JPS58101876A - Cab raising device - Google Patents

Abstract

PURPOSE:To simplify the structure and improve the durability by slidably engaging a rod of a hydraulic actuator with a member which is fit to the supporting element of a cab via a rotor and by providing a contact member for the rod so as to elevate the rotor. CONSTITUTION:A rotor 3a is muouted via bearing members 3m and 3n to a supporting element 3 which is secured to a cab 1. A member 3b having a convex spherical bearing face 3i si sliidably pivoted to a concave spherical bearing face 3c of a bearing member 3r which is fit inside a drilled hole 3a of the rotor 3a. A rod 5 of hydraulic actuator 4 for raising the cab 1 is fit in the drilled hole 3d of the member 3b in the axially silidable relation. A rail 3e having a concave spherical face is stuck to the supporting element 3. A contact member 5a which comes into contact with the side face end 3g of the rotor 3a when the cab 1 is inclined is threadably engaged with the rod 5, the back face 5b of the contact member 5a having th convex spherical face. When the cab 1 is tilted, the back face 5b of the convex spherical face may slide on said rail 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, conventional techniques have been used to provide the hydraulic cylinder with so-called zero stroke motion (lost motion).
) is employed to escape the vibrations, but this structure is complicated and expensive.

To deal with this, there is a method of mechanically separating the connection between the driver's cab and the hydraulic cylinder as a configuration for performing the zero stroke motion, but considering the mechanism to escape the horizontal shaking of the driver's cab in these conventional methods. I haven't. As a result, if the lifting device is lifted according to the conventional concept that does not take such measures against escape, a serious problem arises in that the lifting device is damaged or its durability is deteriorated.

An object of the present invention is to provide a driver's cab lifting device that improves the above-mentioned problems.

To explain the present invention based on an embodiment, FIG. 1 shows a side view of a driver's cab lift H position as an embodiment of the present invention when it is installed in an automobile. Fig. 2 shows a cross-sectional view of the support 3 in Fig. 1, and Fig. 3 shows a cross-sectional view of Rollo in Fig. 2. , piston rod (hereinafter simply referred to as rod) 5
shows the state in which the hydraulic actuator 4 is most retracted.

As shown in FIG. 1, the cab lifting device according to the present invention is composed of a hydraulic actuator 4, a rod 5 in the hydraulic actuator 4, a support 3, and a switching valve for operating the hydraulic actuator 4. In FIG. 1, illustration of the switching valve is omitted for convenience of explanation.

In the first embodiment shown in FIG. 1, the axial end 4a of the hydraulic actuator is pivotally connected to the chassis 2 of the automobile, and the support 3 is fixed to the driver's cab 1. In such a configuration, As the rod 5 extends up, the driver's cab 1 moves to the chassis 2.
The front part f is designed to be able to tilt as shown in Figure 1, centering on a pivot point.

The structure of the support 3 is as shown in FIGS. 2 and 3. Bearing holes 3m and 3n are fitted into holes 3j and 3 formed on both sides of the support 3, respectively.
I! The holes 3B and 3t+ drilled in holes 3B and 3n, respectively, are rotatable and slidable around the axis of the holes 3A and 3P is drilled in the direction perpendicular to the axis of the holes 3B and 3T. A bearing material 3r is fitted into the perforated hole 3p, and the concave spherical bearing surface 30 formed by cutting into the bearing material 3r has a member 3b forming a convex spherical bearing surface 31. , is pivotally supported so as to be swingable, and a hole 3d drilled in part O 3b has a hole 3d.
There are recesses on both sides of the space 3f, into which the rod 5 is fitted so as to be able to slide in the axial direction of the borehole 3d, and in which the rod 5 rotates and swings together with the rotor 3a around the axial center of the rotor 3a. Rails 3e, 3e having a spherical rail surface shape are fixedly installed, and the center of the concave spherical surface is aligned with the rotation center of the rotor 3a and the perforation 3d.
It coincides with the intersection point 3h with the center of the axis.

The rod 5 has a shape that is symmetrical in the outer circumferential direction of the rod 5.
In addition, a contact member 5a is screwed into the brim-like shape, and a back surface 5b of the contact member 5a has a convex spherical ridge.
The radius of curvature of the spherical surface is the same as that of the above-mentioned spherical surfaces formed on the surfaces of the rails 3e, 3e.

To explain its operation in the above configuration, in the state shown in FIG. 2, that is, when the rod 5 is at its shortest retracted position, the driver's cab cannot be 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 vibrates relative to the 0-button 5 at the portion 1 of the perforation 3d. This makes it possible to freely vibrate in the vertical direction with lost motion, and it is possible to achieve a comfortable motion by attenuating the motion.

