JP2010215404A - Mobile crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile crane simplifying a piping structure for connection between a hydraulic motor for driving a winch and hydraulic equipment. <P>SOLUTION: The mobile crane includes a winch drum 31 disposed at a front section of a base frame 12 that becomes the front side of the basal end of a boom 4; and a winch motor 32 connected to the winch drum 31 so that the winch drum 31 is rotatably driven, and is connected to a direction control valve 53 and a brake release valve 56. At least a part of the winch motor 32 protrudes rightward and is disposed closer to a covering member 21 than the boom 4. The covering member 21 covers from above and around at least a part of the winch motor 32 protruding beyond the boom 4, the direction control valve 53, and the brake release valve 56. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a small crane.

  Conventionally, for example, a small crane as disclosed in Patent Document 1 is known. FIG. 12 is a side view showing a schematic configuration of a crane according to Patent Document 1. As shown in FIG. FIG. 13 is a plan view showing a schematic configuration of the crane of FIG.

  Referring to FIGS. 12 and 13, a crane 100 includes a lower traveling body 101, an upper swinging body 102 that is turnably mounted on the lower traveling body 101, and a boom that can be raised and lowered on the upper swinging body 102. 103 and a boom hoisting cylinder 104 for raising and lowering the boom 103.

  The upper swing body 102 includes an upper frame 105 and a mounting frame 106 provided between the driver's seat 120 and the machine room 121 on the upper frame 105.

  As shown in FIG. 13, the mounting frame 106 includes a pair of left and right plate members 107, 108 that are long in the front-rear direction. The plate members 107, 108 have boom foot pins 109 (see FIG. 12) that are the center of the boom 103. Is provided. A boom hoisting cylinder 104 is provided between the boom 103 and the mounting frame 106.

  A winch 110 is provided below the boom hoisting cylinder 104 below the front end of the upper swing body 102 so that the rope R for raising and lowering the hook 115 can be fed and wound. The winch 110 includes a winch drum 111 for winding the rope R, and a drive unit 112 such as a hydraulic motor that rotationally drives the winch drum 111. The rope R fed from the winch drum 111 is guided to the hook 115 at the tip of the boom 103 through a sheave 114 provided between the plate members 107 and 108.

  The winch drum 111 is disposed between the two plate members 107 and 108 as shown in FIG. 13, while the drive unit 112 is on the right side of the right plate member 107 and as shown in FIG. It is arranged on the front side of the upper frame 105 below the drum 111.

  In the crane 100 according to Patent Document 1, since the winch 110 is disposed below the boom hoisting cylinder 104 at the lower front end of the upper swing body 102, the height position of the boom 103 is restrained from being restricted by the winch 110. By doing so, the position of the boom 103 can be lowered. That is, according to the crane 100 according to Patent Document 1, the winch 110 is disposed at a position higher than the machine room 121 at the rear portion of the upper swing body 102, and the boom 103 is disposed above the winch 110. In comparison, the position of the boom 103 can be lowered.

JP 2006-96506 A

  The hydraulic motor for driving the winch included in the driving unit 112 needs to be connected to the hydraulic equipment via a hydraulic pipe in order to exchange hydraulic oil with the hydraulic equipment provided on the upper frame 105. However, the piping structure for that purpose must be complicated.

  Specifically, the hydraulic motor is connected to the winch drum 111 supported at the front end portion of the upper frame 105, while the hydraulic equipment is stored in the machine chamber 121 for protection thereof. In order to connect the motor and the hydraulic equipment, for example, it is necessary to make a hole in the wall of the machine room 121 and pass the connection pipe through the hole. In this way, when connecting the hydraulic motor and the hydraulic equipment by the connecting pipe through the hole of the machine room 121, it is difficult to route the connecting pipe. Further, in order to pass each pipe through the common hole of the machine room 121, the connection pipe must be remarkably turned, which increases the pipe length of the pipe.

