JP5049914B2 - Dog clutch device - Google Patents

Description

  The present invention relates to a dog clutch device having claw portions that mesh with each other and transmitting rotational power.

  The dog clutch device is a device in which the claw portions provided at each end of the pair of rotating shafts mesh with each other to transmit rotational power, and since the structure is simple and reliable power transmission is possible, automobiles, motorcycles, Widely used in tillage machines. In an agricultural machine such as a field cultivator, the rotary shaft on the other input shaft side moves along an arc-shaped track with respect to the rotary shaft on one output shaft side, and these rotary shafts can be connected to each other. A pair of dog clutches (dog clutch devices) have been developed.

  From the viewpoint of improving the ease of coupling of the dog clutch, this dog clutch can guide the movement of the tip of the other claw portion approaching the axially facing surface of the claw portion, thereby enabling the engagement of both claw portions. An inclined surface is formed (see Patent Document 1). The claw portion having the inclined surface is formed with a meshing surface extending in the axial direction of the rotating shaft at the front end portion, and an inclined surface inclined from the front end portion of the meshing surface to the shaft end surface is formed on the upper surface. It is formed in a shape.

  In the dog clutch configured in this way, for example, when one rotary shaft moves along an arcuate track with respect to the other fixed rotary shaft, the tip of one triangular claw portion approaching the One rotating shaft rotates so as to abut against the inclined surface of the other triangular claw portion and is guided by the inclined surfaces of both triangular claw portions, and finally the other triangular portion where one triangular claw portion abuts The pair of dog clutches are connected by meshing with the meshing surface of the triangular claw portion adjacent to the claw portion.

JP-A-8-191609 (paragraphs 0010 to 0014, FIGS. 1 and 2)

  In the conventional dog clutch described in Patent Document 1, since the moving radius of the rotating shaft that moves in an arc shape is relatively large, the claw portion of the dog clutch that is closer to the fixed dog clutch is the fixed dog clutch. When contacting the claw, the moving direction of the approaching dog clutch is substantially the same as the axis of the stationary dog clutch. For this reason, when the moving radius of the rotating shaft that moves in an arc shape is relatively small, it is on the meshing surface side of the claw portion of the approaching dog clutch and on the radially outer end with respect to the rotation center axis of the dog clutch. There is a possibility that the portion contacts the inclined surface of the claw portion of the dog clutch on the fixed side and damages the inclined surface.

  The present invention has been made in view of such a problem, and when the moving radius of the rotating shaft that moves in an arc shape is relatively small, the claw portion of the dog clutch on the side approaching the dog clutch on the fixed side Provided is a dog clutch device that can be reliably connected without the possibility of damaging the dog clutch pawl by the dog clutch pawl on the side approaching the fixed dog clutch even when the pawl is in contact with the pawl of the fixed dog clutch. For the purpose.

In order to solve such a problem, a feature of the present invention is that it is provided at each tip portion of a pair of rotating shafts (for example, the drive shafts 53 and 54 and the driven shaft 62 in the embodiment), and the claw portions are meshed to rotate. a dog clutch device for transmitting the power, of the hand axial facing surface of the claw portion of the dog clutch provided on the rotating shaft of the pair of rotary shaft, a radially outwardly with respect to the rotational center axis of the dog clutch A curved chamfered portion whose surface is convex in the direction of the rotation center axis is formed at the end, and the axially facing surface of the dog clutch pawl portion provided on the other rotation shaft facing the dog clutch having the chamfered portion When the rotating shaft provided with the dog clutch having the chamfered portion is rotated, the chamfered surface is inclined to the inner side in the radial direction with respect to the rotation center axis of the dog clutch. Is to a configuration requirement to move while contacting the upper abutment surface.

  The chamfered portion only needs to be a curved surface having a convex surface. For example, the chamfered portion may be continuously provided with C-shaped surfaces having different R shapes and different inclination angles. A rotating shaft that moves in an arc shape by providing a curved chamfered portion with a convex surface at the radially outer end of the dog clutch claw portion in the axial direction of the dog clutch claw surface. When the moving radius of the dog clutch is relatively small, as the approaching dog clutch approaches the stationary dog clutch, the chamfered portion moves from the radially inner side of the other dog clutch toward the axially opposing surface. . At this time, since the chamfered portion is formed in a curved surface having a convex surface, the chamfered portion that moves in an arc shape does not act to bite into the axially opposed surface of the claw portion of the other dog clutch. . For this reason, a possibility that the claw part of the other dog clutch may be damaged can be prevented.

