JPH04101064U - Traveling speed change structure of walk-behind work equipment - Google Patents

Abstract

(57) [Summary] [Purpose] When a walk-behind work machine is linked so that the main and sub-transmissions for traveling can be operated by a single shift lever, the shift lever for the main transmission and the sub-transmission When changing a linkage mechanism with an operating shaft for a car, it is not necessary to change the shape of a mission case near the linkage mechanism, and the linkage mechanism is made simple. [Structure] An operating shaft 27 for the auxiliary transmission 20 is projected outward from near the shift lever 26 for the main transmission 16, and by rotation of the operating shaft 27, the auxiliary transmission 20 is shifted high or low. In addition, the gear shift lever 26
A linking mechanism 33 that links the operating shaft 27 and the operating shaft 27 is provided outside the mission case 1.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a traveling speed change structure for a walk-behind work machine.

0002

[Conventional technology]

A walk-behind tiller, which is an example of a walk-behind work machine, uses a main transmission for driving. and an auxiliary transmission that can be shifted to two high and low gears are housed inside the mission case. Yes, the shift lever for the main transmission and the shift lever for the auxiliary transmission are connected to the transmission case. It extends rearward from the base.

0003

[Problem that the idea aims to solve]

The structure described above has two shift levers, so there is room for improvement in terms of operability. It can be configured so that both the main and auxiliary transmissions can be operated using the main gear shift lever. It is considered. In this case, a linkage mechanism that links the main and sub-transmission operating systems is required. It is installed inside the transmission case, and there is one gear shift lever located behind this linkage mechanism. A structure that extends the area is conceivable. However, with this structure, when changing the gear arrangement of the main and auxiliary transmissions, etc. If the linkage mechanism also needs to be changed, the mission case near this linkage mechanism should be changed. Since the shape will also have to be changed, the structure of the mission case should be flexible. There is room for improvement in terms of gender. This invention allows you to operate both the main and auxiliary transmissions with one shift lever. When configuring the mission case, the structure becomes flexible. Also, the linkage mechanism of the main and auxiliary transmissions should be configured to be simple. The purpose is to

0004

[Means to solve the problem]

The features of this invention are as follows in the traveling speed change structure of the walk-behind work machine as described above. It consists in configuring. In other words, The mission consists of a main transmission for driving and an auxiliary transmission for driving that can be shifted to two high and low gears. inside the transmission case, and move the gear lever for the main transmission from the transmission case to the rear. The operating shaft for the auxiliary transmission is projected outward from the vicinity of the gear shift lever, and the operating shaft for the auxiliary transmission is The sub-transmission device is configured so that the gears can be shifted high or low by rotating the operating shaft, and , when the gear shift lever is operated downward, the operating shaft is operated to the high speed side or low speed side, and this In such a way that the gear shift lever can be used to shift the main transmission when the shift lever is in the When the speed lever is operated upward, the operating shaft is operated in the opposite direction to that described above, and in this state, the The gear lever and operating shaft are connected so that the gear lever can be used to shift the main transmission. A linking mechanism is provided on the outside of the mission case.

[0005]

[Effect]

When configured as described above, the gear shift lever 26 can be moved as shown in FIGS. 4, 1, and 2, for example. When operated downward, the operation shaft 27 for the sub-transmission device moves at high speed due to the action of the linkage mechanism 33. It is operated to the side H, and the shift lever 26 must be operated in this lower position. This allows the main transmission to perform gear shifting operations. Contrary to the above, move the gear shift lever 26 upwards. When operated, the operation shaft 27 is moved by the action of the linkage mechanism 33 as shown in FIGS. is operated to the low speed side L, contrary to the above, and at this upper position the gear shift lever is By operating 26, the main transmission can be shifted in the same manner as described above. Ru.

[0006] As described above, the gear shift lever for the main transmission and the operation shaft for the auxiliary transmission are linked. If a linkage mechanism is provided outside the transmission case, for example, the main and sub-transmission If you change the arrangement of the gears on the machine and it becomes necessary to change the linkage mechanism, this linkage Only the engaging mechanism needs to be changed; there is no need to change the shape of the mission case in this area. The point is gone. Since the operating shaft for the auxiliary transmission is a rotary operating type, the gear lever and If the operating shafts are arranged almost parallel to each other, it can be moved forward using a simple flexible rod, etc. This allows the above-mentioned linkage mechanism to be constructed.

