JPS6246040Y2 - - Google Patents

Description

[Detailed description of the invention] In a creep device that creeps the transmission line of a transmission, this invention consists of a clutch mechanism built into the creep device for selecting the creep line and the main line, and a transmission clutch mechanism provided in the transmission. operate simultaneously (so-called double biting)
This relates to a structure that prevents

In order to increase the reduction ratio of the transmission, a creep device is installed to creep between the transmission shafts of the transmission in order to keep production costs low.

By the way, in such a creep device, since the creep system path and the main system path are commonly transmitted to the transmission shaft where the transmission is located,
One of the routes must be selected alternatively and reliably.

This invention addresses this problem by employing a configuration in such a creep device in which when one system is in use, the other system is never used.

Hereinafter, specific embodiments of this invention will be described with reference to the drawings.

Figure 1 is a developed cross-sectional view of a power tiller equipped with a creep device according to this invention, Figure 2 is a side view of the same, and Figures 3 and 4 are cross-sectional views of essential parts showing the operational relationship of the creep device. However, transmission 1 transmits the power transmitted to input shaft 2 to each transmission shaft 3 to
8 and is finally transmitted to axles 9, 9, which are output shafts that are disposed abutting each other on the same axis. On the other hand, inside the transmission 1, there are three transmission clutch mechanisms 10 to 12 and one brake mechanism 1.
3 and a pair of clutch mechanisms 14, 14 are provided to appropriately shift, turn on/off, and brake the power transmitted to the axles 9, 9.

By the way, the creep device 15 is one in which two transmission shafts 4 and 5 are directly connected as their input shafts 16 and output shafts 17.
The gear ratio is different from the gear ratio between the two. That is, the creep device 15, which has its own gear train built into the creep case 18, is aligned with the input shaft 16 and output shaft 17 with respect to the transmission shafts 4 and 5 protruding from the transmission case 19. All you have to do is attach it.

Next, the main parts of the transmission system in the transmission 1 will be explained as follows.

First, a normal transmission path in which the clutch mechanism 20 of the creep device 15 is in the neutral position and the creep path is not used will be described.

First, power transmitted to the input shaft 2 of the mission 1 is transmitted to the transmission shaft 4 via the gear 40.

The power of the transmission shaft 4 is transmitted to the transmission clutch mechanism 1.
The following path is taken by the switching operation centered on the neutral position of the slide gear 29 in step 1.

One is that when the gear 40 on the transmission shaft 4 and the slide gear 29 mesh, the power of the transmission shaft 4 is transmitted through the transmission shaft 5 from each gear 43, 44 on the transmission shaft 5 to each gear on the transmission shaft 6. 45 and 46.

At this time, by the speed change operation of the speed change clutch mechanism 12 provided on the transmission shaft 6, either the meshing path of each gear 43, 45 or each gear 44, 46 is selected, and a high speed or a low speed is selected. The converted power is transmitted to the transmission shaft 6, and from this transmission shaft 6, it is transmitted to the next transmission shaft 7.

Secondly, when the speed change clutch mechanism 11 is operated and the slide gear 29 meshes with the inner gear of the gear 42 on the transmission shaft 5, the power of the transmission shaft 4 is transferred to the transmission shaft through the gears 41 and 42. 5 is transmitted to the slide gear 29, and thereafter transmitted to the transmission shaft 7 via the transmission shaft 6 in the manner described above.

Next, the case where the slide gear 29 in the speed change clutch mechanism 11 is in the neutral position and the creep path is used will be explained as follows.

The power transmitted to the input shaft 2 of the transmission 1 is transmitted to the transmission shaft 4, which becomes the input shaft 16 to the creep device 15 and meshes with a gear 47 provided on this input shaft 16 and this gear 47. A gear 48 for changing the speed, and a gear 49 interlocking therewith.
The transmission is further transmitted to a gear 50 rolling on the input shaft 16, and this gear 50 meshes with a slide gear 21 constituting a clutch mechanism 20 of the creep device 15.

