JP5583625B2 - Multi-stage transmission assembly and disassembly jig - Google Patents

Description

  The present invention relates to a jig for assembling and disassembling a constantly meshing multi-stage transmission.

A plurality of drive gears m and driven gears n are respectively supported by gear shafts 11 and 12 parallel to each other in a constantly meshed state for each shift stage, and one of the plurality of gears m of the drive gear m and the driven gear n is connected to the gear shaft 11. And an engagement switching mechanism 20 that switches the engagement of the gear shaft 12 and each gear n between the other plurality of gears n and the gear shaft 12 for each gear by the swinging of the swinging claw member R. The multi-stage transmission 10 in which the control rod 51 of the speed change drive mechanism 50 moves in the axial direction within the gear shaft 12 and the swinging claw member R of the engagement switching mechanism 20 is swung to shift the speed. There is an example of an earlier application by the same applicant (see Patent Document 1).

JP 2010-078048 A

  An engagement switching mechanism 20 such as a rocking claw member R must be incorporated in the gear shaft 12 and each gear n must be pivotally supported around the gear shaft 12, but in Patent Document 1, assembly and disassembly are not performed without using a special jig. I was going.

Therefore, when assembling, the engagement switching mechanism 20 such as the swinging claw member R is incorporated in the gear shaft 12 at every first gear stage, and the operation of fitting one gear n is sequentially repeated and assembled. In the same manner, the operation of pulling out one gear n from the gear shaft 12 and removing the engagement switching mechanism 20 for each first gear is sequentially disassembled while being repeated.
For this reason, assembly and disassembly are extremely complicated operations, which require time and labor.

  The present invention has been made in view of the above points, and the object of the present invention is to provide a jig that facilitates assembly and disassembly of the multi-stage transmission.

In order to achieve the above object, the invention according to claim 1
A first gear shaft (11) that rotatably supports the first gear (m) group;
A second gear which is provided in parallel to the first gear shaft (11) and rotatably supports a second gear (n) group which always meshes with the first gear (m) group and has a hollow portion at the shaft center. The axis (12),
The second gear shaft (12) is supported in a swingable manner and is urged by a spring (22) so that the engaging claw portion (Rp) protrudes from the outer peripheral surface of the second gear shaft (12). (n) A swinging claw member that engages with an engaging projection (31) formed on the inner peripheral surface of the group and rotates the second gear shaft (12) and the second gear (n) group integrally. (R) and
The engaging claw portion (Rp) of the swinging claw member (R) provided so as to be able to advance and retreat from the axial center side of the second gear shaft (12) to the outer periphery of the second gear shaft (12). A pin member (23) to be pushed back inward from the surface,
A cam rod (C) provided in a hollow portion of the second gear shaft (12) so as to be slidable in the axial direction and having a cam groove for moving the pin member (23) forward and backward;
A control rod (51) for moving the cam rod (C) in the axial direction;
In the assembly and disassembly jig of the multi-stage transmission equipped with
Instead of the cam rod (C) and the control rod (51), the pin member (23) is inserted into the hollow portion of the second gear shaft (12) so that the outer peripheral direction of the second gear shaft (12). The engaging claw portions (Rp) of all the swinging claw members (R) pushed out to the inside from the outer peripheral surface of the second gear shaft (12) are pushed back inwardly to all the second gear (n) groups and the A counter rod (85) for releasing the engagement of the swing claw member (R);
When the engaging claw portion (Rp) of the swing claw member (R) is projected from the outer peripheral surface of the second gear shaft (12) while being fitted to the outer peripheral surface of the second gear shaft (12). An outer collar (90) provided with a hole (90h) through which the engaging claw portion (Rp) can enter,
A jig for assembling and disassembling a multi-stage transmission, comprising:

The invention according to claim 2 is the assembly and disassembly jig for the multi-stage transmission according to claim 1,
A hollow bottom wall (91b) is formed at the small diameter end of the conical cylindrical peripheral wall (91a), and a gear holder surrounds the second gear (n) group supported by the second gear shaft (12). 91) and
A lid member (92) for accommodating the second gear (n) group inside the gear holder (91) and locking the lid to a large-diameter opening end of the gear holder (91); Features.

The invention according to claim 3 is a jig for assembling and disassembling the multi-stage transmission according to claim 1 or 2,
A shift rod holder ( 82 ) surrounding the periphery in a state where the cam rod (C) is assembled to the control rod (51) is provided.

The invention according to claim 4 is a jig for assembling and disassembling the multi-stage transmission according to claim 2,
A cylindrical main body (87a) having the same outer diameter as the second gear shaft (12); the outer collar (90) is set on the outer periphery of the cylindrical main body; and the inner end of the cylindrical main body (87a) A first holder base (87) having a flange (87c) for holding the end of the counter rod (85) is provided on the periphery.

The invention according to claim 5 is a jig for assembling and disassembling a multi-stage transmission according to any one of claims 1 to 4,
An opening having a cylindrical main body (100a) fitted to the outer periphery of the second gear shaft (12) and exposing one of the swinging claw members (R) at one opening end of the cylindrical main body (100a). A ratchet set holder (100) in which a portion (100c) is cut out is provided.

  According to the assembly and disassembly jig of the multi-stage transmission according to claim 1, the counter rod (85) is placed in the hollow portion of the second gear shaft (12) instead of the cam rod (C) and the control rod (51). When inserted, all the swinging claw members (R) built into the second gear shaft (12) can keep the engaging claw part (Rp) retracted from the outer peripheral surface. The second gear (n) group can be assembled or removed all at once, and the outer collar (90) has a rocking claw member (R) incorporated in the second gear shaft (12) on the outer peripheral surface. The more protruding engagement claw (Rp) can be inserted into the hole and locked to fit the outer peripheral surface of the second gear shaft (12), and used in combination with the counter rod (85) The second gear shaft (12) can be installed or removed in place of the second gear (n) group to facilitate the assembly and disassembly of the multi-stage transmission. It can be.

  According to the jig for assembling and disassembling the multi-stage transmission according to claim 2, the gear holder (91) in which the hollow bottom wall (91b) is formed at the small diameter end of the conical cylindrical peripheral wall (91a), Since the second gear (n) group can be accommodated inside and the large-diameter opening end can be covered with the lid member (92), the second gear (n) group can be handled integrally and the second gear shaft ( 12) Simplifies installation and removal, and facilitates assembly and disassembly work of multi-stage transmission.

According to the assembly and disassembly jig for the multi-stage transmission according to claim 3, the shift rod holder ( 82 ) can surround the cam rod (C) with the control rod (51) attached to the periphery. , Can be handled with the cam rod (C) connected to the control rod (51), and can be easily inserted into and removed from the hollow portion of the second gear shaft (12) to improve assembly / disassembly workability. .

  According to the assembly and disassembly jig for the multi-stage transmission according to claim 4, the first holder base (87) sets the outer collar (90) on the outer periphery of the cylindrical body (87a), and the cylindrical body (87a) Since the flange portion (87c) on the inner periphery of the end portion holds the end portion of the counter rod (85), the counter rod (85) held by the first holder base (87) is attached to the second gear shaft (12). By inserting the cylindrical body (87a) coaxially with the second gear shaft (12) after being inserted into the hollow portion, the second gear (n) group supported on the second gear shaft (12) and the cylindrical body ( The outer collar (90) set on the outer periphery of 87a) can be easily replaced.

  According to the jig for assembly and disassembly of the multi-stage transmission according to claim 5, the ratchet set holder (100) is fitted to the outer periphery of the second gear shaft (12), and the outer peripheral surface of the second gear shaft (12). Align the opening (100c) with the position where the swinging claw member (R) is to be attached, and attach the swinging claw member (R) from the opening (100c) to the second gear shaft (12). (100) can be rotated or moved in the axial direction, and the next swinging claw member (R) can be attached in sequence, so that the already installed swinging claw member (R) can be held by the cylindrical body. It is possible to facilitate the assembly work of the swinging claw member (R) to the second gear shaft (12), and to perform the work smoothly and promptly.

