JP2010017035A - Connection structure of power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the connection structure of a power generator which allows the power generator to be fixed easily and securely so that an input shaft is coaxially connected to an output shaft of a rotating drive unit that is driven to rotate by a power source of an apparatus body. <P>SOLUTION: In the connection structure 1a, the input shaft 112 of the power generator 11 is connected in the apparatus body to the output shaft 91 of the rotating drive unit 9 driven to rotate by power from the power source of the apparatus body to cause the power generator 11 to generate power. The connection structure 1a includes a contacted portion 92 which is formed of one outer surface of a box 90 making up the enclosure of the rotating drive unit 9, the outer surface crossing the axis of the output shaft 91, and with which the power generator 11 comes into contact, a contacting portion 113 which is provided on the power generator 11 to be formed of a surface crossing the axis of the input shaft 112 and comes in contact with the contacted portion 92 so that the input shaft 112 becomes almost parallel with the output shaft 91, and a fixing means 15 which aligns the axis of the output shaft 91 with that of the input shaft 112 to fix the contact portion 113 to the contacted portion 92. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a connection structure for a generator that generates electric power by an output from a rotary drive unit that is rotationally driven by the power of a power source of a main unit.

  Conventionally, a construction machine has a power source such as an engine and travels by the output of the power source, or drives a hydraulic mechanism to operate a work arm and an attachment connected to the work arm. It was. In addition, some attachments are operated by supplying power, such as a lifting magnet. In this case, a generator is mounted inside the device, and power is generated using power output from a power source. Electric power was supplied to the attachment (see, for example, Patent Document 1). More specifically, a hydraulic pump that converts engine power into hydraulic pressure and a hydraulic motor that rotationally drives the output shaft by the hydraulic pressure generated by the hydraulic pump are built in the construction machine body. Is connected to the output shaft of the hydraulic motor and receives torque to generate electric power.

  Here, the outline of the internal structure of an example of a construction machine is shown in FIGS. As shown in FIGS. 7 and 8, the construction machine 200 is rotatable with respect to the lower traveling body 2 configured with an endless track, the lower frame 3 attached to the lower traveling body 2, and the lower frame 3, An upper frame 4 having a machine room 41 inside, a cockpit 5 provided at the front of the upper frame 4, and an arm 6 are provided. The upper frame 4 generally has a flat shape that is long in the front-rear direction and narrow in the vertical direction due to restrictions on balance. In the upper frame 4, that is, in the machine room 41, a counterweight 42 is attached to the rearmost part, and an engine room 41 a is provided with partition walls 43 and 44 around the front of the counterweight 42. The engine 7 is housed. A cooling device 45 is provided on one side of the engine 7 to cool the engine 7, and an output shaft 7 a projects from the other side. The output shaft 7 a protrudes to the outside of the engine room 41 a through a through hole formed in the partition walls 43 and 44 and is connected to the hydraulic pump 8. The arm 6 is actuated by the hydraulic pressure generated by the hydraulic pump 8. On the other hand, a turning motor 46 is provided at a front portion of the engine room 41 a and a substantially central position of the entire machine room 41, and an output shaft 46 a of the turning motor 46 is connected to the lower frame 3. Here, a minimum storage space 41b for storing a tool or the like is secured on the side of the turning motor 46, and a door 4a is provided on the side of the upper frame 4 at a position corresponding to the storage space 41b. ing. A battery 47 is disposed in front of the accommodation space 41b.

Here, the attachment itself that is operated by electric power is arbitrarily used, and is not usually provided as a dedicated space for arranging the generator for the attachment, and the accommodation space 41b is used. That is, when the attachment is used, first, the hydraulic pipe 201 is disposed from the hydraulic pump 8 to the accommodation space 41b, and the hydraulic motor 202 is connected thereto. Further, the generator 204 is fixed to the upper frame 4 by the fixing jig 203 adjacent to the hydraulic motor 202, and the output shaft 202a of the hydraulic motor 202 and the input shaft 204a of the generator 204 are connected so as to be coaxial. As a result, torque is input to the input shaft 204a of the generator 204 to generate power.
JP-A-8-165680

  However, as in Patent Document 1, a space for installing a generator inside a main body device such as a construction machine is usually limited by the relationship with each structure that is permanently installed in the main body device as shown in FIGS. Therefore, it is extremely difficult to connect the output shaft and the input shaft of a rotary drive unit such as a hydraulic motor so that they are coaxial.

