JPS632777A - Cab tilt device - Google Patents

Abstract

PURPOSE:To absorb the rolling of a cab at a time of tilting by connecting the other end of the elevator rod of a cab tilt device whose one end is connected to a chassis, to a lost motion link through a universal joint which is freely turnable in the front and rear directions of a vehicle and also axially in the traverse direction. CONSTITUTION:One end of a cab tilt device which has a built-in motor and makes a rod 10 rise and fall through rotating a rotational shaft 9 is connected to a chassis, and the elevator rod 10 at the other end is connected to the end portion 12a of a lost motion link 12 pivoted to a bracket 16 underneath a cab. The connection is made by means of a ring 22 fitted to the rod 10 and a joint 28 pivoted to the lost motion link 12, which constitutes a universal joint freely turnable mutually along a shaft 30 in the front and rear directions of a vehicle and axially in the traverse direction. The rolling of the cab at a time of cab- tilting may be absorbed by means of the universal joint portion made up of the ring 22 and the joint 28, and at the same time the overall length of the cab tilt device may be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cab tilt device used in a large cab-over type vehicle.

[Conventional technology]

In large cab-over type trucks, the engine room is located below the driver's cab, which is called the cab.
In order to perform maintenance and inspection of the engine and the like inside the cab, a cab tilting device is provided to lift the cab and tilt it forward.

- In general, a cab tilt device has a lower end attached to the chassis, which tilts the cab forward by expanding and contracting this nactuator, and when the vehicle is running, vibrations and shocks of the cab are caused by the rocking of the lost motion link. The system is designed to improve the ride comfort for passengers by absorbing the In such a cab tilt device, in order to absorb the sideways movement of the cab when the cab is tilted forward due to the actuator rising, the actuator (102)
and the lost motion link (104) by extending the upper part (106a) of the connecting member (106) upward,
This part (106a) and the lost motion link (10
4) A spherical bearing (11) is placed between the fully supported shaft (108)
0) is installed.

[Problem that the invention seeks to solve]

In the conventional cab tilt device as described above, a spherical bearing (1
10), the connecting member (io6) fitted to the upper end of the actuator (102) is extended upward, which increases the installation length of the actuator (102), which is not desirable for use in a cab tilt device. There was a drawback that there was no

The present invention has been made to eliminate such drawbacks.
To provide a cab tilt device capable of absorbing lateral shaking of a cab without increasing the overall length of an actuator.

[Means for solving problems]

A cab tilt device according to the present invention includes a cab rotatably connected to a chassis via a tilt shaft, one end pivoted to the chassis, and the other end pivoted to the cab via a lost motion link. A shaft that can be rotated integrally with any one of the elevator mechanisms is disposed facing the longitudinal direction of the vehicle, and a bearing that supports the shaft is integrally provided on the other side of the cab and the elevator mechanism. It is rotatably provided.

[Effect]

In the cab tilt device according to the present invention, when the cab causes lateral sway during tilting, the shaft disposed toward the front-rear direction of the vehicle rotates in the left-right direction of the vehicle within the bearing that supports the shaft. This absorbs the relative rotation in the left-right direction between the cab and the lifting mechanism, which are connected to each other so as to be able to physically rotate.

〔Example〕

The present invention will be explained below with reference to illustrated embodiments. Fig. 1 is a side view showing a cab tilt device according to an embodiment of the present invention, Fig. 2 is an enlarged view of the main parts, Fig. 3 is a front view with the main parts in section, and Fig. 4 is an enlarged view of the main parts. The cab (4) placed on the chassis (2) is supported by springs (not shown) at the front and back, and the tilt axis (not shown) provided at the lower front is supported by the expansion and contraction of the actuator (6). It rotates and hangs around the center. Actuator (6
) is rotatably connected to the chassis (2) at its base (6a), and rotates as the rotating shaft (9) (see Figures 6 and 4) is driven by the motor (8). Then, the rod α@ moves up and down. The end (12a) of the lost motion link (2) is rotatably connected to the tip of the lifting rod α@, and the other end (12b) of the lost motion link (2) is connected to the shaft (14). It is pivotally connected to a bracket α6) attached to the lower surface of the cab (4). Axis 0
As shown in an enlarged view in Fig. 4, both lost motion links (14a) pass through a hole formed in a bracket α6) having a U-shaped cross section and are fitted to the outer peripheral surface of the pipe (14a).
) is fastened and fixed while being sandwiched between the pipes (1
4a) It is rotatable relative to the bracket α6) via a pair of bearings (14b) provided on the outer periphery.

When the cab tilt device shown in Fig. 1 is not in operation (that is, when the vehicle is in a running state), the upper end surface (12c) of the lost motion link (2) on the head side of the lifting rod is attached to the lower surface of the cab (4). The lost motion link (shown by the imaginary line in Figure 2) is able to absorb the vibration caused by the running of the vehicle by the lost motion link.