It is sectional drawing of the multistage transmission which concerns on one embodiment of this invention. It is sectional drawing (II-II sectional view taken on the line of FIG. 4, FIG. 5) which shows a counter gear shaft and the structure around it. It is another sectional view (III-III line sectional view of Drawing 4 and Drawing 5) which shows a counter gear shaft and the structure around it. FIG. 4 is a sectional view taken along line IV-IV in FIGS. 2 and 3. FIG. 5 is a cross-sectional view taken along line VV in FIGS. 2 and 3. It is a disassembled perspective view of a control rod and a lost motion mechanism. FIG. 5 is an exploded perspective view of a state in which a lost motion mechanism is assembled to a control rod and a cam rod and the like. It is a disassembled perspective view of a part of a counter gear shaft, a pin member, and a spring. FIG. 9 is a left side view of the counter gear shaft (a view taken along arrow IX in FIG. 8). It is a disassembled perspective view of a rocking claw member, a spindle pin, a pin member, and a spring. It is a perspective view which shows the state which assembled | attached a part of speed-change drive means and the engagement means to the control rod. FIG. 12 is a perspective view showing a state in which one bearing collar member is packaged on the counter gear shaft in the state shown in FIG. 11. It is sectional drawing which shows the counter gear shaft just before completion of the upshift to the 2nd speed and the structure around it. It is the XIV-XIV sectional view taken on the line of FIG. It is the XV-XV sectional view taken on the line of FIG. It is a figure for demonstrating the disassembly work of the beginning of the disassembly procedure of a multistage transmission. It is a figure for demonstrating the next disassembly work. It is a figure for demonstrating the next disassembly work. It is a figure for demonstrating the next disassembly work. It is a figure for demonstrating the next disassembly work. It is a figure for demonstrating the next disassembly work. It is a figure for demonstrating the next disassembly work. It is a figure for demonstrating the next disassembly work. It is a figure for demonstrating the next disassembly work. It is a figure for demonstrating the next disassembly work. It is a figure for demonstrating the next disassembly work. It is a figure for demonstrating the next disassembly work. It is a figure for demonstrating the next disassembly work. It is a figure for demonstrating the next disassembly work. It is a figure for demonstrating the assembly work of the beginning of the assembly procedure of a multistage transmission. It is a figure for demonstrating the next assembly operation. It is a figure for demonstrating the next assembly operation. It is a figure for demonstrating the next assembly operation. It is a figure for demonstrating the next assembly operation.

Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.
First, a multi-stage transmission 10 applied to the present embodiment will be described with reference to FIGS.
The multi-stage transmission 10 is configured to be incorporated in an internal combustion engine mounted on a motorcycle.

FIG. 1 is a cross-sectional view of the multi-stage transmission 10. As shown in FIG. 1, the multi-stage transmission 10 is provided in an engine case 1 that is common to an internal combustion engine.
The engine case 1 formed by combining the left engine case 1L and the right engine case 1R which are divided into left and right forms a transmission chamber 2, in which the main gear shaft 11 and the counter gear shaft 12 are parallel to each other. The shaft is supported so as to be rotatable in the left-right direction.

  The main gear shaft 11 is rotatably supported by bearings 3L and 3R on a side wall of the left engine case 1L and a separate side wall 1RR of the right engine case 1R, and protrudes from the transmission chamber 2 through the right bearing 3R. A multi-plate friction clutch 5 is provided at the right end.

On the left side of the friction clutch 5, a primary driven gear 4 to which rotation of a crankshaft (not shown) is transmitted is rotatably supported by the main gear shaft 11.
The rotation of the crankshaft of the internal combustion engine is transmitted from the primary driven gear 4 to the main gear shaft 11 via the engaged friction clutch 5.

  On the other hand, the counter gear shaft 12 is also rotatably supported on the side wall of the left engine case 1L and the side wall 1RR of the right engine case 1R via bearings 7L and 7R, and protrudes from the transmission chamber 2 through the left bearing 7L. An output sprocket 32 is spline-fitted to the left end and is secured by a cap nut 37 and attached.

  A drive chain 38 that is wound around the output sprocket 32 is wound around a sprocket that drives a rear wheel (not shown) at the rear, and the rotational power of the counter gear shaft 12 is transmitted to the rear wheel so that the vehicle travels.

On the main gear shaft 11, a drive transmission gear m group is configured between the left and right bearings 3L, 3R so as to be rotatable integrally with the main gear shaft 11.
A first drive transmission gear m1 is formed integrally with the main gear shaft 11 along the right bearing 3R, and a spline formed between the first drive transmission gear m1 of the main gear shaft 11 and the left bearing 3L is viewed from the right. The second, third, fourth, fifth, and sixth drive transmission gears m2, m3, m4, m5, and m6, whose diameters are sequentially increased to the left, are spline-fitted.

On the other hand, on the counter gear shaft 12, a group of driven transmission gears n is rotatably supported via an annular bearing collar member 13 between the left and right bearings 7L and 7R.
In the counter gear shaft 12, a right end bearing collar member 13 is provided through a washer 14R interposed on the left side of the right bearing 7R, and is provided through a washer 14L provided on the right side of the left bearing 7L. Between the bearing collar member 13 at the left end, five bearing collar members 13 are externally equidistantly spaced from the right so as to straddle between the adjacent bearing collar members 13, 13 of the seven bearing collar members 13 in total. First, second, third, fourth, fifth, and sixth driven transmission gears n1, n2, n3, n4, n5, and n6, whose diameters are sequentially reduced to the left, are rotatably supported.

  The first, second, third, fourth, fifth, and sixth drive transmission gears m1, m2, m3, m4, m5, and m6 that rotate integrally with the main gear shaft 11 are rotatable on the counter gear shaft 12. The corresponding first, second, third, fourth, fifth and sixth driven transmission gears n1, n2, n3, n4, n5 and n6 are always meshed with each other.

  The meshing of the first drive transmission gear m1 and the first driven transmission gear n1 constitutes the first speed with the largest reduction ratio, and the meshing of the sixth drive transmission gear m6 and the sixth driven transmission gear n6 has the smallest reduction ratio. Sixth speed is configured, and during that period, the reduction gear ratio is gradually decreased to form second speed, third speed, fourth speed, and fifth speed.

  The counter gear shaft 12 has odd-numbered gears (first, third, and fifth driven gears n1, n3, and n5) with odd-numbered gears and even-numbered gears (second, fourth, and fourth) with even-numbered gears. 6 driven transmission gears n2, n4, n6) are alternately arranged.

  The counter gear shaft 12 having a hollow cylindrical shape is incorporated so that the engagement means 20 that can be engaged with each driven transmission gear n will be described later. A total of eight cam rods C (Cao, Cao, Cae, Cae, Cbo, Cbo, Cbe, Cbe) are formed in the hollow inner peripheral surface of the counter gear shaft 12 and fit into a cam guide groove 12g described later. In addition, they are provided so as to be movable in the axial direction.

  A control rod 51, which is one component of the speed change driving means 50 that drives the cam rod C to change the speed, is inserted into the hollow central axis of the counter gear shaft 12, and the movement of the control rod 51 in the axial direction is lost motion. The cam rod C is moved in the axial direction in conjunction with each other via the mechanisms 52 and 53.

A mechanism for moving the control rod 51 in the axial direction is provided in the right engine case 1R.
The movement of the control rod 51 in the axial direction interlocks the cam rod C in the axial direction via the lost motion mechanisms 52 and 53, and the movement of the cam rod C is changed to each driven speed change by the engaging means 20 incorporated in the counter gear shaft 12. The gear n is selectively engaged with the counter gear shaft 12 for shifting.

Referring to FIG. 6, the control rod 51 of the speed change drive means 50 has a cylindrical rod shape, and outer peripheral recesses 51a and 51b formed by reducing the diameter in two axial positions on the left and right sides respectively over a predetermined length. Is formed.
The right end of the control rod 51 is a male screw end portion 51bb formed with a male screw, and a hexagonal nut portion 51c is formed in front of the male screw end portion 51bb.

The lost motion mechanisms 52 and 53 are assembled corresponding to the left and right outer peripheral recesses 51a and 51b of the control rod 51, respectively.
The left and right lost motion mechanisms 52 and 53 have the same structure on the left and right.

