KR102476928B1 - Carrier vehicle - Google Patents

Abstract

(Problem) To provide a conveyance cart capable of reducing the weight of the entire device cart through a simple device configuration.
(Solution) A wheel pair 11, 12, a wheel frame 20, 21, an elevating mast 30, 31, and a support link group 40, 50 are provided, and the wheel pair 11, 12 comprises a first The first wheel 13 and the second wheel 14 are composed of, at least one of the first wheel 13 and the second wheel 14 is composed of a driving wheel, and the first support link group 40 is composed of a first One end of the mast support link 41 is connected to the attachment portion 24 of the first wheel 13 of the first wheel frame 20, and the other end thereof moves upward and downward from the first wheel frame 20. One end of the second mast support link 51 connected to the mast 30 and constituting the second support link group 50 is the attachment portion 24 of the second wheel 14 of the first wheel frame 20 , and the other end is connected to the second elevating mast 31 from above the first wheel frame 20 .

Description

Transport vehicle {CARRIER VEHICLE}

The present invention relates to a transport vehicle having a platform for transporting products.

[0003] In recent years, in transport vehicles for transporting products, higher travel speeds are required to improve transport efficiency. Further, in order to realize an increase in the travel speed of the transport vehicle, a reduction in the weight of the transport vehicle as a whole is required.

For example, the stacker crane (transfer cart) of Patent Document 1 absorbs the bending moment due to the bending of the main frame of the cage due to the weight of the load by installing moment absorbing means on the main frame of the cage (elevator). And, the inclination of the side frame of the cage due to the bending of the main frame of the cage is prevented. This eliminates the need to make the main frame and side frames of the cage thick, so that the weight of the cage or the entire stacker crane can be reduced.

Japanese Unexamined Patent Publication No. 2008-81302

However, in the stacker crane (transportation platform) of Patent Document 1, the weight of the cage (elevating platform) is reduced so that the entire transport vehicle is reduced in weight by the weight of the cage (elevating platform). ) has not reached until the weight of the frame (support link) supporting the mast (elevating mast) is still required. Therefore, there is a problem that the weight of the frame (support link) becomes heavy, and as a result, the transport vehicle as a whole becomes heavy.

Accordingly, an object of the present invention is to provide a transport cart capable of reducing the weight of the entire device cart by configuring a support link supporting an elevating mast to be lightweight.

The problem to be solved by the present invention is the above, and means for solving this problem will be described next.

That is, the transport vehicle of the present invention is a transport vehicle having a platform for transporting goods, and includes a first pair of wheels arranged along the vehicle body travel direction, and a second wheel pair disposed along the vehicle body travel direction parallel to the first pair of wheels. a pair, a first wheel frame arranged along the body running direction and rotatably supporting the first wheel pair, and a first wheel frame arranged parallel to the first wheel frame along the body running direction and capable of pivoting the second wheel pair. a second wheel frame for supporting the platform, and disposed between the first wheel frame and the second wheel frame along the vehicle body travel direction and extending vertically with respect to the first wheel frame and the second wheel frame, A first support link group composed of a pair of lifting masts that guide to be able to move up and down, and a plurality of first support links supporting a first lifting mast that is one of the lifting masts of the pair of lifting masts; A second support link group comprising a plurality of second support links for supporting a second lifting mast, which is the other lifting mast, among the lifting masts, wherein the first pair of wheels and the second pair of wheels are on the side of the first lifting mast. and a first wheel arranged on the side of the second elevating mast, wherein at least one of the first wheel and the second wheel is a drive wheel, and constitutes the first support link group. Any one of the first support links that has one end connected to the attachment portion of the first wheel in the first wheel frame or the second wheel frame, and the other end connected to the first wheel frame or the second wheel frame. Any one of the second support links constituting the second support link group connected to the first elevating mast from above the two wheel frames has one end portion of the first wheel frame or the second wheel frame. In addition to being connected to the attachment portion of the second wheel, the other end thereof is positioned above the first wheel frame or the second wheel frame. It is connected to the second elevating mast.

In the above configuration, the weight of the first lifting mast (second lifting mast) is transferred to the first wheel (second wheel) in the first wheel frame (second wheel frame) via the first support link (second support link). applied to the attachment.