[0007]

[Effect of the idea]

As described above, the main and auxiliary transmissions are operated by one gear shift lever. In this case, even if it becomes necessary to change the above-mentioned linkage mechanism, the mission case Since there is no need to change the shape of the Ta. In addition, this linkage mechanism can be simply constructed using a simple rod with flexibility. Since this is possible, it is also advantageous in terms of reducing the number of parts and reducing costs.

[0008]

【Example】

Hereinafter, embodiments of the present invention will be described based on the drawings. As shown in Figure 6, the engine 2 and the mission case are installed at the front of the mission case 1. 1, and a rotary tilling device 4 is installed at the rear of the transmission case 1. At the same time, the control handle 5 is extended rearward from the top of the mission case 1. It constitutes a walking type work machine.

[0009] Next, the structure inside the mission case 1 will be explained. As shown in Figure 5, Power from the engine 2 is transmitted to the input shaft 6 via the transmission belt V shown in FIG. B A first shift gear 8 and a second shift gear are connected to the PTO shaft 7 for transmitting power to the rotary tillage device 4. A gear 9 is fitted externally with a spline structure so that it can be slid freely, and the gear 9 is attached to the input shaft 6. The first shift gear 8 is always engaged with the gear 10. With the above structure, the first shift gear 8 is connected to the second gear 13 or 3 of the first transmission shaft 11. By engaging the speed gear 24, the second shift gear 9 can also be engaged with the first gear 12. By combining these, forward power is shifted to three stages and transmitted to the first transmission shaft 11. It will be done. The second shift gear 9 is connected to the gear 1 externally fitted on the input shaft 6 so as to be relatively rotatable. 4, the power for reversing is transmitted to the first It is transmitted to the transmission shaft 11. As described above, the main transmission 16 has three forward speeds and one reverse speed. is configured. In this case, depending on the operating position of the first and second shift gears 8 and 9, With a constant transmission ratio between gear 10 and first shift gear 8, forward rotational power is transferred to the PTO shaft. 7.

0010 The third shift gear 18 has a spline structure on the second transmission shaft 17 and is automatically slidable. It is currently fitted externally. This third shift gear 18 is connected to the second gear 13 of the first transmission shaft 11. Or, by engaging the gear 19, the power from the first transmission shaft 11 can be divided into two stages, high and low. The speed is changed and transmitted to the second transmission shaft 17. As described above, you can shift to two high and low gears. A sub-transmission device 20 that can perform the following functions is configured. The power from the second transmission shaft 17 is then is transmitted to the left and right axles 23 via the idle clutch 21 and the planetary reduction mechanism 22. It is.

[0011] Next, slide operation of the first and second shift gears 8, 9 of the main transmission 16, and The structure of the sliding operation of the third shift gear 18 of the sub-transmission device 20 will be explained. As shown in FIGS. 1 and 6, the support case 25 fixed to the mission case 1 A shift lever 26 for the main transmission 16 is supported so as to be operable vertically and horizontally. strange An operating shaft 27 for the sub-transmission device 20 is rotatably supported on the lower side of the speed lever 26. By rotating the operating shaft 27, the operating arm 27a of the operating shaft 27 is rotated. , slide the shift fork 28 for the third shift gear 18 of the sub-transmission device 20. Manipulate.

0012 As shown in FIGS. 1 and 3, the outer end of the mission case 1 at the operating shaft 27 An operating arm 27b is fixed to the operating arm 27b and the operating shaft 27. A stopper 30 and a toggle spring 31 that stop the It is provided. Inside the support case 25, a ring-shaped series with a square hole 29a is installed. A connecting member 29 is arranged, and the gear shift lever 26 passes through the square hole 29a of the connecting member 29. ing. The linking rod 32 extends between the linking member 29 and the operating arm 27b. It is being constructed. In the manner described above, the gear shift lever 26 and the operating shaft 27 are linked. A linkage mechanism 33 is configured inside the support case 25 outside the mission case 1. Ru.

[0013] The state shown in FIGS. 1, 2, and 3 means that the gear shift lever 26 is in the position shown in FIG. The operating shaft 27 for the sub-transmission device 20 is This is a state in which the vehicle is operated to the low speed side L. In the above condition, move the gear shift lever 26 to the lever position. When the shift lever 26 is operated to the F1 and R1 positions of the shift lever 26, the end of the shift lever 26 shifts to the second shift gear. The second shift gear 9 slides by deeply engaging the lower side of the shift fork 35 for gear 9. The shift lever 26 is moved to the F2 and F3 positions of the lever guide 34. When the shift lever 26 is opened, the end of the shift lever 26 is connected to the shift fork 36 for the first shift gear 8. By lightly engaging the lower side, the first shift gear 8 is slid. and, Since this shift lever 26 is operated within the square hole 29a of the linking member 29, The operating shaft 27 for the transmission 20 is held on the low speed side L.