  An object of the present invention is to provide a mobile crane capable of simplifying a piping structure for connection between a hydraulic motor for driving a winch and a hydraulic device.

  In order to solve the above problems, the present invention is a mobile crane, which is a self-propelled lower traveling body, a base frame provided on the lower traveling body, and can be raised and lowered with respect to the base frame A boom having a base end supported by the base, a cab standing on the base frame at a position deviated from the boom in the left-right direction, and a base opposite to the cab in the left-right direction across the boom A hydraulic device provided at a position on the frame; a covering member that is disposed closer to the hydraulic device than the boom and covers the hydraulic device from above and around; and a base frame that is the front side of the base end portion of the boom A winch drum that is provided at a front portion and winds a rope for raising and lowering a hook suspended at the tip of the boom, and the winch drum so that the winch drum can be driven to rotate. A hydraulic motor connected to the drum and connected to the hydraulic device, wherein at least a part of the hydraulic motor protrudes to the opposite side of the cab and is disposed closer to the covering member than the boom, The covering member is configured to cover at least a part of the hydraulic motor protruding from the boom and the hydraulic equipment from above and from the periphery.

  According to the present invention, the hydraulic motor connected to the winch drum protrudes from the winch drum to the side opposite to the cab, and this hydraulic motor is covered with the common covering member together with the hydraulic equipment. The hydraulic motor and the hydraulic equipment can be connected to each other with a simple piping structure. Furthermore, since the hydraulic motor can be covered from above and from the side by the covering member, the hydraulic motor can be protected.

  Further, according to the present invention, unlike the conventional configuration in which the hydraulic motor and the hydraulic equipment are connected by the hydraulic piping connecting the inside and outside of the covering member, the relative positional relationship between the hydraulic motor and the hydraulic equipment without being restricted by the covering member. Therefore, the degree of freedom in layout for simplifying the piping structure is high.

  Specifically, the hydraulic device can be disposed at at least one of a position adjacent to the hydraulic motor on the side away from the boom and a position adjacent to the hydraulic motor on the rear side.

  According to this configuration, compared with the conventional case where the hydraulic piping is routed through the hole of the covering member, the hydraulic motor and the hydraulic equipment connected to the hydraulic motor can be directly connected by a short piping. A simpler and more efficient piping structure can be realized.

  In the mobile crane, it is preferable that the hydraulic motor is connected to a lateral side surface of the winch drum and protrudes from the side surface of the winch drum to the covering member side.

  According to this configuration, since the winch drum and the hydraulic motor are arranged side by side, it is possible to prevent the covering member from becoming bulky even when a large-capacity winch drum is employed.

  In other words, when a large-capacity winch drum is used, the space occupied by the winch drum expands to the left and right. In addition, a wide space is required in the vertical and forward / backward directions, but by arranging the winch drum and the hydraulic motor side by side as in the above configuration, a large space in the left / right direction is also provided as a space for arranging them. It is only necessary to secure it, and it becomes unnecessary to widen the vertical and front / rear spaces, so that the covering member covering the hydraulic motor can be prevented from becoming bulky. In particular, in recent years, there is a case where it is desired to increase the capacity of the winch drum for the purpose of increasing the lift and the like, and the above configuration is effective in such a case.

  In the mobile crane, the covering member includes a ceiling part, and an inclined part having a stepped part for inclining forward from the front end of the ceiling part and rising to the ceiling part, and the hydraulic motor is Among the hydraulic devices, one that is taller than the hydraulic motor is disposed at a position corresponding to a ceiling portion of the covering member, and the hydraulic device is disposed at a position corresponding to the inclined portion of the covering member. It is preferable that the thing equivalent to a motor or shorter than this is arrange | positioned in the position corresponding to the inclination part of the said covering member.

  According to this configuration, the hydraulic device that is taller than the hydraulic motor is disposed corresponding to the ceiling portion of the covering member with less internal space restrictions, and the hydraulic device that is the same as or lower than the hydraulic motor However, it is possible to easily perform piping of the hydraulic motor while effectively using the internal space of the covering member.