In addition, when tilting the cab (4) forward, when the actuator (6) is operated to raise the lifting rod α0), the toe surface (12c) on the rod α0) side of the cost motion link (to) 4) (see Figure 5), then as the rod (10) rises, the cab (
4) is pushed up and gradually leans forward. When the cab (4) is tilted forward in this way, it will sway in the range shown by the imaginary line in FIG.

A mechanism for absorbing relative movement between the cab (4) and the actuator (6) due to lateral shaking will be explained in detail with reference to FIGS. 4 to 9. Figure 4 is an enlarged view of the main parts of Figure 3.
Fig. 5 is a side view showing the actuator in operation, Fig. 6 is a sectional view taken along the line ■-■ in Fig. 2, and Fig. 7 is a side view showing the actuator in operation.
The sectional views taken along the line -■, FIGS. 8 and 9, show a joint and a ring that constitute a connecting portion between the actuator and the lost motion link.

A cylindrical lifting rod fitted to the rotating shaft (9) of the actuator (6) is held between the inner surface of the rod rod and the outer surface of the rotating shaft (9), and is screwed onto the upper end of the rotating shaft (9). It is configured to move up and down relative to the rotating shaft (9) via a bearing that is prevented from being removed by a screw (9). A ring (22) having the shape shown in FIG. 9 is fitted onto the outer periphery of the upper end of this lifting rod C1o and is fastened and fixed with a lock. The ring (22) has two thick parts (2
2a) is formed, and holes (22b) are provided in each of these thick parts (22a), and the two holes (22b) are fixed on the lifting rod α0) with the two holes (22b) facing the longitudinal direction of the vehicle. has been done.

A joint (goods) is arranged around the outer circumference of the ring.

As shown in Fig. 8, the joint (to) has four protrusions (28a) and (28b) provided at equal intervals around the periphery, and each of these protrusions (28a) and (28b) has a is provided with screw holes (28c) and (28a) passing through the inside and outside. The protrusions (28a) and (
28b) is a pair of 9 and 9, and the - side protrusion (
28a) has the shape of a cylinder with both sides cut off, and the other protrusion (28b) has a substantially rectangular parallelepiped shape.

The protruding part (28b) of the rectangular parallelepiped is arranged to match the thick wall part (22a) of the ring (goods), and the screw hole (28a) of the joint example and the hole (22) of the ring (22)
A shaft (E)) is inserted into 2B). The shaft (2) has a male thread formed in the portion (30a) located in the screw hole (28d), and is screwed and fixed to the joint example, and the tip (3
0b) has a cylindrical shape, and the hole (2213
) is rotatably fitted into the nine holes provided in the hole.

On the other hand, the protrusion (2
The screw shafts are screwed together in the screw hole (28c) of 8a). A spherical bearing is fitted in the outer part of the protrusion (28a) between these screw shafts and fixed with a nut (381).Both screw shaft openings extend in the left-right direction of the vehicle, and By supporting the above spherical bearing example between the bearings press-fitted into the hole in the end (12a) on the side of the lifting rod (10) of the lost motion link (■), the lifting rod (10) and the lost motion link (successful) are supported. are connected.

As above), the lifting rod Cl0) and the lost motion link (2) are the ring (goods), the joint (28), and the shaft)
), screw shafts, etc., and the connecting portion of both CLC and (2) is covered by an upper cover decoy and a lower boot f44) to prevent foreign matter from entering.

Note that the protrusion (28a) having the arcuate surface (28e) of the joint fits into the circular notch (16a) (see Figure 5) of the bracket α6) when the cab (4) is tilted. This is to prevent the cab (4) from overtilting and suddenly falling over by rotating and engaging within the notch (16a) after the cab (4) has been tilted. There is.

As described above, the cab tilt device having the above configuration uses the swing of the lost motion link to cause the cab (4
), and when tilting, the cab (4) is pushed up and tilted forward via the lifting rod (10) by actuation of the actuator (6). Also, cab (4)
When the cab (4) is tilted, if the cab (4) shakes sideways, the joint pivoted to the bracket (16) of the cab (4) and connected to the running lost motion link (2) via a spherical bearing. (28) and the actuator (6), the tip (3ob) of the shaft (screwed and fixed to the joint (roll)) is connected to the bush of the ring (8)). Absorbs water by rotating inside.

Next, a second embodiment will be described with reference to FIGS. 10 to 13. A connecting member bag is fixed to the upper end of the elevating rod of the actuator (6) by a lock ring (5o; (see Figure 12). The connecting member has a cup-shaped body (see Figure 13). Engaging parts (52b) in the shape of cutting off both side surfaces of a cylinder are formed on both sides of the cylindrical part (52a), and a threaded part (52b) is formed roughly in the center of both engaging parts (52b).
c) is provided. These threaded portions (52c) are fitted into a sliding ring that is press-fitted into a hole formed in one end (12a) of the lost motion link, and are secured against the lost motion link by means of M. Connected for relative rotation. The other end (12b) of the double-ended strike motion link is attached to both side walls of the rear end (56a) of the bracket edge (see Figure 11) arranged in the longitudinal direction of the vehicle. axis □□□) (see Figure 12)
It is pivotally supported through.

