JPH02124336A - Elevating/sinking device for rear body of car - Google Patents

Abstract

PURPOSE:To elevate and sink the rear body of a car stably by installing a supporting member with buit-in elevating/sinking mechanism in the rear part of the front body, arranging a sliding member displaceable up and down relative to this supporting member in the front part of the rear body, and fitting the rear wheels with possibility of relative displacement with the rear body. CONSTITUTION:Slide brackets 16 fixed to the front right and front left sides of a rear body 5 of a car are, slidably up and down, fitted to supporting members 15 fixed to the rear left and rear right sides of the front body 1 of the car, and an elevating/sinking mechanism to move these slide brackets 16 is arranged inside of the supporting members 15. Tire houses 18 with a height enough to accommodate the rear wheels 4 are formed at both rear side of the rear body 5, and one end 20a of a suspension arm 20 bearing these rear wheel 4 at the other end 20b is pivoted in specified place of the bottom of the rear body 5. Thus the body 5 can be elevated and sunk between the running position and the road surface grounding position by operating the mentioned elevating/sinking mechanism within the supporting members 15.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application on R-beams The present invention relates to a device for lifting and lowering a cargo platform in an automobile equipped with a cargo platform.

BACKGROUND OF THE INVENTION It has been known in the past for automobiles equipped with a cargo bed behind the front body to have a structure in which the cargo bed can be moved up and down in order to improve the efficiency of loading and unloading work. Examples of elevating and lowering devices shown in FIGS. 16 and 17 are known as structural examples. That is, 1 in the figure is the front body, and i! A pair of frames 2, 2 extend in the direction, and a rear wheel 4.4 is mounted on rear wheel support brackets 3, 3 attached to the rear ends of the frames 2, 2. 5 is a loading platform, and this loading platform 5 is connected to the frame 2,
It is located between the two and is arranged so that it can be raised and lowered freely.

The elevating mechanism of the loading platform 5 is as follows. That is, the frames 2, 2 and the links 7.7 each having a substantially isosceles triangle arranged at the front and rear parts of the pair of frames 2, 2 are pivotally supported by the pivot support 8°8. Furthermore, a predetermined portion of the loading platform 5 is pivotally supported by the n'1 portions 9, 9 of the link 7.7, while one end portion 10.
Between 10 and 10, a pair of parallel rods 11. II is pivotally mounted.

Further, a hydraulic cylinder 13 is installed between the rear end 2a of the freight 2 and the front end 7a of the link 7.
iii.

According to this configuration, the expansion and contraction movement of the hydraulic cylinder 13 is
, (Then, the link 7.7 rotates around the pivot supports 8, 8, and the pair of links 7.7 are interlocked based on the action of the rod 11.+1, so that the fHi stand 5 is shown by the solid line. It is possible to move up and down between the highest position and the lowest position indicated by the imaginary line, and especially when the loading platform 5 is set to the lowest position, the loading platform 5 can be lowered to the level of the road surface. This makes it easier to load and unload cargo, and when the car is running, the loading platform 5 can be raised to an appropriate height, making it possible to drive safely.
This provides the effect of allowing the load to be lifted to any desired height.

Problem to be Solved by the Invention However, in such a conventional automobile cargo platform lifting device, the rear wheels 4, 4 are connected to a pair of left and right frames 2, 2.
Since it is attached to the rear wheel support brackets 3, 3 attached to the rear end, the stability of the loading platform 5 is not necessarily guaranteed when a lateral force is applied to the rear wheels 4, 4 from the outside. It cannot be said that it is sufficient, and there is a problem that running performance may be impaired. That is, the frame 2 with the rear wheel 4.4 extending rearward.
2, the rear wheel 44 is held by a cantilever beam, which does not provide sufficient rigidity.
, 4 changes, which tends to result in a loss of running stability.

Furthermore, since the loading platform 5 is disposed between the frames 2 and 2 so as to be able to rise and fall freely, the dimension of the loading platform 5 in the vehicle width direction is limited to a smaller dimension than the dimension between the rear wheels 4. This poses a problem in that the area on which cargo can be loaded cannot be sufficiently expanded.

