CN110142725B - Hydraulic working device - Google Patents

Abstract

The present invention relates to a hydraulic working apparatus. A connecting section (68, 68 m) is provided at the tip of one of a rotating member (41) (the 1 st rotating shaft) of a tool unit (10) and a rotating shaft (62 a) (the 2 nd rotating shaft) of a drive unit (60), and a connected section (52, 52 m) for connecting the connecting section (68, 68 m) is provided at the tip of the other. The connecting sections (68, 68 m) have a guide shaft (68 a) that can rotate integrally with the rotating member (41) or the rotating shaft (62 a), and a plurality of engaging sections (68 b, 68 p) provided around the guide shaft (68 a). The coupled sections (52, 52 m) have guide holes (52 a) into which the guide shafts (68 a) are inserted, and engaged sections (52 b, 52 q) that are provided around the guide holes (52 a) and with which the engaging sections (68 b, 68 p) engage.

Description

Hydraulic working device

Technical Field

The present invention relates to a hydraulic working apparatus including: a tool unit having a tool that operates using pressure oil generated by a hydraulic pump; and a drive unit which is detachable from the tool unit and has a motor for driving and rotating a rotary member of a hydraulic pump provided in the tool unit.

Background

Conventionally, a portable hydraulic working apparatus has been used for rescue applications, and an example thereof is described in japanese patent application laid-open No. 2010-280011 (JP 2010-280011A) which is a publication of a japanese patent application. A hydraulic working apparatus described in japanese patent application laid-open No. 2010-280011 includes: a hydraulic pressure generation unit having a battery, an electric motor powered by the battery, and a hydraulic pump driven by the electric motor; and a head unit which is attachable to and detachable from the hydraulic pressure generation unit and has a tip tool driven by the pressure oil generated by the hydraulic pressure generation unit. As the tip tool provided in the head unit, various types of tip tools such as a cutter and a dilator are prepared, and it is possible to cope with various operations by replacing the head unit. Further, by allowing the hydraulic pressure generating unit and the head unit to be separable, portability can be improved and the burden on the operator at the site can be reduced.

Disclosure of Invention

A portable hydraulic work apparatus may be configured by a drive unit having an electric motor and a head unit (tool unit) that is attachable to and detachable from the drive unit and includes a hydraulic pump that is driven to rotate by the electric motor of the drive unit and a tip tool that is operated by hydraulic pressure generated by the hydraulic pump. In this case, a detachable torque transmission joint for transmitting torque from the driving-side rotation shaft to the driven-side rotation shaft needs to be provided between the driving unit and the head unit.

When considering rescue use, it is necessary to rapidly perform engagement and disengagement of the torque transmission joint. Here, the torque transmission joint of the mesh type (key/keyway type, dog clutch type, etc.) must align the rotational phases of the driving-side rotating shaft and the driven-side rotating shaft when coupling, and the coupling operation takes time. In the case of using a magnetic joint as the torque transmission joint, the separation operation is troublesome, the structure is complicated, and the cost becomes high.

The present invention has been made in view of such a situation, and an object thereof is to provide a hydraulic working apparatus which can easily couple and decouple a driven-side rotating shaft (1 st rotating shaft) of a tool unit and a driving-side rotating shaft (2 nd rotating shaft) of a driving unit, and which is provided with a rotational torque transmission member (transmission joint) that can be realized at low cost.

A hydraulic working apparatus according to the present invention is characterized by comprising: a tool unit including a hydraulic pump that generates pressure oil by rotating a rotary member, a 1 st rotary shaft connected to the rotary member, and a tool that operates using the pressure oil generated by the hydraulic pump; and a driving unit including a motor for driving and rotating the rotary member of the hydraulic pump and a 2 nd rotary shaft rotated by the driving of the motor, the driving unit being attachable to and detachable from the tool unit, wherein a coupling portion is provided at a distal end of either the 1 st rotary shaft of the tool unit or the 2 nd rotary shaft of the driving unit, and a coupled portion for coupling to the coupling portion is provided at a distal end of the other of the 1 st rotary shaft of the tool unit and the 2 nd rotary shaft of the driving unit, the coupling portion includes a guide shaft rotatable integrally with the 1 st rotary shaft or the 2 nd rotary shaft and a plurality of engaging portions provided around the guide shaft, and the coupled portion includes a guide hole into which the guide shaft is inserted and engaged portions provided around the guide hole and with which the engaging portions are engaged.

In the hydraulic working device according to the present invention, the engagement portion may be a convex portion, and the engaged portion may be a concave portion into which the convex portion is fitted.

In this case, the tip of each of the convex portions may be inclined with respect to the longitudinal direction of the guide shaft and inclined with respect to a plane orthogonal to the longitudinal direction of the guide shaft.

Further, a convex portion may be provided between the concave portions, and a tip of each convex portion may be inclined with respect to the longitudinal direction of the guide hole and inclined with respect to a plane orthogonal to the longitudinal direction of the guide hole.

In the hydraulic working apparatus according to the present invention, the engaging portion may be a concave portion, and the engaged portion may be a convex portion fitted into the concave portion.

The hydraulic work apparatus according to the present invention may further include a torque transmission coupling for transmitting a rotational torque generated by the motor of the drive unit to the rotary member of the tool unit, the torque transmission coupling including: a rod-shaped shaft having flexibility; and a cover that covers an outer peripheral surface of the spindle, has flexibility, and transmits a rotational torque generated by the motor of the drive unit to the rotary member of the tool unit by rotating the spindle in the cover, wherein the torque transmission coupling can be bent due to the flexibility of the spindle and the cover, and a coupled portion that is coupled to the coupling portion provided at a distal end of one of the 1 st rotary shaft of the tool unit and the 2 nd rotary shaft of the drive unit and a coupled portion that is coupled to the coupled portion provided at a distal end of the other of the 1 st rotary shaft of the tool unit and the 2 nd rotary shaft of the drive unit are provided at both ends of the torque transmission coupling, respectively.

Drawings

Fig. 1 is a side view partially showing a cross-sectional view of a hydraulic work apparatus according to an embodiment of the present invention, in a state where a tool unit and a drive unit are separated from each other.

Fig. 2 is a side view partially in a sectional view showing a state in which the tool unit and the drive unit are coupled to each other in the hydraulic work apparatus shown in fig. 1.

Fig. 3 is a side view partially in section showing the details of the structure of the tool unit of the hydraulic work apparatus shown in fig. 1 and 2.

Fig. 4 is a top view of the tool unit shown in fig. 3.

Fig. 5 is a side view partially showing a sectional view of the drive unit of the hydraulic working apparatus shown in fig. 1 in detail.

Fig. 6 is a perspective view showing an example of the configuration of a portion to be connected provided on the mounted portion of the tool unit and a portion to be connected provided on the mounting portion of the driving unit in the hydraulic working apparatus shown in fig. 1.

