right side surface of the left vertical plate 4 as viewed from the rear of the vehicle) using an installation bolt 66 described later. The At this time, the control valve mounting portion 32A of the mounting plate 32 is disposed at a position near the rear portion of the vehicle, and the other control valve mounting portion 32B is disposed at a position near the front portion of the vehicle.

  Reference numeral 33 denotes a first control valve device provided in the control valve mounting portion 32A of the mounting plate 32. The control valve device 33 includes lower and upper joint plates 34 and 35 as shown in FIGS. A total of four first directional control valves 36, 37, 38, 39 arranged so as to overlap each other between the joint plates 34, 35 in a stacked state.

  As illustrated in FIG. 7, the joint plates 34 and 35 and the directional control valves 36 to 39 of the control valve device 33 that are overlapped with each other on the upper and lower sides have their side surfaces (left side when viewed from the rear of the vehicle). In a state of abutting with the control valve mounting portion 32A of the mounting plate 32, the control valve mounting portion 32A is fixed to the control valve mounting portion 32A with a bolt or the like.

  Here, the control valve device 33 connects the direction control valves 36 to 39 using a parallel circuit as shown in FIG. 10, and the center bypass conduit 33A is connected to a hydraulic pump 71 (described later) with a pump conduit 40 and the like. Connected through. The direction control valve 36 of the control valve device 33 supplies and discharges the pressure oil from the hydraulic pump 71 to the boom hoisting cylinder 21 of the work device 18 to control the operation (extension / contraction) of the boom hoisting cylinder 21.

  Further, the direction control valve 37 of the control valve device 33 supplies and discharges the pressure oil from the hydraulic pump 71 to the boom telescopic cylinder 22 and causes the boom 19 to extend and contract in the length direction by the boom telescopic cylinder 22. Further, the direction control valve 38 of the control valve device 33 supplies and discharges the pressure oil from the hydraulic pump 71 to the fork cylinder 23, and rotates the fork 20 shown in FIG. It is.

  In this case, a level cylinder 41 is connected to the fork cylinder 23 in parallel with the direction control valve 38 as shown in FIG. The level cylinder 41 automatically corrects the attitude of the fork 20 with respect to the hoisting operation of the boom 19 shown in FIG. 1 by expanding and contracting following the boom hoisting cylinder 21.

  As a result, the fork 20 of the working device 18 is tilted forward and rearward by the level cylinder 41 so that the tip of the fork 19 remains substantially horizontal even when the boom 19 is moved up and down. It is corrected. Further, the directional control valve 39 of the control valve device 33 supplies and discharges the pressure oil from the hydraulic pump 71 to the spare hydraulic cylinder 42 shown in FIG.

  43 is a second control valve device provided in the control valve mounting portion 32B of the mounting plate 32. The control valve device 43 includes lower and upper joint plates 44 and 45, as shown in FIGS. It is comprised by the 2nd direction control valves 46 and 47 and the direction control valve 48 which are arrange | positioned so that it may overlap between the joint plates 44 and 45 in the laminated state.

  The joint plates 44 and 45 of the control valve device 43 and the direction control valves 46 to 48, which are overlapped with each other in the upward and downward directions, have their side surfaces (left side as viewed from the rear of the vehicle) on the control valve of the mounting plate 32. In a state where it abuts on the mounting portion 32B, the control valve mounting portion 32B is fixed to the control valve mounting portion 32B with a bolt or the like. Further, the direction control valves 46 to 48 and the like of the control valve device 43 are arranged along a virtual line AA inclined obliquely by an angle α with respect to a line perpendicular to the vehicle as shown in FIG. Has been placed.

  Here, the control valve device 43 connects the direction control valves 46 to 48 using a parallel circuit as shown in FIG. 10, and the center bypass conduit 43 </ b> A is connected to the first via a hydraulic pipe 69 described later. The control valve device 33 is connected to the center bypass conduit 33A. Then, the direction control valves 46 and 47 of the control valve device 43 supply and discharge the pressure oil from the hydraulic pump 71 to the left and right stabilizer cylinders 26 and 26, and control the operation (extension / contraction) of each stabilizer cylinder 26. To do.

  Further, the direction control valve 48 of the control valve device 43 supplies and discharges the pressure oil from the hydraulic pump 71 to the inclination correction cylinder 28, and expands and contracts the inclination correction cylinder 28 up and down. The inclination correction cylinder 28 stabilizes the posture of the vehicle body 2 on, for example, an inclined ground by correcting the inclination of the vehicle body 2 shown in FIG.

  Reference numeral 49 denotes an operation lever for tilt correction (hereinafter referred to as a correction lever 49) provided so as to be tiltable on the lever mounting portion 32D of the mounting plate 32. The correction lever 49 is manually operated in the direction of arrow a shown in FIG. Is tilted. The correction lever 49 is connected to the direction control valve 48 via a link mechanism 50 as an operation transmitting member, and switches the direction control valve 48.

