JP6154638B2 - transmission - Google Patents

Description

  The present invention relates to a transmission in which a speed change mechanism is accommodated in a rotary housing.

  An endless track vehicle such as a hydraulic excavator is provided with a travel motor on an axle portion of an endless track (crawler belt).

  Patent Document 1 discloses a traveling motor for a hydraulic excavator that includes a transmission having a cylindrical rotating housing to which a sprocket that meshes with a crawler belt is coupled, and the transmission and the sprocket rotate together to drive the crawler belt. ing.

  The transmission includes a disk-shaped cover that covers and closes the opening of the rotary housing. A transmission mechanism that decelerates the rotation of the hydraulic motor and transmits it to the rotary housing is housed in the rotary housing and the cover, and is filled with lubricating oil that lubricates the transmission mechanism. A port for supplying and discharging lubricating oil is opened on the cover, and a plug (plug body) for closing the port is detachably attached.

  The cover is fastened to the open end of the rotary housing via a plurality of bolts. A hole for allowing the bolt to pass through is formed in the cover. A screw hole that engages with the bolt is formed in the rotary housing so as to extend in the axial direction. A plurality of bolts penetrating the cover are screwed into the opening end of the rotating housing, whereby the cover is coupled to the rotating housing.

JP-A-9-240525

  The transmission that drives the crawler belt is required to have a small outer shape because the rotary housing is disposed in a limited space inside the path through which the crawler belt circulates.

  However, in such a conventional transmission, since the cover is coupled to the rotary housing via a bolt arranged so as to extend in the axial direction, the size of the outer shape is increased due to the space in which the bolt is provided. was there.

  The present invention has been made in view of the above problems, and an object of the present invention is to reduce the size of a transmission in which a transmission mechanism is accommodated in a rotary housing.

The present invention relates to a transmission in which the rotary housing is rotated by a transmission mechanism housed in the rotary housing, the disc-shaped cover provided at the opening end of the rotary housing, and the cover in the axial direction with respect to the rotary housing. A retaining mechanism that restricts movement of the cover, an O-ring that seals between the cover and the rotating housing, and a rotation restricting portion that restricts rotation of the cover relative to the rotating housing by being fitted to a jig. The O-ring is arranged between the retaining mechanism and the rotation restricting portion in the axial direction of the rotary housing .

  In the present invention, since the cover is prevented from being detached from the rotating housing by the retaining mechanism, a bolt or the like for fastening the cover to the rotating housing becomes unnecessary, and the transmission can be downsized.

1 is a side view of a transmission according to a first embodiment of the present invention. It is sectional drawing which follows the AA line of FIG. It is a side view which shows a mode that rotation prevention of a cover is performed through a jig | tool. It is sectional drawing which follows the BB line of FIG. It is a side view of the transmission which concerns on 2nd Embodiment of this invention. It is sectional drawing which follows the DD line | wire of FIG. It is a side view of the transmission which concerns on 3rd Embodiment of this invention. It is sectional drawing which follows the FF line | wire of FIG.

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

(First embodiment)
A transmission 100 shown in FIGS. 1 and 2 is provided on an axle portion of a crawler type vehicle such as a hydraulic excavator, for example, and constitutes a traveling motor that drives a crawler belt.

  The transmission 100 includes a rotating housing 20 that rotates with respect to a fixed housing (not shown). A sprocket (not shown) is connected to the outer periphery of the rotary housing 20. As the rotary housing 20 and the sprocket rotate together, a crawler belt (not shown) that meshes with the sprocket circulates and the vehicle travels.

  The stationary housing and the rotating housing 20 are disposed inside a path through which the crawler belt circulates. The rotary housing 20 is rotatably supported via a bearing (not shown) with respect to a fixed housing connected to the vehicle frame, and rotates around the rotation axis O. A hydraulic motor (swash plate type piston motor) (not shown) is provided as a rotational drive source inside the fixed housing.

  As shown in FIG. 2, a transmission mechanism 10 is provided inside the rotary housing 20. The speed change mechanism 10 includes a sun gear 11 provided on the shaft 2 of the hydraulic motor, an inner gear 12 provided along the inner wall of the rotary housing 20, a plurality of planetary gears 13 that mesh with both the sun gear 11 and the inner gear 12, And a planetary carrier 14 that supports the planetary gear 13. The speed change mechanism 10 decelerates the output rotation of the shaft 2 of the hydraulic motor and transmits it to the rotary housing 20.