Fig. 7 is a perspective view showing another example of the configuration of a portion to be connected provided on the mounted portion of the tool unit and a portion to be connected provided on the mounting portion of the driving unit in the hydraulic working apparatus shown in fig. 1.

Fig. 8 is a side view partially showing in cross section a state in which the tool unit and the drive unit are coupled to each other by the torque transmission coupling in the hydraulic working apparatus shown in fig. 1.

Fig. 9 is a side sectional view showing the details of the structure of the torque transmission coupling of the hydraulic working apparatus shown in fig. 8.

Detailed Description

Embodiments of the present invention are described below with reference to the drawings. The hydraulic working device of the present embodiment is used for rescue or the like, and can cut an object such as a reinforcing bar or pry open a door by using a tip tool such as a spreader. Fig. 1 to 9 are views showing a hydraulic working apparatus according to the present embodiment. Fig. 1 is a side view partially in cross section showing a state in which a tool unit and a drive unit are separated in the hydraulic power unit according to the present embodiment, and fig. 2 is a side view partially in cross section showing a state in which the tool unit and the drive unit are coupled in the hydraulic power unit shown in fig. 1. Fig. 3 is a side view partially showing in cross section the details of the structure of the tool unit of the hydraulic working apparatus shown in fig. 1 and 2, and fig. 4 is a plan view of the tool unit shown in fig. 3. Fig. 5 is a side view partially showing in cross section the configuration of the drive unit of the hydraulic working apparatus shown in fig. 1 in detail. Fig. 6 and 7 are perspective views showing various examples of the structures of the coupled portion provided on the attached portion of the tool unit and the coupling portion provided on the attached portion of the driving unit of the hydraulic working apparatus shown in fig. 1. Fig. 8 is a side view, partially in cross section, showing a state in which the tool unit and the drive unit are coupled to each other by the torque transmission coupling in the hydraulic working apparatus shown in fig. 1, and fig. 9 is a side cross section showing details of the structure of the torque transmission coupling of the hydraulic working apparatus shown in fig. 8.

As shown in fig. 1 and 2, the hydraulic working apparatus of the present embodiment includes: a tool unit 10 having a hydraulic pump 40 and a tool 30, the hydraulic pump 40 generating pressure oil by rotating a rotary member 41 (described later), the tool 30 being operated by the pressure oil generated by the hydraulic pump 40; and a drive unit 60 having a motor 62, wherein a rotational torque generated by the motor 62 of the drive unit 60 is transmitted to the rotary member 41 of the tool unit 10. As shown in fig. 1, in the hydraulic working apparatus according to the present embodiment, the tool unit 10 and the drive unit 60 can be separated from each other. The details of each component of such a hydraulic working apparatus will be described below.

First, the configuration of the tool unit 10 will be described in detail with reference to fig. 3 and 4. As shown in fig. 3, the tool unit 10 is configured by integrating a hydraulic pump 40 and a tool 30 such as a spreader, and the tool 30 such as the spreader is operated by pressure oil generated by the hydraulic pump 40. The tool 30 has a pair of cutters 32 that are opened and closed by pressure oil, and the cutter 32 can be opened in a state in which the tip end of the closed cutter 32 is inserted into a small gap in an object such as a door, thereby increasing the gap. Thus, for example, such a door can be pried open: the door blocks the space in which the rescuer is located and the door cannot be opened by conventional means. Further, since the small clearance can be forcibly expanded by the cutter 32 of the tool 30 under the action of the hydraulic pressure, the hydraulic power tool of the present embodiment can be used also for the purpose of lifting a heavy object. For example, it is possible to lift a thing by opening a cutter 32 in a state where the cutter 32 is placed on a firm table base and another cutter 32 is abutted against the lower surface of the thing to be lifted. The tool of the tool unit of the hydraulic power tool according to the present embodiment is not limited to the expander, and any tool other than the expander (for example, a cutter for cutting a steel bar or the like) may be used as the tool of the tool unit as long as the tool is operated by the pressure oil generated by the hydraulic pump.

As shown in fig. 3 and the like, the tool 30 has: a base part 31; a pair of cutters 32, each cutter 32 being rotatable about a shaft 32a with respect to the base portion 31; a pair of working members 34 for working the respective cutters 32; and a mounting member 36 mounted to a piston rod 38 described later. A shaft 34a is provided at a tip end portion of each of the working members 34, and each of the cutters 32 is attached to the shaft 34a so as to rotate about the shaft 34a with respect to each of the working members 34. Further, a shaft 34b is provided at a base end portion of each of the operating members 34, and each of the operating members 34 rotates about the shaft 34b with respect to the mounting member 36. When the mounting member 36 is pushed in the left direction of fig. 3 by the piston rod 38 from the state shown in fig. 3, the respective working members 34 are pushed in the left direction of fig. 3 by the mounting member 36, and the working members 34 are rotated in directions away from each other about the shaft 34b with respect to the mounting member 36. As a result, the respective cutters 32 provided to rotate about the shafts 34a with respect to the respective working members 34 are pushed by the respective working members 34 to rotate about the shafts 32a in directions away from each other. Thus, each cutter 32 is opened in the arrow direction from the state shown in fig. 3. On the other hand, when the piston rod 38 is slid in the right direction of fig. 3 with the cutters 32 opened and the attachment member 36 attached to the piston rod 38 is moved in the right direction of fig. 3, the respective working members 34 are pulled in the right direction of fig. 3 by the attachment member 36, and the cutters 32 are rotated around the shaft 32a in the direction in which they approach each other. Thereby, the respective cutters 32 are closed to be in a state shown in fig. 3.

As shown in fig. 3 and the like, the hydraulic pump 40 includes: an oil chamber 49; an eccentric portion 42 attached to a tip end of a rod-shaped rotating member 41 described later; and a piston 43 that moves up and down by the rotation of the eccentric portion 42. Here, the eccentric portion 42 is eccentric with respect to the axis of the rotary member 41, and a bearing such as a needle bearing is attached to the outer peripheral surface of the eccentric portion 42. The piston 43 is constantly pressed against the outer peripheral surface of the bearing by a spring, not shown. Therefore, when the rotary member 41 rotates, the eccentric portion 42 and the bearing perform eccentric rotation with respect to the axis of the rotary member 41, and thereby the piston 43 moves up and down, and the pressure oil is sent from the oil chamber 49 to the tool 30, whereby the tool 30 operates.