In the transport bogie of the present invention, in the transport bogie, a first wheel support member installed on the first wheel frame or the second wheel frame and rotatably supporting the first wheel, and the first wheel frame or the second wheel frame. A second wheel support member installed on a second wheel frame and rotatably supporting the second wheel, and one end of any first support link constituting the first support link group is configured to support the first wheel. Any one of the second support links that is connected to the attachment portion of the first wheel support member in the frame or the second wheel frame and constitutes the second support link group has one end portion attached to the first wheel frame or the first wheel support member. It is connected to the attaching portion of the second wheel support member in the second wheel frame.

In the above configuration, the weight of the first lifting mast (second lifting mast) is transferred to the first wheel support member (second wheel frame) in the first wheel frame (second wheel frame) via the first support link (second support link). It is applied to the attachment part of the wheel support member).

In the transport bogie of the present invention, in the transport bogie, any one of the first support links constituting the first support link group has one end of the first wheel frame or the second wheel frame, and the attachment of the first wheel and the other end is connected to the first elevating mast from above the first wheel frame or the second wheel frame, and which constitutes the second support link group. One second support link has one end of the first wheel frame or the second wheel frame and is connected to a position displaced from the attachment portion of the second wheel in the vehicle body running direction, and the other end thereof is connected to the first wheel frame. Or it is connected to the said 2nd elevating mast above the said 2nd wheel frame.

In the above configuration, the connection positions of the first support links (second support links) in the first wheel frame (second wheel frame) are distributed in the vehicle body traveling direction, so that a plurality of first support links (second support links) are formed. It connects between the 1st lifting mast (2nd lifting mast) and the 1st wheel frame (2nd wheel frame).

In the transport bogie of the present invention, in the transport bogie, the first wheel frame and the second wheel frame are provided with openings in their side plates.

According to the transport bogie of the present invention, one end of any one of the first support links (second support links) constituting the first support link group is connected to the first wheel (second wheel frame) in the first wheel frame (second wheel frame). second wheel), and the other end of the first support link (second support link) is connected to the first lifting mast (second lifting mast) from above the first wheel frame (second wheel frame). From the point of doing so, the weight of the first elevating mast (the second elevating mast) can be applied to the part where the transport cart travels (the part where the transport bogie touches the rail) to support the first elevating mast (the second elevating mast) The load applied to the member can be reduced. Therefore, while being able to reduce the weight of the 1st support link (2nd support link) which supports the 1st lifting mast (2nd lifting mast), the 1st wheel frame which connects the 1st support link (2nd support link) And the weight of the second wheel frame can be reduced (the member supporting the mast and the frame connecting the member supporting the mast do not need to be formed of thick members), and as a result, the weight of the transport vehicle as a whole can be reduced.

1 is a perspective view of a transport vehicle according to the present invention.
2 is a side view of a transport vehicle according to the present invention.
3 is a front view of a transport vehicle according to the present invention.
4 is a plan view of a transport vehicle according to the present invention.
Fig. 5 is an enlarged side view of the vicinity of the first wheel of the transport cart according to the present invention.

The transport cart 10 according to the present invention will be described. In the following, the vehicle body travel direction of the transport cart 10 (the longitudinal direction of the transport cart 10) is the front-back direction, and the direction orthogonal to the vehicle body travel direction of the transport cart 10 is the horizontal direction (transport cart 10 The width direction of ) is described as the left-right direction, and the direction orthogonal to the vertical direction (height direction of the transport cart 10) with respect to the body running direction of the transport cart 10 is described as the up-down direction.

The transport vehicle 10 is moved by the transport vehicle 10 to a rack (not shown) disposed facing across the rail 2 (FIG. 2, FIG. 3), which is a track of the transport vehicle 10, for example. It is installed in an automatic warehouse (not shown) for storing the conveyed goods 1.

As shown in FIGS. 1 to 4 , the transport cart 10 is supported by a rail 2 . The transport bogie 10 is on a rail 2 and has a rotatable first pair of wheels 11 and a second pair of wheels 12 .

The first pair of wheels (11) and the second pair of wheels (12) are constituted by a pair of wheels composed of a first wheel (13) and a second wheel (14). In the first pair of wheels 11 and the second pair of wheels 12, the first wheel 13 and the second wheel 14 are arranged in a straight line in the front-back direction (along the body travel direction of the transport bogie 10). do. The first pair of wheels 11 and the second pair of wheels 12 are arranged so that the respective first wheels 13 and the respective second wheels 14 are parallel to each other, and the axles 15 thereof are on the same straight line. .

