Undercarriage

Abstract

To simply construct a device for limiting rotation of an arm with respect to a car body and to reduce the number of components of the device.SOLUTION: A jack positioning device 50 comprises: a link 53; an arm side bracket 61 provided in an arm 30; and a fixing member 71. The link 53 is rotatably fitted to a car body 10. When the arm 30 is in a first state, the fixing member 71 is fitted to the link 53 and the arm side bracket 61 so as to limit rotation of the arm 30 with respect to the car body 10. When the arm 30 is in a second state, the link 53 is configured to be able to come into contact with a side plate (arm side plate 31) of the arm 30 so as to limit rotation of the arm 30 with respect to the car body 10.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a lower running body equipped with a jack device. [Background technology]

[0002] For example, Patent Document 1 discloses a conventional undercarriage (see FIG. 2 in the document). This undercarriage is equipped with a jack device (a beam and a jack cylinder in the document) for lifting a car body (a truck frame in the document) (see FIGS. 2 to 4 in the document). The jack device is equipped with an arm (a beam in the document). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-177432 A Summary of the Invention [Problem to be solved by the invention]

[0004] The arm of the jack device may be changed between a stored state in which it is stored in the car body and an extended state in which it is extended from the car body. In this case, it is necessary to limit (position) the rotation of the arm relative to the car body in each of the stored state and the extended state. If a member for limiting the rotation of the arm in the stored state and a member for limiting the rotation of the arm in the extended state are provided separately, the number of parts for limiting the rotation of the arm relative to the car body increases (details will be described later). It is desirable to configure the device for limiting the rotation of the arm relative to the car body as simply as possible and to reduce the number of parts of this device as much as possible.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a lower running body that has a simple structure for restricting the rotation of an arm relative to a car body and that can reduce the number of parts of the device. [Means for solving the problem]

[0006] The undercarriage includes a car body, a jack device, and a jack positioning device. The jack device has an arm rotatably attached to the car body. The jack positioning device positions the arm relative to the car body. The car body includes an upper car body and a lower car body. The lower car body is disposed below the upper car body. The arm is disposed between the upper car body and the lower car body, and is rotatably attached to the car body so as to be variable between a first state and a second state. One of the first state and the second state is a protruding state in which the arm is protruding from the car body. The other of the first state and the second state is a stored state in which the arm is stored relative to the car body. The jack positioning device includes a link, an arm side bracket, and a fixing member. The link is rotatably attached to the car body. The arm side bracket is provided on the arm. The fixing member can be attached to the link and the arm side bracket. When the arm is in the first position, the fixing member is attached to the link and the arm-side bracket to limit rotation of the arm relative to the carbody, and when the arm is in the second position, the link is configured to be able to contact the side plate of the arm to limit rotation of the arm relative to the carbody. Effect of the Invention

[0007] With the above-described configuration, the device for limiting the rotation of the arm relative to the car body can be configured simply, and the number of parts of this device can be reduced. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a view of the lower running body 1 as seen from the upper side Z1. [Diagram 2]2 is a perspective view showing an arm 30 and the like in a stored state shown in FIG. 1. FIG. [Diagram 3] FIG. 3 is an enlarged view of part F3 in FIG. 2. [Figure 4] 1, as viewed from the outer side Xo in the front-rear direction of the car body, and is a view taken along the arrow F4 in FIG. [Diagram 5] 5 is a view of the jack positioning device 50 shown in FIG. 4 as viewed from the car body front-rear direction X. FIG. [Figure 6] 2 is a perspective view showing an arm 30 and the like in the extended state shown in FIG. 1. FIG. [Figure 7] FIG. 7 is an enlarged view of part F7 in FIG. [Figure 8] 2 is a view of the arm 30 in the extended state shown in FIG. 1 as viewed from the lateral direction Y of the car body. [Figure 9] 9 is a cross-sectional view taken along the line F9-F9 in FIG. 8. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The lower traveling body 1 shown in FIG. 1 will be described with reference to FIGS.

[0010] The lower traveling body 1 allows the work machine to travel. The work machine having the lower traveling body 1 is a machine that performs work, such as a construction machine that performs construction work, and specifically, such as a crane. The lower traveling body 1 includes a crawler 1c, a car body 10, a jack device 20, and a jack positioning device 50 (see FIG. 2).

[0011] The crawlers 1c move the lower traveling body 1. The crawlers 1c are provided on both sides (left and right) of the car body 10 in the car body lateral direction Y. For example, the crawlers 1c are detachable from the car body 10. Details of the directions such as the "car body lateral direction Y" will be described later.

[0012] The car body 10 is the main body of the undercarriage 1. The left and right crawlers 1c·1c are attached to the car body 10. The car body 10 includes a car body main body 10a, an axle 10b, a car body side portion 11 shown in FIG. 2, a car body upper portion 13, a car body lower portion 15, and a reinforcing bracket 17.

[0013] (direction) A direction related to the lower running body 1 that coincides (or nearly coincides) with the vertical direction when the lower running body 1 is placed on a horizontal plane is defined as the up-down direction Z (upper side Z1, lower side Z2). A direction perpendicular (or nearly perpendicular) to the car body side 11 is defined as the car body front-rear direction X. In the car body front-rear direction X, the side where the arm 30 (described later) in the extended state shown in FIG. 6 protrudes from the car body side 11 is defined as the car body front-rear outer side Xo, and the opposite side is defined as the car body front-rear inner side Xi. As shown in FIG. 2, a direction that intersects (for example, perpendicular) with each of the car body front-rear direction X and the up-down direction Z is defined as the car body lateral direction Y. The car body front-rear direction X, the car body lateral direction Y, and the up-down direction Z may be perpendicular or nearly perpendicular to each other.

[0014] As shown in Fig. 1, the car body main body 10a is provided in the center of the car body 10. The car body main body 10a is a portion to which an upper rotating body (not shown) is attached via a rotating bearing (not shown). The axle 10b has portions provided so as to protrude from the car body main body 10a on both sides outside the car body in the lateral direction Y. A crawler 1c is attached to the axle 10b. The car body main body 10a and the axle 10b may be provided integrally or may be separate bodies (assemblable, connectable).

