Disaster prevention vehicles

Abstract

To provide a disaster prevention vehicle which includes a tilt mechanism that can deal with increase in the weight and size of a cab after modification when modified portions of the existing cab increase.SOLUTION: A disaster prevention vehicle includes a tilt mechanism 5 which is connected to a chassis frame 2 and a cab 3 to rotate the cab 3. The tilt mechanism 5 comprises: a cylinder bracket 51 which is attached to the chassis frame 2 so as to protrude to the outer side in the left-right direction from the chassis frame 2; and a tilt cylinder 52 which extends in the vertical direction and is attached to the cylinder bracket 51 in a manner of freely rotatable longitudinally at a rotation shaft 52c. The tilt cylinder 52 comprises: a cylinder tube 52a in which a rotation shaft 52c is provided in a medial portion in the vertical direction; and a cylinder rod 52b which can freely expand / contract with respect to the cylinder tube 52a and whose tip is attached to the rear end of the cab 3. The lower end of the cylinder tube 52a is located on the lower side with respect to the chassis frame 2.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a disaster prevention vehicle equipped with equipment necessary for rescue and firefighting activities, and in particular to a disaster prevention vehicle equipped with a tilt mechanism for rotating a cab having a driver's seat and a rear seat. [Background technology]

[0002] Conventionally, disaster prevention vehicles equipped with equipment necessary for rescue and firefighting activities have been used in the event of a natural disaster such as a fire, accident, or earthquake (see, for example, Patent Document 1). The disaster prevention vehicle of Patent Document 1 has a cab with a driver's seat and a rear seat provided at the front of the vehicle, and a hangar for storing various equipment provided behind the cab.

[0003] Disaster prevention vehicles such as those described in Patent Document 1 are completed by a vehicle body manufacturer that receives a cab-equipped chassis from a truck chassis manufacturer. The vehicle body manufacturer modifies the existing cab manufactured by the truck chassis manufacturer, particularly the rear seat and its surrounding area, to make it easier for disaster prevention personnel to operate. The vehicle body manufacturer also installs a hangar and crane to store various equipment.

[0004] Meanwhile, cab-equipped chassis manufactured by truck chassis manufacturers are provided with a tilt mechanism that rotates the entire cab for inspection or repair of the engine and its surrounding areas (see, for example, Patent Document 2). In Patent Document 2, a tilt hinge is provided at the front end of the chassis frame, and the cab is capable of rotating around the tilt hinge as a pivot. In addition, a cab main member (cab main frame) is provided below the cab, and a tilt cylinder for rotating the cab is provided between this cab main member and the chassis frame. The upper part of the tilt cylinder is attached to the front part of the cab main member, and the lower part of the tilt cylinder is attached to the chassis frame. When the cab is rotated upward, the tilt cylinder pushes the front part of the cab main member upward. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-111095 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-18707 Summary of the Invention [Problem to be solved by the invention]

[0006] In conventional disaster prevention vehicles such as those described in Patent Document 1, a double cab with a driver's seat and a rear seat was typically used as the cab-equipped chassis provided by a truck chassis manufacturer. Conventional cab-equipped chassis equipped with such a double cab typically had a tilt mechanism, as described in Patent Document 2. Body manufacturers have modified these existing cabs, such as by adding a high roof or providing utility space around the rear seat. In recent years, to improve the convenience of team members, the number of modifications to the cab has increased, resulting in the weight and size of the modified cab becoming larger than the existing cab.

[0007] However, in conventional tilt mechanisms such as those described in Patent Document 2, the tilt cylinder was designed to push the front of the cab main member upward. Therefore, simply increasing the tilt cylinder's thrust in response to an increase in the cab's weight due to modifications to the cab resulted in a localized increase in force being applied to the front of the cab main member. Furthermore, if the cab was modified too much and its weight became too large, there was a risk that the front of the cab main member would bend when attempting to rotate the cab upward. For this reason, in the past, there was a limit to the amount of modification that could be made to the cab in order to prevent the cab main member from bending due to the operation of the tilt mechanism.