  Reference numerals 51 and 52 denote stabilizer operation levers (hereinafter referred to as stabilizer operation levers 51 and 52) which are provided rearwardly from the correction lever 49 and can be tilted to the lever attachment portion 32 </ b> D of the attachment plate 32. The levers 51 and 52 are attached close to each other in the left and right directions as shown in FIG. 9, and are manually tilted independently of each other in the direction indicated by the arrow b.

  The stabilizer operation levers 51 and 52 are connected to the direction control valves 46 and 47 via link mechanisms 53 and 54 as operation transmission members, and the direction control valves 46 and 47 are individually switched and operated. The left and right stabilizer devices 25, 25 shown in FIG. Further, when the vehicle operator tilts the stabilizer operation levers 51 and 52 collectively, for example, the left and right stabilizer devices 25 and 25 are evenly extended.

  Reference numeral 55 denotes a spare operating lever that is positioned behind the stabilizer operating levers 51 and 52 so as to be tiltable to the lever mounting portion 32D of the mounting plate 32. The operating lever 55 is a first control valve device 33. 10 is connected to a directional control valve 39 through a link mechanism 56 as an operation transmitting member, and is tilted forward and backward (for example, in the direction indicated by an arrow b in FIG. 9), thereby providing a reserve hydraulic pressure shown in FIG. The cylinder 42 and the like are operated.

  Reference numerals 57 and 58 denote lever supports provided between the correction lever 49 and the stabilizer operation levers 51 and 52 and provided in the lever attachment portion 32D of the attachment plate 32. The lever supports 57 and 58 are described later. The levers 62 and 63 are tilted leftward and rightward and forward and backward, respectively.

  In this case, the lever supports 57 and 58 are tilted in the same direction independently from each other when the operation levers 62 and 63 are tilted in the forward and backward directions (for example, the direction indicated by the arrow b in FIG. 9). The However, when the operation levers 62 and 63 are tilted in the left and right directions (for example, the direction indicated by the arrow a in FIG. 9), the lever supports 57 and 58 are integrally tilted in the same direction. It is assembled like this. The lever supports 57 and 58 are provided with cylindrical stopper portions 57A and 58A into which a lock lever 64 described later is removably fitted.

  Reference numerals 59, 60 and 61 denote link mechanisms as operation transmission members attached to the link attachment portion 32C of the attachment plate 32. The link mechanisms 59 to 61 are provided between the lever supports 57 and 58 and the direction control valves 36 to 38. Among them, the link mechanism 59 transmits the tilting operation in the front and rear directions (for example, the direction indicated by the arrow b in FIG. 9) of the lever support body 58 to the direction control valve 36.

  Further, the link mechanism 60 transmits to the direction control valve 37 the tilting operation of the lever supports 57 and 58 in the left and right directions (for example, the direction indicated by the arrow a in FIG. 9). The link mechanism 61 transmits the forward / backward tilting operation of the lever support 57 to the direction control valve 38.

  Reference numerals 62 and 63 denote a pair of left and right operating levers provided on the lever supports 57 and 58 between the correction lever 49 and the stabilizer operating levers 51 and 52, and one of the operating levers 62 and 63 is provided. The operation lever 62 is fixedly attached to the lever support 57 and is connected to the direction control valve 37 via the link mechanism 60 and is connected to the direction control valve 38 via the link mechanism 61.

  Further, the other operation lever 63 is fixedly attached to the lever support 58 as shown in FIG. 9 and is connected to the direction control valve 36 via the link mechanism 59, and the lever support 57 and the link mechanism 60 are connected to each other. It is also connected to the direction control valve 37 via

  For this reason, if the operator of the vehicle tilts the operation lever 62 or the control lever 63 leftward or rightward, the tilting operation is transmitted to the direction control valve 37 via the lever support 57 and the link mechanism 60 in any case. It is done. As a result, the direction control valve 37 is switched, and the boom telescopic cylinder 22 shown in FIG. 10 is expanded and contracted.

  When the operator tilts the operation lever 63 forward and backward, the tilt operation is transmitted to the direction control valve 36 via the lever support 58 and the link mechanism 59, and the boom hoisting cylinder 21 shown in FIG. Telescopic operation. When the operator tilts the operation lever 62 forward and backward, this tilting operation is transmitted to the direction control valve 38 via the lever support 57 and the link mechanism 61, and the fork cylinder 23 shown in FIG. It is to be operated.

  Reference numeral 64 denotes a lock lever constituting a lock mechanism for restricting the tilting operation of the operation levers 62 and 63. The lock lever 64 is provided between the correction lever 49 and the operation levers 62 and 63 as shown in FIGS. And is attached to a lever attachment portion 32D of the attachment plate 32 via a support arm 65.

  The lock lever 64 is inserted into (engaged with) the stopper portions 57A and 58A of the lever supports 57 and 58 at the lock position shown in FIG. The tilting is controlled. When the lock lever 64 is pulled up in the direction indicated by the arrow c in FIG. 8, the lever support members 57 and 58 are tilted by the operation levers 62 and 63 by releasing the engagement with the stopper portions 57A and 58A. It is allowed to be rolled.

