JPS6319449A - Speed change gear - Google Patents

Abstract

PURPOSE:To correctly carry out speed change positioning by forming stripe- shaped recessed parts on the inner peripheral surface of a gear to be speed- changed and positioning an engaging body by said recessed parts. CONSTITUTION:When the position of an engaging groove 3 does not coincide with the position of an engaging body 7, the top edge part of the engaging body 7 is engaged with the recessed part 9 on the inner peripheral surface of a gear 4 to be speed-changed. Therefore, the position of the engaging body 7 is maintained for the selected gear 4 to be speed-changed, and when either of a speed change shaft 2 or the gear 4 to be speed-changed revolves, the position of the engaging groove 3 coincides with the position of the engaging body 7. Therefore, the engaging body 7 is engaged with the engaging groove 3, and the gear 4 to be speed-changed is engaged with the speed change shaft 2 through a slide groove, and the speed change positioning can be correctly carried out.

Description

[Detailed description of the invention] Industrial applications This invention relates to a transmission.

Prior Art and Problems to be Solved by the Invention A hollow gear shift shaft is provided with an axial sliding groove extending from the outer layer surface to the inner circumferential surface, and an axial locking groove is provided on the gear shift shaft. A gear or a sprocket having a gear on its inner circumferential surface is rotatably connected to the gear, and a shift sliding shaft is slidably provided on the inner circumferential surface of the shifting shaft. A gearshift system that includes a locking body that engages with a locking groove of a gear or sprocket to be selectively shifted by retracting from the groove, and a spring that elastically biases the locking body in the direction of the locking groove. In the device,
When changing gears using a gear lever or the like, the gear shift sliding shaft is slid and the Pf! If the position of the locking groove matches the moving locking body, the locking body will engage with the locking groove by the spring, and the selected gear to be changed will be connected to the shifting shaft. However, if the position of the locking groove does not match the locking body, the locking body will only be in sliding contact with the inner circumferential surface of the gear to be shifted, so select the gear to be shifted. It is difficult to confirm the position of the locking body relative to the gear shift position, and therefore, providing a mechanism for confirming the gear shift position may complicate the configuration.

4 stages to solve the problem This invention has a gear shift shaft (2) having a sliding groove (1) along the axial direction, and a cover having an axial locking groove (3) on the inner circumferential surface. A speed change gear (4) is rotatably provided, and the gear to be changed is selectively shifted by moving in and out of the sliding groove (1) of the speed change shaft (2) based on the sliding movement. A locking body (7) that engages with a locking groove (3) of a gear (4) or sprocket (5)
is provided on the inner surface between each of the locking grooves (3) (3) of the gear to be shifted (4) along the inner circumferential surface with which the tip of the locking body (7) is slightly engaged. The transmission has a configuration in which a striped recess (9) is provided.

Effect of the Invention When the locking body (7) is slid by the speed change lever or the like, if the position of the locking IF groove (3) matches this locking body (7), the locking body (7) will slide. ) can engage with the locking groove (3), so the selected gear to be changed (4) is coupled to the transmission shaft (2), and the position of the locking groove (3) with respect to the locking body (7) If they do not match, the tip of the locking body (7) engages with the recess (9) on the inner circumferential surface of the gear to be shifted (4), so that The position of the locking body (7) is maintained, and then either the transmission shaft (2) or the gear to be changed (4) rotates, thereby forming a locking groove (3) at the position of the locking body (7). ) match, the locking body (7) will fit into the locking groove (3).
The gear to be changed (4) is coupled to the speed change shaft (2) via the sliding groove (1).

Effects of the Invention As described above, when the locking body (7) shifts and slides, the locking groove (
3) Even if this locking body (7) does not match the position, the recess (
9), the locking body (7) is positioned.
Each gear shift position becomes clear, and therefore the shift position of the gear shift operation can be determined accurately.

Embodiment In addition, in the illustrated example, there is a pair of left and right Fr'lJ on the lower front side.
A chassis (11) on which the wheels (10) (10) are mounted is provided, and a driving force G (12) with an output shaft (17) protruding rearward is mounted on the front part of the chassis (11). At the rear of this chassis (+1), there is a pair of left and right axles (13) at the bottom.
A transmission case (14) in which the transmission mechanism is housed by protruding the transmission case (13) is provided in an almost upright shape, and the left and right axles (13)
) (13) has a pair of left and right rear wheels (15) (1
5), and an input shaft (16) supported on a shaft bearing (55) that can be attached to the transmission case (14) in a front-left position on the front side of the transmission case (14). ) is provided protruding forward, and this human power shaft (16) and the output shaft (
17), a clutch mechanism (18) that connects and disconnects power to the input shaft (16) and a connecting shaft (19) that transmits power from the output shaft (17) to the clutch mechanism (18) are provided.