On the other hand, on the bottom of the cab (4), there is a
A bracket (62a) with two parts (6 paddles, (4)) is fixed.
A) and bolts extending rearward and forward, respectively, are fixed to a).

The front wall (56b) of the bracket (56b) connected to the lost motion link (12) and the wall (56c) provided on the rear side have a bush (ffo) and a boss (3) fitted into the inner surface. , I'76+ are fixed. Bracket (6 (2) fixed to the bottom of the cab (4)
), both parts of the port are screwed together (56),
The tips (66a) and (68a) of H have a cylindrical shape, and are fitted into the bushes σo) and X so as to be rotatable. Therefore, the bracket fixed to the cab (4) (601) and the lost motion link (
The old connected bracket)R is a bracket that can rotate relative to the left and right of the vehicle around the axis (○) of both bolts extending in the front and rear directions of the vehicle. It has become.

Arc-shaped notches (56d) are formed on both sides of the lost motion link (on the bracket on the side of 12), and similar to the above embodiment, the arc-shaped surface (52
The notch (52b) of this bracket is designed to prevent the cab (4) from overturning when overtilting by engaging the retaining part (52b) having a
Slightly above 6a) is a U-shaped bracket (support).
is fixed, and the above lost motion re/re(support)
When the lifting rod swung around its axis (end) due to the rise of the lifting rod, the lost motion link (the upper end surface (12c) on the head side of the lifting rod hit this U-shaped bracket field) and caused the cab (4) to It's meant to be pushed up. Therefore, the installation angle of the U-shaped bracket (hu) is different, the installation angle of the lost motion link (12) is different, and the upper end surface (12
O determined by the inclination of c) In the cab tilt device with the above configuration, while the vehicle is running, the lost motion link (between the axles) absorbs the vibrations of the cab (4) due to the previous swinging. , when the cab is tilted, as shown in Figure 10, the lifting rod α0)
is raised and the U-shaped bracket 13) is pushed up via the rod-side upper end surface (12c) of the lost motion link (to), thereby tilting the cab (4) forward (left side in Fig. 10). If the cab (4) rolls horizontally when the cab (4) is tilted, the lost motion link (2) connected to the bracket (61 and lifting rod σ0) fixed to the cab (4) will pivot. The mounted bracket (3) absorbs the lateral movement n of the cab (4) by rotating relative to the axis (0) of the above-mentioned poles.

〔Effect of the invention〕

As described above, according to the present invention, since the cab and the elevating mechanism rotate relative to each other around the axis disposed in the longitudinal direction of the vehicle, the cab can be moved without increasing the overall length of the elevating mechanism. It is possible to absorb the lateral vibration n during tilting.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a cab tilt device according to an embodiment of the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1, Fig. 3 is a front view with the main part in section, and Fig. 4 is Fig. 3 is an enlarged view of the main parts of Fig. 3, Fig. 5 is a side view showing the main parts during operation, Fig. 6 is a sectional view taken along the ■-v+ line of Fig. 2, and Fig. 7 is the -■ of Fig. 6. - Figure 8 is a perspective view of the joint, Figure 9 is a perspective view of the ring, Figure 10 is a side view showing the second embodiment, and Figure 8 is a perspective view of the joint.
FIG. 1 is a longitudinal sectional view of the main part, FIG. 12 is a partially sectional front view of the main part, FIG. 13 is a perspective view of a connecting member, and FIG. 14 is a longitudinal sectional view of a conventional cab tilt device. (2) Rainbow (4): Cab (6): Lifting mechanism (12): Lost motion link (support)), t661, ml: Between axles in the longitudinal direction of the vehicle, (701, Decoy: Bearing patent applicant Automotive equipment Agent Co., Ltd. Patent attorney Shudo Yamazaki
Aikawa 9 Eikichi Inuzuka Atsushi Miyaji Figure 1 Figure 2 Figure 3 Mountain Figure 4 Figure 7 Figure 8 Figure 9 Figure 2a Figure 13 Figure 14 Procedural amendment (voluntary) 1986 7 month no θ day

Claims (1)

[Claims] A cab tilt device comprising a cab rotatably connected to the chassis via a tilt shaft, and a lifting mechanism having one end pivoted to the chassis and the other end pivoted to the cab via a lost motion link, By connecting a shaft extending in the longitudinal direction of the vehicle to be integrally rotatable with either the cab or the elevating mechanism, and by providing a bearing that supports the shaft so as to be rotatable integrally with the other side, the cab and the elevating mechanism are connected. A cab tilt device that is characterized by absorbing the shaking of the vehicle in the left and right directions.