  In the mobile crane, a sheave that is provided between the base end portion of the boom and the winch drum in the front-rear direction, guides the rope from the winch drum to the distal end side of the boom, and further moves in the left-right direction. A center position of the winch drum in the left-right direction is shifted from the center position of the boom in a direction away from the cab, and a center position of the sheave movement range is It is preferable that the center position of the winch drum is displaced from the center position.

  According to this configuration, since the central position of the winch drum and the central position of the sheave movement range are shifted to the same side in the left-right direction with respect to the central position of the boom, while adopting a large-capacity winch drum, The fleet angle can be reduced.

  In other words, when a large-capacity winch drum is arranged beside the cab, it is necessary to shift the position of the winch drum away from the cab so as not to interfere with the cab. Although the center position of the boom is displaced, as in the above configuration, the center position of the sheave movement range is deliberately shifted to the same side as the center position of the winch drum to bring both center positions closer. Can reduce the fleet angle.

  In the mobile crane, a direction control valve capable of controlling the operating direction of the hydraulic motor by switching the direction of supplying hydraulic oil to the hydraulic motor and discharging the hydraulic oil from the hydraulic motor, and an input operation. Receiving an operation member capable of supplying pilot pressure to the directional control valve, a brake member for locking the operation of the hydraulic motor in a non-operating state, and the operation member being operated, A release member that releases a lock of the hydraulic motor by supplying a pilot pressure to the brake member may be further included, and the hydraulic device may include the directional control valve and the release member.

  ADVANTAGE OF THE INVENTION According to this invention, the piping structure for the connection of the hydraulic motor for winch drive and hydraulic equipment can be simplified.

1 is a perspective view showing an overall configuration of a mobile crane according to an embodiment of the present invention. It is a left view which abbreviate | omits and shows a part of mobile crane of FIG. FIG. 2 is a perspective view mainly showing a frame of an upper swing body of the mobile crane of FIG. 1. It is a top view which mainly shows the flame | frame of the upper turning body of the mobile crane shown in FIG. It is a circuit diagram which shows a part of hydraulic system provided in the mobile crane shown in FIG. It is a perspective view which expands and shows a part of FIG. It is a perspective view when the winch of FIG. 6 is seen from another viewpoint. It is a top view which shows the relationship between a turning frame, each standing board, and a support part. It is a top view which shows the relationship between a turning frame, each standing board, and a support part. It is a top view which shows the relationship between a turning frame, each standing board, and a support part. It is a top view which shows the positional relationship of the left-right direction of a winch drum, a sheave, and a boom. It is a side view showing a schematic structure of a crane concerning patent documents 1. It is a top view which shows schematic structure of the crane of FIG.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an overall configuration of a mobile crane according to an embodiment of the present invention. FIG. 2 is a left side view showing the mobile crane of FIG. 1 with a part thereof omitted. FIG. 3 is a perspective view mainly showing a frame of the upper swing body of the mobile crane of FIG. FIG. 4 is a plan view mainly showing a frame of the upper swing body of the mobile crane shown in FIG.

  1 to 4, a mobile crane 1 includes a lower traveling body 2 having a pair of crawlers 2a, an upper revolving body 3 provided on the lower traveling body 2 and having a cab 20, and an upper revolving body. 3 and a boom 4 that is pivotally supported by the hoist. In addition, it demonstrates below using the front-back and left-right direction seen from the passenger | crew in the cab 20. As shown in FIG.

  The base end portion of the boom 4 is supported by the upper swing body 3 so as to be rotatable around the boom foot pin 5. The boom 4 undulates forward and backward according to the expansion and contraction of the undulation cylinder 6 provided between the upper swing body 3 and the boom 4. Specifically, the boom 4 can be raised and lowered between the forward-facing posture shown in FIG. 1 and the standing posture shown in FIG. The boom 4 is a five-stage telescopic boom having a first-stage boom 7 to a fifth-stage boom 11 and a hook F suspended from the tip of the fifth-stage boom 11, and is a hydraulic cylinder not shown. When the booms 7 to 11 are relatively displaced in accordance with the expansion and contraction of each, the entire boom is expanded and contracted.