Therefore, the present invention solves the problems that the conventional vehicle loading platform unloading device has, and the (47
The stability of the stand is increased, and the baggage can be handled by F72.
In addition to increasing the rigidity of the rear wheel support structure, it is possible to prevent the toe angle of the rear wheels from changing due to lateral forces received during driving, thereby increasing driving stability. The purpose of this invention is to provide a 1iii platform elevating device.

Means for Solving the Problems In order to achieve the above object, the present invention provides a first embodiment in which a front wheel, a running device and a riding device for the front wheel are jiffed.
In an automobile in which a loading platform with rear wheels mounted is connected to the rear of a front body that has been extended, a supporting member fixed to the rear of the front body, and a supporting member fixed to the front of the loading platform in the vertical direction with respect to the supporting member. a sliding member that is freely displaceable; a lifting mechanism that is built into the support member and moves the sliding member in the vertical direction; According to a second embodiment of the present invention, in the automobile with the cargo platform, the lower rear end portion of the front body and a pivot support that rotatably connects the front lower end of the loading platform, and a shaft support that is disposed between the upper end of the front body and one end of the loading platform, and is arranged between the front body and the loading platform in the rotational direction. An automobile loading platform elevating device comprises: a drive mechanism disposed between the loading platform and the rear wheel support member, and capable of freely displacing the loading platform in the rotational direction and the vertical direction. .

Furthermore, as a third embodiment of the present invention, in the above-mentioned automobile with a cargo bed, the above-mentioned vehicle is fixed to the rear of the front body,
a support member formed with a slope portion having a predetermined angle; a slope portion formed in front of the loading platform and slidable along the slope portion of the support member; and a slope portion built into the support member to support the loading platform. A sliding mechanism that slides along the slope of the member, and a rear wheel support structure that is disposed between the loading platform and the support shaft of the rear wheel and that can freely displace the loading platform in the vertical direction. This is the structure of an automobile loading platform lifting device.

Effects of the present invention are as follows. According to the third embodiment, by operating the lifting mechanism built into the support member fixed to the front body, the cargo platform can be freely raised and lowered from the d-most position to the travel position and further to the lowest position. At this time, the rear part of the loading platform is supported by a rear wheel support structure that is disposed between the loading platform and the support shaft of the rear wheel and can freely displace the loading platform in the vertical direction. The cargo platform can be held horizontally for 17 days. In particular, by setting the loading platform to the lowest position, the loading platform is at the same height as the road surface, making it easier to load and unload cargo.

Also, 1st. Second. According to the third embodiment, while the vehicle is running, the input to the rear wheels is transmitted through the members constituting the rear wheel support structure.
Since it is supported by all the structural members of the IIR platform, the rigidity of the rear wheel support structure is increased, and the toe angle of the rear wheel is prevented from changing due to lateral forces received during driving, improving driving stability. The effect of doing so is brought about.

Further, according to the second embodiment of the present invention, the loading platform is set from the highest position to the normal traveling position and further to the lowest position based on the operation of the drive mechanism that moves the loading platform up and down with respect to the rear wheels. In addition, since the displacement of the front body and the displacement of the loading platform are operated by separate drive mechanisms, usage modes such as tilting only the loading platform are also possible.

Furthermore, according to the third embodiment of the present invention, by operating the lifting mechanism built in the support member, the loading platform is moved from the highest position to the normal traveling position along the slope formed in the support member, and further In addition to being able to slide to the lowest position, there is no problem even if there are various protrusions on the lower rear side of the front body, and the space can be used effectively. As a result, the wheelbase between the front wheels and the rear wheels can be reduced, thereby improving the turning performance of the vehicle.

Examples Below, examples of the automobile loading platform lifting device according to the present invention are as follows.
The same components as those of the conventional structure will be described in detail with the same reference numerals.

FIG. 1 is a schematic plan view showing a first embodiment of the present invention, and FIG.
The figure is a side view of the same, and in the figure, 1 is a front body, 5 is a loading platform, and support members 15.15 are fixed to the rear left and right sides of this front body l. On the other hand, sliding brackets 16, 16 fixed to the front left and right sides of the 1:4 platform 5 are fitted so as to be slidable in the vertical direction. Inside the support members 15.15 fixed to the rear left and right sides of the front body 1, sliding brackets 16.16 fixed to the front left and right sides of the loading platform 5 are moved, as will be described later. It has a built-in lifting mechanism.