The first wheel 13 is disposed on one end side of the transport cart 10 (on the side of the first elevating mast 30 to be described later). The second wheel 14 is disposed on the other end side of the transport cart 10 (the side of the second elevating mast 31 described later). At least one of the first wheel 13 or the second wheel 14 is a drive wheel and is connected to the drive motor 16 . And at least one of the 1st wheel 13 or the 2nd wheel 14 is rotated by the driving of the drive motor 16.

As shown in FIGS. 1 to 4 , the transport cart 10 mainly includes wheel frames 20 and 21 , elevating masts 30 and 31 , an upper frame 60 and a lift platform 32 .

In the transport cart 10, a pair of wheel frames 20 and 21 formed in the front-rear direction (along the vehicle body transport direction of the transport cart 10) are disposed parallel to each other in the left-right direction. Between the wheel frames 20 and 21 arranged in parallel, a pair of elevating masts 30 and 31 are disposed in the front-rear direction (along the vehicle body transporting direction of the transport cart 10). And while the upper ends of the lifting masts 30 and 31 are connected to each other by the upper frame 60, the lifting table 32 is guided so as to be able to move up and down therebetween.

The first wheel frame 20 is a frame that extends in the front-rear direction of the transport cart 10 and supports the first pair of wheels 11 so as to be able to rotate. The first wheel frame 20 supports the first wheel 13 and the second wheel 14 at both ends thereof.

The second wheel frame 21 is a frame that runs parallel to the first wheel frame 20 in the front-rear direction of the transport cart 10 in the left-right direction and supports the second pair of wheels 12 rotatably. The second wheel frame 21 supports the first wheel 13 and the second wheel 14 at both ends thereof.

The wheel frames 20 and 21 are arranged at a predetermined interval from each other (specifically, approximately the same interval as the interval of the rails 2). The wheel frames 20 and 21 are composed of a top plate 22 forming the upper surface of the wheel frames 20 and 21 and a side plate 23 forming the side surface of the wheel frames 20 and 21 . The upper plate 22 and the side plate 23 are formed of a member bent from both ends toward the central portion, and both ends are higher than the central portion.

As shown in Fig. 5, the wheel frames 20 and 21 support the first wheel 13 or the second wheel 14 at both ends, so that the upper plate 22 is connected to the upper plate 22a and the lower end. It is constituted by two plate-like members of the plate 22b. Then, by the top plate 22 (the top plate 22a, the bottom plate 22b) and the side plate 23, the attachment portion 24 for attaching the first wheel 13 or the second wheel 14 is is formed

A first wheel supporting member 17 (second wheel supporting member 18) for supporting the first wheel 13 (second wheel 14) is attached to the attachment portion 24. The wheel support members 17 and 18 have their upper end attached to the lower plate 22b of the upper plate 22, and at their lower end, the axle 15 of the first wheel 13 (second wheel 14) is attached. rotatably supported.

As shown in Fig. 1 and Fig. 2, the side plate 23 is provided with a circular opening 25 having a predetermined size. The opening 25 has a size sufficient to maintain the rigidity of the side plate 23 .

As shown in FIGS. 1 to 4 , the elevating masts 30 and 31 are vertically extended with respect to the wheel frames 20 and 21 . The elevating masts 30 and 31 are central portions between the first wheel frame 20 and the second wheel frame 21, and are disposed at both ends of the transport vehicle 10 on the same straight line in the front-back direction of the transport vehicle 10. do.

Between the first lifting mast 30 and the second lifting mast 31, a lifting table 32 for lifting the article 1 is installed so as to be able to move up and down. An article transfer device 34 for transferring articles 1 is installed on the upper surface of the platform 32 . The article transfer device 34 is constituted by a fork-type transfer device equipped with a fork for loading and supporting the article 1 so as to be able to move in and out.

An elevating device 35 is installed in the elevating masts 30 and 31 to elevate the elevating platform 32 . The elevating device 35 includes a drive unit 36 installed at the lower ends of the elevating masts 30 and 31, a driven unit 37 installed at the upper ends of the elevating masts 30 and 31, and a drive unit 36. It is mainly composed of an elevating chain 38 spanned between driven units 37 so as to be able to rotate.

As shown in Figs. 1 to 4, support link groups 40 and 50 are connected to the elevating masts 30 and 31. The elevating masts 30 and 31 are supported by the wheel frames 20 and 21 via support link groups 40 and 50.

The first support link group 40 is a link group connected between the first elevating mast 30 and the first wheel frame 20 or the second wheel frame 21 . The first support link group 40 includes a first mast support link 41 (an example of a "first support link"), a first mast rocking prevention link 42 (an example of a "first support link"), It is mainly composed of first mast torsion-preventing links 43A, 43B, and 43C (an example of "first support link").

