JP2009286305A - Cab tilt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of parts and the man-hours for assembling a cab tilt device. <P>SOLUTION: A cylinder device 3 for tilting interposed between the cab and a frame and tilting the cab is composed of a ram type single acting cylinder device, one end of a supply/discharge oil path 11 is connected to a frame side end part of the cylinder 5, the other end of the supply/discharge oil path 11 is connected to a discharge port of a pump 13, and a suction port of the pump 13 is connected to a tank 14. A primary side discharge path 43 of a relief valve 15 is connected to the upstream side of the pump 13 in the supply/discharge oil path 11, and the secondary side discharge path 65 thereof is connected to the tank 14. An energizing force of a valve spring 56 of the relief valve 15 is composed to be variable. The relief valve 15 is set to the relief valve pressure by deflecting a valve spring 56 in tilt-up operation. The relief valve 15 is set less than the relief valve pressure by loosening the valve spring 56 in tilt-down operation. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a carbitol device.
For example, the present invention relates to a device that is effective when used for a cabbutylt device mounted on a cabover engine type automobile.

Medium and large cabover trucks are equipped with a cabylt unit so that inspection and maintenance of the engine portion can be easily performed.
In this cabylt device, a tilt cylinder device driven by an oil pump is interposed between the cab and the frame, and pressure oil is supplied by the oil pump to the oil passage on the raising side of the tilt cylinder device. Thus, the cab is lifted, and the cab is lowered when pressure oil is supplied to the lower oil passage.

  In the conventional cabylt device, a single rod type double acting cylinder device is used for the tilt cylinder device, and the oil pump has a directional switching valve for switching the operation direction of the double acting cylinder device, and a tilt cylinder device. There is a relief valve that regulates the maximum pressure.

  Since the conventional cabbutylt device uses a double-acting cylinder device, the number of parts and the number of assembling steps increase, resulting in an increase in size, weight, and cost.

  An object of the present invention is to provide a carbitol device that can reduce the number of parts and the number of assembling steps.

Typical means for solving the above-described problems are as follows.
A tilting cylinder device configured by a single-acting cylinder device and interposed between the cab and the frame to tilt the cab;
A supply / discharge oil passage connected to one end of a cylinder of the tilt cylinder device;
A pump connected to the other end of the supply / discharge oil passage;
A relief valve connected to the upstream side of the pump of the oil supply / discharge oil passage, connected to the tank on the secondary side, and configured to have a variable working pressure structure;
A carbylt device equipped with.

  According to the above means, the number of parts and the number of assembling steps can be reduced.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the carbitol device according to the present embodiment includes a tilt cylinder device 3. The tilt cylinder device 3 is interposed between the cab 1 and the frame 2, and the cab 1 is tilted by hydraulic expansion and contraction.
That is, the cab 1 is supported by the frame 2 so as to be rotatable in the front-rear direction by the fulcrum 1a, the upper end of the piston 4 of the tilt cylinder device 3 is pivotally attached to the cab 1, and the lower end of the cylinder 5 is The frame 2 is pivotably attached to the frame 2.
A cab lock device 6 is installed at the center of the rear end of the cab 1. The cab lock device 6 connects or disconnects the cab 1 and the frame 2.
That is, the cab 1 is connected to the rear arch 6a at the rear end by a rear arch 6a having a mountain shape, and a floating bar 6c is attached to the rear arch 6a via a coil spring or an air spring 6b. The cab lock device 6 connects the cab 1 to the floating bar 6c, and when the cab is tilted, the connection is released by the manual lever 6d.

As shown in FIG. 2, the tilt cylinder device 3 is configured as a ram type single-acting cylinder device, and the hydraulic drive circuit 10 includes a single supply / discharge oil passage 11.
One end of the supply / discharge oil passage 11 is connected to the frame side end of the cylinder 5 and circulates in the hydraulic chamber 5a. The other end of the supply / discharge oil passage 11 is connected to a discharge port of an oil pump (hereinafter referred to as a pump) 13 driven by a manual lever 12. The suction port of the pump 13 is connected to the tank 14.
A primary side of a relief valve (hereinafter referred to as a relief valve) 15 is connected to the upstream side of the pump 13 in the supply / discharge oil passage 11, and a secondary side of the relief valve 15 is connected to the tank 14. Yes.
A filter 16 is attached in the tank 14 to the suction side end of the pump 13. A relief valve 17 is installed in the tank 14.