The other-side rotating shaft which faces the dog clutch having a cut edge (e.g., the drive shaft 53 in the embodiment) the dog clutch provided on (e.g., front drive clutch 10 in the embodiment, the rear drive clutch 11) An abutting surface is formed on the opposite surface of the claw portion in the axial direction so that the chamfered portion abuts against the rotation center axis of the dog clutch in the radial direction . The contact surface may be linear or curved. As the claw portion of the approaching dog clutch approaches the stationary dog clutch, the chamfered portion moves from the radially inner side to the outer side of the other side dog clutch. For this reason, the chamfered portion that abuts against the abutting surface can be easily moved by inclining the abutting surface with which the chamfered portion abuts inward in the radial direction, thereby further preventing the abutment surface from being damaged. can do.

Further, the present invention is characterized in that the dog clutch provided on the other rotary shaft of the pair of rotary shafts is supported so as to be movable in the axial direction of the rotary shaft, and is an elastic body provided between the dog clutch and the rotary shaft. (e.g., a compression spring 53a in the embodiment, 54a) by which that may be biased to a dog clutch side provided on one of the rotating shaft (claim 2). As the approaching dog clutch approaches the stationary dog clutch, when the chamfered portion comes into contact with the axially opposed surface of the claw portion of the other dog clutch, the other dog clutch approaches the spring against the spring. It can evacuate to the side away from. For this reason, the possibility that the claw portion of the other dog clutch with which the chamfered portion abuts can be further prevented.

  According to the dog clutch device of the present invention, having the above-described characteristics, when the moving radius of the rotating shaft that moves in an arc shape is relatively small, the side approaching the dog clutch on the fixed side (the approaching side). It is possible to provide a dog clutch device in which there is no risk of damage to the claw portion of the dog clutch on the fixed side or the claw portion of the fixed side dog clutch.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a dog clutch device according to the present invention will be described with reference to FIGS. First, before explaining the dog clutch device, an outline of a coater equipped with the dog clutch device will be described.

  As shown in FIG. 6 (plan view), the wrinkle coater 50 is connected to a three-point link connecting mechanism (not shown) provided at the rear of the traveling machine body 90 so that the traveling machine body 90 moves forward and backward. In accordance with the above, the paintwork is performed. The wrinkle coater 50 is mounted on the traveling machine body 90 and includes a mounting part 51 having an input shaft to which power from the traveling machine body 90 is input, and a parallel provided on the mounting part 51 and swingable in the mounting part width direction. A link 55, and a glazing operation portion 60 that is disposed so as to be rotatable in a horizontal direction around a rotation fulcrum O provided on the moving end side (rear end side) of the parallel link 55 and performs a glazing operation. Have.

  A transmission frame 61 is provided on the glazing operation portion 60 so as to project, and a front end portion of the transmission frame 61 is pivotally supported by a rear frame 56 provided on the moving end side of the parallel link 55. The hulling work unit 60 can be rotated in the horizontal direction with the pivot position of the rear frame 56 as a pivot fulcrum O, the forward work position Pf offset to one side (right side) of the traveling machine body 90, and the forward work position. It is possible to move between the reverse work position Pb rotated about 180 ° from Pf.

  Two drive shafts 53, 54 that are arranged at a predetermined distance in the longitudinal direction and horizontally project to the rear side are arranged in a rotatable manner in the middle portion in the longitudinal direction of the main frame 52 provided in the mounting portion 51. It is attached with. The drive shaft 53 is disposed substantially directly behind the input shaft so that power from the input shaft can be transmitted through a universal joint (not shown). The drive shaft 54 is configured such that the power transmitted to the drive shaft 53 is transmitted via the drive shaft 53 and a gear attached to the drive shaft 54. For this reason, when power is transmitted to the drive shaft 53, both the drive shafts 53 and 54 rotate. The front drive clutch 10 is attached to the tip of the drive shaft 53 via a compression spring 53a, and the rear drive clutch 11 is attached to the tip of the drive shaft 54 via a compression spring 54a. These drive shafts 53 and 54 extend from the main frame 52 to the rear side with substantially the same distance, and the front drive clutch 10 and the rear drive clutch 11 are arranged at substantially the same distance from the main frame 52 to the rear side. ing.