The first mast support link 41 is a link that supports the first elevating mast 30 . The first mast support link 41 supports the first elevating mast 30 from the left-right direction of the transport cart 10 (the width direction of the transport cart 10). The first mast support link 41 has one end (lower end 41a) of the first wheel frame 20 or the upper plate 22a of the upper plate 22 of the second wheel frame 21, and the first wheel ( 13), and its other end (upper end 4lb) is connected to the first elevating mast 30 from above by the first wheel frame 20 or the second wheel frame 21 do.

The first mast swing prevention link 42 is a link that prevents the first lifting mast 30 from swinging when the transport cart 10 travels. Specifically, the first mast anti-swaying link 42 prevents the transport cart 10 from swinging in the front-rear direction in the first elevating mast 30 . The first mast anti-sway link 42 has one end (lower end 42a) of the upper plate 22a of the upper plate 22 of the first wheel frame 20 or the second wheel frame 21, and the first wheel frame 20 It connects to a position displaced from the attachment portion 24 of (13) in the front-rear direction of the transport cart 10 (the center portion side of the first wheel frame 20 or the second wheel frame 21). That is, the lower end 42a of the first mast anti-sway link 42 is positioned in the front-back direction of the transport cart 10 (first wheel frame 20 or second wheel frame) than the attachment position of the first mast support link 41. It is attached at a position shifted to the central part side of (21). In addition, the other end (upper end 42b) of the first mast anti-sway link 42 is above the first wheel frame 20 or the second wheel frame 21, and the first mast support link 41 It connects to the 1st elevating mast 30 lower than the attachment position of the upper end part 41b.

The first mast anti-torsion links 43A, 43B, and 43C prevent twisting (rotation) of the first elevating mast 30, and the width of the first wheel frame 20 and the second wheel frame 21 ( It is a link that maintains the width of the transfer cart 10). The first mast anti-torsion links 43A, 43B, and 43C support the first elevating mast 30, the first wheel frame 20, and the second wheel frame 21 in the left-right direction of the transport cart 10. .

The first mast anti-torsion link 43A has one end (wheel frame side end 43a) attached to the top plate 22a of the top plate 22 of the first wheel frame 20 or the second wheel frame 21. Connected. In addition, the other end (elevating mast side end 43b) of the first mast torsion-preventing link 43A is divided into two, and the first elevating mast 30 so that the first mast torsion-preventing link 43A is horizontal. connected to the lower end of

The first mast anti-torsion link 43B has one end (wheel frame side end 43a) connected to the upper part of the side plate 23 of the first wheel frame 20 or the second wheel frame 21, The other end (elevating mast side end 43b) is the lower end of the first elevating mast 30, and is lower than the attachment position of the other end (elevating mast side end 43b) of the first mast torsion prevention link 43A. connected to

The first mast torsion-preventing link 43C has one end (wheel frame side end 43a) attached to the top plate 22a of the top plate 22 of the first wheel frame 20 or the second wheel frame 21. While connected, the other end (elevating mast side end 43b) is the lower end of the first elevating mast 30, and the other end (elevating mast side end 43b) of the first mast anti-torsion link 43A It is connected below the installation location. That is, the first mast torsion-preventing link 43C has its other end (elevating mast side end 43b) attached to a position lower than its one end (wheel frame side end 43a), so that the first elevating mast 30 ) is inclined to the side.

The second support link group 50 is a link group connected between the second elevating mast 31 and the first wheel frame 20 or the second wheel frame 21 . The second support link group 50 includes a second mast support link 51 (an example of a “second support link”) and a second mast rocking prevention link 52 (an example of a “second support link”), It is mainly composed of two mast torsion prevention links 53A, 53B, and 53C (an example of "second support link"). In addition, the second mast support link 51, the second mast anti-sway link 52, and the second mast torsion prevention links 53A, 53B, and 53C are structured according to the first mast of the first support link group 40. Since they are the same as the support link 41, the first mast anti-swaying link 42, and the first mast torsion-preventing links 43A, 43B and 43C, their explanations are omitted.