A small-diameter human-powered bevel gear (20) is connected to the rear end of the input shaft (16) in the transmission case (14).
A shaft bearing part (21) provided in a rod shape and provided on the left and right side walls of the transmission case (14) is provided on the rear side of the human-powered bevel gear (20).
A transmission shaft (22) supported by (21) is provided, and on this transmission shaft (22), a large-diameter full-tooth gear 1i (23) that fits 11 from the left side of the human-powered bevel gear (20) is fixed. Moreover, on the transmission shaft (22) on the right side of this bevel gear (23), a Subro gear (24), which has a smaller diameter than this bevel gear (23), is fixed close to this bevel gear (23). On the transmission shaft (22) on the right side of the sprocket (24), a small-diameter transmission gear (25) is provided in a rod shape with the transmission shaft (22). Also, on the transmission shaft (22) on the right side of this speed change gear (25), there are a plurality of speed change gears (2B) (2B) (2B) each having a larger diameter on the adjacent right side than the gear on the left side.
(2G) are installed in series, and these transmission gears (26)
(28) (2G) (28) Right transmission shaft (2
2) Above, there's a boss on the right! A small diameter reduction gear (28) having a diameter (27) is rotatably provided, and a large diameter reduction gear (29) is fixed onto this boss portion (27).

The through hole provided above the left side wall bearing part (21) has a shaft bearing part (31 ) are fitted and fixed, and a shaft bearing body (34) having a shaft bearing part (32) and a shaft seal part (31) is fitted into the through hole provided above the right side wall shaft bearing part (21). stick together. The left and right shaft bearings (
3o) (32) supports a speed change shaft (2) having a small-diameter reduction gear (35) that meshes with the reduction gear (29) and a protrusion projecting to the outside of this shaft support (34). Also, this speed change shaft (2) has a sliding hole (36) extending from the left side position of the reduction gear (35) to the left end of this speed change shaft (2).
and sliding grooves (1) in the axial direction extending from the outer circumferential surface to the sliding hole are provided in opposing positions.

The transmission shaft (2) has a plurality of locking grooves (3) (3) facing each other on its inner circumferential surface, and a large-diameter shaft (37) that is transmitted to the sprocket (24) by a chino (37). Sprocket 7) (5
) is provided rotatably, and furthermore, on this speed change shaft (2),
Each of the transmission teeth 1ξ (25) (2s) (2B) has a plurality of locking grooves (3) (3) facing each other on the inner circumferential surface.
(2B), each gear to be shifted (4) (4) (4
) and (4) are each rotatably arranged in series. Also, between the gear tooth l1t (4) at the left end and the large diameter sprocket (5), there are a plurality of locking grooves (3) (
3) is rotatably provided, and between each of the gear teeth 1 ((4) (4) (4) (4) and the neutral collar (38), these gear teeth Gear (4) (4)
(4) Print 1 on each side of (4) and neutral color (3B)
Thin collar to maintain position (39) (39
) (39) -- are provided respectively, and furthermore, between the large diameter sprocket (5) and the bearing part (30), a These gears (4) (4) (4) (4) (
4), collar (38) and large diameter sprocket (5)
) is provided with a locking collar (40) for locking the lateral movement of the head.

In addition, the slide hole (3B) of the speed change shaft (2) has a speed change slide having a shift groove (41) at the left end and a split groove (42) cut from the right end surface to approximately the middle part. A moving shaft (6) is provided to be able to freely slide, and a circular guide groove (43) that is orthogonal to the axial direction is provided at the right end of this split groove (42). Near the end of the groove (42) on the outer periphery of the shaft (6), a peripheral plane part (44) cut from the outer periphery along the groove (42) is provided.
) (44) has this peripheral plane part (44) (44
) are provided with two bottle holes (45) (45) penetrating between them, and the bottle holes (25) (25) are provided with holes that slide into the respective locking grooves (3) (3)... protrusion that can be inserted (
A pair of locking bodies (7) (7) consisting of 4B) and an arm part
is rotatably supported by pins (47) (47), and the pair of locking bodies (7) (
7) are provided with springs (8) that are bent in the direction of fitting the locking grooves (3) into the locking grooves (3), respectively.

11 (shaft (13) on the left and right in the transmission case (14)
(13) On these axles (13) (13)
A differential gear mechanism (48) (48) that differentially transmits the @Il-case (48) is provided, and the outer periphery of this case (49) meshes with the reduction gear (28). Large diameter reduction gear L: Fix (50).