The left lost motion mechanism 52 has a spring holder 52h into which a control rod 51 is slidably inserted and is configured by connecting a long holder 52hl and a short holder 52hs, and corresponds to the outer peripheral recess 51a of the control rod 51 on the inner peripheral surface. An inner peripheral recess 52ha is formed.

  When the control rod 51 is passed through the spring holder 52h and the spring holder 52h is positioned in the outer peripheral recess 51a, the inner peripheral recess 52ha of the spring holder 52h and the outer peripheral recess 51a of the control rod 51 constitute a common space. To do.

A pair of left and right cotters 52c and 52c, which are spring receivers, are fitted oppositely so as to straddle both spaces of the inner peripheral recess 52ha of the spring holder 52h and the outer peripheral recess 51a of the control rod 51, and the control is performed between the two cotters 52c and 52c. A compression coil spring 52 s wound around the rod 51 is interposed to urge both the cotters 52 c and 52 c in a separating direction.
The cotter 52c has a hollow disk shape in which the inner diameter of the inner peripheral recess 52ha of the spring holder 52h is the outer diameter, and the outer diameter of the outer peripheral recess 51a of the control rod 51 is the inner diameter. Yes.

The lost motion mechanism 53 on the right side (spring holder 53h, long holder 53hl, short holder 53hs, inner peripheral recess 53ha, cotter 53c, compression coil spring 53s) has the same structure and is disposed in the outer peripheral recess 51b of the control rod 51. The
Therefore, when the control rod 51 moves in the axial direction, the spring holders 52h, 53h move in the axial direction via the compression coil springs 52s, 53s of the left and right lost motion mechanisms 52, 53.

  Eight cam rods C (Cao, Cao, Cae, Cae, Cbo, Cbo) are provided on the outer peripheral surfaces of the spring holders 52h, 53h of the lost motion mechanisms 52, 53 attached to the left and right outer peripheral recesses 51a, 51b of the control rod 51. , Cbe, Cbe) are in contact with each other at the radiation position (see FIG. 7).

The cam rod C is a rectangular rod-like member having a rectangular cross section and extending in the axial direction. The outer peripheral side opposite to the inner peripheral side contacting the spring holders 52h, 53h forms a cam surface, and the cam surface Grooves v are formed at the required three locations, and a pair of locking claws p that locks either one of the spring holders 52h and 53h from the left and right protrude from the inner peripheral side surface.
Since the cam rod C is a rectangular prismatic member having a simple cross section and a generally simple outer shape, the cam rod C can be easily manufactured.

  The cam rods Cao, Cbo for odd-numbered stages formed with cam grooves v1, v3, v5 at three positions corresponding to the odd-numbered stage gears (first, third, fifth driven transmission gears n1, n3, n5) There are two types of rotation (rotation direction in which force is applied from the driven transmission gear n to the counter gear shaft 12 during acceleration) and reverse rotation (rotation direction in which force is applied from the driven transmission gear n to the counter gear shaft 12 during deceleration). One forward rotation odd-stage cam rod Cao has an engaging claw p that engages with the right spring holder 53h on the inner peripheral side, and the other reverse rotation odd-stage cam rod Cbo has a left spring holder 52h on the inner peripheral side. There is a locking claw p that locks to (see FIG. 7).

  Similarly, cam rods Cae for even-numbered stages formed at three positions corresponding to even-numbered gears (second, fourth and sixth driven transmission gears n2, n4, n6) with even-numbered gear grooves v2, v4, v6. , Cbe are of two types, forward rotation and reverse rotation, and one forward rotation even-stage cam rod Cae has a locking claw p that locks to the left spring holder 52h on the inner peripheral side, The reverse rotation even-stage cam rod Cbe has a locking claw p that locks to the right spring holder 53h on the inner peripheral side surface (see FIG. 7).

  Accordingly, when the control rod 51 is moved in the axial direction, the positive rotation odd-numbered cam rod Cao and the reverse-rotating even-numbered cam rod Cbe are linked in the axial direction together with the spring holder 53h via the compression coil spring 53s of the lost motion mechanism 53 on the right side. Then, the reverse rotation odd stage cam rod Cbo and the forward rotation even stage cam rod Cae are interlocked in the axial direction together with the spring holder 52h via the coil spring 52s of the left lost motion mechanism 52.

  As shown in FIG. 7, a cylindrical control rod operating element 55 is attached to the right end portion on the right side of the nut portion 51c of the control rod 51 via a ball bearing 56 fitted inside.

  Two ball bearings 56 are connected in the axial direction. The ball bearings 56 are inserted into the right end portion on the right side of the nut portion 51c of the control rod 51, and are engaged with the nut portion 51c by a nut 57 screwed into the male screw end portion 51bb. It is sandwiched and fastened.

Therefore, the control rod operator 55 holds the right end portion of the control rod 51 rotatably.
A pin hole 55h pierced in the diametrical direction is formed in a cylindrical portion extending to the right side of the nut 57 to which the control rod operating element 55 is screwed, and the shift pin 58 penetrates the pin hole 55h.

The shift pin 58 passes through the control rod operating element 55 and protrudes only to one side (see FIG. 2). As shown in FIG. 14, the protruding end portion is formed in a shift guide groove G of the shift drum 67 described later. A cylindrical engaging portion 58a that slidably engages, and a rectangular parallelepiped sliding portion 58b is formed between the small-diameter cylindrical portion 58c that penetrates the control rod operating element 55 and the engaging portion 58a. Yes.
A groove 60 is formed in the guide portion 1Ra projecting to the right of the side wall 1RR of the right engine case 1R so as to be directed in the left-right direction. A sliding portion 58b having a rectangular parallelepiped shape of the shift pin 58 is slid in the groove 60. The shift pin 58 is prevented from rotating by fitting freely.

  A support shaft 65 is implanted in the side wall 1RR so as to protrude rightward, and a shift drum 67 is rotatably supported on the support shaft 65 via a bearing 66. A shift groove 67v of the shift drum 67 is provided. In addition, the protruding engaging portion 58a of the shift pin 58 is slidably fitted.

  The shift groove 67v of the shift drum 67 is formed so as to draw a spiral on the outer peripheral surface of the drum, and each gear position from the first speed to the sixth speed at every predetermined rotation angle (for example, 60 degrees) therebetween. And the neutral position is formed in the middle.

Therefore, the rotation of the shift drum 67 moves the shift pin 58 fitted in the shift groove 67v together with the control rod operator 55 in the axial direction.
Since the control rod operating element 55 holds the right end portion of the control rod 51 rotatably, the rotation of the shift drum 67 eventually moves the control rod 51 in the axial direction.

The shift drum 67 is rotated via shift transmission means (not shown) by manual operation of a shift select lever (not shown).
The shift transmission means is provided with a mechanism such as a shift cam member that stably holds the shift drum 67 at the gear position for each predetermined angle, and the operation power of the shift select lever is transmitted to a gear 67g formed on the side edge of the shift drum 67. Then, the shift drum 67 is sequentially rotated to the gear position.
The shift drum 67 may be rotated by a speed change motor.

  As described above, the shift drive means 50 has the shift pin 58 in which the shift drum 67 is rotated by manual operation of the shift select lever (or driving of the shift motor), and the rotation of the shift drum 67 is fitted in the shift groove 67v. The movement of the shift pin 58 moves the control rod 51 in the axial direction via the control rod operator 55, and the movement of the control rod 51 engages via the lost motion mechanisms 52 and 53. The eight cam rods Cao, Cao, Cae, Cae, Cbo, Cbo, Cbe, and Cbe of the means 20 are interlocked.

The control rod 51 assembled with the lost motion mechanisms 52 and 53 is inserted into the hollow of the counter gear shaft 12 and disposed on the central shaft.
The hollow cylindrical counter gear shaft 12 has an inner diameter substantially equal to the outer diameter of the spring holders 52h and 53h of the lost motion mechanisms 52 and 53, and the spring holders 52h and 53h attached to the control rod 51 are slidably fitted. Insert.