  The present invention has been made in view of the above-described circumstances, and the generator is easily and surely connected so that the input shaft is coaxially connected to the output shaft of the rotational drive unit that is rotationally driven by the power source of the main body device. A generator connection structure capable of fixing the generator is provided.

In order to solve the above problems, the present invention proposes the following means.
The present invention relates to a generator for connecting an input shaft of a generator inside the main body device to an output shaft of a rotary drive unit that is rotationally driven by the power of a power source of the main body device, and generating power by the generator. A connecting structure, which is provided on a box body that forms an outline of the rotation drive unit, and has an outer surface that intersects with an axis of the output shaft; A contact portion that is formed on a surface that intersects the axis of the input shaft, contacts the contacted portion so that the input shaft is substantially parallel to the output shaft, and the output shaft A fixing means for fixing the abutted portion and the abutting portion by aligning an axis line with the axis of the input shaft is provided.

  According to this configuration, the input shaft of the generator is connected to the output of the rotation drive unit by contacting the contact portion provided on the generator with the outer surface of the box that forms the outer periphery of the rotation drive unit as the contacted portion. It can be made to become a state substantially parallel to an axis. Then, by fixing with the fixing means in a state where the contacted part and the contact part are in contact with each other, the generator is configured so that its input shaft is coaxial with the output shaft of the rotation drive unit of the main unit. Can be connected and fixed. In other words, the rotational drive unit and the generator are merely fixed by the fixing means by bringing the contacted part and the contact part constituting the surface into contact with each other without requiring other members. The generator can be easily and stably fixed so that the output shaft of the rotary drive unit and the input shaft of the generator are coaxial. In addition, since the generator is directly fixed to the rotation drive unit, the generator can be mounted by effectively using the limited space inside the main unit.

  Further, the present invention provides a power generator for connecting an input shaft of a generator inside the main body device to an output shaft of a rotation driving unit that is rotationally driven by power of a power source of the main body device, and generating power by the generator. A connection structure of the machine, a substantially plate-like member fixed inside the main body apparatus, and a main body side connection portion to which the rotation drive unit is fixed so that one surface of the output shaft intersects the axis And a connecting member having the other surface as a contacted portion to which the generator is abutted and fixed, and a fixing means for fixing the generator in contact with the abutted portion to the connecting member. The generator has a contact portion that is formed of a surface that intersects the axis of the input shaft and contacts the contacted portion so that the input shaft is substantially parallel to the output shaft. The fixing means matches the axis of the output shaft with the axis of the input shaft. Te, it is characterized by fixing the said abutted portion and the contact portion in contact with each other.

  According to this configuration, in the connection member fixed inside the main body device and having the one surface as the main body side connection portion and the rotation driving portion being fixed, the contact portion provided on the generator with the other surface as the contact portion is provided. By abutting, the input shaft of the generator can be made substantially parallel to the output shaft of the rotation drive unit. Then, by fixing with the fixing means in a state where the contacted part and the contact part are in contact with each other, the generator is configured so that its input shaft is coaxial with the output shaft of the rotation drive unit of the main unit. Can be connected, fixed. In other words, the connecting member and the generator to which the rotation drive unit is fixed are simply fixed by the fixing means by bringing the contacted portion and the contact portion constituting the surface into contact with each other, and thereby the rotation drive portion. The output shaft and the input shaft of the generator are coaxial, so that the generator can be fixed easily and stably. In addition, since the generator is fixed to the rotation drive unit via the connecting member, the installation position of the generator can be freely changed according to the fixing position of the connecting member inside the main body device, and the limited space Thus, a generator can be mounted by selecting a suitable position.

  Further, the generator is cantilevered with respect to the abutted portion by being fixed by the fixing means in a state where the abutting portion is in contact with the abutted portion. preferable.

  According to this configuration, the generator is cantilevered with respect to the abutted portion, so that the base for supporting the bottom portion of the generator is not required and extends in the horizontal direction with respect to the abutted portion. A generator can be arranged. For this reason, it is possible to save space in the vertical direction while increasing the degree of freedom of the installation location of the generator.