[0015] As shown in FIG. 2, the car body side 11 is a portion that faces the arm 30 when the arm 30 is in a stored state. The car body side 11 is a portion that becomes a side surface (a surface facing horizontally or approximately horizontally) of the car body 10. For example, the car body side 11 is plate-shaped (side plate). The car body side 11 is provided so as to extend in the car body lateral direction Y and the up-down direction Z. As shown in FIG. 1, the car body side 11 is provided on both sides (front and rear parts) of the car body 10 in the car body front-rear direction X. The car body side 11 is provided on at least one of the car body main body 10a and the axle 10b (the same is true for the car body upper part 13 and the car body lower part 15).

[0016] 2, the car body upper part 13 is a part of the upper side Z1 of the car body 10. For example, the car body upper part 13 is a plate-like shape (upper plate, top plate) or the like. The car body upper part 13 is provided so as to extend in the car body front-rear direction X and the car body lateral direction Y.

[0017] The car body lower part 15 is a part of the lower side Z2 of the car body 10. The car body lower part 15 is disposed on the lower side Z2 than the car body upper part 13. For example, the car body lower part 15 is plate-shaped (lower plate, bottom plate) or the like. For example, the car body lower part 15 is provided so as to extend in the car body front-rear direction X and the car body lateral direction Y.

[0018] As shown in FIG. 4, the reinforcing bracket 17 is disposed so as to fill the gap between the arm 30 and the car body upper part 13 (more specifically, the gap in the vertical direction Z). The reinforcing bracket 17 reinforces the connection part between the car body 10 and the arm 30. For example, the reinforcing bracket 17 is provided so as to protrude from the car body upper part 13 to the lower side Z2. The reinforcing bracket 17 is fixed to the car body upper part 13. The reinforcing bracket 17 may be provided so as to protrude from the car body lower part 15 to the upper side Z1, and may be fixed to the car body lower part 15, for example (not shown). Compared with the case where the reinforcing bracket 17 protrudes from the car body lower part 15 to the upper side Z1, when the reinforcing bracket 17 protrudes from the car body upper part 13 to the lower side Z2, the cylinder device 40 can be made shorter. The reinforcing bracket 17 may be provided on each of the upper side Z1 and the lower side Z2 of the arm 30.

[0019] As shown in FIG. 2, the reinforcing bracket 17 is provided so as to protrude from the car body side portion 11 toward the outer side Xo in the front-rear direction of the car body. The reinforcing bracket 17 is fixed to the car body side portion 11. The reinforcing bracket 17 is arranged so that a gap (more specifically, a gap in the up-down direction Z) is provided between the reinforcing bracket 17 and the car body lower portion 15. For example, the reinforcing bracket 17 is rectangular or approximately rectangular when viewed from the car body front-rear direction X (see FIG. 4). For example, the reinforcing bracket 17 is rectangular or approximately rectangular when viewed from the car body lateral direction Y. For example, the reinforcing bracket 17 may be rectangular, cylindrical, semi-cylindrical, or a shape similar thereto (for example, approximately rectangular, etc.) when viewed from the up-down direction Z. The size and strength of the reinforcing bracket 17 are set according to conditions such as the length in the up-down direction Z of the car body 10 and the arm 30, the mass of the lower running body 1 and the upper rotating body (not shown), and the strength required for the arm 30 and its surroundings. Depending on these conditions, the reinforcing bracket 17 may not be provided.

[0020] As shown in Fig. 1, the jack device 20 is a device for lifting the lower traveling body 1 above the ground. For example, the jack device 20 is used for attaching and detaching the crawler 1c to and from the car body 10. A plurality of jack devices 20 (for example, four) are provided. Below, one jack device 20 will be described. The jack device 20 includes an arm 30 and a cylinder device 40.

[0021] The arm 30 is a structure that connects the car body 10 and the cylinder device 40. The arm 30 is rotatably attached to the car body 10. As shown in FIG. 2, the arm 30 is attached to the car body upper part 13 and the car body lower part 15. For example, the arm 30 may be attached to the car body upper part 13 via a reinforcing bracket 17, or may be attached to the car body lower part 15 via a reinforcing bracket 17 (not shown). The arm 30 is rotatable in a horizontal direction relative to the car body 10. As shown in FIG. 1, the rotation axis of the arm 30 relative to the car body 10 is the arm rotation axis 30a. The direction in which the arm rotation axis 30a extends is the vertical direction Z or approximately the vertical direction Z (see FIG. 4). As shown in FIG. 2, the part of the arm 30 that is attached to the car body 10 is the arm base end part 30b, and the part opposite to the part attached to the car body 10 is the arm tip part 30t. A direction that intersects with the arm rotation axis 30a and connects the arm base end 30b and the arm tip end 30t is defined as an arm front-rear direction A.

[0022] The arm 30 is rotatably attached to the car body 10 so as to be variable between a stored state shown in FIG. 2 and an extended state shown in FIG. 6. As shown in FIG. 2, the stored state is a state in which the arm 30 is stored relative to the car body 10, and more specifically, a state in which the car body side 11 and a side plate of the arm 30 (an arm side plate 31 described later) are arranged parallel or approximately parallel. The "state" of the stored state is the arrangement (posture) of the arm 30 relative to the car body 10 (the same applies to the extended state, the first state, and the second state). As shown in FIG. 6, the extended state is a state in which the arm 30 is extended relative to the car body 10, and more specifically, a state in which the arm 30 is extended so as to protrude from the car body side 11 toward the outer side Xo in the front-rear direction of the car body.