  The upper revolving unit 3 includes a revolving frame (base frame) 12 that is turnably mounted on the lower traveling unit 2 and a pair of left and right upright plates that are erected at a substantially central position in the left and right direction of the revolving frame 12 (see FIG. 3) 14, 15, a support part 16 (see FIG. 10) provided at the front part of the revolving frame 12, a winch 17 supported by the support part 16, and a rope R from the winch 17, Sheave 18 for guiding to hook F, hydraulic system (see FIG. 5) 19 for driving winch 17, cab 20 standing on the left side of left standing plate 15, and right standing plate 14 A covering member 21 provided on the right side of the cover member 21, a hydraulic oil tank 22 and a fuel tank 23 (see FIG. 3) arranged side by side at the rear portion of the covering member 21, and an engine 24 (FIG. See) And a guard 25 for covering the engine 24.

  The standing plates 14 and 15 are plate members that extend in the front-rear direction in a posture in which the thickness direction is along the left-right direction. The side surface shape of each of the upright plates 14 and 15 will be described. As shown in FIGS. 2 and 3, the connecting portion 26 with the revolving frame 12 is long in the front-rear direction, and the connecting portion 26 has a substantially central position in the front-rear direction. The extending portion 27 extends upward, and the inclined portion 28 extends obliquely upward and rearward from the upper end of the extending portion 27.

  As shown in FIG. 2, a boom foot pin 5 extending in the left-right direction is provided between the inclined portions 27, and the boom 4 is pivotally supported around the boom foot pin 5 so as to be raised and lowered. Further, a sheave shaft 29 extending in the left-right direction is provided between the extending portions 27, and the sheave 18 is rotatably supported around the sheave shaft 29. Further, a support shaft 30 extending in the left-right direction is provided between the extending portions 27 in front of and below the sheave shaft 29 and can be rotated around the support shaft 30. As described above, the base end portion of the hoisting cylinder 6 is pivotally supported.

  And the front-end parts 14a and 15a (the front part of the connection part 26: refer FIG.2 and FIG.8) of each said standing board 14 and 15 are short compared with another part. The front end portions 14a and 15a of each of the standing plates 14 and 15 constitute a part of a support portion 16 to be described later and support the winch 17. As shown in FIG. 2, the winch 17 supported by the support portion 16 is disposed on the front side and the lower side of the hoisting cylinder 6. Therefore, the height position of the boom 4 is not restricted by the winch 17, and the boom 4 can be arranged low.

  6 is an enlarged perspective view showing a part of FIG. FIG. 7 is a perspective view when the winch of FIG. 6 is viewed from another viewpoint. 8-10 is a top view which shows the relationship between a turning frame, each standing board, and a support part, respectively.

  6-10, the winch 17 is provided at the right end portion of the winch drum 31 for winding the rope R for raising and lowering the hook F of the boom 4 and the winch drum 31, and the winch A winch motor (drive unit) 32 is provided for rotating the drum 31 about the axis in the left-right direction. The support 16 for supporting the winch 17 on the revolving frame 12 will be described below.

  The support portion 16 includes front end portions 14a and 15a (see FIG. 8) of the standing plates 14 and 15, a support plate 33 (see FIG. 9) fixed on the front end portions 14a and 15a, and the support plate 33. And four reinforcing plates 34, 35, 36, 37 (see FIG. 8) provided between the rotating frame 12 and a pair of left and right mounting plates 38, 39 (see FIG. 10) mounted on the support plate 33. ) And holding members 40 and 41 (see FIG. 10) standing on the mounting plates 38 and 39, respectively.

