JPS626895Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a neutral return device for a change lever, and has a simple structure that allows the change lever to automatically return to the neutral position by switching the change lever to the desired position and then releasing the hand. The purpose is to provide.

The change lever device, which is a device that selectively engages the driving gear and the driven gear in conjunction with the switching operation of a change lever pivotally mounted on the fixed side, is used to manually perform the desired switching, and then move the lever in the opposite direction to return to the original state. It was very troublesome as it required re-operation.

The present invention is capable of automatically returning to the neutral state by releasing the change lever after performing the desired switching operation, and the transmission is linked to the switching operation of the change lever pivoted on the fixed side. In a transmission device that selectively engages a driven gear with respect to a drive gear in a case, a switching lever has a swing arm and an engaging portion that rotatably holds the driven gear on a support shaft rotatably supported in the transmission case. are fixed to each other, and an engaged body is provided on the change lever side pivotally connected to the transmission case side, the engaged body irremovably engaging with the engaging portion in the operating direction of the change lever,
Further, a neutral return body is provided on the switching lever, and the neutral return body is slidably engaged with a guide groove of a neutral return guide fixed to the transmission case side, and the guide groove is moved from the neutral position in the switching direction. Accordingly, the present invention is characterized in that it has an inclined guide part and is provided with a spring that urges the neutral return body to the neutral position of the guide part.

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

Figures 1 to 3 show the configuration of the embodiment of the present invention,
4 and 5 show an example of application of the present invention. Reference numeral 1 denotes a transmission case, in which a drive gear 4 having teeth 2 and 3 on the inner and outer peripheries is provided.

Reference numeral 5 designates a change lever, and a wide portion 6 at the base thereof is pivotally connected to the transmission case 1 side by a pivot 9 through a neutral return guide 8 which is removably fixed to the side surface of the transmission case 1 via a bolt 7. has been done.

In this example, an engaged body 10 is formed as a concave portion on one side of the wide portion 6, and a forced return lever 11 is fixed to the wide portion 6 on the extension of the lever.

Reference numeral 12 denotes a support shaft, which is rotatably supported on the side cover of the transmission case 1 as shown in FIG.
A swing arm 1 is installed inside the transmission case 1 of the support shaft 12.
Furthermore, a switching lever 14 is fixedly installed outside the case 1.

The swinging arm 13 has a dogleg shape as shown in FIG.
8 is rotatably held, and the driven gear 17 and the driven gear 18 can be selectively engaged with the inner teeth 2 of the drive gear 4 and the outer teeth 3 of the drive gear 4, respectively.

The switching lever 14 is L-shaped and has an engaging portion 19 indicated by a pin on its upper part, and the engaging portion 19 and the engaged portion 10 are irreleasably engaged with respect to the operating direction of the change lever 5. .

The neutral return guide 8 has an L-shaped extending portion on the switching lever 14 side, and the extending portion 2
A guide groove 21 is formed in the upper part of 0.

In this example, the guide groove 21 has a neutral position at the longitudinal center of the groove, and a guide part 21A that gradually becomes higher and slopes on both sides of the center, and the neutral position is slidably engaged with the guide part 21A. In this example, the return body 22 connects the pin 2 to the bracket 23 fixed to the switching lever 14.
In this example, a spring 25 is hung between the return body 22 and the support shaft 12, which urges the return body 22 to the neutral position of the guide portion 21A.

FIG. 4 and FIG. 5 are application examples of the above-mentioned embodiment,
The drive gear 4 is fixed to a transmission shaft 28 of a bevel gear transmission body 27 that is driven via a power receiving shaft 26 .

Further, a double gear having a large gear 29 and a small gear 30 is fitted and held on the support shaft 12 so as to freely rotate, and driven gears 17 and 18 are always engaged with the large gear 29, respectively. Further, the small gear 30 of the double gear is engaged with a gear 32 fixed to the feed screw shaft 31, and each gear has a driven gear 17, 18 connected to the toothed portion 2, 3 on either the outside or outside of the drive gear 4. A switching device 33 that can rotate the feed screw shaft 31 in the forward and reverse directions by engaging with the
The change lever 5 is the switching device 3.
It is said to be for 3.

The transmission case 1 is located in the center of the rotary machine frame 34, and has fixed cylinders 35 on both sides, and a pair of left and right movable cylinder arms 37 on the tilling section 36 side are slidably inserted into the fixed cylinders 35, and are extendable and retractable. A transmission shaft 28 is installed inside one movable cylinder arm 37, and a feed screw shaft 31 is installed inside the other movable cylinder arm 37.
is screwed into a nut 31A fixed to the movable cylinder arm 37.

A rotary tilling device R consisting of a rotary machine frame 34 and a tilling section 36 is a hydraulic device 3 for a tractor T.
8. It is connected via a three-point link 39 etc. so as to be able to move up and down, and power can be transmitted to the power receiving shaft 26 via a universal joint shaft 40.