[0023] The arm 30 is rotatably attached to the car body 10 so as to be variable between a first state shown in FIG. 2 and a second state shown in FIG. 6. As shown in FIG. 2, the first state is a state of the arm 30 in which the rotation of the arm 30 relative to the car body 10 can be restricted by a fixing member 71 (described later). As shown in FIG. 6, the second state is a state of the arm 30 in which the rotation of the arm 30 relative to the car body 10 can be restricted by a link 53 (described later) contacting a side plate (arm side plate 31 described later) of the arm 30. One of the first state and the second state is a stretched state, and the other is a stored state. In the following, a case will be mainly described in which the stored state is the first state as shown in FIG. 2 and the stretched state is the second state as shown in FIG. 6.

[0024] As shown in FIG. 4, the arm 30 is disposed between the car body upper part 13 and the car body lower part 15 (in the vertical direction Z). For example, the arm 30 is disposed between the reinforcing bracket 17 and the car body lower part 15 (in the vertical direction Z). More specifically, the arm base end part 30b is disposed between the car body upper part 13 and the car body lower part 15. For example, the arm base end part 30b is disposed between the reinforcing bracket 17 and the car body lower part 15. When viewed from a direction perpendicular to an arm side plate 31 described later, the arm 30 is substantially rectangular or the like in the example shown in FIG. 4, and may be substantially triangular or the like. The arm 30 may have a box-shaped (hollow) structure. The arm 30 includes an arm side plate 31 and an arm side plate connecting part 33 (see FIG. 2).

[0025] The arm side plate 31 (side plate of the arm 30) is provided on the outer portion of the arm 30 in the width direction, as shown in FIG. 2. The arm side plate 31 is plate-shaped. The arm side plate 31 is provided so as to extend in the up-down direction Z and the arm front-rear direction A. A plurality of arm side plates 31 (for example, two) are provided. The multiple arm side plates 31 are arranged parallel to each other (or approximately parallel to each other). Of the two arm side plates 31, when the arm 30 is in the stored state, the one closer to the car body side 11 is designated as the first arm side plate 31a, and the one farther from the car body side 11 is designated as the second arm side plate 31b.

[0026] The arm side plate connecting portion 33 is provided to connect the multiple arm side plates 31 to each other. The arm side plate connecting portion 33 is fixed to each of the multiple arm side plates 31. The arm side plate connecting portion 33 may comprise, for example, a plate-shaped member or a block-shaped member.

[0027] The cylinder device 40 (translifter) (see FIG. 1) is a device equipped with a telescopic cylinder. The cylinder device 40 is rotatably attached to the arm 30 so that it can be changed between a stored state (see FIG. 4) and a usable state (see the cylinder device 40 shown by solid lines in FIG. 1) (details will be described later). For example, as shown in FIG. 1, the cylinder device 40 includes a cylindrical cylinder tube 40a, a cylinder rod 40b, and a float 40c. The cylinder rod 40b is a member inserted into the cylinder tube 40a and moves in the longitudinal direction of the cylinder tube 40a. The float 40c comes into contact with the ground via, for example, a floor plate.

[0028] 2, the jack positioning device 50 (translifter positioning device) positions the arm 30 relative to the car body 10. As a result, the jack positioning device 50 positions the jack device 20 relative to the car body 10. The jack positioning device 50 is provided on the car body 10 and the arm 30. The jack positioning device 50 includes a link attachment portion 51, a link 53, a link rotation shaft portion 55, an arm side bracket 61, an arm side contact portion 63, and a fixing member 71.

[0029] As shown in FIG. 3, the link mounting portion 51 is a portion (bracket) to which the link 53 is attached. The link mounting portion 51 is fixed to the car body 10. For example, the link mounting portion 51 is fixed to the car body side portion 11. The link mounting portion 51 is provided so as to protrude from the car body 10 to the outer side Xo in the car body front-rear direction. The link mounting portion 51 is, for example, plate-shaped. The link mounting portion 51 includes a link mounting portion main body 51a and a link rotation limiting portion 51c. The link mounting portion main body 51a is a main body portion of the link mounting portion 51 and is, for example, plate-shaped. For example, the link mounting portion main body 51a is provided so as to extend in the up-down direction Z and the car body front-rear direction X. The link rotation limiting portion 51c limits the rotation of the link 53 relative to the link mounting portion 51 (relative to the car body 10). 8, when the link 53 is in a restricted position (described later), the link rotation limiting portion 51c limits the rotation of the link 53 relative to the link mounting portion 51 and supports the link mounting portion 51 from the lower side Z2. For example, the link rotation limiting portion 51c is provided so as to protrude from the link mounting portion main body 51a in the car body lateral direction Y. The link rotation limiting portion 51c does not have to be provided on the link mounting portion 51, and may be provided on the arm 30, for example.

[0030] As shown in FIG. 2, the link 53 is rotatably attached to the car body 10. The link 53 is rotatable, for example, in the vertical direction Z with respect to the car body 10 (see FIG. 2 and FIG. 6). The link 53 is attached to the car body 10, for example, via a link attachment portion 51. As shown in FIG. 6, the link 53 is rotatable, for example, in the vertical direction Z with respect to the car body 10 so as to be variable between a restricted position and an unrestricted position (see the link 53 shown by the two-dot chain line in FIG. 6) with respect to the car body 10 in the second state (for example, the extended state) (details of each position will be described later). For example, the link 53 is rotatable in the vertical direction Z and the car body front-rear direction X (see FIG. 2 and FIG. 6). As shown in FIG. 3, the link 53 includes a link main body 53a, a link side fixing member attachment portion 53c, and a link side contact portion 53e.

[0031] The link body 53a is a main body portion of the link 53. For example, the link body 53a includes a link plate 53a1 and a link plate connecting portion 53a2. The link plate 53a1 is a plate-shaped member. Two link plates 53a1 are provided. The two link plates 53a1 and 53a1 are arranged parallel to each other (or approximately parallel to each other). For example, the link plate 53a1 is provided so as to extend in the up-down direction Z and the car body front-rear direction X. The link plate connecting portion 53a2 connects the two link plates 53a1 and 53a1 to each other and fixes them to each other. The link plate connecting portion 53a2 may be plate-shaped or block-shaped.