  As shown in FIG. 9, the support plate 33 is a plate member that is disposed so as to straddle the front end portions 14 a, 15 a of the standing plates 14, 15 and has a U-shaped planar shape that opens forward. . Specifically, the support plate 33 includes a right support portion 42 that is positioned on the front end portion 14a of the standing plate 14, a left support portion 43 that is positioned on the front end portion 15a of the standing plate 15, and the support portions 42, It has the connection part 44 which connects 43 by the rear part, and is welded to the upper end surface of the front-end parts 14a and 15a of each standing board 14 and 15. FIG. The right support portion 42 is formed with a pair of front and rear insertion holes 42 a and 42 b that penetrate the support plate 33 up and down on the right side of the standing plate 14. The left support portion 43 is formed with a pair of front and rear insertion holes 43a and 43b penetrating the support plate 33 vertically on the right side of the standing plate 15.

  As shown in FIG. 6, the reinforcing plates 34 and 35 are substantially rectangular plate materials. As shown in FIGS. 6 and 8, the reinforcing plates 34 and 35 are disposed between the revolving frame 12 and the support plate 33, and the upper surface of the revolving frame 12, the lower surface of the support plate 33, and the upright plate 14. Each of them is welded to the right side surface and plays a role in strengthening the connection between these three members.

  The reinforcing plates 36 and 37 are substantially rectangular plate materials like the reinforcing plates 34 and 35. As shown in FIG. 8, these reinforcing plates 36 and 37 are arranged between the revolving frame 12 and the support plate 33, and are provided on the upper surface of the revolving frame 12, the lower surface of the support plate 33, and the right side surface of the standing plate 15. Each is welded. The reason why the reinforcing plates 36 and 37 are arranged on the right side instead of the left side of the standing plate 15 is to avoid interference with the cab 20 located on the left side of the standing plate 15.

  As shown in FIG. 10, the mounting plate 38 is a plate member having a size equivalent to that of the right support portion 42. The mounting plate 38 is formed with a pair of female screw portions 38a, 38b at the same pitch as the insertion holes 42a, 42b. Similarly, the mounting plate 39 is formed with a pair of female screw portions 39a, 39b at the same pitch as the insertion holes 43a, 43b. The mounting plate 38 is placed on the support plate 33 so that the female screw portions 38a, 38b and the insertion holes 42a, 42b coincide, and the female screw portions 39a, 39b and the insertion holes 43a, 43b coincide. Each mounting plate 38 can be attached to the support plate 33 by screwing bolts from below 33.

  As shown in FIG. 10, the holding member 40 includes a vertical plate 45 erected along the right edge of the mounting plate 38 and a pair of front and rear erected along the front and rear edges of the mounting plate 38. Horizontal plates 46 and 47 are provided. The horizontal plates 46 and 47 are formed shorter than the vertical plate 45 (see FIG. 6), and are welded to the front and rear end surfaces of the vertical plate 45, respectively.

  As shown in FIGS. 7 and 10, the holding member 41 is erected on the attachment plate 39 on the left side of the vertical plate 48 that is erected along the right edge of the attachment plate 39. A pair of front and rear horizontal plates 49 and 50 is provided. The horizontal plates 49 and 50 are welded to the left side surface of the vertical plate 48 and the upper surface of the mounting plate 39, respectively.

  As shown in FIGS. 6 and 7, the winch 17 is supported on the revolving frame 12 while being sandwiched between the vertical plate 45 and the vertical plate 48. Specifically, the vertical plate 45 is fixed to the right side surface of the winch motor 32 by a plurality of bolts B1. On the other hand, the vertical plate 48 is fixed to the left side surface of the winch drum 31. The height dimensions of the vertical plates 45 and 48 are set so that the lower surface of the winch drum 31 held between the vertical plates 45 and 48 is higher than the upper surface of the mounting plate 38.