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.
The front surface 50 that extends over the abutting material 5a will eventually form the side edge 3g.
When the rod 5 is brought into contact with the rotor 5 and extends further, the rod 5 moves the driver's cab 1 to the position shown in FIG. I lift it up like that.

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 rotates counterclockwise around the pivot point on which the driver's cab 1 is tilting. From the initial start of operation until the center of gravity is on the vertical line of the pivot center, the weight of the driver's cab 1 is supported by the rod 5 and pushed up.

On the other hand, when the center of gravity passes over the vertical line passing through the pivot center and moves to the left of the vertical line (Fig. 1), the cab 1 moves further in the counterclockwise direction due to its own weight. Trying to turn around, the mouth after entering this state.
The hand 5 must be designed to support the movement of the driver's cab 1 in a tensile manner.

Below, from just before the center of gravity of the driver's cab 1 passes through the vertical line,
The effect of this passing process will be explained.

The driver's cab 1 is centered at the pivot point 21* in Fig. 1.
When the rod 5 is tilted counterclockwise from the position Q, the rod 5 rotates clockwise relative to the support 3 about the intersection point 3h in FIG. In this case, the rotation in the clockwise direction first rotates the rod 5 together with the member 3b relative to the rotor 3a with respect to the bearing surface 30 on the plane of the paper of FIG. 3 around the intersection 3b. The rod 5 rotates counterclockwise, and as a result of this rotation, the rod 5 comes into contact with the wall surface of the borehole 3u which serves as a damper, and the rotation after this contact causes the rod 5 and the rotor to come into contact with each other. 3
a unitarily rotates counterclockwise around the rotation axis of the rotor 3a, and in this action, J
As described above, the contact member 5a is already maintained in a state in which the front surface 5C is in contact with the side surface end 3g, and in this state, the center of gravity of the driver's cab 1 passes through the pivot center as described above. From a position slightly before passing through the vertical line, the male spherical surface of the back surface 5b slides onto the rails 3e, 3e while touching the abutment material 5.
a further rotates clockwise in FIG.
It acts in the direction of pulling, so when it enters this state,
The two noses 3e and 3e of the driver's cab 11 are pushed back by the force of gravity.
As a result, the pressing force is supported by the hydraulic actuator 4 via the abutting member 5a and the rod 5, and the driver's cab 1 is tilted to a predetermined position.

In this way, is it a mock-up that lifts the cab above? In the driver's cab lifting device of the present invention, the rod 5 can be freely moved around the axial center of the rod 5, but the contact member 5a is in the radial circumferential direction of the rod 5. Since the back surface 5b is symmetrical to the rear surface 5b, even if the rod 5 rotates around the axis, the back surface 5b
The shape of b with respect to the rails 3e, 3e is always the same shape. As a result, even if the rod 5 is not provided with a complicated device such as a rotation stopper around the shaft center, the rear surface 5b can always be easily attached to the rails 3e and 3 when in the required position.
It is possible to slide up and into the e.

Further, as can be understood from the above explanation of the operation, in the driver's cab lifting device according to the present invention, the back surface 5b and the receiving surface 3e have mutually spherical shapes, so the mutual contact during the sliding is a surface contact. As a result, the contact pressure in the contact can be made very small, and the material of the contact material 5a and/or the support can be easily selected for the surface 3e. Since this reduces the frictional force of the contact, it is also possible to use an appropriate bearing material or the like to reduce the frictional force in the contact.

In addition, in the above explanation, the rails 3e, 3e and the back surface 5
The configuration in which the rotor 3 and the hydraulic actuator 4 are in contact with each other to support the weight of the cab is one in which a contact member 5a is provided between the rotor 3& and the hydraulic actuator 4, and the contact member 5a is shown in FIG.
The rails 3e and 3e may be provided at the tip end of the rod 5 above the rotor 3a, and the rails 3e and 3e may be provided at the portion indicated by the imaginary line 3q in FIG. However, it will be easily understood that in this case, the spherical surface of the back surface 5b of the contact member 5a must be a concave spherical surface, and the Q rule 3q must be a convex spherical shape.

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 becomes relative to the support 3 within the plane of FIG. The rod 5 not only rotates clockwise, but also in a direction perpendicular to the plane of the paper in FIG.
must be able to swing relative to the support 3 to some extent. It consists of hydraulic actuator 4 and support A3
This is because it is necessary to take into account the zero relative installation error and the horizontal 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.

Regarding this problem, in the present invention, the member 3b is made into a spherical shape and the bearing surface 30 is configured to pivotally support the member 3b, so that the relative movement of the rod 5 with respect to the support 3 is horizontal to the plane of the paper in FIG. At the same time, it is possible to perform the above-mentioned rotation, and at the same time, it is possible to freely swing other than horizontally, so that when lifting the driver's cab 1 or when the vehicle is running (in this case, the support During the relative movement between the tool 3 and the rod 5, no unreasonable movement occurs.