Then, eight cam guide grooves 12g having a rectangular cross section are formed extending in the axial direction at eight radial positions on the hollow inner peripheral surface of the counter gear shaft 12 (see FIG. 9).
The eight cam rods Cao, Cao, Cae, Cae, Cbo, Cbo, Cbe, and Cbe are slidably fitted into the corresponding cam guide grooves 12g in the arrangement shown in FIG.
The same kind of cam rod C is disposed at a symmetrical position.
The cam guide groove 12g, which serves as a detent for the cam member C with respect to the counter gear shaft 12, has a simple U-shaped cross section and can be easily machined.

  The cam guide groove 12g has a depth equal to the radial width of the cam rod C. Therefore, the cam surface which is the outer peripheral side surface of the cam rod C is in sliding contact with the bottom surface of the cam guide groove 12g, and the inner peripheral side surface is substantially the same as the hollow inner peripheral surface. A locking claw p which forms a surface and contacts the outer peripheral surface of the spring holders 52h and 53h and protrudes from the inner peripheral side surface grips either of the spring holders 52h and 53h from both sides.

  The counter gear shaft 12 having a hollow cylindrical shape includes a left cylindrical portion 12b and a right cylindrical portion whose outer diameters are reduced on both the left and right sides of the central cylindrical portion 12a on which the driven transmission gear n is pivotally supported via a bearing collar member 13. 12c is formed (see FIG. 8).

A bearing 7L is fitted to the left cylindrical portion 12b of the counter gear shaft 12 via a washer 14L, while a bearing 7R is fitted to the right cylindrical portion 12c via a washer 14R (FIGS. 1, 2). (See FIG. 3).
The shaft end of the left cylindrical portion 12b of the counter gear shaft 12 is reduced in outer diameter to form a male screw 12e. A spline groove 12s into which the output sprocket 32 is spline-fitted on the inner side in the axial direction of the male screw 12e. Is formed.

In the hollow of the counter gear shaft 12, the inner diameter of the small-diameter inner surface where the cam guide groove 12g is formed is equal to the outer diameter of the spring holders 52h, 53h, and the inner diameters on both sides of the small-diameter inner peripheral surface are the cam guide grooves 12g. A large-diameter inner peripheral surface that forms substantially the same peripheral surface as the bottom surface is formed (see FIGS. 2 and 3).
About half of the control rod operating element 55 is inserted inside the enlarged inner diameter part on the right side.

  Thus, when the control rod 51, the lost motion mechanisms 52 and 53, and the eight cam rods Cao, Cao, Cae, Cae, Cbo, Cbo, Cbe, and Cbe are incorporated into the hollow of the counter gear shaft 12, all of these are incorporated. When the control rod 51 rotates together in the axial direction, the reverse rotation odd-numbered cam rod Cbo and the forward rotation even-numbered cam rod Cae are linked in the axial direction via the coil spring 52s of the left lost motion mechanism 52, and the right side Through the coil spring 53s of the lost motion mechanism 53, the forward rotation odd stage cam rod Cao and the reverse rotation even stage cam rod Cbe are interlocked in the axial direction.

  Since the lost motion mechanisms 52 and 53 are arranged in the axial direction of the counter gear shaft 12 and interposed between the outer peripheral surface of the control rod 51 and the inner surfaces of the plurality of cam rods C, the lost motion mechanisms 52 and 53 are located in the hollow of the counter gear shaft 12. The control rod 51, the lost motion mechanism 52, 53, and the cam rod C are overlapped in the radial direction to avoid the expansion of the multi-stage transmission 10 in the axial direction, and the lost motion mechanism 52, 53 can be compactly accommodated in the hollow of the counter gear shaft 12. The housing can be accommodated to reduce the size of the multi-stage transmission 10 itself.

  Two lost motion mechanisms 52 and 53 are provided on the control rod 51 in the axial direction, and each lost motion mechanism 52 and 53 is linked to another cam rod C. The cam rod C can be made to perform two different types of movements to make the speed change smooth, and the lost motion mechanisms 52 and 53 have the same structure to reduce the manufacturing cost and facilitate the management of parts during assembly.

  Lost motion mechanisms 52 and 53 are interposed between the outer peripheral surface of the control rod 51 and the inner surfaces of the plurality of cam rods C. The inner peripheral recesses 52ha and 53ha of the spring holders 52h and 53h and the outer peripheral recess 51a of the control rod 51 Since the coil springs 52 s and 53 s are interposed in the space formed by 51 b, the lost motion mechanisms 52 and 53 having the same shape can be configured on the control rod 51.

  The lost motion mechanism 52 (53) is a split cotter with the cotter 52c divided in half, and the spring holder 52h (53h) is divided into a long holder 52hl (53hl) and a short holder 52hs (53hs). Even if the diameter-enlarged stopper 51as (51bs) is formed at the axial center of the outer peripheral recess 51a (51b) of the control rod 51, the spring holder 52h (53h) can be easily provided by arranging split cotters 52c on both side recesses. As a result, the lost motion mechanism 52 (53) can be easily assembled.

  As shown in FIG. 8, the central cylindrical portion 12a on which the driven transmission gear n is pivotally supported via the bearing collar member 13 of the counter gear shaft 12 has a large outer diameter and is configured to be thick. A narrow circumferential groove 12cv that goes around in the circumferential direction on the outer periphery corresponds to the first, second, third, fourth, fifth, and sixth driven transmission gears n1, n2, n3, n4, n5, and n6. In addition, six axial grooves 12av are formed at equal intervals in the axial direction, and four axial grooves 12av oriented in the axial direction are formed at equal intervals in the circumferential direction.

  Further, on the outer peripheral portion of the central cylindrical portion 12a of the counter gear shaft 12, four portions defined by four axial grooves 12av are adjacent to each other in the circumferential direction. A long rectangular recess 12p that is elongated equally between the grooves 12av and 12av in the left and right direction, and a short length in which the groove width of the circumferential groove 12cv is evenly enlarged in the left and right directions in part between the adjacent axial grooves 12av and 12av. Rectangular recesses 12q are alternately formed in the axial direction.

Spring receiving portions 12d and 12d are formed in two axially elongated oval shapes in the axial direction and slightly recessed over the circumferential groove 12cv at two locations on the bottom surface of the long rectangular recess 12p.
Further, a pin hole 12h is formed in the radial direction up to the cam guide groove 12g on the circumferential groove 12cv at a thick portion between the short rectangular recess 12q and the axial groove 12av.

That is, the pin hole 12h is drilled in the radial direction of the cam guide groove 12g formed at eight locations in the circumferential direction from the hollow inner peripheral surface of the counter gear shaft 12.
Four pin holes 12h are formed on each circumferential groove 12cv.

The spring receiving portion 12d is provided with a compression spring 22 wound in an elliptical shape with its end fitted.
A pin member 23 is slidably inserted into the pin hole 12h.
The cam guide groove 12g communicating with the pin hole 12h is smaller than the outer diameter width of the pin member 23.
Therefore, the pin member 23 that advances and retreats through the pin hole 12h does not fall into the cam guide groove 12g, so that the engagement means 20 can be easily assembled to the counter gear shaft 12.

Since the cam rod C is slidably fitted in the cam guide groove 12g, the pin member 23 fitted in the pin hole 12h comes into contact with the cam surface of the corresponding cam rod C at the center end, and the cam rod C moves. When the cam groove v corresponds to the pin hole 12h, the pin member 23 falls into the cam groove v, and when the slidable contact surface other than the cam groove v corresponds, the pin member rides on the slidable contact surface and moves forward and backward by the movement of the cam rod C.
The advancement and retraction of the pin member 23 in the pin hole 12h causes the distal end portion of the pin member 23 to protrude outward from the bottom surface of the circumferential groove 12cv.

The swinging claw member R is formed in the circumferential groove 12cv that communicates between the long rectangular recess 12p and the short rectangular recess 12q formed on the outer peripheral portion of the central cylindrical portion 12a of the counter gear shaft 12 having the above-described structure. Is embedded, and a support pin 26 is embedded in the axial groove 12av to pivotally support the swing claw member R.
FIG. 11 shows a state in which all the swinging claw members R are assembled in this way.