Each of the gear teeth li, (4) (4) (4) (4) (4)
), neutral collar (38), and large diameter sprocket (
5) are each provided with four striped portions (9) along the inner circumferential surface into which the tips of the projections (46) are temporarily inserted when the locking bodies (7) (7) slide. establish.

In addition, (51) is a shifter arm that engages with the shift groove (41) to shift and slide the speed change sliding shaft (6), and (52) is a brake bag that brakes the speed change shaft (2). , (53)
(54) is a steering wheel for steering the left and right front wheels (10), and (54) is a driver's seat for the passenger.Next, the operation will be explained. The input shaft (16), which is transmitted from the output shaft (17) of the driving force n (12) via the connecting shaft (18) and the clutch mechanism (18), has an input bevel gear (20), a bevel gear (
23), and the subrocket (24) and each transmission gear (25) (2B) (2B) via the transmission shaft (22).
) (2B) (2B) and locking body (7)
The protrusion (46) of the locking groove (3) of the neutral collar (38)
sprocket (5) is engaged with Cheno (3).
7), and each geared tooth ・1・, (4) (4
)(4)(4)(4) is each gear tooth・1j(25)(
28) (2Ei) (2Ei) It is transmitted to (2B), but is it valley? The speed change shaft (2) maintains the stopped state 13 by idling.

Sprocket (5) or each variable gear (4) (4)...
・When the projection (46) of the locking body (7) engages with the locking groove (3) at one location, the geared tooth 1j (4) that engaged with this projection (46) becomes 1 ．． Projection (48), sliding groove (
1) to the speed change shaft (2), and from the speed change shaft (2), the speed reduction floats (35) (29) (28) (
50) and differential float mechanisms (48) (48), the power is transmitted to the left and right axles (13) (l1l).

When the shifter arm (51) is rotated by operating the shift lever, rod, etc. that interlocks the shifter arm (51), the shift sliding shaft (6) moves to the left or right through the shifter groove (41). When the protrusion (46) comes into contact with the collar (39), the protrusion (46) is moved into the sliding groove by the collar (39). (1) and pass through the collar (38) position, the spring (8) will cause the adjacent locking groove (
3) By fitting the protrusion (48) into the lock W (3) and the sliding groove (1), the lock W (3) and the sliding groove (1) are engaged with each other via the lock body (7).

Also, as mentioned above, when the projection (46) of the locking roller integral body (7) passes through the collar (39) due to the sliding of the sliding speed change shaft (6), a locking groove is formed at the position of projection 0 (4B). (3) is positioned, the protrusion (46) can fit into the locking groove (3), and when both (413) and (3) are not aligned, the projection (46) can fit into the locking groove (3). At this time, the protrusion (46) cannot fit into the four parts (9) of the locking body (7) by engaging the tip of the protrusion (46) with the recess (9) on the inner 161 surface.
), that is, the position of the locking body (7) for shifting the gear is maintained, and then the protrusion (46) and Locking groove (3)
When they are at the same position, the protrusion (4B) fits into the locking groove (3).

FIG. 6 shows a configuration in which a prime mover (12) with an output shaft (17) protruding downward is mounted, and the above-mentioned transmission case (14) is placed in a collapsed position facing forward.
Attach the shaft bearing (55) by swinging it so that the input shaft (16) faces upward, and then move the input shaft (16) from the output shaft (17) to the bell).
(5B).

In this way, the above-mentioned speed change transmission mechanism and transmission case (14
) can correspond to the direction of the output shaft of the mounted prime mover and the transmission mechanism from the output shaft.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front sectional view, Fig. 2 is a side sectional view, Fig. 3 is a partial slope view, and Fig. 4 is a partial front sectional view. FIG. 5 is a side sectional view thereof, and FIGS. 6 and 7 are side views of the whole. In the figure, (1) is a sliding groove, (2) is a gear shift shaft, (3) is a locking groove, (4) is a gear to be changed, (5) is a sprocket,
(6) shows the speed change sliding shaft, (7) the locking body, (8) the spring, and (9) the four parts.

Claims (1)

[Claims] A gearshift gear (2) having an axial locking groove (3) on its inner circumferential surface is mounted on a gearshift shaft (2) having an axial sliding groove (1).
4) is rotatably provided, and the sliding groove (1) of the transmission shaft (2)
Based on this sliding, the gear (4) to be selectively shifted by moving in and out of the sliding groove (1) or the sprocket (
A locking body (7) that engages with the locking groove (3) of 5) is provided, and the locking body (7) is provided on the inner peripheral surface between each locking groove (3) of the gear to be shifted (4). A transmission device provided with a linear recess (9) along the inner circumferential surface that slightly engages the tip of the body (7).