This slide gear 21 is the mission 1.
is an extension of the transmission shaft 5 of the creep device 1.
5, the power from the input shaft 16 is greatly decelerated by the creep system consisting of the meshing structure of each gear, and It will be transmitted to the slide gear 21 and the output shaft 17.

Therefore, the transmission shaft 5 which is coaxial with the output shaft 17 is also connected to the transmission shaft 1 as a normal system.
Since the speed change clutch mechanism 11 built into the transmission shaft 5 is neutral at this time, this power is transmitted to each gear 43, 44 on the transmission shaft 5. and is transmitted to each gear 45, 46 on the transmission shaft 6.

The subsequent route is the same as the previous mission 1 route, and the gears 43 and 45 or the gears 44 and 46 are shifted by the gear shift operation of the gear shift clutch mechanism 12 provided on the transmission shaft 6. One of the meshing paths is selected, and the power is transmitted to the transmission shaft 6 as a larger converted power via the creep path.

Next, whether or not to use this creep path is determined by
The transmission clutch mechanism 11 is selected by a clutch mechanism 20 installed on the output shaft 17 of the creep device 15, and is incorporated in the transmission shaft 5 of the transmission 1, which is a shaft common to the output shaft 17. Simultaneous operation with (so-called double bite)
Care has been taken to ensure that this does not occur.

The clutch mechanism 20 is operated by sliding a slide gear 21, which is slidably fitted onto the output shaft 17 so as to be disengaged from a mating gear, by means of a fork 22. This is done by pushing and pulling the shaft 23. A knob 24 is fixed to the protruding end of the fork shaft 23, while a shallow groove 26a and a deep groove 26b are cut into the end of the protruding part 25 of the creep case 18, crossing each other at 90 degrees. The knob 24, and therefore the fork shaft 23, are pushed or pulled only by the protruding pin 27 being guided by these grooves 26a, 26b. A locker 28 is disposed inside the mission case 19 so as to be only rotatable relative to the wall of the mission case 19.

The locker 28 has a square shaft portion formed at the tip of the fork shaft 23 inserted into a hollow square hole formed in the axial direction.

Therefore, the rocker 28 rotates integrally with the rotation of the fork shaft 23 at the same time.

The movement of the fork shaft 23 in the axial direction with respect to the locker 28 is possible due to the structure of the square hole and the square shaft portion fitted into the hole, so that the locker 28 remains in its current position and the fork shaft 23 moves in the axial direction. , which can be moved axially.

On the other hand, the action piece 2 is attached to a part of the circumference of the rocker 28.
8a is formed, and this working piece 28a is configured to fit into a groove 31 formed on the outer periphery of the speed change fork 30 only when the speed change fork 30 is in the neutral position.

The shift fork 30 is shifted horizontally and vertically from the above-mentioned neutral position, and the shift operation of the shift fork 30 operates the slide gear 29 to shift the transmission of the mission 1.

With this structure, its operation is as follows.

First, in order to make it easier to understand the contents of the operation explanation, when the transmission fork 30 is in the neutral position, that is, in a state where there is no double engagement,
The operation of the creep system will be explained.

When you want to operate the creep system path, that is, the creep device 15, turn the knob 24 to move from the shallow groove 26a position (this position is the position where the creep device is cut) to the deep groove 26b position ( This position is the position where it is connected to the creep device.)

As a result, the knob 24 is rotated 90 degrees and moved forward a predetermined distance.

Along with this, the fork shaft 23 fixed to the knob 24 also moves forward a predetermined distance while rotating 90 degrees.

Therefore, the fork 22 fixed to the fork shaft 23 is operated to slide the slide gear 21, the clutch mechanism 20 is connected, and the creep system is operated.

At this time, the fork shaft 23 simultaneously
Since its tip also slides in the axial direction inside the locker 28 and rotates 90 degrees, the lockers 28 that are fitted into each other through the square hole and the square shaft also rotate 90 degrees. Therefore, the working piece 28a formed in a part of the circumferential direction also rotates in the same way and fits into the groove 31 of the speed change fork 30 in the neutral position.