As shown in FIG. 3, the pump 13 and the relief valve 15 are integrally assembled to the body 21.
A cylinder accommodation hole 22 is opened at one end of the body 21 (hereinafter referred to as the right end) so as to extend in the vertical direction (hereinafter referred to as the vertical direction). A cylinder 23 of the pump 13 is coaxially fitted (press-fitted). In the cylinder chamber 24 of the cylinder 23, the upper end portion of the piston 25 of the pump 13 is fitted so as to be slidable in the axial direction.
The lower end of the piston 25 protrudes below the body 21 and is interlocked with the manual lever 12 (see FIG. 2). The piston 25 is driven to advance and retract in the vertical direction by the manual lever 12.

The piston 25 is equipped with a suction valve 26. The suction valve 26 includes a valve chamber 27, and the valve chamber 27 is opened at the upper end portion of the piston 25. A valve port 28 is formed in the bottom wall of the valve chamber 27 so as to communicate with the inside of the valve chamber 27, and a valve seat 29 is formed in a circular ring shape at a connection portion between the valve port 28 and the valve chamber 27. . A valve body 30 made of a ball is accommodated in the valve chamber 27, and the valve body 30 opens and closes the valve port 28 by being seated on and away from the valve seat 29. The valve body 30 is always urged in the direction of seating on the valve seat 29 by a valve spring 31 formed of a compression taper coil spring.
On the center line of the piston 25, a suction path 32 that is a part of the supply / discharge oil path 11 is opened. One end of the suction path 32 communicates with the valve port 28, and the other end communicates with the tank 14 (see FIG. 2).

The cylinder 23 is equipped with a discharge valve 34.
The discharge valve 34 includes a valve chamber 35, and the valve chamber 35 is formed at the upper end of the cylinder 23. A valve port 36 is formed in the bottom wall of the valve chamber 35. The valve port 36 has an upper end communicating with the valve chamber 35 of the cylinder 23 and a lower end communicating with the valve chamber 27 of the piston 25. A valve seat 37 is formed in a circular ring shape at a connection portion between the valve port 36 and the valve chamber 35. A valve body 38 made of a ball is accommodated in the valve chamber 35, and the valve body 38 opens and closes the valve opening 36 by being seated on and off the valve seat 37. The valve body 38 is constantly urged in the direction of seating on the valve seat 37 by a valve spring 39 formed of a compression taper coil spring.

A fitting 40 is screwed into the opening of the cylinder accommodation hole 22, and the valve spring 39 takes a reaction force against the fitting 40.
On the center line of the fixture 40, a supply / discharge hole 41 constituting a part of the supply / discharge oil passage 11 is opened, and one end of the supply / discharge hole 41 communicates with the valve chamber 35 of the discharge valve 34. A pipe 42 constituting a part of the supply / discharge oil passage 11 is connected to the fixture 40, and the other end of the supply / discharge hole 41 communicates with the inside of the pipe 42.

As shown in FIG. 3, the body 21 is provided with a primary discharge passage 43 in an elbow shape at a portion adjacent to the cylinder accommodation hole 22, and one end of the discharge passage 43 is a side surface of the cylinder accommodation hole 22. It is open at.
As shown in FIGS. 3 and 4, a mounting hole 50 for mounting the relief valve 15 is formed in the left end surface of the body 21 in a direction crossing the pump 13, and at the bottom of the mounting hole 50. The other end of the discharge path 43 is open.

As shown in FIG. 4, a valve path member 51 is fitted into the bottom of the mounting hole 50, and an elbow-shaped valve path 52 is opened in the valve path member 51. One end of the valve path 52 communicates with the discharge path 43. A valve seat 53 is formed around the opening of the valve path 52 on the left end surface of the valve path member 51. A valve chamber 55 is formed in a portion of the mounting hole 50 adjacent to the valve path member 51. A valve body 54 made of a ball is housed in the valve chamber 55, and the valve body 54 opens and closes the valve seat 53 to open and close the valve passage 52.
A valve spring 56 and a spring seat 57 are accommodated in the valve chamber 55, and the valve spring 56 is always urged through the spring seat 57 in a direction in which the valve body 54 is seated on the valve seat 53.

A seal member 58 is fitted into the opening of the mounting hole 50, and a female screw portion 59 is formed on the inner periphery between the seal member 58 and the valve chamber 55. A pressure adjusting screw member 60 is inserted into the seal member 58, and a male screw portion 61 formed at the tip end portion of the pressure adjusting screw member 60 is screwed into the female screw portion 59 so as to freely advance and retract. The valve spring 56 exerts a reaction force on the pressure adjusting screw member 60. The pressure adjusting screw member 60 is supported by the seal member 58 so as to be rotatable and slidable.
One end portion of the pressure adjusting screw member 60 protrudes from the mounting hole 50, and a male screw portion 62 is formed at the protruding end portion. An operation handle / stopper (hereinafter referred to as a handle) 63 and a lock nut 64 are screwed into the male screw portion 62, and the handle 63 is fixed to the male screw portion 62 while being positioned by the lock nut 64. It has become. That is, the maximum circuit pressure (relief valve pressure) can be freely set by tightening the lock nut 64 after the male screw part is advanced and retracted.