As shown in FIGS. 1 to 4 , the first elevating mast 30 is supported in the left-right direction by a pair of first mast support links 41 . Specifically, by holding the first lifting mast 30 from the left and right directions with the upper ends 41b of the pair of first mast supporting links 41, the first lifting mast 30 is configured to move the first mast supporting link 41 ) is supported by Here, by connecting the lower end 41a of the first mast support link 41 holding the first lifting mast 30 to the attachment portion 24 of the first wheel 13, the first lifting mast 30 The weight is applied to the top of the first wheel 13. As a result, since the weight of the first elevating mast 30 can be applied to the moving part of the transport cart 10 (the part where the transport cart 10 contacts the rail 2), the first mast support link 41 ) can be reduced.

In addition, the first elevating mast 30 is supported by a pair of first mast anti-swaying links 42 in the front-rear direction. Specifically, the upper ends of a pair of first mast anti-sway links 42 having their lower ends 42a shifted from the attaching parts 24 of the first wheels 13 to the central part side of the first wheel frame 20. The first lifting mast 30 is supported by the first mast anti-sway link 42 by clamping the first lifting mast 30 from the left-right direction by (42b). The lower end 42a of the first mast anti-sway link 42 is displaced from the lower end 41a of the first mast support link 41 toward the center of the first wheel frame 20 or the second wheel frame 21. By connecting, it is possible to prevent rocking of the first lifting mast 30 in the front-back direction.

In addition, the first elevating mast 30 is supported in its torsion direction by a pair of first mast anti-torsion links 43A, 43B and 43C. Specifically, the lower end 41a of the first lifting mast 30 is clamped from the left-right direction by the lifting mast-side end portion 43b of the pair of first mast torsion-preventing links 43A and 43B, The lower end 41a of the first lifting mast 30 is clamped in the left-right direction from the obliquely upward direction by the lifting-mast-side end portion 43b of one mast torsion-preventing link 43C, so that the first lifting mast 30 is moved to the first mast. It is supported by anti-torsion links 43A, 43B and 43C.

Similarly, the second elevating mast 31 is supported in the left-right direction by a pair of second mast support links 51, and supported in the front-back direction by a pair of second mast anti-swaying links 52. and the torsion direction is supported by the second mast anti-torsion links 53A, 53B and 53C. Since the specific support method is the same as that of the first elevating mast 30, its description is omitted.

In this way, in the transport cart 10, the weight of the first lifting mast 30 (the second lifting mast 31) is set to the first weight of the first support link group 40 (the second support link group 50). The first wheel 13 (the second wheel 14) in the first wheel frame 20 (the second wheel frame 21) via the mast support link 41 (the second mast support link 51). )), the weight of the first lift mast (second lift mast) is applied to the attachment portion 24 (first wheel support member 17 (second wheel support member 18)), It can be applied to a moving portion (a portion where the transport cart 10 and the rail 2 are grounded). Therefore, the load applied to the first mast support link 41 (the second mast support link 51) can be reduced, and the entire first support link group 40 (the second support link group 50) is reduced in weight. In addition to being able to do this, the entire first wheel frame 20 (second wheel frame 21) connecting the first support link group 40 (second support link group 50) can be reduced in weight ( The first support link group 40 (the second support link group 50) and the first wheel frame 20 (the second wheel frame 21) do not need to be formed by thick members, and consequently transported. The weight of the entire bogie 10 can be reduced.

In the transport cart 10, the connection position of the first mast anti-sway link 42 (the second mast anti-sway link 52) in the first wheel frame 20 (the second wheel frame 21) The first elevating mast 30 ( It is possible to prevent rocking of the second elevating mast 31 in the front-rear direction (car body running direction).

In the transport bogie 10, the first wheel frame 20 (the second wheel frame 21 )) can be lightened.

Further, in the present embodiment, the transport cart 10 is a cart that travels on the rail 2, but it is not limited to this, and it may be a cart that travels on the ground as long as it has a lift platform for transporting articles. .

In the present embodiment, both ends of the wheel frames 20 and 21 are constituted by two plate-like members of the upper plate 22a and the lower plate 22b, but are not limited thereto, and the first wheel ( 13) Alternatively, as long as the second wheel 14 can be supported, it may be configured with a plate-like member having a thickness of one sheet.

In this embodiment, although the opening part 25 is provided in the side plate 23 of the 1st wheel frame 20 (the 2nd wheel frame 21), the 1st wheel frame 20 (the 2nd wheel frame 21 )) As long as the rigidity of the side plate 23 can be secured, the position, size, range, shape of the opening, etc. of the opening 25 are not limited to the opening 25 of the present embodiment.