As shown in fig. 3 and the like, an oil passage 44 for feeding pressure oil from an oil chamber 49 of the hydraulic pump 40 to the tool 30 or returning return oil from the tool 30 to the oil chamber 49 is provided inside the tool unit 10. The oil passage 44 includes a 1 st oil passage 44a, a 2 nd oil passage 44b, a 3 rd oil passage 44c, and a 4 th oil passage 44d, and the 1 st oil passage 44a and the 2 nd oil passage 44b are defined by a core 48a of a switching valve 48. In addition, the 1 st oil passage 44a and the 3 rd oil passage 44c communicate with each other, and the 3 rd oil passage 44c and the 4 th oil passage 44d are also defined by the core 48a of the switching valve 48. An oil passage is also formed inside the core 48a of the switching valve 48, and when the core 48a is located at the position shown in fig. 3, the 3 rd oil passage 44c and the 4 th oil passage 44d communicate with each other via the oil passage formed inside the core 48 a. When the core 48a of the switching valve 48 is located at the position shown in fig. 3, the 1 st oil passage 44a and the 2 nd oil passage 44b are blocked by the core 48 a. On the other hand, when the operator rotates the switching valve 48 from the state shown in fig. 3 to rotate the core 48a by 90 °, the 1 st oil passage 44a and the 2 nd oil passage 44b communicate with each other via the oil passage formed in the core 48 a. In this case, the 3 rd oil passage 44c and the 4 th oil passage 44d are blocked by the core 48a of the switching valve 48.

As shown in fig. 3 and the like, a 2 nd oil chamber 46 is provided outside the piston rod 38, and the 2 nd oil chamber 46 communicates with a 4 th oil passage 44d via a 5 th oil passage 44 e.

As shown in fig. 3 and the like, a return oil passage 44f is provided for returning the return oil from the tool 30 to the oil chamber 49 of the hydraulic pump 40. Here, the 2 nd oil passage 44b and the return oil passage 44f are defined by a core 48a of the switching valve 48, and when the core 48a is located at the position shown in fig. 3, the 2 nd oil passage 44b and the return oil passage 44f are communicated with each other by an oil passage formed inside the core 48 a. The 4 th oil passage 44d and the return oil passage 44f are also defined by the core 48a of the switching valve 48, and when the operator rotates the switching valve 48 to rotate the core 48a by 90 ° from the state shown in fig. 3, the 4 th oil passage 44d and the return oil passage 44f communicate with each other via an oil passage formed inside the core 48 a.

As shown in fig. 3, a 1 st oil chamber 45 is provided inside the piston rod 38, and the 1 st oil chamber 45 communicates with a 2 nd oil passage 44b. More specifically, a flange 47 is provided at a base end portion of the piston rod 38, and the pressure oil fed from the 2 nd oil passage 44b to the tool 30 enters a region on the right side of the flange 47 and also enters the 1 st oil chamber 45 provided inside the piston rod 38. Therefore, when the hydraulic pump 40 is operated after the core 48a of the switching valve 48 has rotated 90 ° from the state shown in fig. 3, and the pressure oil is sent from the 2 nd oil passage 44b to the 1 st oil chamber 45 and the region on the right side of the flange 47, the flange 47 and the piston rod 38 are pushed in the left direction in fig. 3 and 4. Thus, when the piston rod 38 is pushed in the left direction in fig. 3 and 4, the pair of cutters 32 of the tool 30 are opened in the arrow direction in fig. 3. At this time, the return oil is returned from the 2 nd oil chamber 46 to the oil chamber 49 of the hydraulic pump 40 through the 5 th oil passage 44e, the 4 th oil passage 44d, and the return oil passage 44f in this order.

Further, as described above, the 2 nd oil chamber 46 is provided outside the piston rod 38, and the 2 nd oil chamber 46 communicates with the 4 th oil passage 44d via the 5 th oil passage 44 e. Therefore, when the hydraulic pump 40 is operated when the core 48a of the switching valve 48 is located at the position shown in fig. 3, the pressure oil is sequentially sent to the 2 nd oil chamber 46 through the 3 rd oil passage 44c, the 4 th oil passage 44d, and the 5 th oil passage 44e, and the flange 47 is pushed in the right direction in fig. 3 and 4, whereby the piston rod 38 is also pushed in the right direction in fig. 3 and 4. When the piston rod 38 is thus pushed in the right direction in fig. 3, 4, the pair of cutters 32 of the tool 30 is closed. At this time, the return oil is returned from the 1 st oil chamber 45 to the oil chamber 49 of the hydraulic pump 40 through the 2 nd oil passage 44b and the return oil passage 44f in this order.

Further, a mounted portion 50 for mounting a driving unit 60, which will be described later, is provided at a base end portion of the tool unit 10. The structure of the attached portion 50 will be described in detail later.

Next, the configuration of the driving unit 60 will be described in detail with reference to fig. 5. As shown in fig. 5, a motor 62 such as an electric motor is provided inside the drive unit 60, and a rotary shaft 62a attached to the motor 62 is rotated by the motor 62. The drive unit 60 is provided with a grip portion 65 to be gripped by a hand of an operator, and the grip portion 65 is provided with a switch 66 that can be operated by a finger of the operator gripping the grip portion 65. Such a switch 66 functions as an operation unit for operating the motor 62. A battery 64 formed of a secondary battery such as a lithium ion battery or a nickel metal hydride battery is provided at a lower end portion of the drive unit 60, and when the operator operates a switch 66, electric power is supplied from the battery 64 to the motor 62. Further, a mounting portion 67 for mounting to the mounted portion 50 of the tool unit 10 is provided at the tip end portion of the driving unit 60. The structure of the mounting portion 67 will be described in detail later.

Next, the structure of the mounted portion 50 of the tool unit 10 and the mounting portion 67 of the driving unit 60 will be described in detail with reference to fig. 3 to 6. Fig. 6 is a perspective view showing an example of the configuration of the coupled portion 52 provided in the mounted portion 50 of the tool unit 10 and the coupling portion 68 provided in the mounting portion 67 of the driving unit 60 in the hydraulic operation device shown in fig. 1.

As shown in fig. 3, 6, and the like, a cylindrical coupled portion 52 for coupling to a coupling portion 68 of the driving unit 60 is attached to a proximal end portion of the rotary member 41 of the tool unit 10, and the coupling portion 68 of the driving unit 60 is attached to a distal end portion of a rotary shaft 62a that rotates under the drive of the motor 62. As shown in fig. 6, the coupling portion 68 has a cylindrical guide shaft 68a that rotates integrally with the rotation shaft 62a, and a plurality of (e.g., 12) convex engaging portions 68b (convex portions) provided around the guide shaft 68 a. Here, the engaging portions 68b are arranged along the outer peripheral surface of the guide shaft 68 a. Each engaging portion 68b is a sharp engaging portion having a tapered tip. That is, the tip of each engaging portion 68b is inclined with respect to the longitudinal direction of the guide shaft 68a, and is inclined with respect to a plane orthogonal to the longitudinal direction of the guide shaft 68 a. On the other hand, the connected portion 52 has a guide hole 52a into which the guide shaft 68a is inserted, and a plurality of (for example, 12) engaged portions 52b (concave portions) provided around the guide hole 52a and with which the respective engaging portions 68b are engaged. Here, as shown in fig. 6, the engaged portions 52b of the coupled portion 52 are arranged along the outer peripheral edge of the guide hole 52a, and the engaged portions 52b are adjacent to each other. The number of the engaging portions 68b may be the same as the number of the engaged portions 52b, or the number of the engaging portions 68b may be smaller than the number of the engaged portions 52b. For example, the number of the engaged portions 52b may be 12, and the number of the engaging portions 68b may be 6. However, in the case where the number of the engaging portions 68b is large, even when one of the engaging portions 68b is broken and separated from the coupling portion 68, the coupling between the coupling portion 68 and the coupled portion 52 can be maintained by engaging the other engaging portions 68b with the coupled portion 52b.