  On the rotation fulcrum side of the transmission frame 61, a driven shaft 62 extending in the front-rear and horizontal directions at a position closer to the moving end side than the rotation fulcrum O is rotatably supported. The driven shaft 62 is provided so as to penetrate the transmission frame 61 and extends from the front side surface and the rear side surface of the transmission frame 61 with substantially the same length. The front passive clutch 20 is attached to the front end portion of the driven shaft 62, and the rear passive clutch 21 is attached to the rear end portion of the driven shaft 62. The front passive clutch 20 is configured to be connectable to the front drive clutch 10, and the rear passive clutch 21 is configured to be connectable to the rear drive clutch 11.

  The front-side passive clutch 20 swings the parallel link 55 to one side (right side) in the body width direction so that the parallel link 55 is most folded and the wrinkle working unit 60 is centered on the rotation fulcrum O of the traveling body 90. When moved to the forward operation position Pf on one side in the machine body width direction, the front drive clutch 10 is connected (see FIG. 1). Further, the rear side passive clutch 21 rotates the glazing operation portion 60 about 180 ° from the forward operation position Pf around the rotation fulcrum O with the parallel link 55 most folded to one side (right side) in the body width direction. When it is moved to the reverse work position Pb, it is connected to the rear drive clutch 11 (see FIG. 8).

  When the parallel link 55 is swung to one side (right side) in the machine body width direction so that the parallel link 55 is most folded (hereinafter referred to as “working posture”) (see FIG. 6), the wrinkle coating work unit The 60 rotation fulcrums O are configured so as to be positioned approximately at the center between the two drive shafts 53 and 54 in plan view. For this reason, the front passive clutch 20 can be connected to the front drive clutch 10 by moving the hulling work part 60 around the rotation fulcrum O to the forward work position Pf with the parallel link 55 in the working posture. Further, when the hulling work part 60 is moved to the reverse work position Pb around the rotation fulcrum O with the parallel link 55 in the working posture (see FIG. 8), the rear passive clutch 21 is moved to the rear drive clutch 11. Can be connected to.

  The front drive clutch 10 and the front passive clutch 20, and the rear drive clutch 11 and the rear passive clutch 21 are used as a pair, and are configured as a dog clutch device 1. The front drive clutch 10 and the rear drive clutch 11 are formed in the same shape, and the front passive clutch 20 and the rear passive clutch 21 are formed in the same shape. Therefore, the dog clutch device 1 including the front drive clutch 10 and the front passive clutch 20 will be described, and the description of the dog clutch device including the rear drive clutch 11 and the rear passive clutch 21 will be omitted.

  As shown in FIG. 1 (cross-sectional view), the dog clutch device 1 includes a front drive clutch 10 attached to a front end portion of a drive shaft 53 and a front end portion of a driven shaft 62 extending from one side surface of the transmission frame 61. And a front passive clutch 20 mounted on the front side. The front drive clutch 10 and the front passive clutch 20 include pawl clutch members 12 and 22, respectively. The claw clutch members 12 and 22 are shown in FIG. 2 (a) (front view), FIG. 2 (b) (cross-sectional view), FIG. 3 (a) (front view), and FIG. 3 (b) (cross-sectional view). In addition, spline portions 13 and 23 are formed in which the tip portions of the drive shaft 53 and the driven shaft 62 corresponding to the inside of the base portion side are spline-coupled to each other. The end portions 14 and 24 are formed in an annular shape. Three claw portions 15 and 25 are arranged at equal intervals in the circumferential direction on the opposed surfaces on the front end side of the end portions 14 and 24, and meshing surfaces 16 and 26 formed on the circumferential side end portions are engaged with each other. Thus, the rotational force is transmitted.