  In the exploded perspective view of FIG. 10, the circumferential grooves 12cv, the long rectangular recesses 12p, and the short rectangular recesses 12q corresponding to the odd-numbered gears (first, third, and fifth driven transmission gears n1, n3, and n5) are embedded. Four oscillating claw members R, and circumferential grooves 12cv and long rectangular recesses 12p corresponding to even-numbered even gears (second, fourth and sixth driven transmission gears n2, n4, n6), The four swinging claw members R embedded in the short rectangular recess 12q are illustrated in a posture maintaining the relative angular positional relationship with each other, and in addition, a support pin that pivotally supports each swinging claw member R. 26 and a compression spring 22 and a pin member 23 acting on each swing claw member R are shown.

  The swinging claw members R are all of the same shape, have a substantially arc shape when viewed in the axial direction, and the outer peripheral portion of the through hole through which the support shaft pin 26 penetrates in the center lacks the bearing recess Rd. A wide rectangular engagement claw Rp is formed on one side of the bearing recess Rd so as to be swingably fitted to the long rectangular recess 12p. A pin hole is formed on the other side. A narrow pin receiving portion Rr that slidably fits in the circumferential groove 12cv formed with 12h extends, and an end of the pin receiving portion Rr reaches a short rectangular recess 12q to form a wide end Rq that is widened. Yes.

In the swing claw member R, the pin receiving portion Rr is fitted in the circumferential groove 12cv in which the pin hole 12h is formed, and one engaging claw portion Rp is fitted in the long rectangular recess 12p and the bearing recess Rd is formed. The other wide end Rq is fitted in the short rectangular recess 12q, matching the axial groove 12av.
Then, the support pin 26 is fitted into the matched bearing recess Rd and the axial groove 12av.

  The swinging claw member R is formed symmetrically with respect to the circumferential groove 12cv to be fitted, and one wide rectangular engagement claw Rp is heavier than the other pin receiving part Rr and the wide end Rq, When the pin 26 is pivotally supported and rotates together with the counter gear shaft 12, the swinging claw member R swings so that the engaging claw Rp acts as a weight against the centrifugal force and protrudes in the centrifugal direction.

The swinging claw member R is formed such that the pin receiving portion Rr is narrower than the engaging claw Rp side on the opposite side with respect to the swinging center.
Further, since the pin receiving portion Rr only needs to have a width sufficient to receive the pin member 23, the swinging claw member R can be formed in a small size, and the other engaging claw portion Rp can be swung by the centrifugal force. The movement can be facilitated.

  Since the swinging claw members R adjacent to each other in the circumferential direction are assembled to the counter gear shaft 12 in a symmetrical attitude, the engaging claw portions Rp, Rp facing each other with a predetermined interval are the same long rectangular recess 12p. The other wide end Rq adjacent to each other is fitted into a common short rectangular recess 12q.

  A compression spring 22 supported at one end by a spring receiving portion 12d of the counter gear shaft 12 is interposed inside the engaging claw portion Rp of the swing claw member R, and is inserted into the pin hole 12h inside the pin receiving portion Rr. The pin member 23 is interposed between the cam rod C and the pin member 23.

  In this way, the swing claw member R is pivotally supported by the support pin 26 and is embedded in the long rectangular recess 12p, the short rectangular recess 12q, and the circumferential groove 12cv of the counter gear shaft 12, The engaging claw portion Rp is urged outward by the compression spring 22, and the other pin receiving portion Rr is pressed by the advancement and retraction of the pin member 23, so that the oscillating claw member resists the urging force of the compression spring 22. R swings.

When the pin member 23 advances in the centrifugal direction and swings the swinging claw member R, the swinging claw member R has the engagement claw portion Rp submerged in the long rectangular recess 12p and the central cylinder of the counter gear shaft 12 There is nothing that protrudes outward from the outer peripheral surface of the portion 12a.
When the pin member 23 is retracted, the engaging claw Rp biased by the compression spring 22 protrudes outward from the outer peripheral surface of the central cylindrical portion 12a of the counter gear shaft 12, and can be engaged with the driven transmission gear n. To do.

  The compression spring 22 has an elliptical shape whose major axis is the axial direction of the counter gear shaft 12. The elliptical compression spring 22 has a major axis larger than the width of the pin receiving portion Rr of the swinging claw member R, and the pin receiving portion Rr. Since the counter gear shaft 12 can be easily machined and the swinging claw member R can be stabilized stably. The counter gear shaft 12 can be assembled.

  Four swinging claw members R corresponding to odd-numbered gears (first, third, and fifth driven transmission gears n1, n3, and n5) and even-numbered gears (second, fourth, and sixth driven gears) The four swinging claw members R corresponding to the transmission gears n2, n4, n6) are in a relative angular position relationship rotated 90 degrees around the axis.

  Four swinging claw members R corresponding to the odd-numbered gears (first, third, and fifth driven transmission gears n1, n3, and n5) are in contact with each other in the forward rotation direction of the gear, and each odd-stage driven transmission gear n1. , N3, n5 and the counter gear shaft 12 are engaged with each other so as to rotate in synchronization with each other, and the odd-numbered driven gears n1, n3 are in contact with each other in the reverse rotation direction of the gear. , N5 and counter gear shaft 12 are provided with a pair of counter-rotating odd-numbered engaging members Rbo that are engaged so as to rotate in synchronization with each other at symmetrical positions.

  Similarly, the four swinging claw members R corresponding to the even-numbered gears (second, fourth, and sixth driven transmission gears n2, n4, and n6) are brought into contact with each other in the forward rotation direction of the gears, and each even-numbered gear is driven. A forward rotation even-numbered-stage swinging claw member Rae engaged so that the transmission gears n2, n4, n6 and the counter gear shaft 12 rotate in synchronization with each other, and the even-numbered driven gears in contact with each other in the reverse rotation direction of the gear. A pair of counter-rotating even-numbered engaging members Rbe that are engaged so that n2, n4, and n6 and the counter gear shaft 12 rotate synchronously are provided in pairs at symmetrical positions.

The forward rotation odd-stage swinging claw member Rao is swung by the pin member 23 that moves forward and backward by the movement of the forward rotation odd-stage cam rod Cao, and the reverse rotation odd-stage engagement member Rbo is moved by the reverse rotation odd-stage cam rod Cbo. It swings by the pin member 23 that advances and retreats by
Similarly, the forward rotating even-stage swinging claw member Rae is swung by the pin member 23 that moves forward and backward by the movement of the forward-rotating even-numbered cam rod Cae, and the reverse-rotating even-numbered engaging member Rbe The pin member 23 is moved back and forth by the movement of Cbe to swing.

  When the engagement means 20 is incorporated in the counter gear shaft 12, first, the right end bearing collar member 13 is externally mounted on the outer peripheral end of the central cylindrical portion 12a, and the support pin 26 is inserted into the axial groove 12av inside the bearing collar member 13. The right end engaging means 20 is incorporated so that one end of the shaft is inserted, and the next bearing collar member 13 is packaged so as to cover the other end of the support pin 26, and then the next stage engagement is performed in the same manner as the previous stage. The incorporation of the combining means 20 is sequentially repeated, and finally the bearing collar member 13 at the left end is packaged to finish.

As shown in FIG. 12, the bearing collar member 13 is sheathed in an axial position other than the long rectangular recess 12p and the short rectangular recess 12q of the central cylindrical portion 12a, and is continuously embedded in a line in the axial groove 12av. The support pin 26 is disposed across the adjacent support pins 26 and 26 to prevent the support pin 26 and the swinging claw member R from falling off.
Since the support pin 26 embedded in the axial groove 12av of the central cylindrical portion 12a of the counter gear shaft 12 is embedded at a depth in contact with the outer peripheral surface of the central cylindrical portion 12a, when the bearing collar member 13 is sheathed. It is fixed without play.

Seven bearing collar members 13 are mounted on the counter gear shaft 12 at equal intervals, and the driven transmission gear n is rotatably supported so as to straddle between the adjacent bearing collar members 13 and 13.
Each driven transmission gear n has a notch formed in the left and right inner periphery (the left and right periphery of the inner peripheral surface), and a thin annular protrusion 30 is formed between the left and right notches. The left and right bearing collar members 13 and 13 are slidably engaged with the notches so as to be sandwiched (see FIGS. 2 and 3).