  Here, the correction lever 49 and the operation levers 51, 52, 55, 62, 63 of the lever / valve assembly 31 are oblique to each other as shown in FIGS. 7 and 8 in consideration of the operability of the operator in the cab 16. As shown in FIG. 7, the upper end of the frame 3 is arranged so as to be inclined rearwardly along a virtual line BB inclined by an angle β with respect to a line horizontal to the vehicle. Yes. The link mechanisms 50, 53, 54, 56, 59 to 61 are linked so that their link connecting portions (rotation points) are substantially perpendicular, and the direction control valves 46 to 48 and the direction control valves 36 to 36 are connected. The spools 39 (not shown) are arranged so as to be substantially collinear with each other.

  As a result, the link mechanisms 50, 53, 54, 56, 59 to 61 apply the operation force of the correction lever 49 and the operation levers 51, 52, 55, 62, and 63 to the direction control valves 46 to 48 and the direction control valves 36 to 39, respectively. Can be efficiently transmitted to each of the spools, and an equal amount of spool movement can be secured with respect to the reciprocating lever stroke when the correction lever 49 and the operation levers 51, 52, 55, 62, 63 are tilted. . For this purpose, the second control valve device 43 (direction control valves 46 to 48) is disposed obliquely along the virtual line AA as shown in FIG.

  66, 66,... Are installation bolts for attaching the lever / valve assembly 31 to the left vertical plate 4 of the frame 3, and these installation bolts 66 are included in the left vertical plate 4 as shown in FIGS. The mounting plate 32 of the lever / valve assembly 31 is detachably fastened to the left vertical plate 4 by being screwed to screw seats 67 and 68 provided on the side surfaces.

  In this case, a gap S (for example, about 20 to 30 mm) is provided between the mounting plate 32 of the lever / valve assembly 31 and the left vertical plate 4 as shown in FIGS. The gap S has a function of radiating heat from the control valve devices 33, 43 and the like to the outside via the mounting plate 32.

  69 and 70 are hydraulic pipes connecting the first and second control valve devices 33 and 43 of the lever / valve assembly 31, and the hydraulic pipes 69 and 70 are first pipes as shown in FIGS. 10 is provided between the control valve device 33 and the second control valve device 43, and one of the hydraulic pipes 69 is connected to the center bypass conduit 43A of the control valve device 43 as shown in FIG. To the center bypass pipe line 33A.

  Further, the other hydraulic pipe 70 has a low-pressure side pipe portion 43B downstream of the direction control valve 48 in the center bypass pipe 43A shown in FIG. To connect. The hydraulic pipe 70 is connected to the tank 72 via a hydraulic pipe 73 described later.

  71 is a hydraulic pump that constitutes a hydraulic power source together with a tank 72. This hydraulic pump 71 is located between the vertical plates 4 and 5 shown in FIG. It is rotationally driven by an engine (not shown). Further, the tank 72 is provided on the lower side of the cab 16, for example, located outside the left vertical plate 4. Then, as shown in FIG. 10, the hydraulic pump 71 sucks the hydraulic oil in the tank 72 and discharges the high-pressure oil into the pump line 40, and this pressure oil causes the direction control valves 36 to 39 and 46 to 48 to be discharged. The cylinders 21 to 23, 42, 26, 28 and the like are supplied to and discharged from the cylinders.

  73 is another hydraulic pipe provided between the low pressure side pipe line part 43B of the control valve device 43 and the tank 72. The hydraulic pipe 73 is also connected to the low pressure side pipe line part 33B of the control valve apparatus 33. Etc., and these low pressure side pipe sections 33B and 43B are connected to the tank 72.

  The lift truck 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, when an operator who has entered the cab 16 of the lift truck 1 starts the engine while seated in the driver's seat 17, the hydraulic pump 71 and the like are driven to rotate. The pressure oil discharged from the hydraulic pump 71 is supplied to and discharged from, for example, a traveling hydraulic motor (not shown) to drive the rear wheels 15 and the like, and the steering wheel is operated to steer the front wheels 13. By doing so, the lift truck 1 can be self-propelled to a work site or the like.

  Further, when the lift truck 1 (vehicle) is driven, the left and right stabilizer devices 25 and 25 shown in FIG. 1 are lifted upward in advance, and the respective grounding plates 27 are separated greatly from the ground, thereby driving the vehicle. The stabilizer device 25 is prevented from getting in the way.

  Next, when a load (not shown) or the like is loaded on the fork 20 of the work device 18 at the work site, the operator in the cab 16 grasps the lock lever 64 and pulls it up in the direction indicated by the arrow c in FIG. The engagement of the lock lever 64 with the stopper portions 57A, 58A of the lever supports 57, 58 is released, whereby the lever supports 57, 58 can be tilted by the operation levers 62, 63.

