JPS5889476A - Driver's stand lifter - Google Patents

Abstract

PURPOSE:To slide the back face onto a rail at any necessary instance, by forming the back face where the flange is symmetrical in the outer-diameter circumferential direction. CONSTITUTION:The rolling rotation which allows small random rolling in any direction between a rod 5 and a support 3 in the interval between a member 3b and a rotor 3a, while being produced by lifting a driver's stand will integrate the rod 5 and the rotor 3a when the rod 5 will contact against the wall face section of a hole 3n made in the rotor 3a and to rotate around the central axis of the holes 3k and 3j. Then the rod 5 will rotary roll around one axis which cross perpendicularly with at least the rod thereby the back face 5b of a flange 5a can enter into the rails 3e, 3e.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for lifting the cab of a cab-over type vehicle, which is required when the engine room of the vehicle is inspected or repaired.

In a cab-over type automobile, the driver's cab is provided above the engine room, so the driver's cab must be lifted up when inspecting or repairing the engine room.

Therefore, as the seven conventional cab lifting devices,
There is a method of using a hydraulic cylinder, but in this method, when the driver's cab is set in a normal state and the car is running, the hydraulic cylinder directly absorbs the vertical vibrations in the driver's cab. This results in deterioration of the ride comfort of the vehicle.

To solve this problem, so-called lost motion (lost motion) has been conventionally applied to the hydraulic (3) cylinder.
However, this configuration is complicated and expensive.

On the other hand, there is a method of mechanically disconnecting the driver's cab from the hydraulic cylinder to achieve this lost motion, but this conventional method involves fitting a pin orthogonally to the piston rod of the hydraulic cylinder. Since the pin is configured to selectively engage or disengage from an arcuate groove provided in the driver's cab, the piston rod is rotated around the rod axis so that the pin can be inserted into the bottle shoulder at a fixed position. There is the trouble of having to provide a detent to prevent the bottle from rotating, and since the contact between the bottle shoulder and the pin is a line contact, countermeasures against stress on the contact surface become an issue.

SUMMARY OF THE INVENTION An object of the present invention is to provide a driver's cab lifting device for an automobile that eliminates the above-mentioned problems.

To explain the present invention based on an embodiment, Fig. 1 (41) is a schematic side view of a case where a driver's cab lifting device as an embodiment of the present invention is attached to an automobile. , and FIG. 2 shows the support 3 in FIG. 1.
FIG. 3 shows a cross-sectional view taken along the line in FIG. 2. However, the piston rod (hereinafter simply referred to as rod) 5 in FIG.
The rod 5 in FIG. 3 shows the position after starting to lift the cab 5. As shown in FIG. , consists of a support 3 and a switching valve that operates a hydraulic actuator 4.
In FIG. 1, illustration of the switching valve is omitted for convenience of explanation.

In the embodiment of FIG. 1, the axial end 4a of the hydraulic actuator is pivotally connected to the chassis 2 of the vehicle, and the support 3
is fixed to the driver's cab 1, and in this configuration,
As the rod 5 extends upward, the driver's cab 1 can be tilted as shown in FIG. 1 about a fulcrum pivoted at the front of the chassis 2.

As shown in FIGS. 2 and 3, the structure of the support 3 is such that a bearing material 3m is fixed to the support 3, and holes 3 and 3j are formed in the bearing material 3m and the support 3, respectively. In this case, the rotor 3a is fitted into the hole 3 and slidably rotated around the center axis of the hole 3j, and the concave spherical bearing surface 3C cut into the rotor 3a is a convex spherical bearing surface. Member 3b forming 31
The rotor 3a is rotatably supported, and a hole 3d formed in the rotor 3b is fitted with a hole 3d to allow sliding movement in the axial direction of the hole. Holes 3 and 3 are provided on both sides of the space 3f that can swing and rotate about the axial center of the rotating rotor 3a, and on the upper side in the direction of the tensile force of the rotating rotor 3a in the state shown in FIG.
Rails 3e and 3e are provided, each forming a convex spherical surface centered at the intersection 3h of the central axis of the hole 3d and the central axis of the hole 3d.The rail 3e13e is fixed to the support 3. Note that 3p is a support member for preventing the member 3b from being pulled out, and 3q is a C ring.

The rod 5 has a shoulder 5c (Fig. 3) that selectively abuts the side end 3g of the member 3b, and a disk-shaped collar 5a is screwed onto the tip of the rod 5, and debris 5C on the collar 5a is screwed onto the tip. The rear surface 5b on the side forms a concave spherical surface having the same curvature as the above-mentioned convex spherical surface formed on the rails 3e, 3e.