  Further, as shown in FIG. 11, the center position C1 in the left-right direction of the winch drum 31 supported by the support portion 16 is the center position C2 in the left-right direction of the boom 4 (distance between the standing plates 14 and 15). The position is shifted. This is a result of arranging the left side surface of the winch drum 31 on the right side of the right side surface of the cab 20, and the larger the winch drum 31 in the left-right direction, the greater the width of the misalignment between the center positions C1 and C2. become.

  In this embodiment, the center position C3 in the left-right direction of the moving range of the sheave 18 is shifted to the side where the center position C1 of the winch drum 31 is displaced with respect to the center position C2 in the left-right direction of the boom 4. Has been placed. More specifically, the moving range of the sheave 18 is set so that the central position C1 of the winch drum 31 and the horizontal position C3 of the moving range of the sheave 18 coincide. Therefore, even if the central position C1 of the winch drum 31 and the central position C2 of the boom are displaced from each other, it is possible to suppress an increase in the fleet angle.

  FIG. 5 is a circuit diagram showing a part of a hydraulic system provided in the mobile crane shown in FIG.

  Referring to FIG. 5, the hydraulic system 19 includes a hydraulic pump 51, the winch motor 32 that receives hydraulic oil from the hydraulic pump 51 and rotates, a negative brake 52 provided on the winch motor 32, A directional control valve 53 capable of switching the supply direction of hydraulic oil from the hydraulic pump 51 to the winch motor 32 and the discharge direction from the winch motor 32 to the tank T, and for supplying pilot pressure to the directional control valve 53 A pilot oil passage 54, an operation lever 55 that receives pilot operation to supply pilot pressure to the pilot oil passage 54, a brake release valve 56 that is operated according to the pilot pressure, and whether or not the operation lever 55 is operated Regardless of this, a forced stop valve 57 that can open the pilot circuit 54 to the tank T is provided.

  The negative brake 52 is configured to brake the winch motor 32 at normal times and to release the braking state when hydraulic oil is supplied from the brake release valve 56.

  The brake release valve 56 is switched according to the pilot pressure supplied via the shuttle valve 58, and releases the braking state by the negative brake 52. Specifically, the brake release valve 56 opens the oil path on the negative brake 52 side to the tank T in a state where the pilot pressure is not supplied, and supplies hydraulic oil to the negative brake 52 when the pilot pressure is supplied. Switching to the position is performed.

  The forced stop valve 57 is switched according to an electric signal from a controller 59 provided in the upper swing body 3 to return the direction control valve 53 to the neutral position and to set the brake release valve 56 to the initial position (see FIG. 4). Specifically, the forced stop valve 57 is switched to a position where the pilot oil passage 54 is closed during normal operation and the pilot oil passage 54 is opened to the tank T in accordance with a signal from the controller 59. The controller 59 detects an overload detection sensor (not shown) that detects whether or not the suspension load exceeds a preset value, and whether or not the rope is overwound (overwinding) by the winch. An overwinding detection sensor (not shown) is connected, and an electrical signal is output to the forced stop valve 57 when signals indicating overload or overwinding are received from these sensors.

  The direction control valve 53 and the brake release valve 56 are disposed in the vicinity of the winch motor 32 as shown in FIGS. As shown in FIG. 1, the winch motor 32, the brake release valve 56, and the direction control valve 53 are covered from above and from the sides (front and left) by a common covering member 21. As described above, the winch motor 32 and the hydraulic equipment (the brake release valve 56 and the direction control valve 53) connected to the winch motor 32 are disposed in the common covering member 21, so that piping of these equipment is easily performed. be able to.

  Hereinafter, the positional relationship between the covering member 21, the winch motor 32, the direction control valve 53, and the brake release valve 56 will be described.

  As shown in FIG. 1, the covering member 21 includes a ceiling portion 60 that has the same height as the fuel tank 23 and the hydraulic oil tank 22, an inclined portion 61 that extends downward from the front end of the ceiling portion 60, and the inclination A front surface 62 suspended from the front end of the portion 61, and a ceiling portion 60, an inclined portion 61, and a right side surface 63 provided on the right side of the front surface 62 are provided. In the inclined portion 61, a stair 61a is formed on which the operator ascends on the covering member 21 and the guard 25 during refueling and maintenance of the engine 24.