  Further, the main body device includes an engine that is the power source, a hydraulic pump that outputs an oil pressure by rotational driving of the engine, and a hydraulic motor that is the rotational driving unit that is rotationally driven by the hydraulic pressure of the hydraulic pump. Preferably, the generator is a power supply device for an attachment used in the construction machine, and the input shaft is connected to the output shaft of the hydraulic motor.

  According to this configuration, the input shaft of the generator that is the power supply device of the attachment is easily and reliably connected to the output shaft of the hydraulic motor by bringing the contact portion into contact with the contacted portion and fixing by the fixing means. And can be fixed. Therefore, a generator can be suitably mounted inside a construction machine having a complicated structure such as an engine, a hydraulic system, or an electric system. And an attachment can be used conveniently in a construction machine by supplying electric power to an attachment from this generator.

  According to the generator connection structure of the present invention, the generator can be fixed easily and reliably so that the input shaft is coaxially connected to the output shaft of the rotation drive unit that is driven to rotate by the power source of the main unit. it can.

  1 to 4 show an embodiment according to the present invention. As shown in FIG. 1 to FIG. 3, in this embodiment, the main body device travels by the lower traveling body 2 on the endless track, and the upper frame 4 can turn on the lower frame 3 supported by the lower traveling body 2. A case where an attachment is attached to the construction machine 1 will be described as an example. In addition, about the point same as the internal structure of the construction machine 200 mentioned above, the code | symbol is the same and description is abbreviate | omitted. As shown in FIG. 1, the construction machine 1 according to the present embodiment includes a lifting magnet 10 attached as an attachment to the tip of an arm 6, and a generator 11 that supplies the lifting magnet 10 with electric power and operates it. The generator 11 is mounted in the upper frame 4 and is connected to a lifting magnet 10 attached to the tip of the arm 6 by a cable (not shown). The lifting magnet 10 lifts a magnetic material such as iron scrap by electromagnetic force, and can generate electromagnetic force by electric power from the generator 11.

  As shown in FIGS. 2 and 3, in this embodiment, a hydraulic motor 9 serving as a rotational drive unit is directly connected to one of the hydraulic pumps 8 connected to the output shaft 7a of the engine 7 serving as a power source. ing. The generator 11 is fixed to one outer surface 90 a of the box 90 that forms the outline of the hydraulic motor 9. Below, the detail of the connection structure of the hydraulic motor 9 and the generator 11 is demonstrated.

  As shown in FIG. 4, the generator 11 is attached to a box body 110 that forms an outer shell, a power generation unit 111 housed in the box body 110, and a power generation unit 111 that is rotatable about an axis. And an input shaft 112 projecting from the body 110 to the outside. The input shaft 112 is rotatably supported by a bearing 110 a provided in the box body 110. The power generation unit 111 includes a rotor 111a having a permanent magnet and rotatable with the input shaft 112, and a stator 111b having a coil disposed on the outer peripheral side of the permanent magnet and fixed to the box 110. Power generation is possible by the electromotive force generated in the coil as the rotor 111a rotates. Further, one outer surface 110b constituting the box body 110 projects laterally in a flange shape, and is in contact with a later-described contacted portion 92 on the hydraulic motor 9 side as a contact portion 113, and is fixed. The bearing 110 a is provided at the center of the contact portion 113, and the input shaft 112 that is rotatably supported protrudes so as to be substantially orthogonal to the contact portion 113. In addition, a positioning protrusion 110c protrudes on the radially outer side of the input shaft 112 protruding at the contact portion 113. A plurality of positioning convex portions 110 c are arranged in a circumferential shape around the axis of the input shaft 112. In addition, a through hole 110 d is formed in a portion of the contact portion 113 that protrudes to the side substantially parallel to the input shaft 112. A plurality of through-holes 110d are also arranged circumferentially around the axis of the input shaft 112.

  On the other hand, the hydraulic motor 9 to which the generator 11 is connected includes a box 90 that forms an outer shell, a hydraulic drive unit (not shown) that generates torque by hydraulic pressure that is built in the box 90 and that is input from the hydraulic pump 8, and a box It protrudes from the body 90 and can be rotated around an axis by a hydraulic drive unit (not shown), and includes an input shaft 112 and an output shaft 91 that is splined. Further, one outer surface 90a constituting the box body 90 projects sideways in the form of a flange, and comes into contact with the contact portion 113 on the generator 11 side as the contacted portion 92, and the generator 11 is fixed. Yes. A recessed portion 90b is provided in the central portion of the contacted portion 92, and the output shaft 91 supported rotatably by the bearing 90c protrudes in the recessed portion 90b so that the axis is substantially orthogonal to the contacted portion 92. ing. In the abutted portion 92, a positioning recess 90 d is formed on the radially outer side of the output shaft 91. A plurality of positioning recesses 90d are arranged circumferentially around the axis of the output shaft 91 corresponding to the positioning protrusions 110c on the generator 11 side. In addition, a through hole 90 e is formed in a portion of the abutted portion 92 that protrudes to the side substantially parallel to the output shaft 91. A plurality of through-holes 90e are arranged around the axis of the output shaft 91 so as to correspond to the through-holes 110d on the generator 11 side.

  Then, when the contact portion 113 is in contact with the contacted portion 92, the axis of the input shaft 112 of the generator 11 substantially orthogonal to the contact portion 113 of the hydraulic motor 9 is approximately orthogonal to the contacted portion 92. It is substantially parallel to the axis of the output shaft 91. Further, in the generator 11 and the hydraulic motor 9, the positioning convex portion 110c and the positioning concave portion 90d are fitted, and the fixing nut 13 is screwed to the fixing bolt 12 inserted through the through holes 110d and 90e. By being tightened, the generator 11 and the hydraulic motor 9 are fixed with the axis of the input shaft 112 and the axis of the output shaft 91 aligned. That is, the positioning convex portion 110c and the positioning concave portion 90d, the fixing bolt 12 and the fixing nut 13 align the axis of the input shaft 112 with the axis of the output shaft 91 so as to contact the contacted portion 92. The fixing means 15 for fixing the contact portion 113 is configured, and the connecting structure 1a for connecting the generator 11 to the hydraulic motor 9 is configured by the fixing means 15, the contacted portion 92, and the contact portion 113. Will be doing. In the state of being fixed by the fixing means 15, the generator 11 is supported in a cantilever manner so as to extend in the axial direction of the input shaft 112 with respect to the contacted portion 92 of the hydraulic motor 9.

  In the connection structure 1 a as described above, when the generator 11 is connected to the hydraulic motor 9 directly connected to the hydraulic pump 8 in the construction machine 1, the contact portion 113 provided on the generator 11 is connected to the hydraulic motor 9. By abutting against the abutted portion 92, the input shaft 112 of the generator 11 can be brought into a substantially parallel state with the output shaft 91 of the hydraulic motor 9. The generator 11 fixes the input shaft 112 of the hydraulic motor 9 of the construction machine 1 by fixing the input portion 112 with the contacted portion 92 and the contact portion 113 being in contact with each other. And can be connected and fixed so as to be coaxial. For this reason, the hydraulic motor 9 and the generator 11 are fixed by the fixing means 15 by bringing the contacted portion 92 and the contact portion 113 constituting the surface into contact with each other without requiring other members. Thus, the generator 11 can be easily and stably fixed so that the input shaft 112 of the generator 11 and the output shaft 91 of the hydraulic motor 9 are coaxial. Further, since the generator 11 is directly fixed to the hydraulic motor 9 directly connected to the hydraulic pump 8, the generator 11 can be mounted by effectively using the limited space inside the construction machine 1. . And by supplying electric power with this generator 11, the lifting magnet 10 of an attachment can be used conveniently. In addition, since the generator 11 is supported in a cantilever manner with respect to the abutted portion 92 as described above, a base for supporting the bottom portion of the generator 11 is not necessary, and the abutted portion 92 is The generator 11 can be arranged so as to extend in the horizontal direction. For this reason, it is possible to save space in the vertical direction while increasing the degree of freedom of the installation location of the generator 11. In particular, in a construction machine 1 or the like that is restricted in the vertical direction due to the balance of the center of gravity, the generator 11 can be mounted so as to extend in the horizontal direction in a cantilever manner as described above, so that a limited space is provided. Thus, the generator 11 can be more suitably mounted.

  In the above description, the fixing means 15 is configured by the positioning convex portion 110c and the positioning concave portion 90d, the fixing bolt 12 and the fixing nut 13, but is not limited thereto. Even if only the fixing bolt 12 and the fixing nut 13 are used, the fixing bolts 12 can be inserted by aligning the through holes 110d and 90e with each other, so that the axes can be aligned and fixed.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. 5 and 6 show a second embodiment of the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  As shown in FIG. 5, in this embodiment, the generator 11 is disposed in the accommodation space 41 b in the machine room 41, and connects the hydraulic motor 9 and the connecting member 101 connected from the hydraulic pump 8 by the hydraulic pipe 8 a. Connected through. As shown in FIG. 6, the connection member 101 is a substantially plate-like member, and a fixing collar portion 102 projects laterally at the lower end. A through hole 102a is formed in the fixing flange 102, and the connecting member 101 is connected to the bottom plate 4b by screwing the support bolt 103 inserted through the through hole 102a into the bottom plate 4b of the upper frame 4. It is erected so as to be substantially vertical. Further, the hydraulic motor 9 is connected to one surface of the connecting member 101 as the main body side connecting portion 103. That is, the outer surface 90 a of the box 90 of the hydraulic motor 9 abuts on the main body side connection portion 103, so that the hydraulic motor 9 can be described later so that the axis of the output shaft 91 is substantially orthogonal to the main body side connection portion 103. The fixing bolt 12 and the fixing nut 13 are fixed. In this state, the positioning concave portion 90d formed on the outer surface 90a is fitted into the positioning convex portion 101a formed on the main body side connection portion 103, whereby the output shaft 91 of the hydraulic motor 9 is connected to the connecting member. 101 is arranged so as to be coaxial with the through-hole 101 b formed in 101.

  Further, the generator 11 is connected to the other surface opposite to the main body side connecting portion 103 which is one surface of the connecting member 101 to which the hydraulic motor 9 is connected, as a contacted portion 104 serving as a generator side connecting portion. Yes. Here, when the abutting portion 113 of the generator 11 abuts on the abutted portion 104, the input shaft 112 of the generator 11 has an axis substantially orthogonal to the abutted portion 104, that is, connected to the connection member 101. The output shaft 91 of the hydraulic motor 9 is substantially parallel to the axis. Further, the positioning convex portion 110 c formed on the contact portion 113 is fitted with the positioning concave portion 101 c formed on the contacted portion 104, and further, the penetration formed in the hydraulic motor 9, the connecting member 101, and the generator 11. Since the fixing bolt 12 is inserted into the holes 90e, 101d, and 110d and is tightened by the fixing nut 13, the generator 11 and the hydraulic motor 9 are connected to the axis of the input shaft 112 and output via the connecting member 101. The shaft 91 is fixed so as to coincide with the axis. In other words, the positioning projections 110 c and the positioning recesses 101 c, the fixing bolts 12, and the fixing nuts 13 make the axis of the input shaft 112 and the axis of the output shaft 91 coincide with each other to contact the contacted portion 104. The fixing means 105 for fixing the contact portion 113 is configured, and the generator 11 is connected to the hydraulic motor 9 via the connection member 101 by the fixing means 105, the contacted portion 104, and the contact portion 113. The connection structure 100a to be configured is configured. In the state of being fixed by the fixing means 105, the generator 11 is supported in a cantilever manner so as to extend in the axial direction of the input shaft 112 with respect to the contacted portion 104 of the connecting member 101.

  In the connection structure 100a as described above, when the generator 11 is connected to the connection member 101 to which the hydraulic motor 9 is connected in the construction machine 100, the contact portion 113 provided on the generator 11 is connected to the connection member 101. By abutting on the abutted portion 104, the input shaft 112 of the generator 11 can be brought into a substantially parallel state with the output shaft 91 of the hydraulic motor 9 connected to the connecting member 101. The generator 11 fixes the input shaft 112 of the hydraulic motor 9 of the construction machine 100 by fixing the contacted portion 104 and the contact portion 113 with the fixing means 105 in a state where the contacted portion 104 and the contact portion 113 are in contact with each other. And can be connected and fixed so as to be coaxial. For this reason, the hydraulic motor 9 and the generator 11 are merely fixed by the fixing means 105 by bringing the contacted portion 104 and the contact portion 113 constituting the surface into contact with each other. The generator 11 can be fixed easily and stably by making the input shaft 112 and the output shaft 91 of the hydraulic motor 9 coaxial. Further, since the generator 11 is fixed to the hydraulic motor 9 via the connection member 101, the installation position of the generator 11 can be freely changed according to the fixing position of the connection member 101 inside the construction machine 100. The generator 11 can be mounted in a limited space by selecting a suitable position. Further, as described above, the generator 11 is supported in a cantilevered manner with respect to the abutted portion 104, so that the degree of freedom of the installation location of the generator 11 is increased as in the first embodiment. Thus, space saving in the vertical direction can be achieved.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

It is a side view which shows the outline | summary of the construction machine of 1st Embodiment of this invention. In the construction machine of 1st Embodiment of this invention, it is sectional drawing seen from the upper frame. In the construction machine of 1st Embodiment of this invention, it is sectional drawing seen from the side of an upper frame. In the construction machine of 1st Embodiment of this invention, it is sectional drawing which shows the detail of the connection structure of a generator. In the construction machine of the 2nd Embodiment of this invention, it is sectional drawing seen from the upper frame. In the construction machine of 2nd Embodiment of this invention, it is sectional drawing which shows the detail of the connection structure of a generator. It is sectional drawing which looked at the upper frame in the conventional construction machine. In the conventional construction machine, it is sectional drawing which looked at the upper frame side.

Explanation of symbols

1, 100 Construction equipment 1a, 100a Connection structure 7 Engine (power source)
9 Hydraulic motor (rotary drive)
90 Box 91 Output shaft 92, 104 Contacted part 10 Lifting magnet (attachment)
DESCRIPTION OF SYMBOLS 11 Generator 15,105 Fixing means 101 Connection member 103 Main body side connection part 112 Input shaft 113 Contact part

Claims (4)

A generator connection structure for connecting an input shaft of a generator to the output shaft of a rotation drive unit that is rotationally driven by the power of a power source of the main body device within the main body device, and generating power by the generator. And
Provided in a box body that forms an outline of the rotation drive unit, and comprises an outer surface that intersects the axis of the output shaft, and a contacted part to which the generator is contacted;
A contact portion that is provided on the generator and includes a surface that intersects the axis of the input shaft, the contact portion contacting the contacted portion so that the input shaft is substantially parallel to the output shaft;
A generator connection structure, comprising: a fixing means for fixing the abutted portion and the abutting portion by aligning the axis of the output shaft with the axis of the input shaft. A generator connection structure for connecting an input shaft of a generator to the output shaft of a rotation drive unit that is rotationally driven by the power of a power source of the main body device inside the main body device, and generating power by the generator. And
A substantially plate-like member fixed inside the main body device, with one surface serving as a main body side connecting portion to which the rotation driving portion is fixed so that the axis of the output shaft intersects, and the other surface serving as the power generation A connecting member as a contacted part to which the machine is contacted and fixed;
Fixing means for fixing the generator that is in contact with the contacted portion to the connection member;
The generator has a contact portion that is a surface that intersects the axis of the input shaft, and that contacts the contacted portion so that the input shaft is substantially parallel to the output shaft,
The generator connecting structure characterized in that the fixing means fixes the abutting portion and the abutted portion that are in contact with each other by aligning the axis of the output shaft and the axis of the input shaft. . In the generator connection structure according to claim 1 or 2,
The generator is cantilevered with respect to the abutted portion by being fixed by the fixing means in a state where the abutting portion is in contact with the abutted portion. Connecting structure of generator. In the connection structure of the generator in any one of Claims 1-3,
The main body device includes an engine that is the power source, a hydraulic pump that outputs an oil pressure by rotational driving of the engine, and a hydraulic motor that is the rotational driving unit that is rotationally driven by the hydraulic pressure of the hydraulic pump. Machine,
The generator is a power supply device for an attachment used in the construction machine, wherein the input shaft is connected to the output shaft of the hydraulic motor.

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