[0032] 5, the link side fixing member attachment portion 53c is a portion to which the fixing member 71 is attached when the arm 30 is in a first state (e.g., a stored state). The link side fixing member attachment portion 53c is provided (e.g., formed) on the link main body 53a. The link side fixing member attachment portion 53c is a hole (e.g., a pin hole) to which the fixing member 71 can be attached.

[0033] As shown in FIG. 6, the link side contact portion 53e is a portion capable of contacting the arm side plate 31 so as to restrict the rotation of the arm 30 relative to the car body 10 when the arm 30 is in the second state (e.g., the extended state). For example, the link side contact portion 53e is a part of the link plate 53a1. As shown in FIG. 9, for example, the link side contact portion 53e constitutes a clamping portion 53e1. The clamping portion 53e1 is configured so as to be able to be disposed so as to clamp a clamped portion 63a (specifically, the arm side plate 31) described later. For example, the link side contact portion 53e is a surface of the two link plates 53a1 and 53a1, and is a surface (inner surface) of the two link plates 53a1 and 53a1 facing each other.

[0034] As shown in FIG. 5, the link rotation shaft 55 is a portion that becomes a rotation shaft of the link attachment portion 51 relative to the car body 10. The link rotation shaft 55 is attached to the link attachment portion 51 and the link body 53a (more specifically, the two link plates 53a1-53a1). For example, the link rotation shaft 55 is a columnar or cylindrical member (specifically, a pin). For example, the link rotation shaft 55 is inserted into a pin hole provided in each of the link attachment portion 51 and the link body 53a. As shown in FIG. 3, a retaining member (for example, a retaining pin) for preventing the link rotation shaft 55 from coming off from the link attachment portion 51 and the link body 53a may be attached to the link rotation shaft 55. For example, the link rotation shaft 55 includes a link rotation shaft main body 55a and a fixing member storage portion 55c. The link rotation shaft main body 55a is a portion that connects the car body 10 and the link 53. The link rotation shaft body 55a is cylindrical or cylindrical. For example, the link rotation shaft body 55a is inserted into the link attachment portion 51 and the link 53.

[0035] As shown in FIG. 7, the fixed member storage section 55c is configured to be able to store the fixed member 71. The fixed member storage section 55c is provided (for example, fixed) to the link rotation shaft main body 55a. The fixed member storage section 55c is provided at an end in the longitudinal direction of the link rotation shaft main body 55a. The fixed member storage section 55c is disposed outside the end in the longitudinal direction of the link rotation shaft main body 55a. The fixed member storage section 55c is disposed outside the link 53 in the direction in which the two link plates 53a1·53a1 face each other. The fixed member storage section 55c has a structure capable of storing (for example, being able to hold, be attached, etc.) the fixed member 71. For example, when the fixed member 71 is a pin, the fixed member storage section 55c may have a hole into which the fixed member 71 can be inserted. The fixing member storage portion 55c may be used as a handle to facilitate attachment and detachment of the link rotation shaft portion 55.

[0036] As shown in FIG. 3, the arm side bracket 61 is a portion to which the fixing member 71 is attached when the arm 30 is in a first state (e.g., a stored state). The arm side bracket 61 is provided on the arm 30 and, for example, fixed to the arm 30. The arm side bracket 61 may be provided on the arm side plate 31 or on the arm side plate connecting portion 33. The arm side bracket 61 may be provided on, for example, one of the two arm side plates 31, 31 or on both (not shown). In the example shown in FIG. 3, the arm side bracket 61 is provided on the first arm side plate 31a. The arm side bracket 61 may be disposed between the two arm side plates 31, 31. The arm side bracket 61 may be disposed so as to protrude from the arm side plate 31 in the car body front-rear direction X when the arm 30 is in the stored state. Specifically, for example, the arm side bracket 61 may protrude from the first arm side plate 31a toward the outer side Xo in the front-rear direction of the car body, and may protrude from the second arm side plate 31b toward the inner side Xi in the front-rear direction of the car body. The arm side bracket 61 is, for example, plate-shaped. The arm side bracket 61 includes an arm side bracket main body 61a and an arm side fixing member attachment portion 61c. The arm side bracket main body 61a is the main body of the arm side bracket 61 and is, for example, plate-shaped.

[0037] The arm side fixing member attachment portion 61c is a portion to which the fixing member 71 is attached when the arm 30 is in a first state (e.g., a stored state). The arm side fixing member attachment portion 61c is provided (e.g., formed) on the arm side bracket main body portion 61a. When the fixing member 71 is a columnar or cylindrical member (pin), the arm side fixing member attachment portion 61c is a hole (pin hole) or the like formed in the arm side bracket main body portion 61a. The arm side fixing member attachment portion 61c may be a circular hole or an elongated hole that is long in the vertical direction Z. When the arm side fixing member attachment portion 61c is an elongated hole that is long in the vertical direction Z, the fixing member 71 can be easily inserted into the link side fixing member attachment portion 53c (see FIG. 5) and the arm side fixing member attachment portion 61c even if their positions are misaligned in the vertical direction Z.

[0038] As shown in FIG. 6, when the arm 30 is in the second state (e.g., the extended state), the arm side contact portion 63 contacts the link side contact portion 53e so as to restrict the rotation of the arm 30 relative to the car body 10. The arm side contact portion 63 is a part of the arm side plate 31 (see FIG. 2). For example, the arm side contact portion 63 is provided on the arm base end portion 30b of the arm side plate 31. As shown in FIG. 4, for example, the arm side contact portion 63 may be provided on the center portion of the arm side plate 31 in the vertical direction Z. In the example shown in FIG. 4, the arm side contact portion 63 is disposed closer to the arm tip end portion 30t than the arm rotation shaft 30a. As shown in FIG. 9, the arm side contact portion 63 includes a clamped portion 63a.