[0014] Next, from the above state, operate the gear shift lever 26 to the lower half of the lever guide 34. As shown in FIG. 4, the linking member 29 is pushed up by the gear shift lever 26 and The operating shaft 27 for the speed device 20 is operated to the high speed side H. In this condition, the gear shift lever When the bar 26 is operated to the F4 and R2 positions of the lever guide 34, the shift lever 26 The end lightly engages the upper side of the shift fork 35 for the second shift gear 9 and The gear 9 is slid, and the gear shift lever 26 is moved from the lever guide 34. When operated to the F5 and F6 positions, the end of the gear shift lever 26 shifts to the first shift gear 8. The first shift gear 8 is slid by deeply engaging the upper side of the foot fork 36. It is. The shift lever 26 is operated within the square hole 29a of the linking member 29. Therefore, the operating shaft 27 for the auxiliary transmission 20 is held on the high speed side H.

[0015] [Another example] In the embodiment described above, when the gear shift lever 26 is operated to the upper half of the lever guide 34, When the operating shaft 27 is moved to the low speed side L and the gear shift lever 26 is moved to the lower half of the lever guide 34, Then, the operating shaft 27 was configured to be operated to the high speed side H, but if this relationship is reversed, When the gear shift lever 26 is operated in the upper half of the lever guide 34, the operating shaft 27 is moved to the high speed side H. When the gear shift lever 26 is operated to the lower half of the lever guide 34, the operating shaft 27 moves to a low speed. It may be configured to be operated to the side L. Furthermore, in the structure of FIG. 1, a support case 25 is provided that covers the linkage mechanism 33; Frame that supports only the ball joint of the gear shift lever 26 for the main transmission 16 A mechanism (not shown) is provided so that the linkage mechanism 33 is exposed outside the mission case 1. It is also possible to have a structure in which

[0016] In addition, in order to facilitate comparison with the drawings, symbols are written in the scope of claims for utility model registration. However, the present invention is not limited to the configuration shown in the attached drawings.

[Brief explanation of drawings]

[Fig. 1] Side view of the base of the gear shift lever for the main transmission, the operating shaft for the auxiliary transmission, and the vicinity of the linkage mechanism.

[Figure 2] Front view of the lever guide of the gear shift lever for the main transmission

[Figure 3] Front view of the vicinity of the linkage mechanism with the main transmission gear shift lever being operated in the upper half of the lever guide

[Fig. 4] Front view of the vicinity of the linkage mechanism with the main transmission gear shift lever operated in the lower half of the lever guide

[Figure 5] Schematic vertical cross-sectional front view of the mission case

[Figure 6] Overall side view of walk-behind work machine

[Explanation of symbols]

1 Mission case 16 Main transmission 20 Sub-transmission device 26 Shift lever for main transmission 27 Operation shaft for sub-transmission 33 Linkage mechanism H High speed side of operation axis L Low speed side of operating shaft

Claims (1)

[Scope of utility model registration request] 1. A main transmission for driving (16) and a sub-transmission for driving (20) capable of shifting into two high and low gears are installed in a mission case (1), and the main transmission (16) The transmission lever (26) for the auxiliary transmission (20) is extended rearward from the transmission case (1), and the operation shaft (26) for the auxiliary transmission (20) is
7) is configured to protrude outward from the vicinity of the speed change lever (26) so that the auxiliary transmission (20) can be shifted in a high or low direction by rotating the operation shaft (27); When the gear shift lever (26) is operated downward, the operating shaft (27) is operated to the high speed side (H) or the low speed side (L), and in this state, the main transmission (16) is operated by the gear shift lever (26). to enable gear shifting operations, and
When the shift lever (26) is operated upward, the operating shaft (27) is operated in the opposite direction to that described above, and in this state, the shift lever (26) can be used to shift the main transmission (16). A traveling transmission structure for a walking type work machine, in which a linkage mechanism (33) for linking the speed change lever (26) and the operation shaft (27) is provided outside the transmission case (1).