  In this state, the fork 20 is arranged so as to be inserted under the luggage by slowly moving the vehicle in the direction of the luggage. At this time, when the operator in the cab 16 manually tilts the operating lever 62, the tilting operation of the operating lever 62 is transmitted to the direction control valve 38 via the lever support 57 and the link mechanism 61.

  Thereby, the direction control valve 38 can be switched from the neutral position illustrated in FIG. 10, and the pressure oil from the hydraulic pump 71 can be supplied to and discharged from the fork cylinder 23 to drive the cylinder 23 in the extending direction. Then, by slightly extending the fork cylinder 23, for example, the fork 20 is rotated slightly upward at the front end side of the working device 18 shown in FIG. 1, and the load is loaded in a stable state on the upper side of the fork 20. be able to.

  Further, for example, when the work site is an inclined ground or the like, if the operator in the cab 16 tilts the correction lever 49 that is an operation lever for tilt correction, the correction lever 49 is connected via the link mechanism 50. The direction control valve 48 can be switched. Then, by switching the direction control valve 48, the pressure oil from the hydraulic pump 71 can be supplied to and discharged from the inclination correction cylinder 28, and the inclination correction cylinder 28 is expanded and contracted on the axle housing 14 on the front wheel 13 side shown in FIG. Further, tilt correction (frame leveling) in the left and right directions of the frame 3 can be performed.

  In addition, when a cargo handling operation for lifting a load upward (high place) using the work device 18 with the load loaded on the fork 20 is performed, the vehicle may fall down due to the weight of the load. May receive external force. In order to prevent the vehicle from falling, it is necessary to arrange the left and right stabilizer devices 25 and 25 so as to protrude left and right by the respective stabilizer cylinders 26 as shown in FIG.

  Therefore, in such a case, the operator in the cab 16 tilts the stabilizer operating levers 51 and 52 to transmit the operating force at this time to the direction control valves 46 and 47 via the link mechanisms 53 and 54. On the other hand, the left and right stabilizer cylinders 26, 26 are driven in the extending direction by switching the direction control valves 46, 47.

  As a result, each stabilizer device 25 of the lift truck 1 is driven in the left and right directions by the stabilizer cylinder 26 as shown in FIG. 1, and the grounding plate 27 can be grounded to the ground. The vehicle body 2 can be held in a stable state, and the vehicle body 2 can be prevented from falling over.

  Next, when the work device 18 is operated with the vehicle body 2 stabilized in this manner, the operator in the cab 16 with the lock lever 64 released in advance as described above, for example, moves the operation lever 63 forward and backward. 10 is transmitted to the direction control valve 36 via the lever support 58 and the link mechanism 59, the boom hoisting cylinder 21 shown in FIG. Can be raised and lowered up and down.

  When the operator inside the cab 16 tilts the operation lever 62 or the operation lever 63 leftward or rightward, in any case, the tilting operation is transmitted to the direction control valve 37 via the lever support 57 and the link mechanism 60. At this time, by switching the direction control valve 37, the boom telescopic cylinder 22 shown in FIG. 10 can be expanded and contracted, and the boom 19 of the work device 18 can be expanded and contracted in the longitudinal direction.

  Further, when the operator tilts the operation lever 62 forward and backward, this tilting operation is transmitted to the direction control valve 38 via the lever support 57 and the link mechanism 61, whereby the fork cylinder 23 shown in FIG. The fork 20 can be rotated up and down on the front end side of the working device 18, and for example, the luggage loaded on the fork 20 as described above can be transported to an appropriate place (unloading place). can do.

  After the unloading of the load is completed, the operator in the cab 16 tilts the operating lever 62 or the operating lever 63 to contract the boom 19 of the work device 18 and tilts the operating lever 63. For example, the boom 19 can be pivoted downward (lowered), and the working device 18 can be placed on the frame 3 as shown in FIG.

  Thus, according to the present embodiment, the first control valve device 33 (direction control valves 36 to 39), the second control valve device 43 (direction control valves 46 to 48), the correction lever 49, the operation lever 51, 52, 55, 62, 63 and link mechanisms 50, 53, 54, 56, 59-61, etc. are assembled in advance to the mounting plate 32 as shown in FIGS. ing.

  The lever / valve assembly 31 preliminarily assembled in this way is attached to the left vertical plate 4 of the frame 3 by using a plurality of installation bolts 66 and the like from the inside using the mounting plate 32 as shown in FIGS. Since it is configured to be detachable, the control valve devices 33, 43, the correction lever 49, the operation levers 51, 52, 55, 62, 63 and the link mechanisms 50, 53, 54, 56, 59 to the frame 3 of the vehicle body 2 are provided. Installation work of 61 etc. can be performed efficiently.