Tire houses 18 and 18 in which the rear wheels 4, 4 are housed are formed on both rear sides of the loading platform 5.

The tire houses 18, 18 are formed with sufficient dimensions in the vertical direction so that the rear wheels 4, 4 do not become an obstacle when the loading platform 5 is raised or lowered.

2-0.20 is a suspension arm as a rear wheel support structure, and one end portion 20a, 20a of this suspension arm 20.20 is pivotally supported at a predetermined part of the bottom surface of the cargo platform 5, while the suspension arm 20.20 is The other end portions 20b, 20b of the con arm 20.20 are rotatably attached to the support shafts 19.19 of the rear wheels 4, 4.

According to the first embodiment of the present invention, the loading platform 5 is moved from the highest position shown in FIG. to the traveling position shown in Figure 3, and then to the fourth position.
It is possible to freely move up and down to the lowest position shown in the figure, and in particular, by setting the loading platform 5 to the lowest position, the loading platform 5 becomes the same height as the road surface, making it easier to load and unload cargo. Effect can be obtained. Also, it becomes possible to lift the cargo to any desired height.

When the loading platform 5 is moved up and down, the suspension/con arm 2020 freely rotates around the support shaft 19.19 to support both rear sides of the loading platform 5. It functions as a type of strength member.

That is, while the car is running, the human power applied to the rear wheels 4.4 is received by the entire structural members of the loading platform 5 through the suspension/yellow 20° 20 that constitutes the rear wheel support structure, so the rigidity of the rear wheel support structure is increased. At the same time, the toe angle of the rear wheels 4.degree. 4 is prevented from changing due to lateral forces received during driving, thereby improving driving stability.

Support member 15.1 fixed to the front body l side
5 and the sliding bracket t-1 (3,1
An example of the fitted state of No. 6 will be described with reference to FIGS. 5 and 6. In other words, a plurality of support brackets 23a, 23b, 23 are provided in the vertical direction on both rear left and right sides of the body l.
screw shafts 25 and 25 are rotatably inserted into holes 24a, 24b, and 24c that are opened approximately at the center of the support brackets 23a, 23b, and 23c. On the other hand, a plurality of sliding brackets 15a, 16 are provided in the vertical direction on both sides of the front left and right sides of the loading platform 5.
b are fixed in pairs on the left and right, and this sliding bracket 16
The screw shafts 25 and 25 are screwed into screw holes 26a and 26b formed in holes a and 16b. Therefore, the screw shaft 25
．． Along with the rotation of 25? tZ several sliding brackets 16
a and 16b can move in the vertical direction.

On the other hand, 28 is a motor fixed to the front body l side, and a chain 30 is passed between the output shaft of the motor 28 and a gear 31 fixed to the lower end of the screw shaft 25 on one side. A chain 33 is stretched between the gear 31 and a gear 32 fixed to the lower end of the screw shaft 25 on the other side. Therefore, the rotational force of the motor 28 is transmitted to the screw shaft 25.25 via the gear 31.32 and the chain 30.33, and the screw shaft 25.25 is set to rotate in the same direction.

As shown in FIG. 6, which is a sectional view taken along the line Vl-Vl in FIG. 5, the screw shaft 25 is divided into an upper screw shaft 25a and a lower screw shaft 25b, each of which has a bearing
4, 45.46 support brackets 23a, 23b
, 23c is rotatable (while supported by 13,
A connecting shaft 35 integrally fixed above the lower screw 'l1llll 25b is connected to the upper screw shaft 25a by a spline 36.
The gear 3 is connected to the lower screw shaft 25b by a spline 39 or a connecting shaft 37 integrally fixed below the lower screw shaft 25b.
1 (32) support lpH138. Furthermore, the support bracket 23b has a boss 23 that projects downward.
A lock ring 4 is formed on this boss 23e.
0 or screwed together. 40a is a lock lever fixed to the lock ring 40. Therefore, this lock lever
408 to rotate the lock ring 40, the lock ring 40 moves downward and the lower threaded shaft 25b
It is configured to press downward.

According to such a configuration, when the motor 28 is first started when moving up and down the loading platform 5, the rotational force of the motor 28 is applied to the chain 30. Gear 31. This is transmitted to the threaded shaft 25.25 through the chain 33 and the gear 32, and the threaded shaft 25.25 starts rotating in the same direction. Then this screw shaft 25,
The sliding brackets 16a and 16b screwed into the brackets 25 start moving up and down, and the loading platform 5 moves up and down.
When the rotation of the motor 28 is stopped, the movement of the loading platform 5 is also stopped. When the movement of the loading platform 5 is stopped, the lock ring 40 is rotated by operating the lock lever 40a, and the lock ring 40 is lowered from the solid line position shown in FIG. 6 to the imaginary line position in the figure. By pressing the lower screw shaft 25b downward, stress in the axial direction is generated on the lower screw shaft 25b, and rattling of the screwed portion is prevented, and the loading platform 5
The rigidity of the connection to the front body l is increased.

Therefore, the screw shaft 25 does not rotate due to vibrations during traveling, and the height of the loading platform 5 can be maintained constant.

FIG. 7 shows an example of how the suspension arms 20 and 20 are mounted on the rear wheels 4, 4 side.

That is, as described above, the other ends 20b of the suspension arms 20, 20 are attached to the support shafts 19, 19 of the rear wheels 4, 4.

20b is pivoted, and one end 20a of the suspension/con arm 20 on one side is attached to a torsion spring 54.
The other end of the torsion spring 54 is supported by the lower end of the link member 50. Also, one end 2 of the suspension/con arm 20 on the other side
0a is fixed to a torsion spring 55, and the other end of this torsion spring 55 is supported by the lower end of the link member 51. The above link member 5
Each upper end portion of 0.51 mm is a pair of elongated link members 52.
52, and the front end 5 of this link member 52°52
A pair of link members 53 in which 2a and 52a have an abbreviated shape
．． It is pivotally supported at the lower end of 53. This link member 53
．． 53 is pivotally supported on the loading platform 5 by a shaft support 5757, and has a long hole 53a at one end of the link member 53.53.
, 53a are formed with openings, and these long holes 53a, 53
A pin 56 56 protruding from the front body l side is fitted into the pin 71 . Therefore, as the relative position between the front body 1 and the loading platform 5 changes, the link members 53,
52, 51, and 50 operate as shown in FIGS.
The direction of rotation at both the left and right ends of the loading platform 5 changes, and the vertical movement of the loading platform 5 is performed smoothly. At this time, the torsional action of the torsion springs 54, 55 during driving serves as a buffering action on the vehicle against human force from the road surface.

FIG. 9 shows a second embodiment of the present invention. In the case of this embodiment, the rear lower end 1b of the front body 1 and the front lower end 5b of the loading platform 5 are rotated by a shaft support 58, as shown in the figure. In addition, a hydraulic linter 59 as a drive mechanism is installed between the rear end 1a of the front body l and the upper end 5a of the loading platform 5, and a predetermined portion 5c of the loading platform 5 and the link A hydraulic/cylinder 60 as a drive mechanism is also installed between the member 50 (51).

The heavy pressure/linter 59 has the function of displacing the front body l and the loading platform 5 in the rotational direction, and the hydraulic cylinder 60 on the other side rotates the torsion springs 54 and 55 to move the loading platform toward the rear wheels 4, 4. Uke has the effect of raising and lowering the position of 5.

According to the second embodiment of the present invention, by extending the hydraulic cylinder 60 from the state shown in FIG. 9, the loading platform 5 reaches the uppermost position 21 as shown in FIG. By appropriately shortening the hydraulic pressure/cylinder 60, 111 units 5 as shown in FIG.
or the normal driving position. Further, when the hydraulic cylinder 59 and the hydraulic cylinder 60 are shortened to the maximum, the loading platform 5 can be set to the lowest position as shown in FIG.

Furthermore, in the case of this second embodiment, since the displacement of the front body l and the displacement of the loading platform 5 are operated by separate hydraulic linter 59, 60, it is also possible to use the vehicle in a manner such that, for example, only the loading platform 5 is tilted. Kinari, also, front body l
Even if there is piping or wiring that spans between the cargo platform 5 and the loading platform 5, the installation of these is easier than in the six examples and the conventional example.

In addition, even in the case of the second embodiment, the rigidity of the support structure for the rear wheels 4, 4 can be increased while the vehicle is running, so that the direction of the FM force received while the vehicle is running can be increased. The toe angle of the rear wheels 4.4 is prevented from changing due to force, resulting in improved running stability.