  The cylindrical rotating housing 20 has a flange portion (not shown) protruding from the outer peripheral surface 22, and the sprocket is connected to the flange portion. As a result, the sprocket rotates with the rotary housing 20.

  A disc-shaped cover 40 that closes the opening of the rotary housing 20 is provided at the opening end of the rotary housing 20. A gear chamber 19 that houses the speed change mechanism 10 is defined inside the rotary housing 20 that is closed by the cover 40. The gear chamber 19 is filled with lubricating oil that lubricates the transmission mechanism 10.

  As shown in FIG. 1, three ports 47 to 49 are opened in the cover 40, and plugs (plug bodies) 9 that close the ports 47 to 49 are detachably attached thereto.

  The port 47 is disposed at the center of the cover 40. By removing the plug 9 from the port 47, the amount of lubricating oil filled in the gear chamber 19 can be confirmed through the port 47.

  The port 48 is disposed at the bottom of the cover 40. By removing the plug 9 from the port 48, the lubricating oil in the gear chamber 19 can be discharged to the outside through the port 48.

  The port 49 is disposed on the upper right portion of the cover 40 in FIG. By removing the plug 9 from the port 49, the lubricating oil can be filled into the gear chamber 19 through the port 48.

  Threaded portions are formed on the inner periphery of the ports 47 to 49, and the plugs 9 are screwed and attached to these threaded portions.

  The plug 9 includes a screw portion 9A that is screwed into the screw portions of the ports 47 to 49, a head portion 9B that is seated on the cover 40, and a tool hole 9C that is open at an end surface of the head portion 9B. When the plug 9 is removed, the operator inserts a tool (not shown) into the tool hole 9C and rotates the plug 9 through the tool.

  Counterbore holes 43 are provided around the ports 47 to 49, and these counterbore holes 43 are formed so as to be recessed in a concave shape with respect to the end surface 41 of the cover 40. The head portion 9B of the plug 9 is accommodated in the counterbore 43, and the head portion 9B is disposed so as not to protrude from the end surface 41 of the cover 40 in the direction of the rotation axis O.

  Next, a structure for coupling the cover 40 to the rotary housing 20 will be described.

  As shown in FIG. 2, an annular mounting seat 23 is formed on the inner peripheral surface of the opening end of the rotary housing 20, and the outer peripheral portion of the cover 40 is fitted into the mounting seat 23.

  The mounting seat 23 includes a cylindrical inner peripheral surface 23A centering on the rotation axis O, and an annular stepped portion 23B orthogonal to the rotation axis O.

  The disc-shaped cover 40 has a cylindrical outer peripheral surface 42 centering on the rotation axis O and an annular outer peripheral end surface 44 orthogonal to the rotation axis O.

  The cover 40 is supported in the radial direction of the rotary housing 20 by fitting the outer peripheral surface 42 of the cover 40 to the inner peripheral surface 23 </ b> A of the mounting seat 23. The “radial direction” means a radial direction around the rotation axis O of the rotary housing 20.

  When the outer peripheral end surface 44 of the cover 40 contacts the stepped portion 23B of the mounting seat 23, the cover 40 is prevented from moving to the back side (left side in FIG. 2) in the axial direction of the rotary housing 20. The “axial direction” means a direction in which a line parallel to the rotation axis O of the rotary housing 20 extends.

  An O-ring 3 that seals the gear chamber 19 is interposed between the rotary housing 20 and the cover 40. An annular seal groove 46 is formed on the outer peripheral surface 42 of the cover 40, and the O-ring 3 is accommodated in the seal groove 46. The O-ring 3 is interposed between the seal groove 46 and the inner peripheral surface 23A of the mounting seat 23 by being compressed.

  A retaining mechanism 50 that prevents the cover 40 from coming off is provided between the rotary housing 20 and the cover 40.

  The retaining mechanism 50 includes an inner peripheral groove 25 formed on the mounting seat 23 of the rotary housing 20, an outer peripheral groove 45 formed on the outer peripheral surface 42 of the cover 40, and an intermediate groove 25 and an outer peripheral groove 45. And a wire 4 to be mounted.

  The outer diameter of the wire 4 is formed smaller than the inner diameter of the hole formed by the inner circumferential groove 25 and the outer circumferential groove 45. The wire 4 is made of a single metal wire. The wire 4 is not limited to this, and a stranded wire in which a plurality of thin metal wires are collected may be used.