  That is, since the pre-assembled lever / valve assembly 31 is attached to the left vertical plate 4 of the frame 3 via the attachment plate 32, the operation of attaching the direction control valve to the frame and the operation of attaching the operation lever as in the prior art. Need not be done separately. Then, the control valve devices 33, 43, the correction lever 49, the operation levers 51, 52, 55, 62, 63 and the like are attached to the frame simply by attaching the mounting plate 32 of the lever / valve assembly 31 to the left vertical plate 4 of the frame 3. 3 can be assembled together and workability during assembly can be improved.

  Since the link mechanism 50, 53, 54, 56, 59 to 61, etc. are pre-assembled on the mounting plate 32 of the lever / valve assembly 31, when the lever / valve assembly 31 is assembled, For example, it is possible to easily check the operation of the direction control valves 36 to 39 and 46 to 48 with respect to the tilting operation of the correction lever 49 and the operation levers 51, 52, 55, 62, and 63.

  In this case, the link mechanisms 50, 53, 54, 56, 59 to 61 and the like assembled to the link attachment portion 32C of the attachment plate 32 are finely adjusted to smoothly adjust the movement of each link. Can do. By using these link mechanisms 50, 53, 54, 56, 59 to 61, etc., the movements of the directional control valves 36 to 39 and 46 to 48 can be finely adjusted. For example, it can be easily performed using a wide work space such as an assembly factory.

  That is, adjustment work for smooth movement of the link mechanisms 50, 53, 54, 56, 59 to 61, etc. can be easily performed with a wide working space at the assembly stage of the lever / valve assembly 31. The movements of the direction control valves 36 to 39 and 46 to 48 can be easily finely adjusted.

  The lever / valve assembly 31 finely adjusts the movement and the like of the direction control valves 36 to 39 and 46 to 48 and then the left vertical plate 4 with respect to the left vertical plate 4 of the frame 3 using the mounting plate 32. It can be attached to the inner surface of the vehicle body so as to be fastened with the installation bolts 66 from the lateral direction (left, right direction), the work of attaching the vehicle body 2 to the frame 3 can be performed smoothly, and the workability at the time of assembly is improved. Can be improved.

  The lever / valve assembly 31 includes a link mechanism 50, 53, 54, 56, 59 to 61 and the like, a correction lever 49, operation levers 51, 52, 55, 62, 63, a first control valve device 33 (direction). Since the control valve 36 to 39) and the second control valve device 43 (direction control valves 46 to 48) are assembled to the single mounting plate 32, the entire lever / valve assembly 31 is formed compactly. And errors during assembly can be kept small.

  In the present embodiment, the first control valve device 33 including the first directional control valves 36 to 39, the second directional control valves 46 and 47, and the second directional control valve 48 are included. A control valve device 43 is provided so as to be separated from each other in the front and rear direction of the left vertical plate 4 via the mounting plate 32, and the first control valve device 33 is connected to the connection pin 7 (the base of the boom 19) of the work device 18. The second control valve device 43 is arranged at a position close to the vehicle body stabilization device 24 (stabilizer mounting portion 8 and cylinder mounting portion 9).

  For this reason, while being able to shorten the length of each hydraulic piping provided by connecting between the first control valve device 33 (direction control valves 36 to 39) and the respective cylinders 21 to 23, 41 and 42 of the work device 18, The lengths of the hydraulic pipes connected between the second control valve device 43 (direction control valves 46 to 48) and the cylinders 26 and 28 of the vehicle body stabilization device 24 can be reliably shortened.

  In addition, one hydraulic pipe connected to the first control valve device 33 (direction control valves 36 to 39) is connected to each cylinder 21 to 23, 41, 42 of the work device 18 in order to connect the control valve device 33. The other hydraulic piping routed rearward from the position and connected to the second control valve device 43 (direction control valves 46 to 48) is connected to the cylinders 26 and 28 of the vehicle body stabilization device 24. The control valve device 43 is routed forward from the position.

  Accordingly, the hydraulic pipes routed in this way are linked mechanisms 50, 53, 54, 56, 59 arranged between the direction control valves 36 to 39 and the direction control valves 46 to 48, for example, as shown in FIG. No contact with or interference with ˜61 etc., and pulsation of pressure oil flowing in the hydraulic piping can be prevented from adversely affecting the movement of the link mechanisms 50, 53, 54, 56, 59˜61. , The movement of each link can be stabilized.

  Further, in the present embodiment, one hydraulic pipe that connects between the first control valve device 33 and each of the cylinders 21 to 23, 41, 42 of the work device 18, the second control valve device 43, and the vehicle body Since the other hydraulic pipe connecting between the cylinders 26 and 28 of the stabilization device 24 can be formed in a short length, a pipe fastener (not shown) or the like used for a portion in the length direction of each hydraulic pipe is provided. It is possible to reduce the number of parts by reducing the number of parts, and it is possible to simplify the work of routing the hydraulic piping and the like, which can also improve the workability at the time of vehicle assembly.