FIG. 13 shows a third embodiment of the present invention. In this embodiment, a support member 61 fixed to the rear of the front body l has a slope portion 61a having a predetermined angle, and
A sliding slope portion 5d is formed in front of the loading platform 5 on the slope portion 61a, and the loading platform 5 is attached to the supporting member 61 on the slope portion 61.
It has a built-in elevating mechanism that slides along a.

The structure of the rear part of the loading platform 5 is the same as in the first embodiment, in which one end portions 20a, 20a of a suspension arm 20, 20 serving as a rear wheel support mechanism are pivotally supported at a predetermined location on the bottom of the loading platform 5, while the suspension The other end of the arm 20.20 is rotatably attached to the support shaft of the rear wheels 4, 4.

According to this third embodiment, by operating the lifting mechanism built in the support member 61, the loading platform 5 is moved from the highest position shown in FIG. It becomes possible to slide to the normal running position shown in FIG. 14 and further to the lowest position shown in FIG. 15. In the case of the third embodiment, there is no problem even if there is a protrusion such as a transmission on the lower rear side of the front body l, and there is an advantage that space can be used effectively. Furthermore, since the wheel base between the front wheels and the rear wheels can be changed, it has the advantage that the turning performance of the automobile can be improved as needed.

Even in the case of the third embodiment, while the car is running, the input to the rear wheels 4.4 is received by the entire structural members of the loading platform 5 via the suspension arms 20, 20 that constitute the rear wheel support structure. Therefore, the rigidity of the rear wheel support structure is increased, and the rear wheels 4,
4 is prevented from changing, resulting in an effect of improving running stability.

Effects of the Invention As explained in detail above, according to the vehicle cargo platform elevating device according to the present invention, as a first embodiment, a rear portion is provided at the rear of the front body, which is equipped with a front wheel, a running device for the front wheel, and a riding device. In a car that is constructed by connecting a loading platform with wheels,
a support member fixed to the rear part of the front body; a sliding member fixed to the front part of the loading platform and movable vertically with respect to the support member; and a sliding member built into the support member. A structure of an automobile loading platform elevating device comprising a lifting mechanism that moves the loading platform in the vertical direction, and a rear wheel support structure that is disposed between the loading platform and the support shaft of the rear wheel and that allows the loading platform to be freely displaced in the vertical direction. Further, as a second embodiment of the present invention, in the above-mentioned automobile with a cargo bed, a shaft support rotatably connects the rear lower end of the front body and the front lower end of the cargo bed; a drive mechanism disposed between one upper end and one upper end of the loading platform to displace the front body and the loading platform in the rotational direction; and a drive mechanism disposed between the loading platform and the rear wheel support member to move the loading platform. This is a structure of an automobile loading platform elevating device comprising a drive mechanism that is freely displaceable in the rotational direction and the vertical direction.

Furthermore, as a third embodiment of the present invention, in the above-mentioned automobile with a cargo bed, the above-mentioned vehicle is fixed to the rear of the front body,
a support member formed with a slope portion having a predetermined angle; a slope portion formed in front of the loading platform and slidable along the slope portion of the support member; and a slope portion built into the support member to support the loading platform. An automobile comprising: a slider groove for sliding along the slope of a member; and a rear wheel support structure disposed between the loading platform and a rear wheel support shaft to allow the loading platform to be vertically displaced. Since the loading platform elevating device is configured as follows, the following effects are brought about. In other words, in each of the above embodiments, by operating the lifting mechanism built into the support member fixed to the front body, the loading platform can be freely raised and lowered from the highest raised position to the travel position and further to the lowest lowered position. It is possible to
At this time, the rear part of the loading platform is disposed between the loading platform and the rear wheel support shaft, and is supported by a rear wheel support structure that can freely displace the loading platform in the vertical direction, so that the loading platform can be held in a horizontal state. Can be done. In particular, by setting the loading platform to its lowest position, the loading platform is at the same height as the road surface, making it easier to load and unload cargo, and also being able to lift the cargo to any desired height. Furthermore, the dimensions of the cargo platform in the vehicle width direction can be increased, making it possible to increase the overall area on which cargo can be loaded.