  The inner circumferential groove 25 is formed in an annular shape that opens in the inner circumferential surface 23A of the mounting seat 23 and extends in the circumferential direction. The outer circumferential groove 45 is formed in an annular shape that opens in the outer circumferential surface 42 of the cover 40 so as to face the inner circumferential groove 25 and extends in the circumferential direction. The “circumferential direction” means a direction around the rotation axis O.

  In addition, a wire mounting hole 26 is formed in the rotary housing 20 so as to penetrate the opening end of the rotary housing 20 in the radial direction. When the cover 40 is assembled to the rotary housing 20, after the cover 40 is fitted into the mounting seat 23 of the rotary housing 20, the wire 4 is inserted from the wire mounting hole 26, and the wire 4 is inserted between the inner peripheral groove 25 and the outer peripheral groove 45. Insert into.

  In this way, the wire 4 is interposed between the inner peripheral groove 25 and the outer peripheral groove 45 after making a round around the cover 40. The wire 4 functions as a movement restricting member that restricts the movement of the cover 40 in the axial direction with respect to the rotary housing 20 by fitting between the inner peripheral groove 25 and the outer peripheral groove 45.

  After the wire 4 is assembled, the wire mounting hole 26 is closed by a plug (not shown). When removing the cover 40 from the rotary housing 20, an operator removes the plug from the wire mounting hole 26 and pulls out the wire 4 from the wire mounting hole 26.

  The retaining mechanism 50 allows the cover 40 to rotate with respect to the rotary housing 20 and restricts the cover 40 from moving in the axial direction. For this reason, for example, when a certain rotational force is applied to the cover 40 via the tool fitted in the tool hole 9C of the plug 9 during the operation of turning the plug 9 via a tool and removing it, the cover 40 is applied to the rotary housing 20. On the other hand, since it rotates, it becomes difficult to remove the plug.

  In response to this, as shown in FIGS. 3 and 4, a rotation restricting portion 60 that restricts the rotation of the cover 40 relative to the rotating housing 20 using the jig 6 is provided between the rotating housing 20 and the cover 40. It is done.

  The rotation restricting portion 60 includes a first recess 61 and a second recess 62 that are recessed in a concave shape across the rotary housing 20 and the cover 40. The rotation restricting portion 60 is provided side by side with the retaining mechanism 50 and the seal groove 46 in the axial direction.

  The first recessed portion 61 has a semicylindrical recessed inner peripheral surface 61A that opens to the end surface 21 of the rotary housing 20 and the inner peripheral surface 23A of the mounting seat 23 and extends in the axial direction.

  The second recessed portion 62 has an inner circumferential surface 62A of a recessed portion that is open on the end surface 41 and the outer circumferential surface 42 of the cover 40 and extends in the axial direction.

  By adjusting the assembly position of the cover 40 with respect to the rotation housing 20 in the rotation direction, the first recess 61 and the second recess 62 are arranged to face each other. In this state, the first recess 61 and the second recess 62 constitute a cylindrical fitting hole extending in the axial direction.

  A cylindrical pin is used for the jig 6 used when the rotation is restricted. The outer diameter of the jig 6 is formed slightly smaller than the inner diameter of the fitting hole formed by the first recess 61 and the second recess 62. When the jig 6 is inserted into the first concave portion 61 and the second concave portion 62 from the axial direction, the tip end portion of the jig 6 is fitted into the first concave portion 61 and the second concave portion 62.

  Note that the jig 6 is not limited to the cylindrical pin as described above, and a pin having another shape may be used. In that case, the 1st recessed part 61 and the 2nd recessed part 62 comprise the fitting hole of the shape in alignment with the external shape of this pin.

  As shown in FIG. 3, in the state where the tip of the jig 6 is fitted over the first recess 61 and the second recess 62, a rotational force acts on the cover 40 in the direction indicated by the arrow C, so that the cover 40 is rotated by the rotary housing 20. When the jig 6 is slightly rotated, the jig 6 is sandwiched between the first recess 61 and the second recess 62. Thereby, rotation of the cover 40 with respect to the rotation housing 20 is stopped.