  Moreover, according to the present embodiment, the first and second control valve devices 33, 43, the correction lever 49, the operation levers 51, 52, 55, 62, 63 and the link mechanisms 50, 53, 54, 56, 59 ˜61 etc. are pre-assembled on one mounting plate 32 to constitute the lever / valve assembly 31, thereby assembling the control valve devices 33, 43 and the operation levers 51, 52, 55, 62, 63, etc. Work can be performed efficiently, and workability during vehicle assembly can be greatly improved.

  The left vertical plate 4 to which the lever / valve assembly 31 is attached is provided with a cab 16 on which an operator gets on and off, and a correction lever 49, operation levers 51, 52, 55, 62, 63 and the like are provided in the cab 16. For example, an operator who is in the cab 16 and sits in the driver's seat 17 manually tilts the correction lever 49 and the operation levers 51, 52, 55, 62, and 63, thereby controlling the direction control valve. 36 to 39 and 46 to 48 can be switched, and pressure oil supply / discharge control (operation) for each of the cylinders 21 to 23, 26, 28 and 42 can be performed smoothly.

  Further, since the mounting plate 32 of the lever / valve assembly 31 is provided with a lock lever 64 and the like for restricting the operation of the operation levers 62 and 63, the control valve devices 33 and 43 and the operation levers 51, 52, The lock lever 64 can be incorporated into the lever / valve assembly 31 composed of 55, 62, 63, etc. to make the whole compact, and when the lock lever 64 is operated, the operation levers 62, 63 are erroneously operated. Can be regulated, operational safety can be ensured, and reliability can be improved.

  Next, FIG. 11 shows a second embodiment of the present invention, and the feature of this embodiment is that a directional control valve is switched using a hydraulic pilot type operation valve. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, 81 is a lever / valve assembly employed in the present embodiment, and the lever / valve assembly 81 is configured in substantially the same manner as the lever / valve assembly 31 described in the first embodiment. The mounting plate 82 serving as the bracket is provided with first and second control valve devices 83 and 90 which will be described later, and pressure reducing valve type pilot operation valves 96, 99, 100, 105, 108, 109 and the like. .

  The mounting plate 82 of the lever / valve assembly 81 is configured in substantially the same manner as the mounting plate 32 described in the first embodiment. However, in this case, the mounting plate 82 is provided with control valve mounting portions 82A and 82B located on both sides in the front and rear directions, and an operation valve mounting portion 82C located on the upper side.

  Reference numeral 83 denotes a first control valve device provided in the control valve mounting portion 82A of the mounting plate 82. The control valve device 83 is configured in substantially the same manner as the control valve device 33 described in the first embodiment, The lower and upper joint plates 84 and 85 have a total of four first directional control valves 86, 87, 88 and 89 disposed in a stacked state between the joint plates 84 and 85. However, the control valve device 83 in this case is different in that the direction control valves 86 to 89 are constituted by hydraulic pilot type direction control valves.

  Reference numeral 90 denotes a second control valve device provided in the control valve mounting portion 82B of the mounting plate 82. The control valve device 90 is configured in substantially the same manner as the control valve device 43 described in the first embodiment, Lower and upper joint plates 91 and 92, and second directional control valves 93 and 94 and a directional control valve 95 disposed between the joint plates 91 and 92 in a stacked state. However, the control valve device 90 in this case is different in that the direction control valves 93 to 95 are constituted by hydraulic pilot type direction control valves.

  Reference numeral 96 denotes a pilot operation valve as a signal output means provided in the operation valve mounting portion 82C of the mounting plate 82. The pilot operation valve 96 includes a correction lever 49 (for tilt correction) described in the first embodiment. A correction lever 97 substantially the same as the operation lever) is provided so as to be tiltable. The output side of the pilot operation valve 96 is connected to the direction control valve 95 via a pair of pilot pipes 98A and 98B as signal transmission means.

  The pilot operating valve 96 controls the direction according to the tilting operation of the correction lever 97 by supplying the pilot pressure as a signal according to the tilting operation of the correction lever 97 to the direction control valve 95 via the pilot pipes 98A and 98B. The valve 95 is switched.

  Reference numerals 99 and 100 denote pilot operation valves as other signal output means provided in the operation valve mounting portion 82C of the mounting plate 82. The pilot operation valves 99 and 100 include the operation lever described in the first embodiment. Operation levers 101 and 102 substantially the same as 51 and 52 are provided so as to be tiltable. Further, the output side of the pilot operation valve 99 is connected to the direction control valve 93 via pilot pipes 103A and 103B as signal transmission means, and the output side of the pilot operation valve 100 is a pilot pipe 104A as signal transmission means. It is connected to the direction control valve 94 via 104B.

  The pilot operation valves 99, 100 supply the pilot pressure as a signal according to the tilting operation of the operation levers 101, 102 to the direction control valves 93, 94, thereby controlling the direction control valves 93, 94. The switching operation is performed according to the tilting operations 101 and 102.