[0008] The present invention has been made in consideration of these points, and its purpose is to provide a disaster prevention vehicle equipped with a tilt mechanism that can accommodate many modifications to the existing cab, even if the weight and size of the modified cab are large. [Means for solving the problem]

[0009] The present invention provides means for solving the above-mentioned problems as follows: That is, a first invention is a disaster prevention vehicle including a chassis frame extending in the fore-and-aft direction of the vehicle, a cab having a cab main frame connected to the front end of the chassis frame by a tilt hinge and rotatable about the tilt hinge, and a tilt mechanism connected to the chassis frame and the cab to rotate the cab, wherein the tilt mechanism includes a cylinder bracket attached to the chassis frame so as to protrude outward in the left-right direction from the chassis frame, and a tilt cylinder extending in the vertical direction and attached to the cylinder bracket by a rotation shaft so as to be rotatable back and forth, the tilt cylinder including a cylinder tube with the rotation shaft located at the middle in the vertical direction, and a cylinder rod that is extendable relative to the cylinder tube and has a tip attached to the rear end of the cab, the lower end of the cylinder tube being configured to be located below the chassis frame.

[0010] According to the first aspect of the present invention, the tilt cylinder's rotation shaft is attached to the chassis frame via a cylinder bracket, and the tilt cylinder's cylinder rod is attached to the rear end of the cab. This prevents the tilt cylinder from applying a large localized force to the cab main frame when the cab is rotated upward. In other words, when generating the torque required to rotate the cab upward, pushing up the rear end of the cab reduces the force applied by the upper end of the tilt cylinder to the cab main frame compared to pushing up the front end of the cab. This prevents a large localized force from being applied to the cab main frame, compared to a conventional tilt mechanism in which the upper end of the tilt cylinder is attached to the front of the cab main frame. This prevents bending of the cab main frame.

[0011] In addition, in the tilt mechanism of the disaster prevention vehicle of the first invention, the tilt cylinder has a rotation shaft located at the vertical middle of the cylinder tube, and the lower end of the cylinder tube is located below the chassis frame. This allows the tilt cylinder stroke to be increased while minimizing the height of the tilt cylinder above the chassis frame. This prevents the reduction in the cab interior space above the chassis frame due to the tilt cylinder installation space. Even if the length from the tilt hinge to the rear end of the cab is increased due to cab modifications, the tilt cylinder stroke can be ensured to be sufficient to rotate the cab upward to a predetermined angle. Furthermore, because the cylinder bracket is attached to the chassis frame so as to protrude outward in the lateral direction from the chassis frame, the tilt cylinder can be positioned near the lateral ends of the cab, preventing the tilt cylinder installation space from interfering with the cab interior space above the chassis frame. As a result, a disaster prevention vehicle can be equipped with a tilt mechanism that can adequately accommodate modifications to the existing cab, even if the weight and size of the modified cab increase due to the increased number of modifications.

[0012] The second invention is characterized in that, in the first invention, the cylinder rod of the tilt cylinder is attached to the cab via a universal joint portion that allows the cab to rotate freely around the vehicle's longitudinal axis and left-right axis relative to the tip of the cylinder rod.

[0013] According to the second aspect of the present invention, even if the cab is displaced relative to the chassis frame due to factors such as a cab suspension device being provided between the cab and the chassis frame to improve ride comfort, the universal joint can absorb the displacement, thereby preventing excessive twisting of the tilt cylinder and suppressing failure of the tilt mechanism.

[0014] The third invention is characterized in that, in the first or second invention, the cylinder bracket has an insertion frame portion through which the cylinder tube of the tilt cylinder is inserted in the vertical direction, and a cylinder support portion extending upward from the insertion frame portion, and the cylinder support portion has an upwardly opening concave groove portion that supports the rotation axis of the cylinder tube.

[0015] According to the third aspect of the present invention, the tilt cylinder can be attached to the cylinder bracket simply by inserting the tilt cylinder from above the insertion frame to below the insertion frame and fitting the pivot shaft into the recessed groove of the cylinder support. This facilitates the installation of the tilt cylinder during the manufacture of a disaster prevention vehicle and the removal of the tilt cylinder during maintenance. Furthermore, when the tilt cylinder is attached to the cylinder bracket, the weight of the cab or the tilt cylinder itself prevents the pivot shaft of the tilt cylinder from coming out of the recessed groove, and the insertion frame prevents the tilt cylinder from shifting horizontally, ensuring safety.

[0016] The fourth invention is characterized in that, in any one of the first to third inventions, a recess for accommodating the tilt cylinder is formed on the rear surface of the cab, and the tilt cylinder is configured to be hidden from the outside in the left-right direction of the cab when the cab is in a traveling position.

[0017] According to the fourth aspect of the present invention, the tilt cylinder can be hidden from the outside in the left-right direction of the cab unless the cab is rotated upward for maintenance. This prevents the tilt cylinder from being damaged by an object hitting the tilt cylinder while the disaster prevention vehicle is traveling or by someone other than the maintenance worker touching the tilt cylinder. As a result, failure of the tilt mechanism can be suppressed.

[0018] The fifth invention is characterized in that, in any one of the first to fourth inventions, a pair of front and rear arch-shaped members are provided which connect the pair of left and right chassis frames together and form an equipment arrangement space between the chassis frames and the cab main frame, the arch-shaped members are provided with a frame support part which supports the rear of the cab main frame, and a power unit which supplies hydraulic oil to extend and retract the tilt cylinder is arranged in the equipment arrangement space.

[0019] According to the fifth aspect of the present invention, the power unit can be installed near the tilt cylinder and in a position that provides good balance of vehicle weight in the left-right and up-down directions. Furthermore, since the power unit can be located below the rear of the cab, which is the modified portion of the existing cab, the layout of the power unit and the layout of the space inside the cab can be easily determined. This allows for a disaster prevention vehicle equipped with a tilt mechanism that can adequately accommodate modifications to the existing cab, even if the weight and size of the modified cab increase due to the increased number of modifications. [Effects of the Invention]

[0020] The disaster prevention vehicle according to the present invention, compared to a conventional tilt mechanism in which the upper end of the tilt cylinder is attached to the front of the cab main frame, can prevent large localized forces from being applied to the cab main frame, thereby suppressing bending of the cab main frame. Furthermore, the tilt cylinder's stroke can be increased while suppressing the height of the tilt cylinder above the chassis frame, preventing the reduction in the cab interior space above the chassis frame due to the tilt cylinder's installation space. Even if the length from the tilt hinge to the rear end of the cab is long, the tilt cylinder's stroke can be sufficiently secured. As a result, a disaster prevention vehicle equipped with a tilt mechanism can be provided that can adequately accommodate modifications to an existing cab, even if the weight and size of the modified cab increase due to the increased number of modifications. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a side view of a disaster prevention vehicle according to an embodiment of the present invention. [Figure 2] FIG. 2 is a side view mainly illustrating a modified cab portion of the disaster prevention vehicle of this embodiment. [Figure 3] FIG. 2 is a view taken along the line AA in FIG. [Figure 4] 1A to 1C are diagrams showing a cylinder bracket, in which (a) is a side view, (b) is a rear view, and (c) is a plan view. [Figure 5] 1A and 1B are diagrams showing a tilt cylinder and a universal joint portion attached to the tip thereof, in which FIG. 1A is a side view and FIG. 1B is a rear view. [Figure 6] FIG. 2 is a hydraulic circuit diagram of a tilt mechanism of the disaster prevention vehicle according to the present embodiment. [Figure 7] FIG. 3 is a side view showing a state in which the cab has been rotated upward from the state shown in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, a disaster prevention vehicle according to an embodiment of the present invention will be described with reference to the drawings.

[0023] FIG. 1 shows a disaster prevention vehicle 1 according to one embodiment of the present invention. The disaster prevention vehicle 1 of this embodiment is used, for example, as a rescue vehicle equipped with various equipment and tools required for rescue operations at fire scenes, accident scenes, etc. The disaster prevention vehicle 1 has a cab 3 at the front of the vehicle, which has a driver's seat and a rear seat (not shown), and a hangar 6 for storing various equipment provided behind the cab 3. A crane unit 7 is also provided behind the hangar 6.

[0024] The disaster prevention vehicle 1 is completed by a body manufacturer after receiving a cab-equipped chassis from a truck chassis manufacturer. The body manufacturer installs an additional cab section 33 in the existing cab section 32 manufactured by the truck chassis manufacturer, with modifications made to the rear seat and its surrounding area to make it easier for team members to move around. The body manufacturer also installs a hangar 6 and a crane section 7. A rear entrance 33a is provided on the left side of the additional cab section 33 to allow team members in the rear seats to get in and out.

[0025] FIG. 2 is a side view mainly illustrating the cab modification portion of the disaster prevention vehicle 1 of this embodiment. The disaster prevention vehicle 1 is modified using a double-cab cab chassis. The cab 3 is formed by removing the roof and rear portions of an existing cab section 32 (shown by a two-dot chain line in FIG. 2) manufactured by a chassis manufacturer, and installing an additional cab section 33 (shown by a solid line in FIG. 2) that has a high roof and adds utility space, etc. The thick two-dot chain line indicated by B in FIG. 2 indicates the portion that will be removed from the existing cab section 32. The additional cab section 33 is formed into a three-dimensional shape using multiple cab-forming frame members 33c.

[0026] The disaster prevention vehicle 1 is equipped with a pair of left and right chassis frames 2, 2 extending in the fore-and-aft direction of the vehicle, a cab 3 having a cab main frame 31 connected to the front end of the chassis frame 2 by a tilt hinge 4 and capable of rotating freely around the tilt hinge 4, and a tilt mechanism 5 connected to the chassis frame 2 and the cab 3 to rotate the cab 3.

[0027] 3 is a view taken along the line AA in FIG. 1. In FIGS. 2 and 3, the cab 3 of this embodiment has a pair of left and right cab main frames 31, which are formed as a whole by an extension provided by a body manufacturer to the rear end of an existing portion manufactured by a truck chassis manufacturer. This extension is indicated by hatching in FIG. 2. The cab main frames 31 are provided at the bottom of the cab 3, and the floor member 33d of the additional cab section 33 is fixed to the cab main frames 31 by directly attaching them to the cab main frames 31 or by attaching them to the cab main frames 31 via connecting members 33e. When the disaster prevention vehicle 1 is in a traveling position, the front ends of the pair of left and right cab main frames 31, 31 are supported by the tilt hinge 4, and the rear ends of the pair of left and right cab main frames 31, 31 are supported by the frame support parts 54d, respectively.

[0028] The frame support portion 54d is attached via a support bracket 54c to an arch-shaped member 54 that connects a pair of left and right chassis frames 2, 2. There are a pair of arch-shaped members 54, one front and one rear, of which the front arch-shaped member 54a is attached by the truck chassis manufacturer when manufacturing the cab-equipped chassis, and the rear arch-shaped member 54b is attached by the body manufacturer. The front arch-shaped member 54a and the rear arch-shaped member 54b have the same structure. A subframe 61 is attached to the chassis frame 2 behind the rear arch-shaped member 54b and along the chassis frame 2. A storage shed 6 is provided on top of this subframe 61.

[0029] The cab main frame 31 of the cab 3 has a rectangular cross section near the tilt hinge 4, but the portion supported by the frame support part 54d has an inverted triangular cross section. The frame support part 54d is shaped to support two surfaces of the cab main frame 31 in accordance with the inverted triangular cross section. The contact portion between the cab main frame 31 and the frame support part 54d is preferably made of an elastic material.

[0030] The tilt mechanism 5 of this embodiment is installed by a body manufacturer after removing an existing tilt mechanism. The tilt mechanism 5 has a pair of left and right cylinder brackets 51, 51 attached to the chassis frame 2 so as to protrude outward in the left-right direction from the chassis frame 2, and a tilt cylinder 52 extending in the up-down direction and attached to each cylinder bracket 51 by a rotation shaft 52c so as to be rotatable back and forth.

[0031] The tilt cylinder 52 has a cylinder tube 52a with a rotation shaft 52c provided in the vertical middle, and a cylinder rod 52b that is extendable relative to the cylinder tube 52a and has a tip attached to the rear end of the cab 3 (additional cab portion 33). The lower end of the cylinder tube 52a is located below the chassis frame 2.

[0032] The cylinder bracket 51 is attached to the chassis frame 2 at a longitudinal position between the front arch-shaped member 54a and the rear arch-shaped member 54b. As shown in FIG. 4, the cylinder bracket 51 is formed by assembling and welding one first plate member 51a having an inverted L shape with a horizontal portion and a vertical portion and two second plate members 51b having a substantially triangular shape. Furthermore, the cylinder bracket 51 is formed by attaching a member formed of one insertion frame portion 51d and two cylinder support portions 51e to the horizontal portion of the first plate member 51a. More specifically, a rectangular hole 51g (see FIG. 4(c)) is formed in the horizontal portion of the first plate member 51a, and the insertion frame portion 51d and the cylinder support portions 51e are attached so as to surround the rectangular hole 51g.

[0033] The cylinder tube 52a of the tilt cylinder 52 is adapted to be inserted vertically through the rectangular hole 51g and the insertion frame portion 51d. The cylinder support portion 51e is provided to extend upward from the insertion frame portion 51d and has an upwardly opening recessed groove portion 51f that supports the rotation shaft 52c of the tilt cylinder 52. In addition, the second plate member 51b is formed with a cylinder interference avoidance notch 51c to prevent interference when the tilt cylinder 52 is rotated back and forth around the rotation shaft 52c.

[0034] 2 and 3, a recess 33g that houses the tilt cylinder 52 is formed in the rear surface of the cab 3, and is configured so that the tilt cylinder 52 is hidden from the outside in the left-right direction of the cab 3 when the cab 3 is in a traveling position. A pair of rod tip mounting brackets 33f, 33f are provided on the upper end of the wall surface that forms the recess 33g. The cylinder rod 52b of the tilt cylinder 52 is attached to the rod tip mounting bracket 33f via a universal joint 53.

[0035] 5, the universal joint 53 is formed so that the cab 3 is rotatable relative to the tip of the cylinder rod 52b about the axis of the vehicle longitudinal axis C1 and the axis of the left-right axis C2. Specifically, the universal joint 53 has a base member 53a attached to the tip of the cylinder rod 52b, a retaining ring-equipped male threaded member 53b attached to a female threaded portion provided at the tip of the base member 53a, a fitting curved surface portion-equipped rod member 53c having a fitting curved surface portion provided at its longitudinal intermediate portion that fits into the retaining ring portion of the retaining ring-equipped male threaded member 53b, and a connecting member 53f attached to the end of the fitting curved surface portion-equipped rod member 53c and fixed to the rod tip mounting bracket 33f. The connecting member 53f has two flat plate portions 53d with elongated holes each having a long hole that fits into the end of the fitting curved surface rod member 53c, and a connecting flat plate portion 53e that connects the two flat plate portions 53d with elongated holes.

[0036] 2 and 3, hydraulic oil for extending and retracting the tilt cylinder 52 is supplied to the tilt cylinder 52 by a power unit 55. The power unit 55 is disposed in an equipment arrangement space S formed between the front and rear of the pair of front and rear arch-shaped members 54, 54 and between the top and bottom of the chassis frame 2 and the arch-shaped member 54. Piping and the like that connects the power unit 55 and the tilt cylinder 52 are also disposed in this equipment arrangement space S. In addition, a propeller shaft 71 that extracts power from a vehicle engine (not shown) and transmits the power to an on-board water pump and the like passes through the equipment arrangement space S.

[0037] Fig. 6 shows a hydraulic circuit diagram of the tilt mechanism 5 of the disaster prevention vehicle 1 according to this embodiment. As shown in Fig. 6, the power unit 55 includes a hydraulic pump 55a, an electric motor 55b that drives the hydraulic pump 55a, a hydraulic oil tank 55e that stores hydraulic oil, a check valve 55c that prevents backflow of the hydraulic oil delivered from the hydraulic pump 55a, and a relief valve 55d that returns the hydraulic oil to the hydraulic oil tank 55e when the pressure of the hydraulic oil delivered from the hydraulic pump 55a becomes excessively high. The electric motor 55b is driven by power from a vehicle accessory battery (not shown).

[0038] A flow path L1 connecting the power unit 55 and the pair of tilt cylinders 52 is provided with a flow dividing and collecting valve 56 for evenly distributing hydraulic oil from the hydraulic pump 55a to each tilt cylinder 52. In addition, a flow path L2 branches off from flow path L1 between the flow dividing and collecting valve 56 and the power unit 55. The downstream end of flow path L2 is connected to a hydraulic oil tank 55e. A stop valve 59, a directional control valve 57, and a pressure switch 58 are provided in flow path L2. As shown in FIG. 2, the stop valve 59 and the directional control valve 57 are operated by a tilt mechanism operating unit 33b provided on the left side of the add-on cab section 33.

[0039] As shown in FIGS. 2 and 3 , the tilt mechanism 5 of this embodiment rotates the cab 3 upward or downward by operating the stop valve 59 and the directional control valve 57 in the tilt mechanism operating unit 33b. When the cab 3 is rotated upward from the traveling position shown in FIG. 2 , it assumes the position shown in FIG. 7 . In this position, the rear of the cab main frame 31 provided at the bottom of the cab 3 is released from the frame support portion 54d and raised by the tilt cylinder 52. This exposes not only the vehicle engine and its peripheral devices (not shown), but also the power unit 55, making maintenance work easier. Although the detailed structure is not shown, in this embodiment, a cab lock device 34 is provided on the rear of the cab 3 as shown in FIG. 3 . When the cab 3 is in the traveling position, the cab lock device 34 restricts the upward rotation of the cab 3. When the cab 3 is rotated upward by the tilt mechanism 5 for maintenance, the cab lock device 34 is unlocked before the cab 3 is rotated upward.

[0040] As described above, the disaster prevention vehicle 1 according to this embodiment is provided with the chassis frame 2 extending in the front-rear direction of the vehicle, the cab 3 having the cab main frame 31 connected to the front end of the chassis frame 2 by the tilt hinge 4 and rotatable about the tilt hinge 4, and the tilt mechanism 5 connected to the chassis frame 2 and the cab 3 to rotate the cab 3. The tilt mechanism 5 is provided with the cylinder bracket 51 attached to the chassis frame 2 so as to protrude outward in the left-right direction from the chassis frame 2, and the cylinder bracket 51 extending in the up-down direction and rotatable forward-backward about the rotation shaft 52c attached to the cylinder bracket 51. The tilt cylinder 52 has a cylinder tube 52a with a rotating shaft 52c located in the middle in the vertical direction, and a cylinder rod 52b that is extendable relative to the cylinder tube 52a and has its tip attached to the rear end of the cab 3. The lower end of the cylinder tube 52a is configured to be positioned lower than the chassis frame 2, so that, compared to conventional tilt mechanisms, large forces are not applied locally to the cab main frame 31, and bending of the cab main frame 31 can be suppressed.