Furthermore, in the case of each of the above embodiments, while the car is running, the input to the rear wheels passes through the rear wheel support member and is stopped by the entire structural member of the loading platform, so the rigidity of the rear wheel support structure is increased. Even when a lateral force is applied during driving, the toe angle of the rear wheel is prevented from changing, resulting in the effect of improving driving stability.

Further, according to the second embodiment of the present invention, the loading platform is set from the highest position to the normal traveling position and further to the lowest position based on the operation of the drive mechanism that moves the loading platform up and down with respect to the rear wheels. In addition, since the front body displacement and the loading platform are operated by separate drive mechanisms, there is an advantage that usage modes such as tilting only the loading platform are also possible.

Furthermore, according to the third embodiment of the present invention, even if there are various protruding parts on the lower rear side of the front body, there is no problem, and the space can be used efficiently, and the front wheels can be adjusted as needed. This has the effect that the wheel space between the rear wheels can be reduced to improve the turning performance of the automobile.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a first embodiment of the loading platform lifting device according to the present invention, FIGS. 2, 3, and 4 are side views showing the same operating state, and FIG. FIG. 6 is a sectional view taken along the line Vl-Vl in FIG. 5; FIG. 7 is a partial perspective view showing other essential parts of the first embodiment; FIG. 8(A), 8(B), and 8(C) are schematic side views showing the same operating state, FIG. 9 is a side view showing the main parts of the second embodiment of the present invention, FIG. 1O, FIG. 11, FIG. 12 is a schematic side view showing the operating state of the second embodiment, FIG. 13 is a side view showing main parts of the third embodiment of the present invention, and FIG. 14 and FIG. Schematic side view showing the state of operation of the example, first
FIG. 6 is a plan view showing an example of a conventional vehicle platform lifting device, and FIG. 17 is a side view of the same. l...front body, 4.rear wheel, 5...cargo platform, +
5 = Support member, 16. 16a, 16b... Sliding bracket, I8 tire house, 19... Support shaft, 20...
Suspension arms 23a, 23b, 23cm (as i & wheel support structure)...Support bracket 25a...
- Upper screw shaft, 25b... Lower screw shaft, 28 - Motor, 30.33... Chain, 31.32 - Gear, 40
... Lock ring, 50.51, 52.53 ... Link member, 54.55 ... Tone spring, 5
8... Axial support, 59.60 - Hydraulic cylinder (as a drive mechanism), 61a... Slope part, Fig. 3 Fig. 8 Fig. 9 Fig. 1, Fig. 11 Fig. 12 Fig. 13 Fig. 15 Fig. 16 Figure 17

Claims (3)

[Claims] (1) In an automobile comprising a front body equipped with front wheels, a running device and a riding device for the front wheels, and a loading platform with the rear wheels connected to the rear of the front body, a support member fixed to the rear of the front body; a sliding member fixed to the front part of the loading platform and freely displaceable in the vertical direction with respect to the support member; an elevating mechanism built in the supporting member to move the sliding member in the vertical direction; 1. A vehicle loading platform lifting device comprising: a rear wheel support structure disposed between a wheel support shaft and capable of vertically displacing the loading platform. (2) In a vehicle in which a loading platform with rear wheels is connected to the rear of a front body equipped with front wheels, a running device and a riding device for the front wheels, the lower rear end of the front body and the lower front end of the loading platform. A shaft support that rotatably connects the
A drive mechanism that displaces the front body and the loading platform in the rotational direction, and a driving mechanism that is disposed between the loading platform and the rear wheel support member and can freely displace the loading platform in the rotational direction and the vertical direction. An automobile loading platform lifting device featuring: (3) In a vehicle in which a loading platform with rear wheels is connected to the rear of a front body equipped with front wheels, a running device and a riding device for the front wheels, a loading platform with a rear wheel is fixed to the rear of the front body and is angled at a predetermined angle. a support member having a slope portion formed thereon; a slope portion formed in front of the loading platform and slidable along the slope portion of the support member;
a sliding mechanism built into the support member to slide the loading platform along the slope of the supporting member; and a sliding mechanism disposed between the loading platform and the support shaft of the rear wheel to displace the loading platform in the vertical direction. An automobile cargo platform lifting device characterized by comprising a flexible rear wheel support structure.