The protrusions 30 on the inner peripheral surface of each driven transmission gear n have six engaging projections 31 formed at equal intervals in the circumferential direction (see FIGS. 2, 3, 4 and 5).
The engagement convex portion 31 has a thin arc shape when viewed from the side (in the axial direction shown in FIGS. 4 and 5), and both end surfaces in the circumferential direction engage with the engagement claw portion Rp of the swing claw member R. An engagement surface is formed.

  The forward rotation odd-numbered swinging claw member Rao (forward rotation even-numbered swinging claw member Rae) and the reverse rotation odd-numbered step engagement member Rbo (reverse rotation even-numbered step engagement member Rbe) Rp and Rp are extended, and the positive rotation odd-numbered swinging claw member Rao (positive rotation even-numbered swinging claw member Rae) is an engagement convex portion in the positive rotation direction of the driven transmission gear n (and the counter gear shaft 12). The reverse rotation odd-numbered engagement member Rbo (reverse rotation even-numbered engagement member Rbe) contacts and engages the engagement convex portion 31 in the reverse rotation direction of the driven transmission gear n. To do.

  It should be noted that the forward rotation odd-numbered swinging claw member Rao (forward rotation even-numbered swinging claw member Rae) is not engaged in the reverse rotation direction of the driven transmission gear n even if the engagement claw portion Rp protrudes to the outside. In addition, the reverse rotation odd-numbered engagement member Rbo (reverse rotation even-numbered engagement member Rbe) is not engaged in the forward rotation direction of the driven transmission gear n even if the engagement claw Rp protrudes outward.

Referring to FIGS. 13 to 15, when shifting up from the first-speed acceleration state to the second-speed state where the reduction ratio is one step smaller, the engagement convex portion 31 of the first driven transmission gear n <b> 1 is rotated in an odd number of forward rotations. A second driven transmission gear n2 that rotates at a higher speed while the counter gear shaft 12 is rotating at the same speed as the first driven transmission gear n1 by contacting and engaging with the engaging claw Rp of the moving claw member Rao. Since the engaging convex portion 31 catches up and comes into contact with the engaging claw portion Rp of the forward rotation even-numbered swinging claw member Rae, the counter gear shaft 12 is rotated at a higher speed together with the second driven transmission gear n2 to change the speed. The engagement claw Rp of the positive rotation odd-numbered swinging claw member Rao is naturally separated from the engagement convex portion 31 of the first driven transmission gear n1, and the engagement is smoothly released. It can operate smoothly and perform upshifts smoothly.
Shift down can be performed smoothly as well.

The procedure for assembling and disassembling the multi-stage transmission 10 as described above will be described below.
First, the disassembly procedure of the multi-stage transmission 10 will be described with reference to FIGS.
FIG. 16 shows a state in which the counter gear shaft 12 supporting the driven transmission gear n group of the multi-stage transmission 10 from the engine case 1 together with the side wall 1RR and the shift drum 67 is supported by the jig base 80. Show.
The counter gear shaft 12 is supported by a central cylindrical portion 12a with a driven transmission gear n via a bearing collar member 13, and is sandwiched between washers 14L and 14R fitted on both sides, and is fitted to the right cylindrical portion 12c. It is supported on the side wall 1RR via the bearing 7R.

A clamp mechanism 81 that holds the left cylindrical portion 12 b of the counter gear shaft 12 is erected at the end of the jig base 80.
With the upper and lower clamping portions 81a and 81b of the clamp mechanism 81 holding and supporting the left cylindrical portion 12b of the counter gear shaft 12, the jig base 80 can slide on the side wall 1RR with the counter gear shaft 12 horizontal. I support it.

Accordingly, when the side wall 1RR is moved rightward (rightward in FIGS. 16 and 17) with the left cylindrical portion 12b of the counter gear shaft 12 fixed, as shown in FIG. 17, the bearing 7R is integrated with the side wall 1RR. Then, the shift drum 67 moves, and the control rod operating element 55 is pulled rightward through the shift pin 58 fitted in the shift groove 67v of the shift drum 67.
When the control rod operator 55 is pulled and moved to the right, the control rod 51 is moved via the bearing 56, and the control rod 51 is accompanied by the eight cam rods C via the lost motion mechanisms 52 and 53 and the counter gear. It is pulled out from the hollow part of the shaft 12 (see FIG. 17).

  When the control rod 51 is pulled out partway along with the cam rod C, the shift of the eight cam rods C together with the lost motion mechanisms 52 and 53 around the control rod 51 is a half cylindrical member. The rod holder 82 surrounds, and the periphery is fastened together with a tie wrap 83 (see FIG. 18).

The control rod 51 is surrounded by the shift rod holder 82 and pulled out from the hollow portion of the counter gear shaft 12 together with the cam rod C (see FIG. 19).
The pulled out control rod 51 and cam rod C are surrounded by the shift rod holder 82 and can be handled as a single unit, and can be easily inserted into and removed from the hollow portion of the counter gear shaft 12 for assembly. The disassembly workability is improved.

After the control rod 51 is pulled out from the hollow portion of the counter gear shaft 12 together with the cam rod C in this way, the counter rod 85 is inserted into the hollow portion of the counter gear shaft 12 instead (see FIG. 20).
The counter rod 85 is a cylindrical member, and a ridge that is inserted in place of the eight cam guide grooves 12g into which the cam rod C formed on the hollow inner peripheral surface of the counter gear shaft 12 is slidably inserted. 85a is formed, and a plug member 86 is fitted to the end portion.

  Therefore, when the counter rod 85 is inserted into the hollow portion of the counter gear shaft 12, the protrusions 85a are inserted into the cam guide grooves 12g to push out all the pin members 23 toward the outer periphery of the counter gear shaft 12, thereby The moving claw member R is swung against the compression spring 22, and the engaging claw portion Rp of the swinging claw member R is sunk inward from the outer peripheral surface of the second gear shaft 12, so that all the driven transmission gears n The engagement of the engaging claw Rp of the swing claw member R can be released.

  Along with this counter rod 85, the first holder base 87 is fitted and held with a hollow disc-like lid member 92 at the left end of the cylindrical body 87a with the outer collar 90 fitted and set to the outer circumference of the cylindrical body 87a. In this state, the cylindrical main body 87a is brought into contact with the right end of the counter gear shaft 12.

In the first holder base 87, one end of a cylindrical main body 87a is developed in a flange shape to form a pedestal 87b. The cylindrical main body 87a has an outer diameter that is the outer diameter of the counter gear shaft 12 (the driven transmission gear n is pivotally supported). And the inner diameter is substantially equal to the outer diameter of the right cylindrical portion 12c of the counter gear shaft 12.
A flange 87c is formed near the left end on the inner periphery of the cylindrical main body 87a, and the protrusion of the plug member 86 fitted to the right end of the counter rod 85 can be fitted and held. The counter rod 85 can be inserted into the hollow portion of the counter gear shaft 12 with the right end of 85 held.

  The outer collar 90 is a cylindrical member having an inner diameter substantially equal to the outer diameter of the cylindrical main body 87a of the first holder base 87 and the central cylindrical portion 12a of the counter gear shaft 12, and the outer periphery of the central cylindrical portion 12a of the counter gear shaft 12 A plurality of hole portions 90h into which the engaging claw portions Rp protruding from the outer peripheral surfaces of the plurality of swinging claw members R fitted to the surface can enter are formed.

When the counter rod 85 is thus inserted into the counter gear shaft 12, the first holder base 87 is moved, and the cylindrical main body 87a is brought into contact with the side wall of the central cylindrical portion 12a of the counter gear shaft 12, as shown in FIG. The plug member 86 at the right end of the counter rod 85 enters the counter gear shaft 12, and the right cylindrical portion 12c of the counter gear shaft 12 is fitted into the cylindrical main body 87a of the first holder base 87 and comes into contact with the flange portion 87c.
The cylindrical body 87a of the first holder base 87 has the same outer peripheral surface as the central cylindrical portion 12a of the counter gear shaft 12, and the lid member 92 held at the left end of the cylindrical body 87a is the first driven transmission gear n1 at the right end. To touch.