[0039] The sandwiched portion 63a is a portion that can be sandwiched by the sandwiching portion 53e1. As shown in FIG. 7, the sandwiching portion 53e1 is disposed to sandwich the sandwiched portion 63a so as to restrict the rotation of the arm 30 relative to the car body 10 when the arm 30 is in the second state. In the example shown in FIG. 9, the sandwiched portion 63a is provided on the arm side plate 31, and the sandwiching portion 53e1 is provided on the link 53. Specifically, for example, the sandwiched portion 63a is both sides of the arm side plate 31 that face the thickness direction of the arm side plate 31. The sandwiching portion 53e1 is the inner surfaces (opposing surfaces) of the two link plates 53a1 and 53a1. Note that the sandwiched portion 63a may be provided on the link 53, and the sandwiching portion 53e1 may be provided on the arm side plate 31 (not shown). In this case, for example, the arm side plate 31 (eg, the second arm side plate 31b) on one width direction side of the arm 30 shown in FIG. 3 may have a plurality of plates, and the link 53 may be provided with only one link plate 53a1.

[0040] As shown in FIG. 4, the fixing member 71 is a member that limits the rotation of the arm 30 relative to the car body 10 when the arm 30 is in the first state (for example, the stored state). The fixing member 71 can be attached (for example, inserted) to the link 53 and the arm side bracket 61. As shown in FIG. 5, the fixing member 71 can be attached (for example, inserted) to the link side fixing member attachment portion 53c and the arm side fixing member attachment portion 61c. The fixing member 71 is, for example, a columnar or cylindrical member (pin). As shown in FIG. 2, when the arm 30 is in the first state, the direction of the central axis of the fixing member 71 is, for example, the car body lateral direction Y. As shown in FIG. 3, a slip-out prevention member (for example, a slip-out prevention pin) for preventing the fixing member 71 from slipping out of the link 53 and the arm side bracket 61 may be attached to the fixing member 71. A handle for facilitating attachment and detachment of the fixing member 71 may be provided on the fixing member 71.

[0041] (Storage state, etc.) As shown in FIG. 2, when the jack device 20 is stored in the car body 10, the arm 30, the cylinder device 40 (see FIG. 4), and the jack positioning device 50 are arranged as follows. The arm 30 is in a stored state. At this time, the arm 30 is arranged so as to be aligned along the car body side 11. For example, the arm front-rear direction A is the car body lateral direction Y or approximately the car body lateral direction Y. At this time, the arm 30 is arranged in an area (storage space S) surrounded by the car body upper part 13, the car body lower part 15, and the car body side part 11. Note that a part of the arm 30 may protrude from at least a part of the car body upper part 13 and the car body lower part 15 to the car body front-rear direction outer side Xo.

[0042] As shown in Fig. 4, when the arm 30 is in the stored state, the cylinder device 40 is stored. At this time, the cylinder device 40 is arranged so as to be along the upper side Z1 portion of the arm 30. For example, the longitudinal direction of the cylinder device 40 is horizontal or approximately horizontal. For example, the longitudinal direction of the cylinder device 40 is inclined with respect to the vertical direction.

[0043] As shown in Fig. 5, when the arm 30 is in the stored state, the link 53 is disposed at a position where the fixing member 71 can be attached to the link side fixing member attachment portion 53c and the arm side fixing member attachment portion 61c. For example, as shown in Fig. 3, the link 53 is in an upright position. More specifically, the link 53 is disposed so that the link side fixing member attachment portion 53c is disposed on the upper side Z1 of the link rotation shaft portion 55. Note that when the arm 30 is in the stored state, the link 53 does not have to be in the upright position as described above.

[0044] When the arm 30 is in the stored state, the fixing member 71 is attached to the link 53 and the arm side bracket 61 so as to limit the rotation of the arm 30 relative to the car body 10. More specifically, as shown in Fig. 5, the fixing member 71 is attached to the link side fixing member attachment portion 53c and the arm side fixing member attachment portion 61c. At this time, the axial direction of the fixing member 71 is a direction different from the rotation direction of the arm 30 relative to the car body 10, for example, the arm front-rear direction A, and for example, the car body lateral direction Y.

[0045] (extension state, etc.) As shown in Fig. 6, when the jack device 20 is extended from the car body 10, the arrangement of the arm 30, the cylinder device 40, and the jack positioning device 50 is as follows. The arm 30 is in an extended state. At this time, the arm 30 is disposed so as to protrude from the car body side portion 11 to the outside in the car body longitudinal direction Xo. For example, the arm longitudinal direction A is the car body longitudinal direction X or approximately the car body longitudinal direction X.

[0046] As shown by the solid line in Fig. 1, when the arm 30 is in an extended state, the cylinder device 40 is disposed so as to extend in the vertical direction Z. More specifically, the longitudinal direction of the cylinder tube 40a and the cylinder rod 40b (see Fig. 1) shown in Fig. 4 is the vertical direction Z or approximately the vertical direction Z.

[0047] As shown in Fig. 6, when the arm 30 is in the extended state, the link 53 can be placed in the restriction release position (see the link 53 shown by the two-dot chain line in Fig. 6). The restriction release position is the position of the link 53 when the restriction on the rotation of the arm 30 about the arm rotation axis 30a (see Fig. 4) relative to the car body 10 is released. When the link 53 is in the restriction release position, the arm 30 becomes rotatable relative to the car body 10. At this time, the link side contact portion 53e (clamping portion 53e1) is positioned so as not to pinch the arm side plate 31 (clamped portion 63a) and is positioned away from the arm side plate 31.