Further, the outer peripheral edge of each engaged portion 52b (recess) on the distal end surface of the coupled portion 52 is chamfered at about 45 ° relative to the distal end surface of the coupled portion 52. With the coupling portion 68 and the coupled portion 52 having such a configuration, when the guide shaft 68a is inserted into the guide hole 52a and then the guide shaft 68a is pushed toward the back side of the guide hole 52a when the coupling portion 68 is coupled to the coupled portion 52, the engaging portions 68b are inserted into the engaged portions 52b. Further, with the engaging portions 68b and the engaged portions 52b having the above-described shapes, even when the positions of the engaging portions 68b are displaced with respect to the engaged portions 52b when the guide shaft 68a is pushed toward the back side of the guide hole 52a, when the tapered surfaces provided at the distal ends of the engaging portions 68b come into contact with the outer peripheral edges of the engaged portions 52b, the coupling portion 68 rotates with respect to the engaged portion 52, thereby correcting the displacement of the engaging portions 68b with respect to the engaged portions 52b. Therefore, when the guide shaft 68a is pushed into the guide hole 52a, the engaging portions 68b are completely inserted into the engaged portions 52b. When the engaging portions 68b are completely inserted into the engaged portions 52b, the rotating shaft 62a of the driving unit 60 and the rotating member 41 of the tool unit 10 rotate integrally, and therefore the rotational torque generated by the motor 62 of the driving unit 60 is reliably transmitted to the rotating member 41 of the tool unit 10.

As described above, with the configurations of the mounted portion 50 of the tool unit 10 and the mounting portion 67 of the driving unit 60 as shown in fig. 3 to 6, regardless of the rotational phase of the connecting portion 68 relative to the connected portion 52, when the guide shaft 68a of the connecting portion 68 is inserted into the guide hole 52a of the connected portion 52, the engaging portions 68b of the connecting portion 68 can be engaged with the engaged portions 52b of the connected portion 52. In general, the rotary shafts must be connected to each other so as to be capable of transmitting power by a structure such as a key or a key groove that prohibits relative rotation of the rotary shafts, and therefore, an operation of matching the rotational phases of the rotary shafts is required. In contrast, in the hydraulic working apparatus according to the present embodiment, the coupling portion 68 and the coupled portion 52 having the above-described shapes are used, so that the operation of aligning the rotational phases is not required. Therefore, the operation of connecting the driving unit 60 to the tool unit 10 can be greatly simplified.

In order to maintain the state in which the coupling portion 68 of the driving unit 60 is coupled to the coupled portion 52 of the tool unit 10, the hydraulic working apparatus of the present embodiment is provided with a lock mechanism for fixing the tool unit 10 and the driving unit 60 in the axial direction of the rotary member 41 and the rotary shaft 62 a. Hereinafter, such a lock mechanism will be described.

As shown in fig. 5, in the mounting portion 67 of the drive unit 60, a 1 st ring member 69a provided at a distance from the coupling portion 68 is disposed around the coupling portion 68. Further, a 2 nd ring member 69b is disposed around the 1 st ring member 69a. A 3 rd ring member 69c is disposed around the 2 nd ring member 69b. Here, the 2 nd ring member 69b is fixed so as to be immovable with respect to the mounting portion 67, whereas the 1 st and 3 rd ring members 69a and 69c are respectively slidable in the axial direction of the rotating shaft 62a with respect to the 2 nd ring member 69b.

More specifically, as shown in fig. 5, the 1 st ring member 69a is slidable in the axial direction of the rotating shaft 62a inside the 2 nd ring member 69b. The 1 st ring member 69a is biased leftward in fig. 5 by a spring. Further, a bolt 69d is attached to the 2 nd ring member 69b, and displacement of the 1 st ring member 69a in the left direction in fig. 5 is restricted by a tip portion of the bolt 69 d.

The 3 rd ring member 69c is slidable along the outer peripheral surface of the 2 nd ring member 69b in the axial direction of the rotary shaft 62 a. The 3 rd ring member 69c is biased leftward in fig. 5 by a spring. Further, a stopper is provided on the outer peripheral surface of the 2 nd ring member 69b, and displacement of the 3 rd ring member 69c in the left direction of fig. 5 is restricted by the stopper. Further, a flange 69e for allowing the operator to slide the 3 rd ring member 69c is provided on the outer peripheral surface of the 3 rd ring member 69c.

In addition, in the 2 nd ring member 69b, a plurality of holes are formed at intervals along the circumferential direction, and a pin 69f having an oblong cross section is housed inside each hole. When the guide shaft 68a provided in the coupling portion 68 of the driving unit 60 is inserted into the guide hole 52a provided in the coupled portion 52 of the tool unit 10 from the state where the tool unit 10 and the driving unit 60 are separated, the 1 st ring member 69a is press-fitted in the right direction of fig. 5 by the press-fitting member 51 provided in the mounted portion 50 of the tool unit 10. Then, when the pin 69f coincides with the position of the dimple 51a formed in the surface of the press-in member 51, the pin 69f is pressed into the dimple 51 a. The inclined surface at the tip end portion of the 3 rd ring member 69c urged in the leftward direction of fig. 5 by the spring presses the pin 69f, thereby generating a force to press the pin 69f into the recess 51 a. Further, the inclined surface passes over the pin 69f after the pin 69f is pushed into the recess 51a, and collides with the stopper. In this manner, the pin 69f is inserted into the recess 51a, and the tool unit 10 and the drive unit 60 are fixed along the axial direction of the rotary member 41 and the rotary shaft 62 a.

To shift from the coupled state shown in fig. 2 to the separated state shown in fig. 1, the flange 69e of the 3 rd ring member 69c is gripped, and the 3 rd ring member 69c is moved in the right direction of fig. 5 against the force of the spring. Then, the pin 69f is in a state of being able to be pulled out from the recess 51 a. At the same time, the 1 st ring member 69a pushes out the press-fitting member 51 provided on the attached portion 50 of the tool unit 10 in the leftward direction of fig. 5 from the 2 nd ring member 69b by the force of the spring. At the same time, the inclined surface as the inner surface of the recess 51a pushes the pin 69f outward. Thereby, the guide shaft 68a provided in the coupling portion 68 of the driving unit 60 is pulled out from the guide hole 52a provided in the coupled portion 52 of the tool unit 10, and is brought into a separated state shown in fig. 1.