With the clamping mechanism 81 released from being clamped and the counter gear shaft 12 being coupled to the first holder base 87, the first holder base 87 is placed on the lower side and held on the base 87b of the first holder base 87 (see FIG. 22).
The counter gear shaft 12 and the counter rod 85 are supported by the first holder base 87, and the driven transmission gear n group is supported by the outer collar 90 via the lid member 92.

Then, as shown in FIG. 22, the gear holder 91 is put on the driven transmission gear n group from above.
The gear holder 91 has a cup shape in which a hollow bottom wall 91b is formed at a small-diameter end of a conical tube-shaped peripheral wall 91a, and a large-diameter first driven transmission gear with the large-diameter opening side down. When the gear holder 91 is put on a group of driven transmission gears n whose diameters are reduced from n1 in order, the hollow bottom wall 91b of the gear holder 91 is supported by the uppermost sixth driven transmission gear n6, and the driven transmission gear n group is surrounded by a peripheral wall. 91a surrounds and the lid member 92 covers the large-diameter opening on the lower side of the peripheral wall 91a.
Note that a bearing collar member in which a washer 14L press-fitted into the left cylindrical portion 12b of the counter gear shaft 12 and fixed in contact with the upper side wall surface of the central cylindrical portion 12a rotatably supports the sixth driven transmission gear n6 at the uppermost stage. Holds 13 from above.

  In this state, when the outer collar 90 is lifted upward and the spacer 93 is sandwiched between the outer collar 90 and the base 87b of the first holder base 87, the outer collar 90 is attached to the first holder base 87 as shown in FIG. On the other hand, the driven transmission gear n group is moved upward together with the gear holder 91 via the lid member 92, and at the same time the washer 14L is fixed to the counter gear shaft 12, so that the counter gear shaft 12 is also moved upward together with the counter rod 85. To do.

Then, when a cap 94 is put on the upper end of the counter gear shaft 12, and the tap 94 is tapped lightly with a hammer or the like, the washer 14L is held in contact with the driven transmission gear n group and the bearing collar member 13, and the counter The gear shaft 12 is lowered, and the washer 14L is released from the counter gear shaft 12.
The counter gear shaft 12 descends and is supported in contact with the cylindrical body 87a of the first holder base 87.
When the cap 94 and the washer 14L are removed from the counter gear shaft 12, and the spacer 93 is also removed, the driven transmission gear n group is lowered together with the outer collar 90, and the state shown in FIG. 25 is obtained.

Then, the second holder base 95 is fitted to the left cylindrical portion 12b of the counter gear shaft 12 protruding upward.
The second holder base 95 has a cylindrical main body 95a having the same outer diameter as the central cylindrical portion 12a of the counter gear shaft 12 and an inner diameter substantially equal to the outer diameter of the left cylindrical portion 12b, and one end of the cylindrical main body 95a has a flange shape. The base 95b is formed by unfolding.

  When the cylindrical body 95a of the second holder base 95 is fitted to the left cylindrical portion 12b of the counter gear shaft 12 from above with the pedestal 95b facing upward, the cylindrical main body 95a comes into contact with the central cylindrical portion 12a of the counter gear shaft 12. The cylindrical body 95a and the counter gear shaft 12 are connected to form the same outer peripheral surface.

  In this state, when the top and bottom are turned upside down, the engaging claw Rp of the swing claw member R is immersed inward from the outer peripheral surface of the second gear shaft 12 by inserting the counter rod 85 into the hollow portion of the counter gear shaft 12. Since the engagement of all the driven transmission gears n and the engaging claws Rp of the swinging claw members R is released, the driven transmission gears n group together with the gear holder 91 and the lid member 92 by gravity as shown in FIG. The outer collar 90 descending and moving from the central cylindrical portion 12a of the counter gear shaft 12 to the cylindrical main body 95a of the second holder base 95 is lowered together with the central cylindrical portion 12a of the counter gear shaft 12 instead of the driven transmission gear n group. Move on.

On the other hand, at the time of assembly, the driven transmission gear n group can be fitted to the central cylindrical portion 12a of the counter gear shaft 12 in place of the outer collar 90.
In this way, the outer collar 90 can be used in combination with the counter rod 85, and the driven transmission gear n group and the outer collar 90 can be alternately incorporated into or removed from the counter gear shaft 12. Assembling and disassembling work can be facilitated.
Further, since the driven transmission gear n group is accommodated in the gear holder 91 and covered with the lid member 92 so that it can be handled as a unit, the driven transmission gear n group can be easily attached to and detached from the counter gear shaft 12. This facilitates assembly and disassembly work of the multi-stage transmission.

  Further, the cylindrical body 87a of the first holder base 87 is brought into contact with the central cylindrical portion 12a of the counter gear shaft 12 so as to form the same outer peripheral surface, thereby connecting the cylindrical main body 87a of the outer collar 90 and the center of the counter gear shaft 12. The movement to and from the cylindrical portion 12a is made smooth, and hence the attachment and detachment of the driven transmission gear n group to and from the counter gear shaft 12 are made smooth, and the assembly and disassembly work of the multi-stage transmission is made easier.

As described above, when the bottom wall 91b of the gear holder 91 comes into contact with the base 95b of the second holder base 95 and stops descending, the driven transmission gear n group is completely moved to the cylindrical body 95a of the second holder base 95, The outer collar 90 moves to the central cylindrical portion 12a of the counter gear shaft 12 and covers the outer periphery of the central cylindrical portion 12a (see FIG. 27).
FIG. 27 shows a state where the first holder base 87 is removed from this state and the counter rod 85 is removed from the hollow portion of the counter gear shaft 12.

By pulling out the counter rod 85 from the hollow portion of the counter gear shaft 12, all the pin members 23 are released, and all the swing claw members R are swung by the compression springs 22, so that the swing claw members The engagement claw portion Rp of R protrudes outward from the outer peripheral surface of the second gear shaft 12, and enters and engages with the hole 90h of the outer collar 90.
Therefore, as shown in FIG. 28, when the counter gear shaft 12 is pulled upward from the cylindrical body 95a of the second holder base 95, the outer collar 90 is also locked to the counter gear shaft 12 and separated together.

The driven transmission gear n group supported by the second holder base 95, covered with the gear holder 91, and covered with the lid member 92 is turned upside down, and the second holder base 95 is removed upward, and FIG. As shown in FIG. 4, the gear holder 91 is removed upward so that the driven transmission gear n group can be easily disassembled together with the bearing collar member 13 thereafter.
Note that the outer collar 90 can be removed from the central cylindrical portion 12a of the counter gear shaft 12 by inserting the counter rod 85 into the hollow portion on the counter gear shaft 12 side. Each swinging claw member R, pin member 23, compression spring 22, and spindle pin 26 can be easily disassembled from the portion 12a.

The above is the disassembling procedure of the multi-stage transmission 10. If the disassembling procedure is executed in reverse, the assembling procedure of the multi-stage transmission 10 is obtained.
However, unlike the disassembly operation, it is not easy to assemble the swinging claw member R, the pin member 23, the compression spring 22 and the support shaft pin 26 to the central cylindrical portion 12a of the counter gear shaft 12 in the assembly operation.
Therefore, a ratchet set holder 100 which is a jig for assembling the swinging claw member R and the like is used.

The ratchet set holder 100 includes a cylindrical main body 100a having an inner diameter substantially equal to the outer diameter of the central cylindrical portion 12a of the counter gear shaft 12 and an annular support portion 100b in which one open end of the cylindrical main body 100a has an enlarged diameter. A rectangular opening portion 100c from which one of the swinging claw members R can be exposed is cut out at the other end opening end.

Referring to FIG. 30, the cylindrical body 100a of the ratchet set holder 100 is fitted from above to the counter gear shaft 12 fitted and supported by the second holder base 95 with the opening 100c facing downward. The opening 100c is aligned with the place where the swinging claw member R used for the 12th first driven transmission gear n1 is assembled, and the swinging claw member R, the pin member 23, the compression spring 22, and the support pin 26 are connected to the opening 100c. Include.
Since the first driven transmission gear n1 requires four swinging claw members R, the ratchet set holder 100 is rotated, and the swinging claw member R and the like are sequentially assembled so that the opening 100c is aligned with the required location. .
The built-in swinging claw member R and the like are not removed by being covered with the peripheral wall of the cylindrical main body 100a of the ratchet set holder 100.