  A secondary-side discharge path 65 is opened at a portion of the mounting hole 50 facing the valve chamber 55 in the body 21. One end of the discharge path 65 is connected to the valve chamber 55 and the other end is connected to the tank 14. (See FIG. 2).

  Next, the operation will be described.

At normal times such as when the truck is running, parked, and stopped, the relief valve 15 is in the state shown in FIGS. 2, 3, and 4.
As shown in FIG. 1, a lost motion lever 7 is interposed between the piston 4 of the tilt cylinder device 3 and the cab 1. For this reason, the vertical motion of the cab 1 when the truck is traveling on the road is absorbed by the lost motion lever 7. Therefore, a phenomenon in which the tilting cylinder device 3 becomes a resistance to free movement of the traveling cab 1 and deteriorates riding comfort can be prevented.

When the cab 1 is tilted up, the cab lock device 6 (see FIG. 1) is released by the manual lever 6d.
2 and 3, when the manual lever 12 is operated, the piston 25 moves up and down. When the piston 25 moves forward, the discharge valve 34 is closed and the suction valve 26 is opened to suck the oil in the tank 14 into the cylinder chamber 24. When the piston 25 returns, the suction valve 26 is closed, and the discharge valve 34 is opened against the valve spring 39 by the pressure in the cylinder chamber 24, and oil is sent out to the cylinder accommodation hole 22.

2 and 3, the oil sent to the cylinder accommodation hole 22 passes through the supply / discharge hole 41, the pipe 42 and the supply / discharge oil passage 11 and flows into the hydraulic chamber 5 a of the cylinder 5.
In FIG. 2, the oil flowing into the hydraulic chamber 5a lifts the cab 1 from the frame 2 and tilts it up by operating the piston 4 to extend.
Since the tilt cylinder device 3 according to the present embodiment is configured as a ram type single acting cylinder device, it is not necessary to discharge oil from the opposite side of the cylinder 5 at this time.

2 and 3, part of the oil in the cylinder accommodation hole 22 reaches the valve path 52 of the relief valve 15 through the discharge path 43 on the primary side.
At this time, the valve spring 56 of the relief valve 15 is bent toward the compression side by the pressure adjusting screw member 60 and is opened at the maximum circuit pressure (relief valve pressure), so that the relief valve 15 remains closed. .

2 and 3, when the operation of the manual lever 12 is stopped and the piston 25 is stopped, the valve body 38 of the discharge valve 34 is seated on the valve seat 37, so that the tilt cylinder device 3 can be shortened. It becomes impossible.
Also at this time, the valve spring 56 of the relief valve 15 is bent to the compression side by the pressure adjusting screw member 60 and is opened at the circuit maximum pressure (relief valve pressure), and the relief valve 15 remains closed. Therefore, the tilt cylinder device 3 cannot be shortened.
That is, the tilt cylinder device 3 supports the cab 1 that has been tilted up.

When the cab 1 is tilted down, the handle 63 is rotated and the pressure adjusting screw member 60 is pulled out as shown in FIG.
Since the urging force of the valve spring 56 against the valve body 54 is weakened by pulling out the pressure adjusting screw member 16, the relief valve 15 is opened. That is, the acting force by the hydraulic pressure of the hydraulic chamber 5 a of the tilt cylinder device 3 applied to the valve body 54 through the primary discharge passage 43 is superior to the resistance force of the valve spring 56 to the valve body 54.
As shown in FIG. 6, when the relief valve 15 is opened, the oil in the hydraulic chamber 5a of the tilt cylinder device 3 is supplied to the oil supply / discharge oil passage 11, the primary discharge passage 43, the relief valve 15 and the secondary side. Is discharged to the tank 14 via the discharge path 65.
Therefore, the piston 4 of the tilt cylinder device 3 can be shortened to tilt the cab 1 down.
In short, the relief valve 15 has a function as an open valve.

  After the cab 1 is tilted down to a predetermined position and the cab lock device 6 (see FIG. 1) is locked by the manual lever 6d, the handle 63 is rotated and the pressure adjusting screw member 60 is shown in FIGS. Insert as it is. When the handle 63 comes into contact with the body 21, the set pressure of the relief valve 15 returns to the maximum circuit pressure (relief valve pressure).