  As shown in FIG. 3, among the direction control valve 53, the winch motor 32 and the brake release valve 56, the uppermost position is the direction control valve 53 having a number of spools, and the next highest is the winch. The motor 32 is the lowest, and the brake release valve 56 is the lowest. In the present embodiment, the tallest directional control valve 53 is disposed corresponding to the ceiling portion 60 that is the highest portion of the covering member 21, and the winch motor 32 is disposed in a portion corresponding to the inclined portion 61 of the covering member 21. Since the brake release valves 56 are arranged side by side on the left and right, the internal space of the covering member 21 can be used effectively.

  As described above, according to the above-described embodiment, the winch motor 32 connected to the winch drum 31 is protruded from the winch drum 31 to the side opposite to the cab 20, and the winch motor 32 is released from the direction control valve 53 and the brake release. Since the valve 56 (hereinafter referred to as hydraulic equipment 53, 56) is covered with a common covering member 21, the winch motor 32 and the hydraulic equipment 53, 56 are simply connected to the inside of the covering member 21. Can be connected with. Further, since the winch motor 32 can be covered from above and from the sides (front and left) by the covering member, the winch motor 32 can be protected.

  Moreover, according to the said embodiment, unlike the conventional structure which connects a winch motor and hydraulic equipment with the hydraulic piping which connects the inside and outside of a coating | coated member, the winch motor 32 and the hydraulic equipment 53, without being restrict | limited by the coating | coated member 21, Since the relative positional relationship with 56 can be set, the degree of freedom in layout for simplifying the piping structure is high.

  Specifically, as in the above-described embodiment, the brake release valve 56 is disposed at a position adjacent to the side away from the boom 4 (right side), and the direction control valve 53 is disposed at a position adjacent to the rear side of the winch motor 32. Thus, compared with the conventional case where the hydraulic piping is routed through the hole of the covering member, the winch motor 32 and the hydraulic devices 53 and 56 connected thereto can be directly connected by a short piping, A simple and efficient piping structure can be realized.

  According to the configuration in which the winch drum 31 and the winch motor 32 are arranged side by side as in the above-described embodiment, the covering member 21 is prevented from becoming bulky even when the large-capacity winch drum 32 is employed. can do.

  In other words, when a large-capacity winch drum 31 is employed, the space occupied by the winch drum 31 increases in the left and right directions. Therefore, when the winch motor 32 is connected to the front and rear or the top and bottom of the winch drum 31, In addition to the left and right spaces, a wide space is required not only on the left and right but also on the top and bottom or front and back. On the other hand, the winch drum 31 and the winch motor 32 are arranged side by side as in the above-described embodiment. It is only necessary to secure a wide space in the left-right direction, and it is not necessary to widen the vertical and front-rear spaces, so that the covering member 21 covering the winch motor 32 can be prevented from becoming bulky.

  As in the above embodiment, the directional control valve 53 that is taller than the winch motor 32 is disposed corresponding to the ceiling portion 60 of the covering member 21, and the brake release valve 56 that is shorter than the winch motor 32 is disposed as the covering member. According to the configuration arranged corresponding to the inclined portion 61 of 21, it is possible to easily perform piping of the winch motor 32 while effectively utilizing the internal space of the covering member 21.

  According to the configuration in which the central position C1 of the winch drum 31 and the central position C3 in the moving direction of the sheave 18 are displaced to the same side in the left-right direction with respect to the central position C2 of the boom 4 as in the above embodiment. While adopting a large-capacity winch drum 32, the fleet angle can be reduced.