Here, in the above-mentioned embodiment, if the spherical bearing surface 31 of the member 3b is placed in a configuration in which it is directly supported by the support 3, the back surface 5b slides on the rails 3e, 3e. However, in the structure of the present invention, the support 3 is connected to the rotor. 3a is pivotally supported, and the rotor 3a is
The reason why the structure is such that the member 3b is pivotally supported is as follows.

That is, in the configurations shown in FIGS. 2 and 3, it is necessary to provide oil seals or dust seals on the spherical bearing surfaces 3o and 31 depending on the usage conditions. However, in that case, the seal between the spherical surfaces is between the bearing surface 3C and the bearing surface 3C.
Since the relative sliding with respect to 1 is spherical, it may be difficult to increase the swing.

As a result, in the embodiments in FIGS. 2 and 3,
In order to cope with the case where the above-mentioned seal is required, the above-mentioned configuration is adopted, and the back surface 5b of the contact member 5a is able to cope with the large movement with respect to the rotational movement of the rod 5 sliding into the rails 3e, 3e. The rotational movement is borne by the rotation of the rotor 3a, and the member 3b and the rotor 3a provide relief against small swings due to the above-mentioned installation error.

In the above action, the end portion 4a of the hydraulic actuator 4
is pivotally connected to chassis 2, but this is opposite to end 4a.
It will be readily understood from the above description that the support member 3 may be pivotally mounted on the side of the driver's cab 1 and the support 3 may be fixed on the side of the chassis 2.

As is clear from the above description, in the cab lifting device of the present invention, the support 3 pivotally supports the rotor 3a, the rotor 3a further pivotally supports the member 3b, and the rod 5 is attached to the member 3b. A rotor 3 is provided in the rod 5 with a perforation 3d for sliding guidance.
By fixing the contact member 5a that pushes up a, when the driver's cab is in the position where the car is ready to travel, 4 allows lost motion between the rod 5 and the support 3, and prevents the vehicle from traveling. When the hydraulic actuator 4 lifts the driver's cab 1, the relative installation error between the support 3 and the hydraulic actuator 4 or the sideways of the driver's cab 1 at the time of lifting is allowed It is possible to smoothly lift the driver's cab 1 without damaging the support 3.0 head 57 or the hydraulic actuator 4 or deteriorating their durability due to shaking. It is something that exists.

Further, the cab lifting device according to the present invention can be configured to use a sealing material used in the spherical bearing portion of the member 3b with good durability, and
Since b only needs to bear the oscillation of a small oscillation angle, there is no need to form the spherical surface of the spherical bearing with such precision, and the member 3b can be housed in a small size.

[Brief explanation of the drawing]

FIG. 1 shows a side view of a driver's cab lifting device as an embodiment of the present invention when it is installed in an automobile, and FIG. 2 shows a cross-sectional view of the support 3 in FIG. 1. 3 is a cross-sectional view of Rollo in FIG. 2. The symbols used in the examples are as follows.
: driver's cab, 2: chassis 3: support 3a: rotor, 3b = member, 30 and 31: bearing surface, 3d, 3j, 3k. 3p, 3e, 3t and 3u: perforation, 3e and 3q
:Rail, 3f: Space, 3g: Side edge, 3h: Intersection, 3m. 3n and 3r: bearing material. 4: Hydraulic actuator 4a: End. 5: Piston rod 5a: Contact material, 5b = Back, 5C: Front. Patent applicant Sanwa Seiki Co., Ltd. Representative Etsushi Nishikai0

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 in the support,
A perpendicular hole (38,3t) perpendicular to the side of the driver's cab
), and a rotor (3a) is fitted into the hole so as to be able to rotate and slide around the axial center of the hole, and the rotor has a member (3b) having a spherical outer shape as an axis. Another perforation (3d) is formed in the member, and the other perforation f allows the piston rod (5) in the hydraulic actuator (2) to slide in the axial direction of the other perforation. is fitted to the piston rod so that when the piston rod lifts up the cab, the side end of the rotor (
3g), the abutment member (5a,) that performs the lifting is fixed, and the rotor C2 rotates and oscillates with respect to the rotor, such that the piston rod rotates around the axis of the borehole. When the piston rod comes into contact with the rotor in the direction of the rotational swing,
3u). 2. The abutment member (5a) is configured to have a symmetrical shape ff + strainer and a brim-like shape in the outer circumferential direction of the piston rod (5). The driver's cab lifting device according to paragraph 1. 3. The brim-shaped abutment member (5a) has a spherical axial back surface (5b), and the spherical surface is the support member (3).
The driver's cab lifting device according to claim 2, wherein the surface of the rail (3e or 3q) fixed to the rail (3e or 3q) has the same radius of curvature as a spherical surface.