The hydraulic operating device according to the present embodiment is not limited to the above-described embodiment, and various modifications can be made.

For example, instead of the coupling portion having the guide shaft and the plurality of engaging portions provided around the guide shaft being attached to the distal end of the rotating shaft of the driving unit, the coupled portion having the guide hole and the plurality of engaged portions provided around the guide hole may be attached to the distal end of the rotating shaft of the driving unit. In this case, a coupling portion having a guide shaft and a plurality of engaging portions provided around the guide shaft is attached to a base end portion of the rotary member of the tool unit.

Instead of the coupling portion 68 and the coupled portion 52 having the shapes shown in fig. 6, a coupling portion including a guide shaft and an engaged portion including a plurality of recesses provided around the guide shaft, and a coupled portion including a guide hole and an engaging portion including a plurality of protrusions provided around the guide hole may be used.

In the hydraulic operating device according to the modified example, instead of the coupling portion 68 and the coupled portion 52 having the shapes shown in fig. 6, a coupling portion 68m and a coupled portion 52m having the shapes shown in fig. 7 may be used.

More specifically, in the hydraulic power unit according to the modification, a cylindrical coupled portion 52m for coupling with a coupling portion 68m of the driving unit 60 is attached to a base end portion of the rotary member 41 of the tool unit 10, and the coupling portion 68m of the driving unit 60 is attached to a tip end portion of the rotary shaft 62a that is rotated by the motor 62. As shown in fig. 7, the coupling portion 68m includes a cylindrical guide shaft 68a that rotates integrally with the rotation shaft 62a, and a plurality of (e.g., 6) convex engaging portions 68p (convex portions) provided around the guide shaft 68 a. Here, the engaging portions 68p are arranged along the outer peripheral surface of the guide shaft 68 a. Each engaging portion 68p is a pointed engaging portion having a narrow tip end such as a mountain shape. That is, the tip of each engaging portion 68p is inclined with respect to the longitudinal direction of the guide shaft 68a, and is inclined with respect to a plane orthogonal to the longitudinal direction of the guide shaft 68 a. Further, a recess 68q is formed between the engaging portions 68p. On the other hand, the coupled portion 52m has a guide hole 52a into which the guide shaft 68a is inserted, and a plurality of (for example, 6) engaged portions 52q (concave portions) provided around the guide hole 52a and with which the respective engaging portions 68p are engaged. Here, as shown in fig. 6, the engaged portions 52q of the coupled portion 52 are arranged along the outer peripheral edge of the guide hole 52 a. Further, a convex portion 52p is formed between the engaged portions 52q. Each convex portion 52p is a sharp engaging portion having a narrow tip end such as a mountain shape. That is, the tip of each projection 52p is inclined with respect to the longitudinal direction of the rotary member 41 and is inclined with respect to a plane orthogonal to the longitudinal direction of the rotary member 41. The number of the engaging portions 68p may be the same as the number of the engaged portions 52q, or the number of the engaging portions 68p may be smaller than the number of the engaged portions 52q. For example, the number of the engaged portions 52q may be 6, and the number of the engaging portions 68p may be 3. However, in the case where the number of the engaging portions 68p is large, even when a certain engaging portion 68p is broken and separated from the coupling portion 68m, the coupling portion 68m and the coupled portion 52m can be maintained to be coupled by engaging the other engaging portion 68p with the coupled portion 52q.

With the coupling portion 68m and the coupled portion 52m having such a configuration, when the guide shaft 68a is inserted into the guide hole 52a and then the guide shaft 68a is pushed toward the back side of the guide hole 52a in order to couple the coupling portion 68 to the coupled portion 52, the engaging portions 68p are fitted to the engaged portions 52q. Further, even when the position of each engaging portion 68p is shifted with respect to each engaged portion 52q when the guide shaft 68a is pushed toward the back side of the guide hole 52a, the coupling portion 68m rotates with respect to the coupled portion 52m to correct the positional shift of each engaging portion 68p with respect to each engaged portion 52q when the peak of the peak shape of each engaging portion 68b comes into contact with the peak of the peak shape of each protruding portion 52p, by virtue of the engaging portions 68p and the engaged portions 52q having the above-described shapes. Therefore, when the guide shaft 68a is pushed into the back surface of the guide hole 52a, the engaging portions 68p are completely fitted into the engaged portions 52q. When the engaging portions 68p are completely fitted into the engaged portions 52q, the rotary shaft 62a of the driving unit 60 and the rotary member 41 of the tool unit 10 rotate integrally, and therefore the rotational torque generated by the motor 62 of the driving unit 60 is reliably transmitted to the rotary member 41 of the tool unit 10.

As described above, with the configuration of the coupling portion 68m and the coupled portion 52m as shown in fig. 7, regardless of the rotational phase of the coupling portion 68m relative to the coupled portion 52m, when the guide shaft 68a of the coupling portion 68m is inserted into the guide hole 52a of the coupled portion 52m, the engaging portions 68p of the coupling portion 68m can be engaged with the engaged portions 52q of the coupled portion 52m. In general, the rotary shafts must be connected to each other so as to be capable of transmitting power by a structure such as a key or a key groove that prohibits relative rotation of the rotary shafts, and therefore, an operation of matching the rotational phases of the rotary shafts is required. In contrast, in the hydraulic working apparatus according to the present embodiment, by using the coupling portion 68m and the coupled portion 52m having the above-described shapes, the operation of aligning the rotational phases is not necessary. Therefore, the operation of connecting the driving unit 60 to the tool unit 10 can be greatly simplified.

In the hydraulic working apparatus according to the present embodiment, the tool unit 10 and the drive unit 60 can be coupled via the flexible torque transmission coupling 70, instead of directly coupling the tool unit 10 and the drive unit 60. Fig. 8 is a side view, partially in a sectional view, showing a state in which the tool unit 10 and the drive unit 60 are coupled to each other by the torque transmission coupling 70 in the hydraulic operating device shown in fig. 1, and fig. 9 is a side sectional view showing details of the configuration of the torque transmission coupling 70 of the hydraulic operating device shown in fig. 8. The details of the structure of the torque transmission coupling 70 will be described below.

As shown in fig. 8 and 9, the torque transmission coupling 70 includes: a rod-shaped shaft 74 having flexibility; and a flexible cover 72 covering the outer peripheral surface of the shaft 74. Here, the rod-like shaft 74 is formed by alternately winding a plurality of layers of, for example, special hard steel wires in the right direction and in the left direction, and has flexibility for transmitting rotational torque. The rod-shaped stem 74 is not limited to such a configuration, and may be made of other metal materials such as stainless steel. The rod-shaped stem 74 may be made of a material other than a metal material. Further, the shaft 74 and the protective cover 72 have flexibility, and therefore the torque transmission coupling 70 can be bent. Further, an attachment portion 80 is provided at one end of the protective cover 72 of the torque transmission coupler 70, and the attachment portion 80 is detachably attached to the attached portion 50 provided at the base end portion of the tool unit 10. Further, a mounted portion 90 is provided at the other end of the protective cover 72, and the mounted portion 90 is detachably mounted to a mounting portion 67 provided at the tip end portion of the drive unit 60.

As shown in fig. 9, a rotating member 81 is connected to an end of a rod-like stem 74 in a mounting portion 80 of the torque transmission coupler 70, and a coupling portion 82 is attached to a tip portion 81a of the rotating member 81. More specifically, an opening is provided at a base end portion of the mounting portion 80, and the protective cover 72 is inserted into the opening. The protective cover 72 inserted into the opening of the mounting portion 80 is fixed inside the opening of the mounting portion 80 by a plurality of (e.g., two) screws 88. Further, a hole is provided in a base end portion of the rotary member 81, and a tip end of the rod-like stem 74 is inserted into the hole. In addition, the shaft 74 inserted into the hole of the rotating member 81 is fixed inside the hole of the rotating member 81 by a plurality of (e.g., four) screws 81 b. In the present embodiment, the torque transmission coupling 70 can be attached to and detached from the tool unit 10 along the axial direction of the spindle 74 by the attachment portion 80.

Here, the structure of the coupling portion 82 provided in the mounting portion 80 of the torque transmission coupler 70 is substantially the same as the structure of the coupling portion 68 provided in the mounting portion 67 of the drive unit 60. Specifically, the coupling portion 82 includes a cylindrical guide shaft 82a that rotates integrally with the rotating member 81, and a plurality of (e.g., 12) convex engaging portions 82b (convex portions) provided around the guide shaft 82 a. Here, each engaging portion 82b is a sharp engaging portion having a tapered tip. That is, the tip of each engaging portion 82b is inclined with respect to the longitudinal direction of the guide shaft 82a, and is inclined with respect to a plane orthogonal to the longitudinal direction of the guide shaft 82 a. The guide shaft 82a of the coupling portion 82 is inserted into the guide hole 52a of the coupled portion 52, and the engaging portions 82b of the coupling portion 82 engage with the engaged portions 52b of the coupled portion 52, so that the coupling portion 82 is coupled to the coupled portion 52. With the coupling portion 82 and the coupled portion 52 having such a configuration, when the guide shaft 82a is inserted into the guide hole 52a and then the guide shaft 82a is pushed toward the back side of the guide hole 52a in order to couple the coupling portion 82 to the coupled portion 52, the engaging portions 82b are inserted into the engaged portions 52b. Further, with the engaging portions 82b and the engaged portions 52b having the above-described shapes, even when the positions of the engaging portions 82b are displaced with respect to the engaged portions 52b when the guide shaft 82a is pushed into the guide hole 52a, when the tapered surfaces provided at the distal ends of the engaging portions 82b come into contact with the outer peripheral edges of the engaged portions 52b, the coupling portion 82 rotates with respect to the engaged portion 52 to correct the displacement of the engaging portions 82b with respect to the engaged portions 52b. Therefore, when the guide shaft 82a is pushed into the guide hole 52a, the engaging portions 82b are completely inserted into the engaged portions 52b. When the engaging portions 82b are completely inserted into the engaged portions 52b, the rotating member 81 of the torque transmission coupling 70 and the rotating member 41 of the tool unit 10 rotate integrally, and the rotating torque is transmitted from the rotating member 81 of the torque transmission coupling 70 to the rotating member 41 of the tool unit 10.

In order to maintain the state in which the coupling portion 82 of the torque transmission coupling 70 is coupled to the portion 52 to be coupled of the tool unit 10, the hydraulic operating device of the present embodiment is provided with a lock mechanism for fixing the tool unit 10 and the torque transmission coupling 70 in the axial direction of the rotary member 41 and the rotary member 81. Here, such a lock mechanism is substantially the same as the lock mechanism for fixing the tool unit 10 and the drive unit 60.

Specifically, the 1 st ring member 83 provided at a distance from the coupling portion 82 is disposed around the coupling portion 82 in the mounting portion 80 of the torque transmission coupling 70. Further, a 2 nd ring member 84 is disposed around the 1 st ring member 83. Further, a 3 rd ring member 85 is disposed around the 2 nd ring member 84. Here, the 2 nd ring member 84 is fixed so as to be immovable with respect to the mounting portion 80, whereas the 1 st ring member 83 and the 3 rd ring member 85 are respectively slidable in the axial direction of the rotary member 81 with respect to the 2 nd ring member 84.

More specifically, as shown in fig. 9, the 1 st ring member 83 is slidable in the 2 nd ring member 84 along the axial direction of the rotating member 81. The 1 st ring member 83 is biased leftward in fig. 9 by a spring. Further, a bolt 86 is attached to the 2 nd ring member 84, and displacement of the 1 st ring member 83 in the left direction of fig. 9 is restricted by the tip portion of the bolt 86.

The 3 rd ring member 85 is slidable along the outer peripheral surface of the 2 nd ring member 84 in the axial direction of the rotating member 81. The 3 rd ring member 85 is biased leftward in fig. 9 by a spring. Further, a stopper is provided on the outer peripheral surface of the 2 nd ring member 84, and displacement of the 3 rd ring member 85 in the left direction in fig. 9 is restricted by the stopper. Further, a flange 85a for allowing the operator to slide the 3 rd ring member 85 is provided on the outer peripheral surface of the 3 rd ring member 85.

In the 2 nd ring member 84, a plurality of holes are formed at intervals in the circumferential direction, and a pin 84a having an oblong cross section is housed inside each hole. Then, when the guide shaft 82a of the coupling portion 82 of the torque transmission coupling 70 is gradually inserted into the guide hole 52a of the coupled portion 52 of the tool unit 10 from the state in which the tool unit 10 and the torque transmission coupling 70 are separated, the 1 st ring member 83 is pushed in the right direction of fig. 9 by the pushing member 51 provided in the mounted portion 50 of the tool unit 10. Then, when the pin 84a coincides with the position of the recess 51a formed in the surface of the press-in member 51, the pin 84a is pressed into the recess 51 a. The inclined surface at the tip end portion of the 3 rd ring member 85 biased in the left direction of fig. 9 by the spring presses the pin 84a, thereby generating a force to press the pin 84a into the recess 51 a. Further, the inclined surface passes over the pin 84a after the pin 84a is pressed into the recess 51a, and collides with the stopper. Fig. 8 shows a state after the torque transmission coupling 70 has finished the coupling operation with respect to the tool unit 10. As a result, the pin 84a is inserted into the recess 51a, and the tool unit 10 and the torque transmission coupling 70 are fixed in the axial direction of the rotary member 41 and the rotary member 81.