[0048] When the arm 30 is in the extended state, the link 53 can be placed in a limiting position (see the link 53 shown by a solid line in FIG. 6). The limiting position is the position (angle, posture) of the link 53 when the rotation of the arm 30 around the arm rotation axis 30a (see FIG. 4) relative to the car body 10 is limited. At this time, the link side contact portion 53e shown in FIG. 9 is placed so as to be able to contact the arm side plate 31 (e.g., the second arm side plate 31b). At this time, when the arm 30 tries to rotate relative to the car body 10 shown in FIG. 1, the link side contact portion 53e and the arm side contact portion 63 shown in FIG. 9 come into contact with each other, thereby restricting the rotation of the arm 30 relative to the car body 10 shown in FIG. 1. At this time, as shown in FIG. 9, the clamping portion 53e1 (e.g., the link side contact portion 53e) is placed so as to clamp the clamped portion 63a (e.g., the arm side plate 31, e.g., the second arm side plate 31b). In this case, no matter in which direction the arm 30 rotates around the arm rotation axis 30a relative to the car body 10 shown in Figure 1, the clamping portion 53e1 shown in Figure 9 comes into contact with the clamped portion 63a, thereby restricting the rotation of the arm 30 relative to the car body 10 shown in Figure 1.

[0049] The restriction on the rotation of the arm 30 relative to the car body 10 can be modified in various ways. For example, when the arm 30 is in the extended state, the rotation of the arm 30 relative to the car body 10 may be permitted only in the direction toward the stored state. For example, when the arm 30 is in the extended state, the car body 10 and the arm 30 may be provided with a structure that restricts the arm 30 from rotating in the direction opposite to the direction toward the stored state. In such a case, the link 53 (link side contact portion 53e) shown in FIG. 6 may restrict the rotation of the arm 30 in the direction toward the stored state. In this case, the link 53 does not need to have the clamping portion 53e1. The link 53 does not need to have two link plates 53a1. Also,

[0050] An appropriate gap is provided between the link side contact portion 53e and the arm side contact portion 63 shown in Fig. 9. More specifically, when the link 53 is in the restricted position and the link side contact portion 53e and the arm side contact portion 63 are not in contact with each other, an appropriate gap (specifically, for example, 3 mm) is provided between the link side contact portion 53e and the arm side contact portion 63. Thus, the link 53 shown in Fig. 6 can move smoothly between the restricted position and the non-restricted position (see the link 53 indicated by the two-dot chain line in Fig. 6).

[0051] When the arm 30 is in the extended state, the fixing member 71 is preferably stored. For example, as shown in Fig. 7, the fixing member 71 is stored in the fixing member storage section 55c. In this case, the worker can store the fixing member 71 in the fixing member storage section 55c immediately after removing the fixing member 71 from the link side fixing member attachment section 53c and the arm side fixing member attachment section 61c shown in Fig. 5. Note that a member for storing the fixing member 71 may be provided in a portion other than the link rotation shaft section 55 (e.g., the car body 10, the arm 30, etc.).

[0052] (About rotation restriction by link 53) The link 53 shown in FIG. 2 may be used to limit the rotation of the arm 30 when the arm 30 is in the stored state and in the extended state. The link 53 does not have to limit the rotation of the arm 30 by itself. For example, in the above embodiment, when the arm 30 is in the stored state, the rotation of the arm 30 is limited not by the link 53 by itself but by the link 53 and the fixing member 71. Also, for example, in the above embodiment, when the arm 30 is in the extended state as shown in FIG. 6, the link 53 (by itself) limits the rotation of the arm 30. On the other hand, the link 53 may limit the rotation of the arm 30 in one direction, and for example, the above-mentioned "structure that limits the rotation of the arm 30 in the direction opposite to the direction toward the stored state" may limit the rotation of the arm 30 in the other direction (the direction opposite to the above-mentioned "one direction").

[0053] (Consider) As shown in FIG. 4, when the jack device 20 is stored in the car body 10, the arm 30 and the cylinder device 40 are stored in the storage space S with the cylinder device 40 tilted with respect to the vertical direction. Here, consider a case where the reinforcing bracket 17 is not provided and the upper side Z1 portion of the arm 30 is disposed directly below the car body upper part 13. In this case, it may be possible to insert a member (e.g., a pin) that fixes the position of the arm 30 relative to the car body 10 into the car body upper part 13 and the arm 30 from the upper side Z1 of the car body upper part 13. On the other hand, the gap between the upper side Z1 portion of the arm 30 and the car body upper part 13 may be filled with the reinforcing bracket 17. In this case, it is impossible or difficult to insert a member that fixes the position of the arm 30 relative to the car body 10 into the car body upper part 13 and the arm 30 from the upper side Z1 of the car body upper part 13.

[0054] The reason why the reinforcing bracket 17 is provided between the upper side Z1 portion of the arm 30 and the car body upper part 13 is, for example, as follows. For example, the greater the height (length in the vertical direction Z) of the car body 10 is and the greater the distance between the car body upper part 13 and the car body lower part 15 is, the greater the height of the arm base end part 30b may be. In this case, if the height of the arm base end part 30b is increased, the strength of the arm 30 can be ensured, but the mass of the arm 30 increases. Therefore, when an object including the arm 30 is transported, the mass of the transported object exceeds the limit value (more specifically, the mass limit value when transporting the object on a public road using a vehicle). Or, disassembly work is required so that the mass of the transported object does not exceed the limit value. Also, if the height of the arm base end part 30b is increased, the space in which the cylinder device 40 is to be stored is occupied by the arm base end part 30b, making it difficult or impossible to store the cylinder device 40. Therefore, in order to ensure the strength of the arm 30 and its surrounding parts while securing space to store the cylinder device 40, the gap between the upper Z1 portion of the arm base end 30b and the upper part 13 of the car body may be filled with a reinforcing bracket 17.

[0055] When the reinforcing bracket 17 is provided, a member (e.g., a pin) for fixing the position of the arm 30 relative to the car body 10 cannot be inserted into the car body upper part 13 from the upper side Z1 of the car body upper part 13. Therefore, a link structure may be provided to fix the position of the arm 30 relative to the car body 10. This "link structure" is a structure including a plate-like member (plate) provided on the car body 10, a plate-like member provided on the arm 30, and a member (e.g., a pin) for connecting these plate-like members. In this case, if a link structure for fixing the arm 30 when the arm 30 is in the extended state (see FIG. 6) and a link structure for fixing the position of the arm 30 when the arm 30 is in the stored state are separately provided, the number of parts of the link device increases, resulting in a complex structure. In addition, for example, when the plate of the link structure provided on the arm 30 or the car body 10 is configured to be rotatable with respect to the arm 30 (or the car body 10), the number of parts further increases.