When this power is transmitted, the tilling section 36 is driven via the transmission shaft 28, the chain transmission body 41, etc., and the drive gear 4 for the switching device 33 can be driven.

Therefore, for example, if the change lever 5 is rotated about the pivot shaft 9 in the direction of arrow A in FIG. 2 from the driver's seat of the tractor T with the rotary tiller R elevated, it will engage the engaged object 10. The switching lever 14 is rotated in the direction of arrow B in FIG. the driven gear 1 through the swinging of the swinging arm 13.
Either one of 7 and 18 is the tooth part 2 of the drive gear 4,
3, rotate the screw shaft 31 in the forward or reverse direction through the double gears 29, 30 and the gear 32, and slide the tilling part 36 side to either the left or right in the tilling direction through the nut 31A. Can be done.

This sliding movement of the tilling section 36 is convenient during ridge tilling work, but when the amount of sliding reaches a predetermined position (amount) and the operating force of the change lever 5 is released, the return body 22 moves into the guide groove. 21, and the spring 2
Since the switching lever 14 is biased to return to the neutral position at 5, the switching lever 14 automatically returns to the neutral position.
Further, the change lever 5 is also returned to the neutral position via the engaged body 10 and the engaging portion 19.

In FIGS. 2 and 5, reference numeral 42 denotes a connecting shaft provided on the left and right support frames 43, 43, that is, on the movable machine frame side, and has a pair of protrusions 45, 46 on both sides of the lever 11. However, when one of the protrusions 45, 46 comes into contact with the lever 11 due to the above-mentioned sliding, the change lever 5 is forcibly returned to the neutral position, and here, the protrusions 45, 46 and the lever 11 are connected to the tilling section. 36 maximum stroke limit.

The present invention provides a transmission device in which driven gears 17 and 18 are selectively engaged with a drive gear 4 in a transmission case 1 in conjunction with a switching operation of a change lever 5 pivotally mounted on a stationary side. A swing arm 13 rotatably holding the driven gears 17 and 18 and a switching lever 14 having an engaging portion 19 are fixed to a freely supported support shaft 12, and pivoted 9 to the transmission case 1 side. The change lever 5 side is provided with an engaged body 10 that irremovably engages with the engaging portion 19 in the operating direction of the change lever 5, and furthermore, a neutral return body 22 is provided on the change lever 14.
is provided, and the neutral return body 22 is slidably engaged with the guide groove 21 of the neutral return guide body 8 fixed to the transmission case 1 side, and the guide groove 21 is inclined from the neutral position according to the switching direction. Since it has a guide part 21A and is provided with a spring 25 that urges the neutral return body 22 to the neutral position of the guide part 21A, the drive gear 4 can be shifted by operating the change lever 5.
The driven gears 17 and 18 are engaged with the drive gear 4, and after the driven gears 17 and 18 are engaged with the drive gear 4 and the desired transmission is performed, the lever 5 is released. The lever 5
And gears 4, 17, 18 can be automatically returned to the neutral position.

That is, the return body 22 provided on the switching lever 14 is urged by the spring 25 to the neutral position of the guide groove 21, and the switching lever 14 and the change lever 5 are engaged with the engaged body 10 by the engaging portion 19. Therefore, when the lever 5 is released, the lever 5 can be automatically returned to the neutral position, and the desired purpose can be effectively achieved.

[Brief explanation of the drawing]

FIG. 1 is a side view of the embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a rear view of the same, FIG. 4 is a side view of an example of application of the present invention, and FIG. 5 is a sectional view of the same essential parts. DESCRIPTION OF SYMBOLS 1... Transmission case, 4... Drive gear, 5... Change lever, 8... Guide body, 10... Engaged body, 12... Support shaft, 13... Swing arm, 14...
...Switching lever, 17, 18...Followed gear, 19...
...Engaged body, 21...Guide groove, 22...Returning body,
25...Spring.

Claims (1)

[Scope of utility model registration request] In a transmission device in which driven gears 17 and 18 are selectively engaged with a drive gear 4 in a transmission case 1 in conjunction with a switching operation of a change lever 5 pivotally mounted on a fixed side, the transmission case 1 is rotatably supported. A swing arm 13 rotatably holding the driven gears 17 and 18 and a switching lever 14 having an engaging portion 19 are respectively fixed to a support shaft 12, and the change lever 5 side is pivoted 9 to the transmission case 1 side. , the engaging portion 19
An engaged body 10 is provided which irremovably engages with respect to the operating direction of the change lever 5. Furthermore, a neutral return body 22 is provided on the switching lever 14, and the neutral return body 22 is fixed to the transmission case 1 side. The guide groove 21 of the neutral return guide 8 is slidably engaged with the guide groove 21, and the guide groove 21 has a guide portion 21A that is inclined from the neutral position in the switching direction. Spring 2 biases the neutral position of
5. A neutral return device for a change lever.