  For example, when the lubricating oil in the gear chamber 19 is changed, a rotational force is applied to the cover 40 via the tool when the plug 9 is turned via the tool and removed. At this time, the jig 6 functions as a rotation restricting member that restricts the rotation of the cover 40 relative to the rotary housing 20 by inserting the jig 6 into the first concave portion 61 and the second concave portion 62 in advance from the axial direction. Thereby, it is not necessary to apply a force against the rotational force acting on the cover 40 to the jig 6, the rotation of the cover 40 with respect to the rotary housing 20 is stopped, and the work of detaching the plug 9 can be performed smoothly.

  When the transmission 100 is operated, the jig 6 is removed from the rotation restricting portion 60, so that nothing protrudes in the axial direction from the end surface 41 of the cover 40.

  According to the above 1st Embodiment, there exists an effect shown below.

  [1] The transmission 100 includes a disc-shaped cover 40 that is fitted into the opening of the rotary housing 20, a retaining mechanism 50 that restricts the cover 40 from moving in the direction of the rotation axis O with respect to the rotary housing 20, and It was supposed to be equipped with.

  Thus, in the transmission 100, the cover 40 is prevented from being detached from the rotating housing 20 by the retaining mechanism 50, so that a bolt or the like for fastening the cover 40 to the rotating housing 20 becomes unnecessary, and the transmission 100 can be downsized. I can plan.

  [2] The retaining mechanism 50 includes an inner peripheral groove 25 formed on the inner periphery of the rotary housing 20, an outer peripheral groove 45 formed on the outer periphery of the cover 40, and an intermediate groove 25 and an outer peripheral groove 45. And the wire 4 to be worn.

  When the wire 4 engages with the inner circumferential groove 25 and the outer circumferential groove 45, the cover 40 fitted in the opening end of the rotary housing 20 is prevented from moving and removing in the axial direction. Since the wire 4 is provided without protruding to the outside of the rotary housing 20 and the cover 40, the transmission 100 can be reduced in size.

  [3] The transmission 100 includes a rotation restricting portion 60 that restricts the rotation of the cover 40 relative to the rotating housing 20 by fitting the jig 6.

  When the plug 9 is attached to or detached from the cover 40, the jig 6 is fitted to the rotation restricting portion 60, whereby the rotation restricting portion 60 fitted to the jig 6 stops the rotation of the cover 40 with respect to the rotating housing 20. It is done. Thereby, since the position of the plug 9 does not move, the operation | work which rotates the plug 9 via a tool and can be attached / detached can be performed smoothly.

  When the transmission 100 is operated, the jig 6 is removed from the rotation restricting portion 60, so that an increase in the size of the transmission 100 can be avoided.

  [4] The rotation restricting portion 60 includes a first concave portion 61 that opens to the rotary housing 20 and a second concave portion 62 that opens to the cover 40, and the first concave portion 61 and the second concave portion 62 are located at positions facing each other. The jig 6 was fitted over the first recess 61 and the second recess 62 in a certain state.

  Thereby, in the state where the jig 6 is fitted over the first recess 61 and the second recess 62, it is not necessary to apply a force to the jig 6 against the rotational force acting on the cover 40, and the cover 40 against the rotary housing 20 is not required. Is stopped.

  [5] The first concave portion 61 and the second concave portion 62 are extended in the axial direction of the rotary housing 20 in a state of being opposed to each other, and constitute a fitting hole into which the jig 6 is fitted.

  The front end portion of the jig 6 is fitted into the first concave portion 61 and the second concave portion 62 constituting the fitting hole, whereby the rotation of the cover 40 with respect to the rotary housing 20 is stopped.

  The jig 6 is inserted into the hole-shaped first recess 61 and the second recess 62 from the axial direction. Since the rotary housing 20 is disposed inside the path through which the crawler belt circulates, a sufficient work space for inserting the jig 6 in the axial direction is secured outside the rotary housing 20.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. Below, it demonstrates centering on a different point from the said 1st Embodiment, the same code | symbol is attached | subjected to the structure which has the substantially same function as the transmission 100 of the said 1st Embodiment, and description is abbreviate | omitted.

  In the transmission 100 according to the first embodiment, the jig 6 is configured to fit into the rotation restricting portion 60 from the axial direction of the rotary housing 20. In contrast, in the transmission 200 according to the second embodiment, the jig 7 is configured to be fitted to the rotation restricting portion 70 from the radial direction of the rotary housing 20.