[0056] On the other hand, in the lower traveling body 1 of this embodiment, the link 53 is used both to limit the rotation of the arm 30 when the arm 30 is in the first state shown in FIG. 2 and to limit the rotation of the arm 30 when the arm 30 is in the second state shown in FIG. 6. Furthermore, the arm side plate 31 is used to limit the rotation of the arm 30 when the arm 30 is in the second state. Therefore, the device (jack positioning device 50) for limiting the rotation of the arm 30 relative to the car body 10 can be configured simply, and the number of parts of the jack positioning device 50 can be reduced. Specifically, for example, the jack positioning device 50 uses five plates, namely, the link mounting portion 51 shown in FIG. 7, two link plates 53a1, the link plate connecting portion 53a2, and the arm side bracket 61 (see FIG. 3). Also, for example, the jack positioning device 50 uses two pins, namely, the link rotation shaft portion 55 and the fixing member 71. The above number of parts does not include parts that are not directly related to limiting the rotation of the arm 30, such as a retaining pin or a handle. If the reinforcing bracket 17 is not provided, a jack positioning device 50 may be provided.

[0057] (Effects of the first invention) The effects of the lower traveling body 1 shown in FIG. 1 are as follows. The lower traveling body 1 includes a car body 10, a jack device 20, and a jack positioning device 50 (see FIG. 2). The jack device 20 has an arm 30 rotatably attached to the car body 10. As shown in FIG. 2, the jack positioning device 50 positions the arm 30 relative to the car body 10. The car body 10 includes an upper car body 13 and a lower car body 15. The lower car body 15 is disposed below the upper car body 13 by a distance Z2. The arm 30 is disposed between the upper car body 13 and the lower car body 15. The arm 30 is rotatably attached to the car body 10 so as to be movable between a first state and a second state (see FIG. 6). One of the first state and the second state is a protruding state in which the arm 30 is protruding relative to the car body 10, as shown in FIG. 6. Of the first and second states, the one that is not the extended state is a stored state in which the jack positioning device 50 is stored in the car body 10, as shown in Fig. 2. As shown in Fig. 2, the jack positioning device 50 includes a link 53, an arm side bracket 61, and a fixing member 71. The link 53 is rotatably attached to the car body 10. The arm side bracket 61 is provided on the arm 30. The fixing member 71 can be attached to the link 53 and the arm side bracket 61.

[0058] [Configuration 1-1] When the arm 30 is in the first state, the fixing member 71 is attached to the link 53 and the arm-side bracket 61 so as to limit the rotation of the arm 30 relative to the car body 10.

[0059] [Configuration 1-2] As shown in FIG. 6, when the arm 30 is in the second state, the link 53 is configured to be able to contact the side plate (arm side plate 31) of the arm 30 so as to limit the rotation of the arm 30 relative to the car body 10.

[0060] In the above [Configuration 1-1], as shown in FIG. 2, when the arm 30 is in the first state, the fixing member 71 is attached to the link 53 and the arm side bracket 61, thereby restricting the rotation of the arm 30 relative to the car body 10. In the above [Configuration 1-2], as shown in FIG. 6, when the arm 30 is in the second state, the link 53 comes into contact with the arm side plate 31, thereby restricting the rotation of the arm 30 relative to the car body 10. Thus, the link 53 is used both to restrict the rotation of the arm 30 when the arm 30 is in the first state shown in FIG. 2 and to restrict the rotation of the arm 30 when the arm 30 is in the second state shown in FIG. 6. Thus, in the lower traveling body 1, the following effects can be obtained compared to a case in which a link member that restricts the rotation of the arm 30 when the arm 30 is in the first state and a link member that restricts the rotation of the arm 30 when the arm 30 is in the second state are provided separately. In the lower running body 1, the device (jack positioning device 50) for limiting the rotation of the arm 30 relative to the carbody 10 can be configured simply, and the number of parts of this device (jack positioning device 50) can be reduced.

[0061] In the above [Configuration 1-2], when the arm 30 is in the second state, the link 53 comes into contact with the arm side plate 31, thereby restricting the rotation of the arm 30 relative to the car body 10. Therefore, the arm side plate 31 (part of the arm 30) is used as a member for restricting the rotation of the arm 30 when the arm 30 is in the second state. Therefore, in the lower running body 1, the following effects can be obtained compared to a case in which a member for restricting the rotation of the arm 30 in the second state is provided separately from the arm 30. In the lower running body 1, the device for restricting the rotation of the arm 30 relative to the car body 10 (jack positioning device 50) can be simply configured, and the number of parts of this device (jack positioning device 50) can be reduced.

[0062] (Effects of the second invention) [Configuration 2] As shown in Fig. 9, one of the arm side plate 31 and the link 53 (e.g., the link 53) has a clamping portion 53e1. The other of the arm side plate 31 and the link 53 (e.g., the arm side plate 31) other than the one having the clamping portion 53e1 has a clamped portion 63a. The clamping portion 53e1 is configured to be able to be positioned to clamp the clamped portion 63a so as to limit the rotation of the arm 30 with respect to the car body 10 when the arm 30 shown in Fig. 6 is in the second state.

[0063] With the above [Configuration 2], when the clamping portion 53e1 is positioned to clamp the clamped portion 63a as shown in Figure 9, it is possible to limit rotation of both sides of the arm 30 (e.g., clockwise and counterclockwise when viewed from the upper side Z1) relative to the car body 10 shown in Figure 6.