  According to the embodiment, the following effects can be obtained.

(1) By configuring the tilt cylinder device to be a ram type single-acting cylinder device, the mechanical structure and hydraulic circuit of the tilt cylinder device can be simplified, so the number of parts and assembly man-hours can be reduced. It is possible to reduce the size and weight and reduce the cost.

(2) The mechanical structure and hydraulic circuit of the cylinder device for tilt are configured by configuring the relief valve with a variable operating pressure structure and switching between supply and discharge of the supply / discharge oil passage of the ram type single-acting cylinder device. Can be further simplified.

(3) The structure can be further simplified by switching the urging force of the valve spring of the relief valve so that the relief valve has a variable operating pressure structure.

(4) By assembling the pump and the relief valve to the same body, the number of parts and the number of assembling steps can be further reduced.

  Needless to say, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  For example, the tilt cylinder device is not limited to a ram type single-acting cylinder device, but may be a piston type single-acting cylinder device.

  The pump is not limited to be driven manually, but may be driven by an electric motor, an engine, or the like.

  The variable operating pressure structure of the relief valve is not limited to be configured to switch the urging force of the valve spring of the relief valve.

  The pump and the relief valve are not limited to be assembled on the same body, but may be assembled and assembled separately.

  If necessary, the lost motion lever may be omitted.

It is a perspective view which shows the cab by which the carbylate apparatus and cab lock apparatus which are one embodiment of this invention are mounted. 1 is a hydraulic circuit diagram of a carbitol device according to an embodiment of the present invention. It is sectional drawing which shows the assembly of a pump and a relief valve. It is sectional drawing which shows a relief valve. It is sectional drawing which shows the relief valve at the time of tilt down. It is a hydraulic circuit diagram at the time of tilt down.

Explanation of symbols

1 ... cab, 1a ... fulcrum, 2 ... frame,
3 ... Cylinder device for tilt, 4 ... Piston, 5 ... Cylinder, 5a ... Hydraulic chamber,
6 ... cab lock device, 6a ... rear arch, 6b ... air spring, 6c ... floating bar, 6d ... manual lever,
7 ... Lost motion lever,
DESCRIPTION OF SYMBOLS 10 ... Hydraulic drive circuit, 11 ... Supply / discharge oil path, 12 ... Manual lever, 13 ... Pump, 14 ... Tank, 15 ... Relief valve (relief valve used as on-off valve), 16 ... Filter, 17 ... Relief valve, 21 ... Body 22 ... Cylinder housing hole, 23 ... Cylinder, 24 ... Cylinder chamber, 25 ... Piston, 26 ... Suction valve, 27 ... Valve chamber, 28 ... Valve port, 29 ... Valve seat, 30 ... Valve body, 31 ... Valve spring, 32 ... Suction passage, 34 ... Discharge valve, 35 ... Valve chamber, 36 ... Valve, 37 ... Valve seat, 38 ... Valve element, 39 ... Valve spring, 40 ... Fitting, 41 ... Supply / exhaust hole, 42 ... Piping, 43 ... discharge path (primary side),
DESCRIPTION OF SYMBOLS 50 ... Mounting hole, 51 ... Valve path member, 52 ... Valve path, 53 ... Valve seat, 54 ... Valve body, 55 ... Valve chamber, 56 ... Valve spring, 57 ... Spring seat, 58 ... Seal member, 59 ... Female thread part , 60 ... pressure adjusting screw member, 61 ... male screw part, 62 ... male screw part, 63 ... handle (operating handle and stopper), 64 ... lock nut, 65 ... discharge path (secondary side).

Claims (6)

A tilting cylinder device configured by a single-acting cylinder device and interposed between the cab and the frame to tilt the cab;
A supply / discharge oil passage connected to one end of a cylinder of the tilt cylinder device;
A pump connected to the other end of the supply / discharge oil passage;
A relief valve connected to the upstream side of the pump of the oil supply / discharge oil passage, connected to the tank on the secondary side, and configured to have a variable working pressure structure;
A carbylt device equipped with.   2. The carbitol device according to claim 1, wherein the relief valve is configured so that a biasing force of a valve spring is variable.   3. The cabylt device according to claim 1, wherein the tilt cylinder device is configured as a ram type single-acting cylinder device. 4.   The carbitol device according to claim 1, 2 or 3, wherein the pump is configured to be driven manually.   5. The carbitol device according to claim 1, wherein the pump and the relief valve are assembled in the same body.   The cabylt device according to claim 1, 2, 3, 4 or 5, wherein the relief valve has a function of an open valve.

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