To shift the tool unit 10 and the torque transmission coupling 70 from the coupled state to the decoupled state, the flange 85a of the 3 rd ring member 85 is gripped, and the 3 rd ring member 85 is moved in the right direction of fig. 9 against the force of the spring. Then, the pin 84a is in a state of being able to be pulled out from the recess 51 a. At the same time, the 1 st ring member 83 pushes out the press-fitting member 51 provided on the attached portion 50 of the tool unit 10 in the leftward direction of fig. 8 from the 2 nd ring member 84 by the force of the spring. At the same time, the inclined surface as the inner surface of the recess 51a pushes the pin 84a outward. Thereby, the guide shaft 82a of the coupling portion 82 of the torque transmission coupling 70 is pulled out from the guide hole 52a of the coupled portion 52 of the tool unit 10, and the tool unit 10 and the torque transmission coupling 70 are separated from each other.

In the hydraulic operating device of the present embodiment, the attached portion 90 provided at the other end of the shaft 74 of the torque transmission coupling 70 has substantially the same configuration as the attached portion 50 of the tool unit 10. Specifically, as shown in fig. 8 and 9, the rotating member 91 is attached to the shaft 74 of the attached portion 90 of the torque transmission coupling 70, and a cylindrical attached portion 94 for connection to the connecting portion 68 of the driving unit 60 is attached to the tip end portion of the rotating member 91. Specifically, the coupled part 94 includes a guide hole into which the guide shaft 68a of the coupling part 68 is inserted, and a plurality of (for example, 12) engaged parts (concave parts) provided around the guide hole and with which the respective engaging parts 68b are engaged.

In order to maintain the state in which the coupling portion 68 of the drive unit 60 is coupled to the coupled portion 94 of the torque transmission coupling 70, the hydraulic operating device of the present embodiment is provided with a lock mechanism for fixing the drive unit 60 and the torque transmission coupling 70 along the axial direction of the rotary shaft 62a and the rotary member 91. Here, such a lock mechanism is substantially the same as the lock mechanism for fixing the tool unit 10 and the drive unit 60. That is, the press-fitting member 92 is provided on the attached portion 90 of the torque transmission coupling 70, and the press-fitting member 92 has substantially the same structure as the press-fitting member 51 provided on the attached portion 50 of the tool unit 10. As described above, the ring members 69a, 69b, and 69c are provided on the mounting portion 67 of the drive unit 60, and the ring members 69a, 69b, and 69c have substantially the same configuration as the ring members 83, 84, and 85 provided on the mounting portion 80 of the torque transmission coupling 70. This allows the drive unit 60 and the torque transmission coupling 70 to be fixed along the axial direction of the rotary shaft 62a and the rotary member 91.

Next, the operation of the hydraulic working apparatus according to the present embodiment will be described. In the following description, an example using the coupling portion 68 and the coupled portion 52 shown in fig. 6 is described, but the same operation is performed when the coupling portion 68m and the coupled portion 52m shown in fig. 7 are used.

First, the operator who wants to use the hydraulic working apparatus of the present embodiment carries the tool unit 10, the drive unit 60, and the torque transmission coupling 70 to the rescue site in a state where these units are separated from each other. In addition, when the torque transmission coupling 70 is not used, the tool unit 10 and the driving unit 60 may be carried only to the rescue site. Then, at the site, the operator first inserts the tip end portions of the respective cutters 32 of the tool 30 of the tool unit 10 into a small gap of an object such as a door. Next, the operator connects the connection portion 68 provided in the attachment portion 67 of the drive unit 60 to the connected portion 52 provided in the mounted portion 50 of the tool unit 10. The tool unit 10 and the drive unit 60 may be directly coupled as shown in fig. 1 to 7, or the tool unit 10 and the drive unit 60 may be coupled via a torque transmission coupling 70 as shown in fig. 8 and 9.

After the tool unit 10 and the drive unit 60 are coupled in this manner, the switching valve 48 is rotated by 90 ° from the state of the core 48a shown in fig. 3. When the worker grips the grip portion 65 of the driving unit 60 and operates the switch 66 with his or her finger, the motor 62 is operated, and the rotating shaft 62a is rotated by the motor 62. Further, since the coupling portion 68 attached to the tip end portion of the rotary shaft 62a of the driving unit 60 is coupled to the coupled portion 52 of the tool unit 10, the rotary member 41 of the tool unit 10 also rotates in synchronization with the rotary shaft 62 a. In the case where the tool unit 10 and the driving unit 60 are coupled to each other by the torque transmission coupling 70 as shown in fig. 8 and 9, when the rotating shaft 62a of the driving unit 60 rotates, the rod-shaped shaft 74 and the rotating members 81 and 91 of the torque transmission coupling 70 also rotate in the same direction. Since the coupling portion 82 attached to the tip end portion of the rotating member 81 of the torque transmission coupling 70 is coupled to the coupled portion 52 of the tool unit 10, when the rotating member 81 of the torque transmission coupling 70 rotates, the rotating member 41 of the tool unit 10 also rotates in the same direction.

In the tool unit 10, when the rotary member 41 rotates, the eccentric portion 42 and the bearing attached to the distal end of the rotary member 41 perform eccentric rotation with respect to the axis of the rotary member 41, and thereby the piston 43 moves up and down, and the pressure oil is sent from the oil chamber 49 to the 1 st oil chamber 45, so that the tool 30 operates. Specifically, the piston rod 38 is pushed in the left direction in fig. 3 and 4, and the pair of cutters 32 are opened in the arrow direction in fig. 3.

At the rescue site or the like, when the use of the hydraulic working apparatus of the present embodiment is completed, the operator rotates the switching valve 48 by 90 ° to return the core 48a to the state shown in fig. 3. Thereafter, when the worker grips the grip portion 65 of the driving unit 60 and operates the switch 66 with his/her finger, the motor 62 is operated, and the rotary member 41 of the tool unit 10 is also rotated. When the rotary member 41 rotates in this way, the eccentric portion 42 and the bearing perform eccentric rotation with respect to the axis of the rotary member 41, and thereby the piston 43 moves up and down, and pressure oil is sent from the oil chamber 49 to the 2 nd oil chamber 46. Thereby, the pair of cutters 32 are closed by the piston rod 38 being pushed in the right direction in fig. 3 and 4. Thereafter, the operator removes the torque transmission coupling 70 and the driving unit 60 from the tool unit 10. In this way, each unit of the hydraulic working apparatus after use can be transported in a state where each unit is separated from another unit.