When the actuating piece 28a is fitted into the groove 31 in this manner, the shift fork 30 is locked at its neutral position. 11 cannot operate.

Therefore, double biting in this case cannot occur.

Note that when it is desired to disconnect the operation of the creep device 15, the above procedure is reversed, that is, by pulling back the knob 24 and setting it in the shallow groove 26a, the engagement between the operating piece 28a and the groove 31 is released, and at the same time, the fork is released. 22 acts to disconnect the clutch mechanism 20.

Under this condition, the shift fork 3
0 will be released from its locked state, so transmission clutch mechanism 11 of transmission 1 will be released.
operation becomes possible.

Next, when the transmission fork 30 of the transmission 1 is not in the neutral position, that is, the transmission fork 30
is in either the left or right position, mission 1
When the shift clutch mechanism 11 of No. 1 is operating, the following occurs.

The shift fork 30 will shift left and right when it is not in its neutral position, and therefore the groove 31 will also shift its position in conjunction with the shift fork 30.

Therefore, in such a state, even if you try to operate the knob 24 from the shallow groove 26a (cutting position) to the deep groove 26b (connection position),
The operating piece 28a of the locker 28 cannot fit into the groove 31 and cannot be fitted.

Therefore, the fork shaft 23 cannot be rotated to its predetermined position, and as a result, the fork 22 cannot operate the clutch mechanism 20 either.

As a result, transmission clutch mechanism 1 of transmission
1 is activated, the clutch mechanism 20 of the creep device 15 cannot be activated and therefore no double jam occurs.

Since this invention has the above-mentioned structure and functions, the following effects can be expected.

That is, when attempting to use the creep system, the clutch mechanism 20 of the creep device 15 will not go into the "on" position unless the transmission clutch mechanism 11 of the transmission 1 is in the "neutral" position, so double engagement can be prevented in this respect. . Furthermore, when the clutch mechanism 20 is in the "on" position, the locker 28 is in the groove 31 of the shift fork 30, so the shift clutch mechanism 11 is not "engaged" in any shift position. Double biting is also prevented at points.

Furthermore, the clutch mechanism 20 of the creep device 15
is "on", transmission clutch mechanism 11 of transmission 1
As long as the other is in the "on" position, even if there is an erroneous operation or vibration of the machine, neither of them will turn the other party on, so double jamming is completely prevented from this point of view as well.

[Brief description of the drawings]

Figure 1 is a developed cross-sectional view of a power tiller equipped with a creep device according to this invention, Figure 2 is a side view of the same, and Figures 3 and 4 are cross-sectional views of essential parts showing the operational relationship of the creep device. be. Code, 1...Mission, 4, 5...Transmission shaft,
11... Speed change clutch mechanism, 15... Creep device, 16... Input shaft, 17... Output shaft, 20...
Clutch mechanism, 23... fork shaft, 28... rocker, 30... variable speed fork, 31... groove.

Claims (1)

[Claims for Utility Model Registration] The input shaft 16 and the output shaft 17 are mission 1-2.
transmission shafts 4 and 5, and the transmission shaft 1
Creep device 1 capable of creeping the transmission line of
5, the clutch mechanism 20 of the creep device 15 is configured to be "on" only when the transmission clutch mechanism 11 of the transmission 1 is set to "neutral", and the clutch mechanism 20 is turned on only when the clutch mechanism 20 is "disengaged". A double jamming prevention structure for a creep device, characterized in that a speed change clutch mechanism 11 is configured to be "in" at a speed change position. When the transmission clutch mechanism 11 of the transmission 1 is in the "neutral" position, the creep device 15 is inserted into the groove 31 formed in the transmission fork 30 of the transmission 1.
When the clutch mechanism 20 is turned on, the locker 28 externally fitted onto the fork shaft 23 of the clutch mechanism 20 rotates and engages, thereby locking the speed change clutch mechanism 11 in the "neutral" position. A double-bite prevention structure for a creep device according to claim 1, characterized in that: