JP6788498B2 - Concrete pump car - Google Patents

Description

The present invention relates to a concrete pump truck used for pumping concrete to its casting position.

This type of concrete pump truck is proposed in Patent Document 1 below. The concrete pump truck described in Patent Document 1 includes a concrete pump for pumping ready-mixed concrete (hereinafter referred to as "ready-mixed concrete") toward a casting site and a hydraulic pump for supplying hydraulic oil to the concrete pump. And a power switching device (also referred to as "PTO") for extracting the driving force of the hydraulic pump from the propeller shaft (also referred to as "drive shaft").

The concrete pump, hydraulic pump and power switching device are mounted on the chassis. The chassis includes a chassis frame and a subframe arranged on the upper side of the chassis frame. The subframes are provided in pairs on both sides in the vehicle width direction, and are integrated by being connected by cross members passed in the vehicle width direction. The hydraulic pump is mounted on the subframe behind the power switching device connected to the middle portion of the propeller shaft and is supported by the subframe.

Jikken 02-44577

In the concrete pump vehicle described in Patent Document 1, the hydraulic pump is located at a position where the center of gravity of the concrete pump vehicle is high because it is mounted on the subframe arranged on the upper side of the chassis frame. Therefore, it is pointed out that the concrete pump truck is unstable. Therefore, in order to stabilize the concrete pump truck, it is conceivable to arrange the hydraulic pump below the subframe.

However, the subframe is connected by a cross member to ensure rigidity. Therefore, if the hydraulic pump is arranged below the subframe, the cross member is not provided. In that case, the rigidity of the entire frame is reduced.

Therefore, an object of the present invention is to provide a concrete pump vehicle capable of ensuring stability while ensuring the rigidity of the entire frame.

The concrete pump truck of the present invention includes a chassis frame arranged in parallel at a predetermined interval in the vehicle width direction and a subframe mounted and fixed on the chassis frame at a predetermined interval in the vehicle width direction. A boom device for connecting a plurality of beams to supply concrete to the casting position, a concrete pump for pumping concrete toward the casting position, and hydraulic oil to be supplied to the concrete pump. A hydraulic pump for this purpose and a power switching device configured to extract the driving force of the hydraulic pump from the drive mechanism of the vehicle are further provided, and the hydraulic pump and the power switching device are assembled into a power switching assembly. The power switching assembly is arranged below the upper end of the subframe, and is arranged above the power switching assembly along the vehicle width direction to connect the subframes in the vehicle width direction. It is characterized by including at least one of a directional connecting member and a vertical connecting member that connects the chassis frame and the subframe in the vehicle height direction at a position near the side of the power switching assembly.

According to the concrete pump vehicle of the present invention having the above configuration, the power switching assembly of the hydraulic pump and the power switching device is arranged below the subframe, so that the center of gravity of the concrete pump vehicle is lowered by that amount. At least one of a horizontal connecting member that stabilizes the concrete pump truck and connects the subframes in the vehicle width direction and a vertical connecting member that connects the chassis frame and the subframe in the vehicle height direction. The rigidity of the entire frame can be ensured by providing the above.

In the concrete pump vehicle of the present invention, it is possible to adopt a configuration in which the chassis frames are connected to each other in the vehicle width direction at the front and rear positions of the power switching assembly, and a lateral connecting member different from the lateral connecting member is provided.

By providing a lateral connecting member that connects the chassis frames in the vehicle width direction as in the above configuration, the rigidity of the entire frame is ensured even if the power switching assembly is equipped with a hydraulic pump and a power switching device. it can.

In the concrete pump vehicle of the present invention, stability can be ensured while ensuring the rigidity of the entire frame.

It is a side view which shows the schematic structure of the piston type concrete pump of this invention. It is a side view which shows the positional relationship between the same power switching assembly and a vertical connecting member. It is a rear view showing the positional relationship between the same power switching assembly and the vehicle body frame in the vertical direction and the horizontal direction. It is a top view which shows the schematic structure of the concrete pump. It is a top view which shows the pump drive cylinder and the power switching assembly to which the hose is connected. It is the same side view. It is a side view which shows the positional relationship in the vertical direction of the subframe and the power switching assembly provided with the same lateral connecting member. It is the same plan view.

Hereinafter, the concrete pump truck according to the embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the concrete pump vehicle includes a vehicle body frame behind the driver's seat, and the vehicle body frame includes a chassis frame F1 and a subframe F2.

The chassis frame F1 is a long member extending in the front-rear direction of the vehicle, and is arranged in parallel in pairs at predetermined intervals in the vehicle width direction to form a vehicle body. The subframe F2 is fixed to the upper surface of the pair of chassis frames F1 and is formed in a long shape along the front-rear direction of the vehicle. That is, the subframes F2 are arranged in parallel at predetermined intervals in the vehicle width direction, similarly to the chassis frame F1.

As shown in FIG. 3, the chassis frame F1 and the subframe F2 are both made of a steel material having a U-shaped cross section. Specifically, the lower flange 92 of the subframe F2 is fixed to the upper flange 90 of the chassis frame F1 via the shim plate 91, and the outer surfaces of the chassis frame F1 and the subframe F2 in the vehicle width direction are arranged flush with each other. Has been done.

The subframe F2 is formed to have a shorter length in the front-rear direction than the chassis frame F1, and the front end surface of the subframe F2 is located rearward with respect to the front end surface of the chassis frame F1. As shown in FIGS. 1 and 2, the subframe F2 is provided with a low position support portion 93 set lower than that of the rear portion in the front portion thereof. The low position support portion 93 is integrally formed with the high position support portion 94 on the rear side via a stepped surface portion 95 along the vertical direction, which is the vehicle height direction.

As shown in FIG. 1, the concrete pump truck includes a boom device B for supplying ready-mixed concrete to the placing position. The boom device B is arranged at the front portion of the subframe F2. Explaining the schematic configuration of the boom device B, the boom device B includes a gantry 96 fixed to a low position support portion 93 at the front of the subframe F2, a swivel support pedestal 97 installed on the gantry 96, and a swivel support. The base 97 includes a support column 98 that is rotatably supported around the vertical axis, and a boom 100 provided at the upper end of the support column 98.

The gantry 96 is fixed so as to pass to the low position support portion 93 of the pair of subframes F2. The boom 100 is a plurality of (for example, four) beams flexibly connected to each other, and are arranged in order from the support column 98 side, the first beam 101, the second beam 102, the third beam 103, and the first beam. It is composed of a combination of four beams 104. A boom pipe 105 that guides ready-mixed concrete pumped from a concrete pump 1 described later to the tip of the fourth beam 104 to the first beam 101 to the fourth beam 104 is fixed along the support column 98 and the boom 100. ..

The concrete pump truck includes a concrete pump 1 for pumping ready-mixed concrete, hydraulic pump units 49 and 50 for supplying hydraulic oil to the concrete pump 1 (pump drive cylinders 23 and 24, which will be described later), and hydraulic pump units 49, It includes a power switching device T, also called a transfer pump, which is configured to take out the driving force of 50 from the propeller shaft D, which is a driving mechanism of the vehicle. The concrete pump 1 is supported by the rear part of the chassis frame F1.

As shown in FIG. 4, the concrete pump 1 includes a concrete pump main body 2, a valve device 3 arranged behind the concrete pump main body 2, a block 44 for relaying hydraulic oil shown in FIGS. 5 and 6, and a block. The 44 is provided with a plurality of hoses for hydraulic oil to which one end side is connected.

As shown in FIG. 4, the concrete pump main body 2 includes a left pump cylinder 21 and a right pump cylinder 22 which are separated and arranged in parallel in the vehicle width direction. At the base end (front end) of the left pump cylinder 21, the left pump drive cylinder 23 for driving the left pump cylinder 21 is located, and at the base end of the right pump cylinder 22 is the right side for driving the right pump cylinder 22. The pump drive cylinder 24 of the above is integrally connected in the axial direction via the center frame 25. The pump cylinders 21 and 22 are arranged close to each other so as to have a slight gap in the left-right direction with the axes parallel to each other. The pump drive cylinders 23 and 24 are arranged close to each other so as to have a slight gap in the left-right direction with the axes parallel to each other.

Pump pistons 21a and 22a are slidably installed in the pump cylinders 21 and 22, and drive pistons 23a and 24a are slidably installed in the pump drive cylinders 23 and 24. The pump piston 21a in the left pump cylinder 21 and the drive piston 23a in the left pump drive cylinder 23 are integrally connected by a left piston rod 26 that slidably penetrates the center frame 25. The pump piston 22a in the pump cylinder 22 on the right side and the drive piston 24a in the pump drive cylinder 24 on the right side are integrally connected by a piston rod 27 on the right side that slidably penetrates the center frame 25.

The inside of the pump drive cylinders 23 and 24 is divided into the second hydraulic oil chambers 23b and 24b on the piston rods 26 and 27 side and the first hydraulic oil chambers 23c and 24c on the drive pistons 23a and 24a side by the drive pistons 23a and 24a. Has been done. The tips (rear ends) of the pump cylinders 21 and 22 are opened as hydraulic oil discharge ends 21b and 22b. The discharge ends 21b and 22b of the pump cylinders 21 and 22 are communicated with each other on the front surface of the valve device 3.

The valve device 3 includes a valve casing 31, a bottom lid 32, an S valve 33 (swing valve pipe), an S valve driving means 34, and a discharge pipe 35. The valve casing 31 is formed in a frame shape by the front wall 31a, the rear wall 31b, and the left and right side walls 31c and 31c. The lower part of the valve casing 31 is opened to form an opening 31d. The opening 31d is closed by the bottom lid 32, and the opening 31d can be opened and closed by moving the bottom lid 32 with a cylinder (not shown).

A hopper H that receives ready-mixed concrete is connected to the upper part of the valve casing 31. The curved tubular S-valve 33 is housed in the lower portion of the valve casing 31. The S valve 33 is parallel to the axes of the pump cylinders 21 and 22, and is rotatably configured around the axis of the rotation support shaft 33a provided integrally with the S valve 33. With this configuration, the S valve 33 is configured to be switchable so that the discharge ends 21b and 22b of the pair of pump cylinders 21 and 22 are alternately communicated with the suction port 33b of the S valve 33.

The S valve driving means 34 is connected to the rotary support shaft 33a. The S-valve driving means 34 rotates the rotating support shaft 33a in synchronization with the operation of both pump pistons 21a and 22a to switch and drive the S-valve 33. The S-valve drive means 34 includes a left-side single-acting valve drive cylinder 34a and a right-side single-acting valve drive cylinder 34b that cooperate with each other. The tip ends of the valve drive cylinder 34a and the valve drive cylinder 34b are connected to each other via a connecting arm 34c integrally extending from the rotary support shaft 33a, and the base ends of both valve drive cylinders 34a and 34b are concrete pumps. It is rotatably connected to the main body 2.

When the concrete pump is in operation, the pair of valve drive cylinders 34a and 34b puts the pair of left and right pump cylinders 21 and 22 in the ready-mixed concrete suction state into the valve casing 31 and in the ready-mixed concrete pumping state. The ready-mixed concrete is smoothly pumped by controlling the switching drive of the S valve 33 so that a certain object is alternately connected to the suction port 33b of the S valve 33. That is, the S valve 33 has a first switching position for connecting the suction port 33b to the discharge end 21b of the left pump cylinder 21 and a second switching position for connecting the suction port 33b to the discharge end 22b of the right pump cylinder 22. It is possible to reciprocate (rotate) between the two, and to the first switching position by the extension operation of the valve drive cylinder 34a on the left side, and to the second switching position by the extension operation of the valve drive cylinder 34b on the right side. It is switched and held.

The front end of the discharge pipe 35 is connected to the rear wall 31b of the valve casing 31 and always communicates with the S valve 33, and the rear end thereof is connected to the boom pipe 105. The boom pipe 105 extends from the discharge pipe 35 toward the side of the vehicle body, is further extended forward, is inserted into the swivel support base 97, and is extended along the support column 98 and the boom 100. There is.

As shown in FIGS. 5 and 6, eight hoses 36 are provided in eight ports 231a, 231b, 241a, 241b, 232a, 232b, 242a, 242b provided in the pump drive cylinders 23 and 24 of the concrete pump 1. , 37, 38, 39, 45, 46, 47, 48 are connected respectively, and the other ends of the eight hoses 36, 37, 38, 39, 45, 46, 47, 48 are connected to the relay block 44. It is connected. One end of four hoses 40, 41, 42, 43 for supplying or discharging hydraulic oil to the block 44 is connected to the block 44, and the other end of the four hoses 40, 41, 42, 43 is two. It is connected to two hydraulic pump units 49 and 50.

The block 44 is formed in a substantially rectangular parallelepiped shape, and as shown in FIG. 5, 12 ports 51 to 62 for connecting the 12 hoses 36 to 43, 45 to 48 are formed. Two hoses having one end connected to each of the first ports 231b and 241a inside the front ends of the left and right pump drive cylinders 23 and 24 are connected to the two ports 51 and 52 provided at the front ends of the block 44. The other ends of 36 and 37 are connected, respectively.

Of the four ports 53, 54, 55, 56 provided on the left side of the block 44, the front port 53, and the four ports 57, 58, 59, 60 provided on the right side of the block 44. The other ends of the two hoses 38 and 39, one ends of which are connected to the outer first ports 231a and 241b of the front ends of the left and right pump drive cylinders 23 and 24, are connected to the front port 57, respectively. Of the four ports 53, 54, 55, 56 provided on the left side surface of the block 44, the second and third ports 54, 55 from the front side, and the four ports 57, 58 provided on the right side surface of the block 44. , 59, 60, the second and third ports 58, 59 from the front side, the other ends of the four hoses 40, 41, 42, 43 connected to the two hydraulic pump units 49, 50, respectively. Be connected.

The rear port 56 of the four ports 53, 54, 55, 56 provided on the left side of the block 44, and the rear of the four ports 57, 58, 59, 60 formed on the right side of the block 44. The other ends of the two hoses 45 and 46, one ends of which are connected to the outer second ports 232a and 242b of the rear ends of the left and right pump drive cylinders 23 and 24, are connected to the side ports 60, respectively. .. Two hoses 47, one ends of which are connected to the two ports 61 and 62 provided on the rear surface of the block 44 to the second ports 232b and 242a inside the rear ends of the left and right pump drive cylinders 23 and 24, respectively. The other ends of the 48 are connected respectively.

In the concrete pump vehicle having the above configuration, when the output of the engine is switched to be the driving force of the concrete pump 1 by the power switching device T, the hydraulic oil is changed from the oil tank (not shown) to the hydraulic pump units 49, 50, the hose 40, A pair of pump drive cylinders 23, 24 via 41, 42, 43, block 44, hoses 36, 37, 38, 39, or returned to the oil tank via hydraulic pump units 49, 50. By driving the pump drive cylinders 23 and 24, ready-mixed concrete is alternately discharged from the discharge end 21b of the pump cylinder 21 and the discharge end 22b of the pump cylinder 22, and the ready-mixed concrete is supplied to the boom pipe 105 at a required lift. ..

Returning to FIG. 1, the power switching device T is connected in the middle of the propeller shaft D in order to take out the driving force of the propeller shaft D that is rotated by the output of the engine. The power switching device T is configured to be switchable between the case where the output of the engine is used as the traveling force of the vehicle and the case where the output of the engine is used as the driving force of the concrete pump 1 by switching the connection of a plurality of built-in gears. The power switching device T and the hydraulic pump units 49 and 50 are assembled to form a power switching assembly TA.

The power switching device T is directly connected to an intermediate portion of the propeller shaft D, and the hydraulic pump units 49 and 50 are connected to the upper part and the rear of the power switching device T. Further, as shown in FIG. 6, the power switching device T and the hydraulic pump units 49 and 50 are connected via a gear 49a whose axis is aligned in the front-rear direction.

In the present embodiment, the hydraulic pump units 49 and 50 are reversible pumps, which are assembled with each other and arranged side by side in the front-rear direction. Further, as shown in FIG. 7, two other pump units 106 that supply hydraulic oil to the hydraulic drive unit other than the concrete pump 1 are connected to the rear of the hydraulic pump unit 50 arranged rearward. .. The pump unit 106 is used, for example, to drive the S-valve driving means 34.

The power switching assembly TA is arranged below the upper end of the subframe F2 (the upper end surface of the upper flange portion F2a in the subframe F2). In other words, the power switching assembly TA is arranged so as not to project upward with respect to the upper end of the subframe F2. As shown in FIG. 3, the left and right width W1 in the vehicle width direction of the power switching assembly TA is set to a dimension that fits between the vehicle body frame (inner end of the flange portion in the chassis frame F1 and subframe F2 in the vehicle width direction) W2. Has been done.

Of the power switching assembly TA, the axial center position of the power take-out shaft 107 connected to the propeller shaft D in the power switching device T is higher than the lower end of the chassis frame F1 (the lower end surface of the lower flange portion F1a in the chassis frame F1). It is located above. In the power switching device T, the axial center position of the output shaft 108 that transmits the driving force to the hydraulic pump units 49 and 50 is arranged near the boundary between the chassis frame F1 and the subframe F2. The axis of the output shaft 108 and the axis of the hydraulic pump units 49 and 50 coincide with each other and exist on the same axis.

The power switching assembly TA is fixed so as to be suspended from the subframe F2 via supporting means arranged at a plurality of locations in the front-rear direction thereof. The support means includes a lashing member 110 that integrates the power switching device T and the hydraulic pump units 49 and 50, and a support member 112 that fixes the lashing member 110 to the subframe F2.

As shown in FIGS. 3 and 7, the lashing member 110 is on the side surface of the power switching device T and the hydraulic pump units 49, 50, and extends over the power switching device T and the hydraulic pump units 49, 50 in the front-rear direction. It is a member that integrates the power switching device T and the hydraulic pump units 49 and 50. As shown in FIG. 7, the lashing member 110 has a front plate-shaped portion 113 facing the side surface of the power switching device T and having a longitudinal direction in the vertical direction, and front and rear facing the side surfaces of the hydraulic pump units 49 and 50. A rear plate-shaped portion 114 whose direction is the longitudinal direction, and an upper plate-shaped portion 115 that connects the front plate-shaped portion 113 and the rear plate-shaped portions 114 at their upper ends are integrally provided. The front plate-shaped portion 113 and the rear plate-shaped portion 114 are formed along the vertical direction, and the upper plate-shaped portion 115 is formed along the left-right direction. The left and right lashing members 110 are integrated with each other by a connecting member 110A at the upper end thereof.

The support member 112 is a member that fixes the lashing member 110 to the subframe F2 via the cushioning bush 116. As shown in FIG. 7, the support members 112 are arranged apart from each other in the front-rear direction of the lashing member 110. As shown in FIG. 3, the support member 112 includes a facing plate-shaped portion 117 facing the upper plate-shaped portion 115 of the lashing member 110 below the support member 112, and a fixed plate-shaped portion 118 attached to the subframe F2 by a bolt 118a. Is integrally formed from. The upper plate-shaped portion 115 of the lashing member 110 and the facing plate-shaped portion 117 of the support member 112 are attached via the cushioning bush 116.

In the region where the power switching assembly TA is arranged at the above position, no cross member for connecting the subframes F2 is provided. Therefore, in the concrete pump vehicle of the present embodiment, a lateral connecting member 120 for ensuring rigidity is provided to connect the subframes F2 to each other in the vehicle width direction at a position avoiding the power switching assembly TA.

As shown in FIGS. 1 and 7, the lateral connecting member 120 is located on the upper side and the rear side of the power switching assembly TA, and is arranged along the vehicle width direction as shown in FIG. There is. In this case, a steel material having a U-shaped cross section is used for the lateral connecting member 120. In addition to the lateral connecting member 120, the subframe F2 is reinforced at the front and rear positions with respect to the power switching assembly TA by a conventionally provided cross member.

Further, as shown in FIG. 1, in the chassis frame F1, a front side lateral connecting member 120A for laterally connecting the chassis frames F1 to each other is provided on the front side of the power switching assembly TA, and on the rear side of the power switching assembly TA. A rear lateral connecting member 120B for laterally connecting the chassis frames F1 to each other is provided. The rigidity of the chassis frame F1 is ensured by the front lateral connecting member 120A and the rear lateral connecting member 120B. The position of the rear lateral connecting member 120B in the front-rear direction is the same as that of the lateral connecting member 120. The front lateral connecting member 120A is arranged below the gantry 96 and supports a part of the weight of the boom device B as a load. The front lateral connecting member 120A and the rear lateral connecting member 120B have the same configuration as the lateral connecting member 120.

As shown in FIG. 2, the concrete pump truck further includes a vertical connecting member 121 for ensuring rigidity. The vertical connecting member 121 is provided so as to connect the chassis frame F1 and the subframe F2 in the vertical direction at a position near the side of the power switching assembly TA. In this case, the vertical connecting member 121 is arranged by selecting a position corresponding to the position of the cross member omitted by arranging the power switching assembly TA at the above-mentioned position. That is, the vertical connecting member 121 is arranged at a position corresponding to the side of the power switching assembly TA.

The vertical connecting member 121 is a member that connects and ties the chassis frame F1 and the subframe F2 at an outer position in the vehicle width direction. The vertical connecting member 121 integrally includes a rectangular plate-shaped lower plate portion 122 fixed to the chassis frame F1 side by bolts 121a and a rectangular plate-shaped upper plate portion 123 fixed to the subframe F2 by welding. Be prepared. The vertical connecting member 121 is reinforced by ribs 124 along the vertical direction. Such a vertical connecting member 121 is arranged not only at a position corresponding to the omitted position of the cross member but also at a position necessary for reinforcing the vehicle body frame.

In this concrete pump vehicle, the power switching device T and the hydraulic pump units 49 and 50 are assembled to form a power switching assembly TA. The power switching assembly TA is supported by the subframe F2. Therefore, the subframe F2 needs to support a weight corresponding to the power switching assembly TA. Moreover, in the subframe F2, the cross member is omitted at the position where the power switching assembly TA is arranged.

However, in this concrete pump vehicle, instead of omitting the cross member connecting the subframe F2 at the position where the power switching assembly TA is arranged, a lateral connecting member 120 is prepared and placed near the upper side of the power switching assembly TA. The rigidity of the subframe F2 is ensured by arranging the subframes F2 at corresponding positions and connecting the subframes F2 to each other. Moreover, the vertical connecting member 121 is arranged at least at a position corresponding to the omitted position of the cross member. With this configuration, the subframe F2 can support the weight of the power switching assembly TA, and the rigidity is ensured.

Further, in this concrete pump vehicle, the power switching assembly TA is arranged below the upper end of the subframe F2 by omitting the cross member connecting the subframe F2 at the position where the power switching assembly TA is arranged. Was realized. With this configuration, the position of the center of gravity of the concrete pump truck is lowered, and the vehicle body can be stabilized accordingly.

Further, by providing the low position support portion 93 at the front portion of the subframe F2 and arranging the gantry 96 on the low position support portion 93, the gantry 96 is located at the low position of the subframe F2. Only the car body can be stabilized. As described above, the gantry 96 is fixed so as to pass to the low position support portion 93 of the pair of subframes F2. Therefore, the gantry 96 has a function as a lateral connecting member that connects the subframes F2 to each other in the lateral direction (vehicle width direction).

By the way, in general, in this kind of concrete pump truck, in order to increase the discharge flow rate and the discharge pressure of ready-mixed concrete, a corresponding large power switching device T and hydraulic pump units 49 and 50 are required. Regarding this, in the present embodiment, in the power switching assembly TA, the power switching device T and the hydraulic pump units 49 and 50 are arranged side by side in the front-rear direction. That is, in the power switching assembly TA, instead of enlarging one hydraulic pump unit, by connecting it as a plurality of hydraulic pump units 49, 50, it is made into a hydraulic pump unit having a substantially large capacity, and ready-made concrete. It is possible to increase the discharge flow rate and discharge pressure of.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. The same applies to the specific configuration of each part.

In the above embodiment, instead of the cross member omitted in the region where the power switching assembly TA is arranged, the lateral connecting member 120 for ensuring rigidity and the vertical connecting member 121 are provided. However, by providing at least one of the horizontal connecting member 120 and the vertical connecting member 121, it is possible to substitute the omitted cross member.

In the above embodiment, a concrete pump truck having a configuration in which ready-mixed concrete is pumped using an S valve is illustrated. However, as a configuration for pumping ready-mixed concrete, it can also be applied to a squeeze type concrete pump truck in which ready-mixed concrete is pumped by squeezing a pumping tube set on the inner circumference of a cylindrical drum while squeezing it with a roller. Further, in the above embodiment, the case where the hydraulic circuit is an open circuit in which the hydraulic oil is sucked from the tank and returned to the tank is illustrated. However, the present invention can also be applied to a configuration using a closed circuit as a hydraulic circuit.

In the above embodiment, the power switching device is provided in the middle of the propeller shaft of the vehicle and is configured to take out power from the propeller shaft, but is not limited to this, and is configured to take out the power of the engine from another drive mechanism. You can also do it.

In the above embodiment, the case where the lateral connecting member 120 is arranged along the vehicle width direction, that is, the case where the lateral connecting member 120 is provided orthogonal to the subframe F2 is illustrated. However, if the lateral connecting member 120 is passed between the subframes F2 so as to connect the end portion in the vehicle width direction to the subframe F2, the longitudinal length of the subframe F2 is other than the direction orthogonal to the subframe F2. It may be arranged at an angle with respect to the direction. That is, the lateral connecting member 120 may be configured to connect the subframes F2 with each other in a state where both ends thereof are displaced in the front-rear direction.

In the above embodiment, the case where the vertical connecting member 121 is provided so as to connect the chassis frame F1 and the subframe F2 in the vertical direction is illustrated. However, if the upper end of the vertical connecting member 121 is connected to the chassis frame F1 and the lower end is connected to the subframe F2, the vertical connecting member 121 is arranged so as to be inclined in the front-rear direction with respect to the vertical direction in addition to the vertical direction. You may.

1 ... concrete pump, 2 ... concrete pump body, 49, 50 ... hydraulic pump unit, 49a ... gear, 93 ... low position support part, 94 ... high position support part, 110 ... lashing member, 112 ... support member, 113 ... Front plate-shaped portion, 114 ... Rear plate-shaped portion, 115 ... Upper plate-shaped portion, 117 ... Opposing plate-shaped portion, 118 ... Fixed plate-shaped portion, 120 ... Horizontal connecting member, 121 ... Vertical connecting member, 122 ... Lower Plate part, 123 ... Upper plate part, B ... Boom device, D ... Propeller shaft, F1 ... Chassis frame, F2 ... Subframe, T ... Power switching device, TA ... Power switching assembly

Claims (2)

A chassis frame arranged in parallel at a predetermined interval in the vehicle width direction and a subframe mounted and fixed on the chassis frame at a predetermined interval in the vehicle width direction are provided.
A boom device for connecting a plurality of beams to supply concrete to the casting position, a concrete pump for pumping concrete toward the casting position, and a hydraulic pump for supplying hydraulic oil to the concrete pump. Further comprising a pump and a power switching device configured to extract the driving force of the hydraulic pump from the vehicle drive mechanism.
The hydraulic pump and the power switching device are assembled to form a power switching assembly.
The power switching assembly is arranged below the upper end of the subframe.
A lateral connecting member arranged on the upper side of the power switching assembly along the vehicle width direction to connect the subframes in the vehicle width direction, and the chassis frame and the sub at a position near the side of the power switching assembly. A concrete pump vehicle characterized in that it is provided with at least one of the vertical connecting members that connect the frames in the vehicle height direction. The concrete pump vehicle according to claim 1, further comprising a lateral connecting member different from the lateral connecting member, which connects the chassis frames to each other in the vehicle width direction at front and rear positions of the power switching assembly.

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