In this embodiment, prevention of torsion (rotation) of the 1st lifting mast 30 (the 2nd lifting mast 31) is carried out by the left and right three 1st mast torsion prevention links 43A, 43B, 43C (2nd mast torsion) Although it is performed by the prevention links 53A, 53B, and 53C, it is not limited to this, and if twisting (rotation) of the first lifting mast 30 (the second lifting mast 31) can be sufficiently prevented, an example is If lifted, it may be performed by means of one first mast torsion prevention link on the left and right.

10: transport truck 11: first pair of wheels
12: second wheel pair 17: first wheel support member
18: second wheel support member 20: first wheel frame
21: second wheel frame 24: attachment
25: opening 30: first lifting mast
31: second lifting mast 32: lifting platform
40: 1st support link group
41: first mast support link (first support link)
42: first mast anti-sway link (first support link)
43A, 43B, 43C: first mast anti-torsion link (first support link)
50: 2nd support link group
51: second mast support link (second support link)
52: second mast anti-sway link (second support link)
53A, 53B, 53C: Second mast anti-torsion link (second support link)

Claims (5)

As a conveyance vehicle having a lift platform for conveying goods,
a first pair of wheels arranged along the running direction of the vehicle body;
a second pair of wheels disposed parallel to the first pair of wheels along a vehicle body running direction;
a first wheel frame extending along a vehicle body traveling direction and rotatably supporting the first pair of wheels;
a second wheel frame extending parallel to the first wheel frame along a body travel direction and rotatably supporting the second pair of wheels;
A pair disposed between the first wheel frame and the second wheel frame along the vehicle body running direction and vertically extending to the first wheel frame and the second wheel frame and guiding the lift platform to be able to move up and down. an elevating mast,
A first support link group composed of a plurality of first support links supporting a first lifting mast that is one of the lifting masts of the pair of lifting masts;
A second support link group comprising a plurality of second support links for supporting a second lifting mast that is the other lifting mast among the pair of lifting masts,
The first wheel pair and the second wheel pair are composed of a first wheel disposed on the side of the first lifting mast and a second wheel disposed on the side of the second lifting mast,
At least one of the first wheel and the second wheel is configured as a driving wheel,
Any one of the first support links constituting the first support link group has one end connected to the attachment portion of the first wheel in the first wheel frame or the second wheel frame, and the other end thereof. It is connected to the first elevating mast from above the first wheel frame or the second wheel frame,
Any one of the second support links constituting the second support link group has one end connected to the attachment portion of the second wheel in the first wheel frame or the second wheel frame, and the other end thereof. The transfer vehicle characterized in that it is connected to the second elevating mast from above the first wheel frame or the second wheel frame. According to claim 1,
a first wheel support member installed on the first wheel frame or the second wheel frame and rotatably supporting the first wheel;
a second wheel support member installed on the first wheel frame or the second wheel frame and rotatably supporting the second wheel;
One end of any one of the first support links constituting the first support link group is connected to an attachment portion of the first wheel support member in the first wheel frame or the second wheel frame,
Any one of the second support links constituting the second support link group has one end connected to an attachment portion of the second wheel support member in the first wheel frame or the second wheel frame, characterized in that return car. According to claim 1 or 2,
Any one of the first support links constituting the first support link group has one end of the first wheel frame or the second wheel frame and is connected to a position displaced from the attachment portion of the first wheel in the vehicle body running direction, and , the other end is connected to the first elevating mast from above the first wheel frame or the second wheel frame,
Any one of the second support links constituting the second support link group has one end of the first wheel frame or the second wheel frame and is connected to a position displaced from the attachment portion of the second wheel in the vehicle body running direction, and , the other end of which is connected to the second elevating mast from above the first wheel frame or the second wheel frame. According to claim 1 or 2,
The transport vehicle characterized in that the first wheel frame and the second wheel frame have openings provided in their side plates. According to claim 1 or 2,
Any one of the first support links constituting the first support link group has one end of the first wheel frame or the second wheel frame and is connected to a position displaced from the attachment portion of the first wheel in the vehicle body running direction, and , the other end is connected to the first elevating mast from above the first wheel frame or the second wheel frame,
Any one of the second support links constituting the second support link group has one end of the first wheel frame or the second wheel frame and is connected to a position displaced from the attachment portion of the second wheel in the vehicle body running direction, and , the other end is connected to the second elevating mast from above the first wheel frame or the second wheel frame,
The transport vehicle characterized in that the first wheel frame and the second wheel frame have openings provided in their side plates.

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