  Reference numeral 105 denotes a pilot operation valve as another signal output means provided in the operation valve attachment portion 82C of the attachment plate 82. The pilot operation valve 105 is substantially the same as the operation lever 55 described in the first embodiment. The operation lever 106 is provided so that it can be tilted. The output side of the pilot operation valve 105 is connected to the direction control valve 89 via pilot pipes 107A and 107B as signal transmission means.

  The pilot operation valve 105 supplies the pilot pressure as a signal according to the tilting operation of the operation lever 106 to the direction control valve 89 via the pilot pipes 107A and 107B, thereby controlling the direction according to the tilting operation of the operation lever 106. The valve 89 is switched.

  Reference numerals 108 and 109 denote pilot operation valves as other signal output means provided in the operation valve mounting portion 82C of the mounting plate 82. The pilot operation valves 108 and 109 include the operation lever described in the first embodiment. Operation levers 110 and 111 substantially the same as 62 and 63 are provided so as to be tiltable.

  Further, the output side of the pilot operation valve 108 is connected to the direction control valve 88 via pilot pipes 112A and 112B as signal transmission means, and the direction is controlled through pilot pipes 113A and 113B as signal transmission means. Connected to valve 87. Further, the output side of the pilot operation valve 109 is connected to the direction control valve 86 via pilot piping 114A and 114B as signal transmission means, and is also connected to the direction control valve 87 via pilot piping 113A and 113B. ing.

  The pilot operation valves 108 and 109 supply pilot pressures as signals to the direction control valves 88 and 86 when the operation levers 110 and 111 are tilted forward and backward, respectively. When switching operation is performed individually and the operation levers 110 and 111 are tilted to the left or right, in any case, the pilot pressure according to the tilting operation is supplied to the direction control valve 87 and the direction control valve 87 is switched. To do.

  Thus, also in the present embodiment configured as described above, the first control valve device 83 including the direction control valves 86 to 89 and the second control valve device 90 including the direction control valves 93 to 95 are attached. By adopting a configuration in which the frame 3 (the left vertical plate 4) is provided in the front and rear directions so as to be separated from each other via the plate 82, substantially the same operational effects as those of the first embodiment can be obtained.

  In particular, in this embodiment, pilot pipes 98A, 98B, 103A, and pilot control valves 96, 99, 100, 105, 108, 109 as signal output means and directional control valves 86-89, 93-95 are connected. The link mechanisms 50, 53, 54, 56, and 59 to 61 described in the first embodiment can be made unnecessary by connecting them via 103B, 104A, and 104B.

  In the second embodiment, the directional control valves 86 to 89 and 93 to 95 are hydraulic pilot type directional control valves, and the pilot operation valves 96, 99, 100, 105, 108, 109 are used as signal output means. The case of using is described as an example. However, the present invention is not limited to this. For example, the directional control valve may be an electromagnetic proportional control valve, and an electric lever or the like may be used as the signal output means.

  In the first embodiment, the case where the link mechanisms 50, 53, 54, 56, 59 to 61 are used as the operation transmitting member of the lever / valve assembly 31 has been described as an example. However, the present invention is not limited to this. For example, an operation transmission member made of a push-pull wire or the like may be used to transmit the operation of the operation lever to the direction control valve.

  On the other hand, in the first embodiment, as an example, the first and second control valve devices 33 and 43 are assembled to the mounting plate 32 of the lever / valve assembly 31 separately in the front and rear directions. I gave it as an explanation. However, the present invention is not limited to this. For example, the first and second control valve devices 33 and 43 are separated from the left vertical plate 4 of the frame 3 in the front and rear directions by omitting the mounting plate. It is also possible to use a structure that can be directly assembled. This point is the same as in the second embodiment.

  Moreover, in each said embodiment, the lift truck 1 used for a cargo handling work etc. was mentioned as an example and demonstrated as a working machine. However, the present invention is not limited to this. For example, a work machine including a work device that operates a hydraulic actuator by switching a direction control valve with an operation lever, such as a hydraulic excavator, a hydraulic crane, and a wheel loader. Can be widely applied. And, for example, in the case where a working device such as a boom or an arm is provided in front of the vehicle body, such as a hydraulic excavator, and a traveling device and a turning device are provided behind the working device, the direction control valve for the working device is provided on the vehicle body. What is necessary is just to set it as the structure which arrange | positions to the front side of this and arrange | positions the traveling device and the direction control valve for turning devices in the back.

1 is a perspective view showing a lift truck according to a first embodiment of the present invention. FIG. 2 is a perspective view showing a vehicle body frame, a lever / valve assembly, and the like with the front wheels, rear wheels, and vehicle body stabilization device in FIG. 1 removed. FIG. 3 is a plan view of the frame, lever / valve assembly and the like in FIG. 2 as viewed from above. FIG. 4 is an enlarged view of a main part showing the lever / valve assembly and the like in FIG. 3 in an enlarged manner. FIG. 5 is a cross-sectional view of the lever / valve assembly and the like seen from the direction of arrows V-V in FIG. 4. It is a perspective view shown in the state where the lever and valve assembly is attached to the left vertical plate of the frame. It is a front view which expands and shows the lever and valve assembly in FIG. It is a front view which shows the lever and valve assembly in FIG. 7 as a single unit. FIG. 9 is a perspective view of the lever / valve assembly shown in FIG. 8. FIG. 3 is a hydraulic circuit diagram showing a hydraulic pump, a plurality of directional control valves, each cylinder of the working device, and the like. It is a front view which shows the lever and valve assembly by 2nd Embodiment.