  As shown in FIGS. 2 (a) and 2 (b), the claw portion 15 of one claw clutch member 12 has meshing surfaces 16 at both ends in the circumferential direction, and the rotation center axis of the claw clutch member 12 This is a protrusion that has a rectangular cross section with respect to L and is formed in a fan shape in a front view. From the viewpoint of preventing the pawl clutch member 12 from escaping, the meshing surface 16 is formed in a reverse taper shape so as to recede inward from the tip portion. Of the axially facing surface 15a of the claw portion 15, a flat portion 15a1 is formed on the radially outer side with respect to the rotation center axis L, and the radially inner side advances radially outward with respect to the inner peripheral surface 15b of the claw portion 15. Accordingly, a contact surface 15a2 that is inclined toward the axially opposed surface side is provided. The contact surface 15a2 may be continuously provided with an R shape or a C surface that is inclined from the radially inner side to the outer side toward the axially facing surface side. In this case, the inclination angle of the adjacent C surface is made smaller on the outer side than on the inner side.

  As shown in FIGS. 3 (a) and 3 (b), the claw portion 25 of the other claw clutch member 22 has engagement surfaces 26 at both ends of the claw portion 25 and has a rectangular cross section in the radial direction. The protrusion is formed in a fan shape when viewed from the front. From the viewpoint of preventing the claw clutch member 22 from escaping, the meshing surface 26 is formed in a reverse taper shape so as to recede inward from the tip portion, and the rotation center axis L of the axially opposed surfaces 25a of the claw portion 25 is formed. On the other hand, an R-shaped chamfered portion 25b having a convex surface is formed on the outer peripheral portion on the radially outer side, and an inclined surface 25c inclined on the surface side of the end portion 24 is formed on the radially inner portion. Is formed. When the claw portions 15 and 25 are in contact with each other and foreign matter such as soil adheres between the claw portions 15 and 25, the inclined surface 25 c This is to suppress the situation in which 15 and 25 are damaged.

  The coupling operation of the dog clutch device 1 that accompanies the movement of the hull coater 60 of the hull coater 50 on which the dog clutch device 1 configured as described above is moved to the forward work position Pf will be described. As shown in FIG. 7 (plan view), when the smearing work unit 60 is rotated counterclockwise with the smearing work part 60 positioned behind the traveling machine body 90 (see FIG. 6), the smearing work is performed. The portion 60 rotates about the rotation fulcrum O, and the front passive clutch 20 also rotates counterclockwise about the rotation fulcrum O.

  Then, when the haze application unit 60 moves to the vicinity of the forward operation position Pf (see FIG. 6), the front passive clutch 20 is counterclockwise about the rotation fulcrum O as shown in FIG. The chamfered portion 25b of the claw portion 25 of the front passive clutch 20 comes into contact with the contact surface 15a2 of the claw portion 15 of the front drive clutch 11 by rotating and approaching the front drive clutch 10.

  Then, as the glazing operation portion 60 further rotates, as shown in FIG. 4B, the chamfered portion 25b slides on the contact surface 15a2, and the outer periphery of the axially facing surface 15a of the contact surface 15a2. And the front drive clutch 10 is urged in the drive shaft direction. As a result, the front drive clutch 10 moves toward the drive shaft against the biasing force of the compression spring 53a.

  Here, since the chamfered portion 25b is formed in a curved surface having a convex surface, when the chamfered portion 25b rotates counterclockwise around the rotation fulcrum O of the transmission frame 61, the contact surface 15a2 is formed. Move (slide) while making line contact on the top. For this reason, the chamfered portion 25b stops on the contact surface 15a2, and most of the force that the chamfered portion 25b acts on the contact surface 15a2 does not act on the contact surface 15a2, and the chamfered portion 25b and the contact surface 15a2 There is no risk of damage.

  When the chamfered portion 25b moves on the axially facing surface 15a on the radially inner side, the chamfered portion 25b moves on the axially facing surface 15a while urging the axially facing surface 15a obliquely forward as shown in FIG. As shown in FIG. 4C, the claw portions 25 and 15 of the front drive clutch 10 and the front passive clutch 20 come into contact with each other as shown in FIG. 4C.