  The rotation restricting portion 70 includes a first concave portion 71 and a second concave portion 72 that are recessed in a concave shape across the rotary housing 20 and the cover 40.

  The first recess 71 is formed as a slit that opens in the end surface 21 of the rotary housing 20, the inner peripheral surface 23 </ b> A of the mounting seat 23, and the outer peripheral surface 22 and extends in the radial direction.

  The second recess 72 is formed as a slit that opens in the end surface 41 and the outer peripheral surface 42 of the cover 40 and extends in the radial direction.

  By adjusting the assembly position of the cover 40 with respect to the rotation housing 20 in the rotation direction, the first recess 71 and the second recess 72 extend in the same radial direction and are arranged to face each other. In this state, the first recess 71 and the second recess 72 constitute one fitting groove extending in the radial direction.

  A cylindrical pin is used for the jig 7 used when the rotation is restricted. The outer diameter of the jig 7 is slightly smaller than the width of the slit formed by the first recess 71 and the second recess 72. The width of the slit formed by the first recess 71 is the distance between the pair of recess inner surfaces 71A. The width of the slit formed by the second recess 72 is the distance between the pair of recess inner surfaces 72A.

  The jig 7 is fitted into the first concave portion 71 and the second concave portion 72 by being inserted into the first concave portion 71 and the second concave portion 72 from the radial direction.

  As shown in FIG. 5, in a state where the jig 7 is fitted over the first recess 71 and the second recess 72, a rotational force is applied to the cover 40 in the direction indicated by the arrow E so that the cover 40 is against the rotary housing 20. When slightly rotated, the jig 7 is sandwiched between the first recess 71 and the second recess 72. Thereby, rotation of the cover 40 with respect to the rotation housing 20 is stopped.

  For example, when the lubricating oil in the gear chamber 19 is changed, a rotational force is applied to the cover 40 via the tool when the plug 9 is turned via the tool and removed. At this time, by inserting the jig 7 into the first recess 71 and the second recess 72 from the radial direction in advance, the jig 7 functions as a rotation regulating member that regulates the rotation of the cover 40 relative to the rotary housing 20. Thereby, it is not necessary to apply a force against the rotational force acting on the cover 40 to the jig 7, the rotation of the cover 40 with respect to the rotary housing 20 is stopped, and the work of detaching the plug 9 can be performed smoothly.

  During the operation of the transmission 200, the jig 7 is removed from the first recess 71 and the second recess 72. For this reason, nothing protrudes from the outer peripheral surface 22 of the rotary housing 20 in the radial direction.

  The jig 7 can also be inserted into the first recess 71 and the second recess 72 from the axial direction.

  According to the second embodiment described above, the effects [1], [2], and [4] are obtained as in the first embodiment, and the following effects are obtained.

  [6] The first recess 71 and the second recess 72 are extended in the radial direction of the rotary housing 20 in a state of being opposed to each other, and constitute a fitting groove into which the jig 7 is fitted.

  When the jig 7 is fitted into the first recess 71 and the second recess 72 constituting the fitting groove, the rotation of the cover 40 relative to the rotary housing 20 is stopped.

  Since the first recess 71 and the second recess 72 have a groove shape extending in the radial direction of the rotary housing 20, the direction in which the jig 7 is inserted into the first recess 71 and the second recess 72 is the radial direction of the rotary housing 20 or Can be inserted from the axial direction.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. Below, it demonstrates centering on a different point from the said 1st Embodiment, the same code | symbol is attached | subjected to the structure which has the substantially same function as the transmission 100 of the said 1st Embodiment, and description is abbreviate | omitted.

  In the transmission 100 according to the first embodiment, the jig 6 functions as a rotation restricting member that fits over the first recess 61 and the second recess 62. On the other hand, in the transmission 300 according to the third embodiment, the jig 8 is inserted into the rotation restricting portion 80 of the rotary housing 20, and the rotation of the rotary housing 20 is stopped by applying a reaction force to the jig 8. It is set as the structure.

  The rotation restricting portion 80 is formed as a polygonal fitting hole in the central portion of the end surface 41 of the cover 40. The rotation restricting portion 80 is configured by a fitting hole having a hexagonal cross section that opens in the end surface 41 of the cover 40. In addition, the port 47 formed in the center part of the end surface 41 of the cover 40 in 1st Embodiment is abolished.