[0041] Furthermore, tilt cylinder 52 is configured so that rotation shaft 52c is provided in the vertical middle portion of cylinder tube 52a and the lower end of cylinder tube 52a is positioned lower than chassis frame 2, and therefore the stroke amount of tilt cylinder 52 can be increased while suppressing the height of tilt cylinder 52 above chassis frame 2. This makes it possible to suppress a reduction in the space inside the cab above chassis frame 2 due to the installation space for tilt cylinder 52. Furthermore, even if the length from tilt hinge 4 to the rear end of cab 3 is increased due to cab modification, it is possible to ensure a stroke amount of tilt cylinder 52 sufficient to rotate cab 3 upward to a predetermined angle.

[0042] Furthermore, because cylinder bracket 51 is attached to chassis frame 2 so as to protrude outward in the left-right direction from chassis frame 2, tilt cylinder 52 can be disposed near the left-right ends of cab 3, and it is possible to prevent the installation space for tilt cylinder 52 from interfering with the space inside the cab on chassis frame 2. As a result, disaster prevention vehicle 1 can be provided with tilt mechanism 5 that can adequately accommodate an increase in the weight and size of cab 3 after modification due to an increase in the number of modifications to the existing cab.

[0043] Furthermore, in this embodiment, the cylinder rod 52b of the tilt cylinder 52 is attached to the cab 3 via a universal joint 53 that allows the cab 3 to rotate freely with respect to the tip of the cylinder rod 52b about the axis of the vehicle longitudinal axis C1 and the axis of the left-right axis C2, so even if the cab 3 is displaced relative to the chassis frame 2 due to factors such as a cab suspension device being provided between the cab 3 and the chassis frame 2 to improve ride comfort, the universal joint 53 can absorb the displacement. This prevents excessive twisting from occurring in the tilt cylinder 52, and prevents failure of the tilt mechanism 5.

[0044] Furthermore, in this embodiment, the cylinder bracket 51 has an insertion frame portion 51d through which the cylinder tube 52a of the tilt cylinder 52 is inserted in the vertical direction, and a cylinder support portion 51e extending upward from the insertion frame portion 51d, and the cylinder support portion 51e has an upwardly opening recessed groove portion 51f that supports the rotation shaft 52c of the cylinder tube 52a, so that the tilt cylinder 52 can be attached to the cylinder bracket 51 simply by inserting the tilt cylinder 52 from above the insertion frame portion 51d to below the insertion frame portion 51d and fitting the rotation shaft 52c into the recessed groove portion 51f of the cylinder support portion 51e. This facilitates the attachment of the tilt cylinder 52 during the manufacture of the disaster prevention vehicle 1 and the removal of the tilt cylinder 52 during maintenance. Furthermore, when the tilt cylinder 52 is attached to the cylinder bracket 51, the weight of the cab 3, the weight of the tilt cylinder 52 itself, and the cab lock device 34 prevent the rotating shaft 52c of the tilt cylinder 52 from coming out of the recessed groove portion 51f, and the insertion frame portion 51d prevents the tilt cylinder 52 from shifting horizontally, thereby ensuring safety.

[0045] Furthermore, in this embodiment, a recess 33g that accommodates the tilt cylinder 52 is formed on the rear surface of the cab 3, and is configured so that the tilt cylinder 52 is hidden from the outside in the left-right direction of the cab 3 when the cab 3 is in a traveling position. Therefore, unless the cab 3 is rotated upward for maintenance, the tilt cylinder 52 can be hidden from the outside in the left-right direction of the cab 3. This prevents the tilt cylinder 52 from being damaged by an object hitting the tilt cylinder 52 while the disaster prevention vehicle 1 is traveling, or by someone other than the worker performing maintenance touching the tilt cylinder 52. As a result, failure of the tilt mechanism 5 can be suppressed.