According to the hydraulic working apparatus of the present embodiment configured as described above, the coupling portions 68, 68m are provided at the distal end of either the rotary member 41 (the 1 st rotary shaft) of the tool unit 10 or the rotary shaft 62a (the 2 nd rotary shaft) of the drive unit 60, and the coupled portions 52, 52m for coupling to the coupling portions 68, 68m are provided at the distal end of the other. The coupling portions 68, 68m have a guide shaft 68a that rotates integrally with the rotary member 41 or the rotary shaft 62a, and a plurality of engaging portions 68b, 68p provided around the guide shaft 68 a. The coupled portions 52, 52m have a guide hole 52a into which the guide shaft 68a is inserted, and engaged portions 52b, 52q provided around the guide hole 52a and with which the engaging portions 68b, 68p are engaged. With such a hydraulic operating device, regardless of the rotational phase of the connecting portions 68, 68m relative to the coupled portions 52, 52m, when the guide shafts 68a of the connecting portions 68, 68m are inserted into the guide holes 52a of the coupled portions 52, 52m, the engaging portions 68b, 68p of the connecting portions 68, 68m can be engaged with the engaged portions 52b, 52q of the coupled portions 52, 52m. In general, the rotary shafts must be coupled to each other so as to be capable of transmitting power by a structure such as a key or a key groove that prohibits relative rotation of the rotary shafts, and therefore, an operation of aligning the rotational phases of the rotary shafts is required. In contrast, in the hydraulic working apparatus according to the present embodiment, by using the coupling portions 68 and 68m and the coupled portions 52 and 52m having the above-described shapes, the operation of aligning the rotational phases is not necessary. Therefore, the operation of coupling the driving unit 60 to the tool unit 10 can be greatly simplified.

In the hydraulic working apparatus of the present embodiment, as described above, the engaging portions 68b and 68p are convex portions, and the engaged portions 52b and 52q are concave portions into which the convex portions are fitted. In the hydraulic operating device according to the present embodiment, the hydraulic operating device is not limited to this example, and a plurality of engaging portions each formed of a concave portion may be disposed around the guide shaft of the connecting portion, and a plurality of engaged portions each formed of a convex portion may be disposed around the guide hole of the connected portion.

In the hydraulic operating device of the present embodiment, as described above, the tip of each convex portion serving as each engaging portion 68b, 68p is inclined with respect to the longitudinal direction of the guide shaft 68a and is inclined with respect to the plane orthogonal to the longitudinal direction of the guide shaft 68 a. This makes it possible to more easily perform the operation of rotational phase alignment. The convex portions 52p between the concave portions serving as the engaged portions 52q are inclined with respect to the longitudinal direction of the guide hole 52a and inclined with respect to a plane orthogonal to the longitudinal direction of the guide hole 52 a. In this case, too, the operation of rotational phase alignment can be performed more easily.

In the hydraulic working apparatus according to the present embodiment, as described above, the torque transmission coupling 70 is provided such that one end of the torque transmission coupling 70 is detachable from the tool unit 10 and the other end is detachable from the drive unit 60, and the torque transmission coupling 70 transmits the rotational torque generated by the motor 62 of the drive unit 60 to the rotary member 41 of the tool unit 10. The torque transmission coupling 70 includes: a rod-shaped shaft 74 having flexibility; and a protective cover 72 that covers an outer peripheral surface of the shaft 74 and has flexibility, and the shaft 74 rotates within the protective cover 72 so that the rotational torque generated by the motor 62 of the drive unit 60 is transmitted to the rotary member 41 of the tool unit 10. Further, a coupled portion 94 and a coupling portion 82 are provided at both ends of the torque transmission coupling 70, respectively, the coupled portion 94 being coupled to the coupling portion 68 provided at the distal end of either one of the rotary member 41 of the tool unit 10 and the rotary shaft 62a of the drive unit 60, and the coupling portion 82 being coupled to the coupled portion 52 provided at the distal end of the other one of the rotary member 41 of the tool unit 10 and the rotary shaft 62a of the drive unit 60. With such a hydraulic working apparatus, the torque transmission coupling 70 can be bent because the rod 74 and the protector 72 are flexible. Therefore, the tool unit 10 can be installed only in a narrow place or a place where a secondary disaster may occur in a rescue or the like, and the driving unit 60 can be installed in a place away from the narrow place or the place where the secondary disaster may occur by the bending torque transmission coupling 70, so that the tool unit 10 can be remotely operated by the torque transmission coupling 70 in the place away from the tool unit 10.

The hydraulic working apparatus according to the present invention is not limited to the above-described embodiment, and various modifications may be made.

For example, the pump provided in the tool unit 10 is not limited to the illustrated pump. In the hydraulic working apparatus of the present invention, any type of pump configured to feed pressure oil by driving and rotating a certain structural member of the pump can be assembled to the tool unit 10.

The coupling between the tool unit 10 and the drive unit 60 and the coupling between the tool unit 10 and the torque transmission coupling 70 are not limited to the configuration in which the guide shaft of the coupling portion is inserted into the guide hole of the coupled portion. Various methods other than the above-described methods can be used for the coupling between the tool unit 10 and the drive unit 60 and the coupling between the tool unit 10 and the torque transmission coupling 70.

Claims (2)

1. A hydraulic working apparatus, wherein,

the hydraulic working device is provided with: a tool unit including a hydraulic pump that generates pressure oil by rotating a rotary member, a 1 st rotary shaft connected to the rotary member, and a tool that operates using the pressure oil generated by the hydraulic pump; and

a drive unit having a motor for driving and rotating the rotary member of the hydraulic pump and a 2 nd rotation shaft rotated by the motor, the drive unit being detachable from the tool unit,

a coupling portion is provided at a distal end of either one of the 1 st rotation shaft of the tool unit and the 2 nd rotation shaft of the drive unit, and a coupled portion for coupling with the coupling portion is provided at a distal end of the other of the 1 st rotation shaft of the tool unit and the 2 nd rotation shaft of the drive unit,

the coupling portion has a guide shaft rotatable integrally with the 1 st or 2 nd rotation shaft and a plurality of conical engaging portions provided around the guide shaft,

the coupled part has a guide hole into which the guide shaft is inserted, and a recess having a circular cross-section, which is provided around the guide hole and into which the engaging parts are fitted.

2. The hydraulic working apparatus according to claim 1,

the hydraulic working apparatus further includes a torque transmission coupling having one end detachably attachable to the tool unit and the other end detachably attachable to the drive unit, the torque transmission coupling transmitting a rotational torque generated by the motor of the drive unit to the rotary member of the tool unit,

the torque transmission coupling includes: a rod-shaped shaft having flexibility; and a cover which covers an outer peripheral surface of the shaft, has flexibility, and transmits a rotational torque generated by the motor of the drive unit to the rotating member of the tool unit by rotating the shaft in the cover,

the shaft and the cover are flexible, so that the torque transmission coupling can be bent,

a coupled portion for coupling with the coupling portion provided at a distal end of either one of the 1 st rotation shaft of the tool unit and the 2 nd rotation shaft of the driving unit, and a coupling portion for coupling with the coupled portion provided at a distal end of the other of the 1 st rotation shaft of the tool unit and the 2 nd rotation shaft of the driving unit are provided at both ends of the torque transmission coupling, respectively.

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