[0064] As a structure for restricting the rotation of a member, there is a structure having a hole provided in the member and a pin inserted into the hole. However, when a hole is provided in a member, the strength of the member is likely to decrease. Therefore, it may not be preferable to provide a hole in the member. On the other hand, in the above [Configuration 2], the clamping portion 53e1 and the clamped portion 63a restrict the rotation of the arm 30 relative to the car body 10. Therefore, it is not necessary to provide a hole in the arm side plate 31 of the arm 30, which is a strength member, for restricting the rotation of the arm 30 relative to the car body 10. Therefore, it is possible to suppress the decrease in the strength of the arm 30.

[0065] (Effects of the third invention) [Configuration 3] When the arm 30 is in the second state, the link 53 is attached to be rotatable relative to the car body 10 between a limited position and an unrestricted position. The limited position is a position that limits the rotation of the arm 30 relative to the car body 10. The unrestricted position is a position that releases the restriction on the rotation of the arm 30 relative to the car body 10.

[0066] According to the above [Configuration 3], by rotating the link 53 relative to the car body 10, it is possible to easily switch between restricting the rotation of the arm 30 relative to the car body 10 and releasing the restriction.

[0067] (Effect of the fourth invention) 7, the lower traveling body 1 includes a link rotation shaft portion 55 that rotatably connects the link 53 to the car body 10. The link rotation shaft portion 55 includes a link rotation shaft portion main body portion 55a and a fixing member storage portion 55c. The link rotation shaft portion main body portion 55a is a portion that connects the car body 10 and the link 53.

[0068] [Configuration 4] The fixing member storage portion 55c is provided on the link rotation shaft main body portion 55a and is configured to be able to store the fixing member 71 therein.

[0069] The above [Configuration 4] provides the following effects. The fixing member 71 is used when the arm 30 is in the first state (see FIG. 3 and the above [Configuration 1-1]), and does not need to be used when the arm 30 is in the second state (see the above [Configuration 1-2]). In the above [Configuration 4], the fixing member 71 can be stored in the fixing member storage section 55c. Therefore, for example, loss of the fixing member 71 can be prevented.

[0070] The above [Configuration 4] may provide the following effect. In the above [Configuration 4], the fixing member storage portion 55c is provided separately from the link rotating shaft portion main body portion 55a. Therefore, when the link rotating shaft portion main body portion 55a is attached to or detached from the car body 10 and the link 53, the worker can easily attach or detach the link rotating shaft portion main body portion 55a by holding the fixing member storage portion 55c (using the fixing member storage portion 55c as a handle, for example). Note that the link rotating shaft portion main body portion 55a does not have to be attached or detached to or from the car body 10 and the link 53.

[0071] (Modification) The above embodiment may be modified in various ways. The arrangement and shape of each component of the above embodiment may be changed. For example, the number of components may be changed, or some of the components may not be provided. For example, the components may be fixed or connected directly or indirectly. For example, what has been described as multiple different members or parts may be treated as one member or part. For example, what has been described as one member or part may be provided as multiple different members or parts.

[0072] For example, the extended state of the arm 30 (see FIG. 6) may be the first state of the arm 30 (see FIG. 2). More specifically, when the arm 30 is in the extended state (see FIG. 6), the rotation of the arm 30 may be restricted by a fixing member 71 or the like as shown in FIG. 2. Also, the stored state of the arm 30 (see FIG. 2) may be the second state of the arm 30 (see FIG. 6). More specifically, when the arm 30 is in the stored state (see FIG. 2), the rotation of the arm 30 may be restricted by contact between the link side contact portion 53e and the arm side contact portion 63 as shown in FIG. 6. In this case, the direction of the rotation axis of the link 53 relative to the car body 10 is, for example, the car body front-rear direction X. [Explanation of symbols]

[0073] 1 Undercarriage 10 Car Body 13 Car body upper part 15 Car body lower part 20 Jacking device 30 Arm 31 arm side plate (side plate of arm 30) 50 Jack positioning device 53 Links 53e1 Clamp part 55 Link rotation shaft 55a Link rotating shaft body 55c Fixing member storage section 61 Arm side bracket 63a Clamped part 71 Fixing member

Claims

1. Car body and a jack device having an arm rotatably attached to the car body; a jack positioning device for positioning the arm relative to the car body; Equipped with The car body is The upper part of the car body, a car body lower portion disposed below the car body upper portion; Equipped with The arm is disposed between the upper part of the car body and the lower part of the car body, and is rotatably attached to the car body so as to be movable between a first state and a second state; One of the first state and the second state is a protruding state protruding from the car body, The one of the first state and the second state that is not the extended state is a stored state in which the vehicle is stored with respect to the car body, The jack positioning device is a link rotatably attached to the carbody; an arm side bracket provided on the arm; a fixing member attachable to the link and the arm-side bracket; Equipped with When the arm is in the first state, the fixing member is attached to the link and the arm-side bracket so as to limit rotation of the arm relative to the carbody; When the arm is in the second state, the link is configured to be able to contact a side plate of the arm to limit rotation of the arm relative to the carbody. Lower running body.

2. The undercarriage according to claim 1, One of the side plate and the link of the arm includes a clamping portion, The side plate and the link of the arm, which is different from the side plate and the link having the clamping portion, include a clamped portion, The clamping portion is configured to be positionable to clamp the clamped portion so as to limit rotation of the arm relative to the car body when the arm is in a second state. Lower running body.

3. The lower traveling body according to claim 1 or 2, The link is attached to the car body so as to be rotatable between a limiting position and an unlocked position when the arm is in the second state, the limiting position is a position that limits rotation of the arm relative to the carbody; The restriction release position is a position where the restriction on the rotation of the arm relative to the car body is released. Lower running body.

4. A lower traveling body according to any one of claims 1 to 3, a link rotation shaft portion that rotatably connects the link to the car body, The link rotation shaft portion is a link rotation shaft main body that connects the car body and the link; a fixing member storage section provided on the link rotation shaft main body section and configured to be able to store the fixing member; Equipped with Lower running body.

Images