[0046] Furthermore, in this embodiment, a pair of front and rear arch-shaped members 54, 54 are provided that connect the pair of left and right chassis frames 2, 2 and form an equipment arrangement space S between the chassis frame 2 and the cab main frame 31. The arch-shaped members 54 are provided with a frame support portion 54d that supports the rear of the cab main frame 31. A power unit 55 that supplies hydraulic oil for extending and retracting the tilt cylinder 52 is disposed in the equipment arrangement space S. This allows the power unit 55 to be located near the tilt cylinder 52 and in a position that provides good vehicle weight balance in the left-right and up-down directions. Furthermore, since the power unit 55 can be located below the rear of the cab 3, which is a modified portion of the existing cab, the layout of the power unit 55 and the layout of the interior space of the cab can be easily determined. This allows the disaster prevention vehicle 1 to be equipped with a tilt mechanism 5 that can adequately accommodate modifications to the existing cab, even if the weight and size of the modified cab 3 increase due to the increased number of modifications.

[0047] The embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. The technical scope of the present invention is not to be interpreted solely by the above-described embodiments, but is defined by the claims. The technical scope of the present invention also includes all modifications within the scope and meaning equivalent to the claims. [Explanation of symbols]

[0048] 1. Disaster prevention vehicles 2 Chassis frame 3 Cab 4 Tilt Hinge 5 Tilt mechanism 31 Cab main frame 33 Additional cab section 33g recess 51 Cylinder bracket 52 Tilt cylinder 52a Cylinder tube 52b Cylinder rod 52c Rotating shaft 53 Universal joint part 54 Arched Member 54d Frame support 55 Power Unit C1 Anteroposterior axis C2 Left-right axis S Equipment placement space

Claims

1. A disaster prevention vehicle including: a chassis frame extending in the fore-and-aft direction of the vehicle; a cab having a cab main frame connected to a front end of the chassis frame by a tilt hinge and rotatable around the tilt hinge; and a tilt mechanism connected to the chassis frame and the cab to rotate the cab, the tilt mechanism includes a cylinder bracket attached to the chassis frame so as to protrude outward in the left-right direction from the chassis frame, and a tilt cylinder extending in the up-down direction and attached to the cylinder bracket by a rotation shaft so as to be rotatable back and forth, The tilt cylinder includes a cylinder tube in which the rotation shaft is provided at a vertically intermediate portion, and a cylinder rod that is extendable relative to the cylinder tube and has a tip attached to a rear end portion of the cab, The lower end of the cylinder tube is configured to be located below the chassis frame, a recess for accommodating the tilt cylinder is formed on the rear surface of the cab and behind a floor member of the cab, and the tilt cylinder is configured to be hidden from the outside in the left-right direction of the cab when the cab is in a traveling posture; A disaster prevention vehicle characterized by:

2. The cylinder rod of the tilt cylinder is attached to the cab via a universal joint portion that allows the cab to rotate freely about the longitudinal axis and the lateral axis of the vehicle relative to the tip of the cylinder rod.

2. The disaster prevention vehicle according to claim 1.

3. the cylinder bracket has an insertion frame portion through which the cylinder tube of the tilt cylinder is inserted in the vertical direction, and a cylinder support portion extending upward from the insertion frame portion, The cylinder support portion has an upwardly opening recessed groove portion that supports the rotation shaft of the cylinder tube.

3. The disaster prevention vehicle according to claim 1 or 2.

4. a pair of front and rear arch-shaped members that connect the pair of left and right chassis frames together and form an equipment arrangement space between the chassis frames and the cab main frame; The arch-shaped member is provided with a frame support portion that supports a rear portion of the cab main frame, A power unit that supplies hydraulic oil for extending and retracting the tilt cylinder is disposed in the equipment arrangement space.

4. The disaster prevention vehicle according to claim 1, wherein:

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