  Further, the rotation restricting portion 80 is not limited to being formed at the central portion of the end surface 41 of the cover 40, and may be formed at a portion other than the central portion of the end surface 41 of the cover 40.

  A hexagonal bar wrench obtained by bending a bar-shaped member having a hexagonal cross section is used as the jig 8 used when the rotation is restricted.

  When the jig 8 is inserted into the central portion of the rotary housing 20 from the axial direction, the tip of the jig 8 is fitted into the rotation restricting portion 80 as shown in FIG. In this state, the operator holds and holds the base end (not shown) of the jig 8, so that the rotation of the cover 40 with respect to the rotary housing 20 is stopped.

  When the transmission 300 is operated, the jig 8 is removed from the rotation restricting portion 80. For this reason, nothing protrudes from the end surface 41 of the cover 40 in the axial direction.

  The cross-sectional shapes of the jig 8 and the rotation restricting portion 80 are not limited to hexagons, and may be other shapes in which the relative rotation of the jig 8 and the rotation restricting portion 80 is locked.

  According to the above 3rd Embodiment, while exhibiting the effect of said [1] and [4] similarly to 1st Embodiment, there exists the effect shown below.

  [7] The rotation restricting portion 80 is a fitting hole that is recessed with respect to the end surface 41 of the cover 40.

  In a state where the jig 8 is fitted to the rotation restricting portion 80 provided on the cover 40, a reaction force opposite to the rotational force applied to the cover 40 is applied to the jig 8, whereby the rotation of the cover 40 with respect to the rotary housing 20 is performed. It can be stopped.

  The rotation restricting portion 80 is not limited to the fitting hole that opens in the end surface 41 of the cover 40, but is a fitting portion (head portion) that protrudes in the axial direction from the bottom surface of the recess that opens in the end surface 41 of the cover 40. Also good. In this case, the jig 8 is a socket wrench.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  In the above embodiment, the retaining mechanism 50 is configured by the wire 4 interposed between the rotary housing 20 and the cover 40, but is not limited thereto, and is not limited to between the rotary housing 20 and the cover 40. It may be configured by a snap ring or the like interposed.

  In the above embodiment, the transmission drives the crawler belt. However, the present invention is not limited to this, and the transmission may be provided in another machine or facility.

  In the above embodiment, the transmission decelerates the output rotation of the shaft and transmits it to the rotating housing. However, the present invention is not limited to this, and the output rotation of the shaft is accelerated and transmitted to the rotating housing. Also good.

6, 7, 8 Jig 10 Transmission mechanism 20 Rotating housing 21 End surface 40 Cover 41 End surface 50 Retaining mechanism 60, 70, 80 Rotation restricting portion 61, 71 First recessed portion 62, 72 Second recessed portion 80 Rotation restricting portion 100, 200 , 300 transmission

Claims (6)

A transmission in which the rotary housing is rotated by a transmission mechanism housed in the rotary housing,
A disc-shaped cover provided at the open end of the rotating housing;
A retaining mechanism for restricting the movement of the cover in the axial direction relative to the rotating housing;
An O-ring that seals between the cover and the rotating housing;
A rotation restricting portion that restricts rotation of the cover relative to the rotating housing by fitting with a jig,
The transmission is characterized in that the O-ring is disposed between the retaining mechanism and the rotation restricting portion in the axial direction of the rotary housing . The retaining mechanism is
An inner circumferential groove formed on the inner circumference of the rotating housing;
An outer peripheral groove formed on the outer periphery of the cover;
The transmission according to claim 1, comprising a wire interposed between the inner circumferential groove and the outer circumferential groove. The rotation restricting portion is
A first recess opening in the rotating housing;
A second recess opening in the cover,
2. The transmission according to claim 1, wherein the jig is fitted over the first concave portion and the second concave portion in a state where the first concave portion and the second concave portion are in positions facing each other . The said 1st recessed part and said 2nd recessed part are extended in the axial direction of the said rotation housing in the state which mutually opposes, and comprise the fitting hole which the said jig | tool fits. 3. The transmission according to 3 . The said 1st recessed part and said 2nd recessed part are extended in the radial direction of the said rotation housing in the state which mutually opposes, and comprise the fitting groove | channel which the said jig | tool fits. 3. The transmission according to 3 . The transmission according to claim 1, wherein the rotation restricting portion is a fitting hole that is recessed with respect to an end surface of the cover .

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