When the four swinging claw members R for the first driven transmission gear n1 are incorporated, the ratchet set holder 100 is lowered by one step, and the four swinging claw members R for the second driven transmission gear n2 are moved. The same assembling operation is repeated for the third, fourth, fifth, and sixth driven transmission gears n3, n4, n5, and n6.

As described above, by using the ratchet set holder 100, the troublesome work of incorporating the swinging claw member R, the pin member 23, the compression spring 22, and the support shaft pin 26 at a plurality of locations in the central cylindrical portion 12a of the counter gear shaft 12 is achieved. It is easy and can proceed smoothly and promptly.

Thus, when all the swinging claw members R and the like are incorporated in the central cylindrical portion 12a of the counter gear shaft 12, the ratchet set holder 100 has an outer periphery of the central cylindrical portion 12a of the counter gear shaft 12 incorporating the swinging claw members R and the like. (See FIG. 31).
Here, the counter rod 85 is inserted into the hollow portion of the counter gear shaft 12 from above, and the engaging claw portion Rp of the swing claw member R is immersed inside from the outer peripheral surface of the second gear shaft 12, The outer collar 90 is coaxially fitted to the annular support portion 100b at the upper end of the ratchet set holder 100 from above (see FIG. 32).

When lowered the ratchet set holder 100 together with the outer collar 90 in this state, the ratchet set holder 100 is moved from the central cylindrical portion 12a of the counter gear shaft 12 in a cylindrical body 95a of the second holder base 95, outer ratchet set holder 100 and turnover The collar 90 moves to the central cylindrical portion 12a of the counter gear shaft 12 (see FIG. 33).

Here, by pulling out the counter rod 85 from the hollow portion of the counter gear shaft 12, the engaging claw portions Rp of all the swing claw members R protrude outward from the outer peripheral surface of the second gear shaft 12, and the holes of the outer collar 90 Part 90h is entered and engaged.
Therefore, as shown in FIG. 34, when the counter gear shaft 12 is pulled upward from the cylindrical main body 95a of the second holder base 95, the outer collar 90 is also locked to the counter gear shaft 12 and separated together.

Thus, it is possible to easily configure a state where all the swinging claw members R are incorporated in the central cylindrical portion 12a of the counter gear shaft 12 and covered with the outer collar 90.
The counter gear shaft 12 side is in the state shown in FIG. 28. On the other hand, as shown in FIG. 28, the gear holder is mounted on the cylindrical main body 95a of the second holder base 95 supported upright by the pedestal 95b. 91 is fitted with the hollow bottom wall 91b down, and then the bearing collar member 13, the sixth driven transmission gear n6, the bearing collar member 13, ..,..., First driven transmission gear n1, bearing collar member 13 are stacked in this order, and finally the lid member 92 is used to cover the driven transmission gear n group.

Subsequent assembling procedures may be performed by reversing the above disassembling procedure, and the assembling work of the multi-stage transmission can be easily performed.
As described above, by using an appropriate jig, it is possible to facilitate the assembly and disassembly of the multi-stage transmission, shorten the work time, and reduce the work effort.

m: drive transmission gear, m1 to m6 ... first to sixth drive transmission gears,
n: driven transmission gear, n1 to n6: first to sixth driven transmission gears,
10 ... multi-speed transmission, 11 ... main gear shaft, 12 ... counter gear shaft, 13 ... bearing collar member,
20 ... engaging means, 23 ... pin member, 31 ... engaging convex part,
32 ... output sprocket, 37 ... cap nut, 38 ... chain,
C ... cam rod, p ... locking claw, v ... cam groove, R ... swinging claw member, Rp ... engagement claw part,
50: Variable speed drive means, 51: Control rod, 51a, 51b ... Outer peripheral recess, 51as, 51bs ... Diameter expansion stopper, 52, 53 ... Lost motion mechanism, 52h, 53h ... Spring holder, 52ha, 53ha ... Inner peripheral recess, 52s, 53s ... coil spring, 52c, 53c ... cotter, 55 ... control rod operator, 58 ... shift pin, 59 ... engagement pin, 60 ... groove, 67 ... shift drum, 67v ... shift groove,
80 ... Jig base, 81 ... Clamp mechanism, 82 ... Shift rod holder, 85 ... Counter rod, 86 ... Plug member, 87 ... First holder base, 87a ... Cylinder body, 87c ... Hut, 90 ... Outer collar, 90h ... Hole, 91 ... Gear holder, 91a ... Peripheral wall, 91b ... Bottom wall, 92 ... Lid member, 93 ... Spacer, 94 ... Cap, 95 ... Second holder base, 95a ... Cylindrical body, 100 ... Ratchet set holder , 100c ... Aperture.

Claims (5)

A first gear shaft (11) that rotatably supports the first gear (m) group;
A second gear which is provided in parallel to the first gear shaft (11) and rotatably supports a second gear (n) group which always meshes with the first gear (m) group and has a hollow portion at the shaft center. The axis (12),
The second gear shaft (12) is supported in a swingable manner and is urged by a spring (22) so that the engaging claw portion (Rp) protrudes from the outer peripheral surface of the second gear shaft (12). (n) A swinging claw member that engages with an engaging projection (31) formed on the inner peripheral surface of the group and rotates the second gear shaft (12) and the second gear (n) group integrally. (R) and
The engaging claw portion (Rp) of the swinging claw member (R) provided so as to be able to advance and retreat from the axial center side of the second gear shaft (12) to the outer periphery of the second gear shaft (12). A pin member (23) to be pushed back inward from the surface,
A cam rod (C) provided in a hollow portion of the second gear shaft (12) so as to be slidable in the axial direction and having a cam groove for moving the pin member (23) forward and backward;
A control rod (51) for moving the cam rod (C) in the axial direction;
In the assembly and disassembly jig of the multi-stage transmission equipped with
Instead of the cam rod (C) and the control rod (51), the pin member (23) is inserted into the hollow portion of the second gear shaft (12) so that the outer peripheral direction of the second gear shaft (12). The engaging claw portions (Rp) of all the swinging claw members (R) pushed out to the inside from the outer peripheral surface of the second gear shaft (12) are pushed back inwardly to all the second gear (n) groups and the A counter rod (85) for releasing the engagement of the swing claw member (R);
When the engaging claw portion (Rp) of the swing claw member (R) is projected from the outer peripheral surface of the second gear shaft (12) while being fitted to the outer peripheral surface of the second gear shaft (12). An outer collar (90) provided with a hole (90h) through which the engaging claw portion (Rp) can enter,
A jig for assembling and disassembling a multi-stage transmission, comprising: A hollow bottom wall (91b) is formed at the small diameter end of the conical cylindrical peripheral wall (91a), and a gear holder surrounds the second gear (n) group supported by the second gear shaft (12). 91) and
A lid member (92) for accommodating the second gear (n) group inside the gear holder (91) and locking the lid to a large-diameter opening end of the gear holder (91); The jig for assembling and disassembling a multi-stage transmission according to claim 1. The multi-stage transmission assembly according to claim 1 or 2, further comprising a shift rod holder ( 82 ) surrounding the cam rod (C) in a state where the cam rod (C) is assembled to the control rod (51). And jig for disassembly.   A cylindrical main body (87a) having the same outer diameter as the second gear shaft (12); the outer collar (90) is set on the outer periphery of the cylindrical main body; and the inner end of the cylindrical main body (87a) The assembly and disassembly of a multi-stage transmission according to claim 2, wherein a first holder base (87) having a flange (87c) for holding the end of the counter rod (85) is provided on the periphery. jig.   An opening having a cylindrical main body (100a) fitted to the outer periphery of the second gear shaft (12) and exposing one of the swinging claw members (R) at one opening end of the cylindrical main body (100a). The assembly and disassembly jig for a multi-stage transmission according to any one of claims 1 to 4, further comprising a ratchet set holder (100) in which a portion (100c) is cut out.

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