To explain its operation in the above configuration, in the state shown in FIG. 2, that is, the rod 5 is in the shortest retraction Δ state, and at this time the driver's cab is returned to the position where the car is ready to be driven. In this state,
When a car is driven, the driver's cab 1 generally vibrates relative to the chassis 2, but in this case, the support 3 fixed to the driver's cab 1 freely moves vertically relative to the rod 5 at the hole 3d. The ride comfort resulting from this vibration is reduced by an independent device (7) with a shock absorber structure, which damps the vibration. It can be a big deal.

When inspecting or repairing the engine, etc. located at the bottom of the driver's cab 1 from the above-mentioned normal driving position, operate the hydraulic actuator 4 and extend the rod 5.
R2O in the rod 5 eventually comes into contact with the side end 3g as shown in FIG. The driver's cab 1 is lifted up as shown in FIG.

In this way, in the process of the rod 5 lifting the driver's cab 1, the center of gravity of the driver's cab 1 is tilted (counterclockwise around the pivot fulcrum in the state shown in FIG. 1). As it rotates in the direction, M 5 c supports it and pushes it up.

On the other hand, when the center of gravity moves beyond the vertical line (8) passing through the pivot center and moves to the left of the vertical line (Fig. It will try to rotate counterclockwise by itself, and after entering this state, the rod 5 must be able to support this movement of the driver's cab 1 in a tensile manner.

Hereinafter, when the center of gravity of the driver's cab 1 passes through the vertical line and tilts counterclockwise, the rod 5 is rotated clockwise relative to the support 3 about the intersection 3h in FIG. Rotate in the direction. In this case, as described above, the ri 45 is already kept in contact with the side edge 3g, and in this state, the center of gravity of the driver's cab 1 passes through the vertical line passing through the pivot center as described above. From a slightly forward position, the concave spherical surface of the back surface 5b slides into the rails 3e, 3e, which form part of the convex spherical surface, while the brim 5
a further rotates clockwise in Fig. 3 with the intersection point 3h as the center, and as the rod 5 further extends from this state, the weight of the driver's cab acts in the direction of pulling the rod 5, as described above. Therefore, when this state is entered, the rail 3e fixed to the driver's cab 1 is pressed against the back surface 5b by the gravity. As a result, the pressing force is supported by the hydraulic actuator 4 via the collar 5a and the rod 5, and the driver's cab 1 is tilted to a predetermined position.

In the above action, as a practical matter, between the rod 5 and the support 3, as the driver's cab 1 is tilted, the rod 5 is moved relative to the support 3 within the plane of FIG. The rod 5 not only rotates relatively clockwise, but also in a direction perpendicular to the plane of the paper in FIG.
must be capable of swinging to a certain degree of flatness relative to the support 3. This must take into account the relative installation error between the hydraulic actuator 4 and the support 3, and the lateral shaking of the driver's cab 1 when the driver's cab 1 is tilted by the hydraulic actuator 4 or when the vehicle is traveling. It is from.

Regarding this problem, in this embodiment, the member 3b has a spherical shape and the bearing surface 3C is configured to pivotally support the member 3b, so that the relative movement of the rod 5 with respect to the support 3 is as shown in the paper in FIG. The above-mentioned horizontal rotation is possible, and at the same time, free rocking other than horizontally is allowed, so that when lifting the driver's cab 1 or when the vehicle is running, the support 3 and the rod 5, there is no unreasonable movement at all.

In addition, in the above operation, instead of a configuration in which the rod 5 can rotate counterclockwise in the plane of FIG. This makes it possible not only to rotate the rod 5 in the counterclockwise direction, but also to perform rocking motion against escape such as the above-mentioned lateral vibration. The reason for the configuration is as follows.

That is, the surfaces of the bearing surfaces 3C and 31 may require a lubricant oil seal or a dust seal as necessary for the bearing, but in this case, the bearing surfaces 3C and 31 are spherical. Therefore, if the swing angle at the bearing surface is large, the seal may be easily damaged.

As a result, in order to deal with the above problem, in this example,
On the one hand, between the member 3b and the rotor 3a, the rod 5 is allowed to swing in any direction (approximately 5 degrees) in any direction between the rod 5 and the support 3, and on the other hand, the cab 1 is lifted up. The main large swinging rotation that occurs is caused by the rod 5 coming into contact with the wall surface of the perforation 3n formed in the rotor 3a, and after that contact, the rod 5 and the rotor 3a
are integrally configured to rotate around the central axis of the borehole 3 and 3j.