Explanation of symbols

1 Lift truck (work machine)
2 Car body 3 Frame 4 Left vertical plate 5 Right vertical plate 6 Bottom plate 7 Connecting pin 8 Stabilizer mounting portion 9 Cylinder mounting portion 10 Cab support portion 11 Equipment support portion 13 Front wheel 14 Axle housing 15 Rear wheel 16 Cab 17 Driver's seat 18 Working device 19 Boom 20 fork (loading work implement)
21 Boom hoisting cylinder (hydraulic actuator)
22 Boom telescopic cylinder (hydraulic actuator)
23 Fork cylinder (hydraulic actuator)
25 Stabilizer device 26 Stabilizer cylinder (hydraulic actuator)
28 Tilt correction cylinder (hydraulic cylinder)
31, 81 Lever / valve assembly 32, 82 Mounting plate (bracket)
33, 83 First control valve device 36-39, 86-89 First direction control valve 41 Level cylinder (hydraulic actuator)
42 Spare hydraulic cylinder (hydraulic actuator)
43, 90 Second control valve device 46, 47, 93, 94 Second direction control valve 48, 95 Direction control valve 49, 97 Correction lever (control lever for tilt correction)
50, 53, 54, 56, 59 to 61 Link mechanism (operation transmission member)
51, 52, 101, 102 Stabilizer operation lever 55, 106 Spare operation lever 57, 58 Lever support 62, 63, 110, 111 Work operation lever 64 Lock lever (lock mechanism)
66 Installation bolt 67, 68 Screw seat 69, 70, 73 Hydraulic piping 71 Hydraulic pump 72 Tank 96, 99, 100, 105, 108, 109 Pilot operation valve (signal output means)
98A, 98B, 103A, 103B, 104A, 104B, 107A, 107B, 112A, 112B, 113A, 113B, 114A, 114B Pilot piping (signal transmission means)

Claims (7)

A frame extending in the front and rear direction of the self-propelled vehicle body, a first hydraulic actuator provided on the rear side of the frame, a second hydraulic actuator provided on the front side of the frame, In a working machine comprising a plurality of directional control valves for controlling the operation of each hydraulic actuator by supplying and discharging pressure oil to and from the second hydraulic actuator,
The plurality of direction control valves include a first direction control valve that controls supply and discharge of pressure oil to and from the first hydraulic actuator, and a second direction that controls supply and discharge of pressure oil to and from the second hydraulic actuator. Separated from the control valve, each directional control valve is arranged so as to have a positional relationship in the front and rear directions of the vehicle body,
Of the directional control valves arranged in the front and rear directions, the first directional control valve is at a rear position close to the first hydraulic actuator, and the second directional control valve is at the first position. 2. A work machine characterized by being arranged so as to be located at a front side position close to the hydraulic actuator of No. 2.   The first hydraulic actuator operates a lifting / lowering working device provided on the rear side of the frame, and the second hydraulic actuator stabilizes the vehicle body provided on the front side of the frame. The work machine according to claim 1, wherein the stabilizer is configured to operate a stabilizer device for maintaining the state.   A tilt correction hydraulic cylinder that corrects the left and right tilts of the vehicle body is provided on the front side of the frame, and the direction control valve that controls the supply and discharge of pressure oil to and from the hydraulic cylinder is the second control valve. The work machine according to claim 1, wherein the work machine is configured to be disposed on a front side of the frame together with the directional control valve.   The frame includes a pair of vertical plates that are spaced apart left and right and extend in the front and rear directions, and a bottom plate that connects the pair of vertical plates in the left and right directions, and the first and second directions. 4. The work machine according to claim 1, wherein the control valve is configured to be provided on one vertical plate of the pair of vertical plates so as to be separated in the front and rear directions.   The one vertical plate is connected to a plurality of operation levers for individually switching the first and second direction control valves, and the operation levers are connected to the first and second direction control valves, respectively. The work machine according to claim 4, wherein a plurality of operation transmission members that transmit the operation of each operation lever to the first and second directional control valves are provided.   The one vertical plate has a plurality of operation levers for individually switching the first and second directional control valves, and a plurality of signal output means for outputting signals corresponding to the operations of the operation levers. And a plurality of signal transmission means for transmitting signals from the signal output means to the first and second directional control valves and for switching and controlling the first and second directional control valves. 4. A work machine according to 4.   The work machine according to claim 4, 5 or 6, wherein the one vertical plate is provided with a driver's seat for operating the operation lever.

Images