  That is, when a large-capacity winch drum 31 is disposed beside the cab 20, the position of the winch drum 31 needs to be shifted to the side away from the cab 20 so as not to interfere with the cab 20, and as a result, the winch Although the center position C1 of the drum 31 and the center position C2 of the boom 4 are displaced, the center position C3 of the moving range of the sheave 18 is the same side as the center position C1 of the winch drum 31 as in the above-described embodiment. By deliberately shifting the position to the right side, both the center positions C1 and C3 can be brought closer to each other, so that the fleet angle can be reduced.

C1-C3 Center position F Hook R Rope 1 Mobile crane 2 Lower traveling body 3 Upper swing body 4 Boom 5 Boom footpin 6 Lifting cylinder 12 Swivel frame (base frame)
14, 15 Standing plate 17 Winch 18 Sheave 20 Cab 21 Cover member 31 Winch drum 32 Winch motor 33 Support plate 38, 39 Mounting plate 40, 41 Holding member 42, 43 Support portion 53 Direction control valve 56 Brake release valve 60 Upper surface 61 Inclined surface 61a Stairs

Claims (6)

A mobile crane,
A self-propelled undercarriage,
A base frame provided on the lower traveling body;
A boom having a proximal end supported in a undulating manner with respect to the base frame;
A cab erected on the base frame at a position deviated from the boom in the left-right direction;
Hydraulic equipment provided at a position on a base frame that is opposite to the cab in the left-right direction across the boom;
A covering member that is disposed closer to the hydraulic device than the boom and covers the hydraulic device from above and around;
A winch drum that is provided at the front portion of the base frame that is the front side of the base end portion of the boom and winds a rope for lifting and lowering a hook suspended at the tip of the boom;
A hydraulic motor coupled to the winch drum so that the winch drum can be rotationally driven, and connected to the hydraulic device;
At least a part of the hydraulic motor protrudes on the opposite side of the cab and is disposed on the covering member side of the boom,
The mobile crane according to claim 1, wherein the covering member is configured to cover at least a part of the hydraulic motor protruding from the boom and the hydraulic equipment from above and around.   The hydraulic device is disposed at at least one of a position adjacent to a side away from the boom with respect to the hydraulic motor and a position adjacent to a rear side of the hydraulic motor. Item 2. The mobile crane according to Item 1.   3. The mobile crane according to claim 1, wherein the hydraulic motor is connected to a lateral side surface of the winch drum and protrudes from the side surface of the winch drum toward the covering member. The covering member has a ceiling portion, and an inclined portion having a staircase portion for inclining forward from the front end of the ceiling portion and rising to the ceiling portion,
The hydraulic motor is disposed at a position corresponding to the inclined portion of the covering member,
Among the hydraulic devices, those that are taller than the hydraulic motor are arranged at positions corresponding to the ceiling of the covering member, and those that are equal to or shorter than the hydraulic motor are The mobile crane according to claim 1, wherein the mobile crane is disposed at a position corresponding to the inclined portion of the covering member. A sheave that is provided between the base end portion of the boom and the winch drum in the front-rear direction, guides the rope from the winch drum to the distal end side of the boom, and further moves in the left-right direction;
The center position in the left-right direction of the winch drum is arranged so as to be displaced on the side away from the cab with respect to the center position in the left-right direction of the boom,
The center position of the moving range of the sheave is shifted to the center position side of the winch drum with respect to the center position of the boom. Mobile crane. A directional control valve capable of controlling the operation direction of the hydraulic motor by switching the direction of supply of hydraulic oil to the hydraulic motor and the direction of discharge of hydraulic oil from the hydraulic motor;
An operation member capable of supplying a pilot pressure to the direction control valve in response to an input operation;
A brake member that locks the operation of the hydraulic motor in a state where the operation member is not operated;
A release member that supplies a pilot pressure to the brake member to release the lock of the hydraulic motor when the operation member is operated;
The said hydraulic equipment contains the said direction control valve and the said cancellation | release member, The mobile crane of any one of Claims 1-5 characterized by the above-mentioned.

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