  When the claws of the front drive clutch 10 and the front passive clutch 20 come into contact with each other, the front drive clutch 10 is further pushed from the front passive clutch 20 and driven against the compression spring 53a (see FIG. 4B). It further moves to the shaft 53 side.

  In this state, when either the drive shaft 53 to which the front drive clutch 10 is attached or the driven shaft 62 (see FIG. 1) to which the front passive clutch 20 is attached rotates, the front drive is performed by the restoring force of the compression spring 53a in the compressed state. The clutch 10 moves to the front passive clutch 20 side, and the claw portions 15 and 25 of the both claw clutch members 12 and 22 mesh with each other, and the coupling operation of the dog clutch device 1 is completed. Even when the claws are in contact with each other, the inclined surface 25c is formed on the inner side of the axially facing surface 25a of the claw portion 25 of the front passive clutch 20. It becomes small and can prevent the nail | claw parts 25 and 15 from being damaged by the engagement of a foreign material.

  Note that, when the hulling work unit 60 is moved from the forward work position Pf to the reverse work position Pb (see FIG. 8), the action of coupling the rear passive clutch 21 to the rear drive clutch 11 is the aforementioned front passive clutch. Since it is based on the effect | action which couple | bonds 20 to the front side drive clutch 10, the description is abbreviate | omitted.

The top view of a dog clutch apparatus in the state where a pair of pawl clutch members were combined is shown. 1 shows one dog clutch of a dog clutch device according to an embodiment of the present invention, in which FIG. 1 (a) is a front view of a claw clutch member, and FIG. 2 (b) is a view taken along arrows II-II in FIG. 1 (a). FIG. The other dog clutch of the dog clutch apparatus concerning one Embodiment of this invention is shown, The figure (a) is a front view of a nail | claw clutch member, The figure (b) is the III-III arrow view in the figure (a). FIG. The top view of the dog clutch apparatus for demonstrating the coupling | bonding operation | movement of a dog clutch apparatus is shown. The top view of the dog clutch apparatus which drew the locus | trajectory of one dog clutch in order to demonstrate the coupling | bonding operation | movement of a dog clutch apparatus is shown. The top view of the hulling machine which mounted the dog clutch apparatus and the hulling work part moved to the advance work position is shown. FIG. 3 is a plan view of the coater in a state where the dog clutch device is mounted and the coater unit is positioned between the forward work position and the reverse work position. The top view of the hulling machine which mounted the dog clutch apparatus and the hulling work part moved to the reverse work position is shown.

Explanation of symbols

1 Dog clutch device 10 Front drive clutch (dog clutch)
11 Rear drive clutch (dog clutch)
15, 25 Claw portions 15a, 25a Axial facing surface 15a2 Abutting surface 20 Front passive clutch (dog clutch)
21 Rear passive clutch (dog clutch)
25 Claw portion 25a Axial facing surface 25b Chamfered portion 53, 54 Drive shaft (rotating shaft)
53a, 54a Compression spring 62 Driven shaft (rotating shaft)
L Rotation center axis

Claims (2)

A dog clutch device that is provided at each tip of a pair of rotating shafts and that engages the claws to transmit rotational power,
Of axial facing surface of the claw portion of the dog clutch provided on the rotating shaft of the hand of the pair of rotary shafts, the ends of the radially outwardly with respect to the rotational center axis of the dog clutch, the surface rotation center axis line direction A curved chamfered portion that is convex is formed on the axially opposed surface of the dog clutch pawl portion provided on the other rotation shaft facing the dog clutch having the chamfered portion, on the rotation center axis of the dog clutch. In contrast, a contact surface that is inclined radially inward and contacts the chamfered portion is formed,
When the rotation shaft provided with the dog clutch provided with the chamfered portion rotates, the chamfered portion moves while contacting the contact surface.
Dog clutch and wherein a call. Dog clutch provided on the other of the rotational axis of the pair of rotary shaft, while being movably supported in the axial direction of the rotary shaft, one of the elastic body provided between the rotary shaft and the dog clutch that is biased to the dog clutch side provided on the rotary shaft
Dog clutch device according to claim 1, wherein the this.

Images