Note that the configuration that allows relative rocking between the rod 5 and the support 3 does not necessarily include the spherical member 3b as in the above embodiment.
The rotor 3a does not have to be pivotally supported by the rotor 3a, but it is also possible to use a universal joint-like structure in which two bottles are rotatably orthogonally supported.In short, between the support 3 and the hydraulic actuator 4, The basic condition of the present invention is that the rod 5 is at least perpendicular to the rod 5 with respect to the support 3. It is necessary that the rear surface 5b of the brim 5a enters into the rail 3es3e by rotating and swinging around the rail 3es3e. the result,
If the value of the oscillation that is allowed to be around 5 degrees is very small, a structure that allows the rotor 3a to slide in the perforation 3 or 3j in the axial direction may be used to prevent the oscillation. Therefore, even if the rotor 3a and the member 3b are configured as an integral rotating member, the end 4a of the hydraulic actuator 4 is pivotally connected to the chassis 2. It will be readily understood from the above description that, conversely, the end portion 4a may be pivoted to the driver's cab 1 side and the support 3 may be fixed to the chassis 2 side.

As is clear from the above description, in the cab lifting device of the present invention, in the configuration of the normal hydraulic actuator 4, the rod 5 can freely rotate around the axial center of the rod 5. , since the brim 5a forms a back surface 5b that is symmetrical in the outer circumferential direction of the rod 5, o-7
Even when the door 5 rotates around the axis, the shape of the back surface 5b relative to the rail 3e is always the same. As a result, even if the rod 5 is not provided with a complicated device such as a rotation stopper around the center of the axis, the back surface 5b can always slide onto the rails 3e and 3e when in the required position. This makes it even more possible.

Further, in the driver's cab lifting device according to the present invention, since the back surface 5b and the rails 3e, 3e have mutually spherical shapes,
The mutual contact during this sliding becomes surface contact, and as a result,
It has the advantage that the surface pressure at the contact can be made very small, making it easy to select the material for the collar 5a and/or the rails 3e, 3e, and because the surface pressure at the contact is reduced, It is also possible to appropriately reduce the frictional force in the contact by using an appropriate bearing material or the like.

In addition, in the driver's cab lifting device according to the present invention, when the rotor 3a is configured to pivotally support the spherical member 3b, in order to smoothly escape the horizontal shaking of the driver's cab 1, the support 3, This eliminates the risk of damaging the O-rad 5 or the hydraulic actuator 4 or reducing their durability.

[Brief explanation of the drawing]

FIG. 1 shows a schematic side view when a driver's cab lifting device according to an embodiment of the present invention is attached to an automobile, and FIG. 2 is a cross-sectional view of the support 3 in FIG. 1. , and FIG. 3 shows a cross-sectional view of Rollo in FIG. 2. The symbols used in the examples are as follows.
: Cab, 2: Chassis 3: Support 3a: Rotor, 3b: Member, 3C and 31: Bearing surface, 3d, 3 and 3j: Perforation, 3e: Rail, 3f: Space, 3g = Side end, 3h: intersection,
3m: bearing material, 3n: perforation. 4: Hydraulic actuator 4a = end. 5: Piston rod 5a: collar, 5b = back surface, 50: R patent applicant
Sanwa Seiki Co., Ltd. Representative Etsushi Nishikai Figure 3

Claims (1)

[Claims] 1. An end (4a) of a hydraulic actuator (4) is pivotally connected to either the driver's cab (1) or the chassis (2), and the A support (3) is fixedly installed on the other side, and the support has rotating members (3a, 3b) capable of rotating at least about an axis vertically erected to the side of the driver's cab. A perforation (3d) perpendicular to the - axis is provided in the rotating member.
a piston rod of the hydraulic actuator is fitted into the hole such that it can slide in the axial direction of the hole, and the piston rod between the rotating member and the hydraulic actuator has a a fixed M (50) that abuts the rotating member and lifts the driver's cab;
A collar (5a) is fixed to the piston rod on a side opposite to the side in the axial direction of the piston rod when viewed from the position of the rotary member, and a collar (5a) is fixed to the side opposite to the side of the rotary member in the axial direction of the piston rod. The supporting tool f is located in a part of the arc drawn around the - glaze in the rotating member, and is located on both sides of the glaze of the piston opening.
A rail (39, 3e) forming a convex spherical surface is provided, centered at the intersection 3h of the - glaze and the central axis of the perforation, and a back surface (5b) on the side of the brim.
A concave spherical surface portion having the same radius of curvature as the spherical surface is formed in the outer circumferential direction of the piston rod, and the back surface slides on the rail when the driver's cab is lifted. A driver's cab lifting device characterized by: 2. The rotating member has holes (3j,
The rotor (3a) is fitted to the rotor (3k) so that it can rotate and slide.
The driver's cab lifting device according to claim 1, wherein said member (3b) is provided with a swinging mechanism for said rotor.