JPS6268134A - Traveling transmission - Google Patents

Abstract

PURPOSE:To permit the smooth speed change operation by separating a subtransmission into a low speed gear mechanism in plural stages corresponding to the working traveling and a high speed gear mechanism corresponding to the road traveling and adopting a hydraulic clutch mechanism for a low speed gear mechanism. CONSTITUTION:In the captioned apparatus, a main speed change apparatus 17 which performs the speed change operation in plural stages by feeding pressurized oil selectively into a plurality of hydraulic clutches 20a-20d installed for a plurality of always meshing type gear mechanism 27 and a subspeed change apparatus 16 which performs speed change in plural stages are installed in series. With such constitution, the subspeed change apparatus 16 is equipped with an always meshing type low speed gear mechanism 3 which performs speed change in two stages by the selective input/output operation of the hydraulic clutches 6a and 6b and a high speed gear mechanism 5 which can be input/ output-operated by a clutch sleeve as a mechanical clutch mechanism 4, between an input shaft 10 and the first transmission shaft 1 opposed to the input shaft 10.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used by being mounted on, for example, a combine harvester, and more specifically, the present invention is used by being mounted on a combine harvester, etc. a main transmission device capable of selectively supplying pressure oil to the hydraulic clutch of the main transmission device to perform multi-stage gear shifting operations;
The present invention relates to a traveling transmission in which a sub-transmission device capable of shifting into multiple stages is provided in series.

[Conventional technology]

In this type of traveling transmission, conventionally, the auxiliary transmission includes a gear type shift sleeve having eight gear parts and eight gears that selectively engage with the gear type shift sleeve on the same transmission shaft. It was set up in (For example, Japanese Utility Model Application Publication No. 59-181821) [Problem to be solved by the invention] However, when traveling at low speed, the operator is required to perform not only a traveling speed change operation but also a combine harvester, etc. If so, the operation would be complicated because it would also involve operating the shelling and reaping latch and lifting and lowering the reaping section. In addition, the switching operation of the auxiliary gear while driving for work requires the main clutch to be disengaged as the auxiliary gear transmits the switching transmission through the shift sleeve. , which made the operation even more complicated.

Furthermore, in order to shift the sub-transmission, the main clutch must be disengaged, and the sub-transmission's "low"
In remote areas, the working speed is set to be lower than the road speed, so every time the clutch is operated, the aircraft will momentarily stop, and when the clutch is engaged again, the speed change speed will change. As a result, the speed difference between them was large and the shift shock was large.

An object of the present invention is to provide a gear shifting operation that can be performed easily, quickly, and without shock, with improved safety, by changing the clutch mechanism.

[Means for solving inter-color points]

Features 41 of the present invention include a high-speed gear mechanism that can be controlled by a mechanical clutch mechanism, and a plurality of hydraulic clutches that selectively supply pressurized oil to perform multi-speed gear shifting operations. The main feature is that it is constructed with a permanent bite-type low-speed gear mechanism, and its effects are as follows.

[For production]

In other words, by separating the auxiliary transmission into a multi-stage low-speed gear mechanism that is compatible with working driving and a high-speed gear mechanism that is compatible with road driving, and by adopting a hydraulic clutch mechanism for the low-speed gear mechanism, it is possible to maintain low-speed driving. Since non-clutch gear shifting is possible even when driving during work, gear shifting shock can be sufficiently suppressed, and gear shifting can be done simply by operating the gear shifting lever. .

Moreover, when changing gears in high-speed driving situations such as on the road, a mechanical clutch mechanism must be operated to engage and disengage the high-speed gear mechanism, so it is necessary to suddenly change from a low-speed state to a high-speed state or the opposite state. When switching, the main clutch must be disengaged before operation. Therefore, when shifting to a high-speed state, the operation becomes complicated, but clear awareness of the operator is required, so that an unexpected shift to a high-speed state can be prevented.

〔Effect of the invention〕

As a result, the burden of shifting gears during work driving can be reduced, and compared to a system in which the entire high and low speed gear mechanism of the auxiliary transmission is switched by a hydraulic clutch, there is no need to accidentally shift to a high speed range, resulting in superior safety. Moreover, there is no need to frequently use expensive hydraulic clutches.

〔Example〕

A traveling transmission device used in a combine harvester will be explained.

Figure 1 shows an outline of the transmission system, and the output from the engine (8) mounted on the traveling vehicle body is branched into a transmission VJ system to the shelling device (2) and a transmission system for traveling and reaping part assembly. . The latter branch output is transmitted to the input shaft (10) of the traveling transmission case (9) by a belt via a tensile clutch-type running latch, and then is further branched to the traveling system and the reaping section transmission system. be done.

In other words, a part of the power of the input shaft f101 is taken out to the PTOI [1ltl] via the gear transmission, and from there is input to the reaping section (7) via the tensile clutch type reaping latch (14). The belt is transmitted to the shaft.

Also, part of the power of the mission case input shaft DO) is 8
Transmission is transmitted to the left and right axles via the auxiliary transmission (I-4, main transmission 97 with 8 forward speeds and 1 reverse speed) and the steering clutch 087 (1 m).

The main transmission 07) includes a multi-disc hydraulic clutch (20a) in the transmission system of a regular gear mechanism forming each gear stage.

Incorporating (20b), (20c), and (20cl), respectively,
Pressure oil is alternatively supplied to these hydraulic clutches (20a), (20b), etc. from a hydraulic pump A interlocked with the PTOIdN13) of the transmission case (9),
It is configured as a hydraulically operated traveling transmission that performs transmission at a desired gear position.

The main transmission η is operated only by operating a control valve υ incorporated in the clutch operating hydraulic circuit (a) shown in FIG.

In other words, control valve @phantom (Fl), (F2), (F8)
By switching to position (2), the hydraulic clutch for 1st forward speed (20a), the hydraulic clutch for 2nd forward speed (20b), and the hydraulic clutch for 8th forward speed (20C)
Pressure oil from the hydraulic pump (to) is alternatively supplied to the reverse hydraulic clutch (20d), and the gear shift state of the transmission system with the clutch engaged is obtained, and the control valve Aji υ is set to Fully hydraulic clutch (20a) by switching to the position
(20b) A neutral stopping state can be obtained by removing the pressure oil and cutting off the transmission.

In addition, a modulating pulse generator is connected to the primary side of the control valve υ, which suppresses the sudden increase in clutch operating pressure when the gear is shifted from the neutral position, thereby alleviating the shock of starting. I'm here.

The sub-transmission device ul will be explained in detail. As shown in FIG. 1, a hydraulic clutch (6a) (6
Choice of b) - Full-length low-speed gear machine 1m t3+ that can be shifted to two stages by on/off operation and mechanical clutch at! (41
Large hydraulic clutch (6
a) It is possible to switch between two states: (6b), which engages with the clutch casing, and the high-speed gear, which engages with (5a). Then, with the clutch sleeve (4) engaged with the hydraulic clutch (6aX6b), the switching pulp (to) separated in the pressure oil supply circuit from the hydraulic pump to the control valve 1 is connected to the hydraulic clutch. By switching the control lever 4, it is possible to display a medium speed state and a low speed state as an auxiliary transmission device (c+T). However, the latch (main clutch) that runs when turning on and off the high-speed gear mechanism (6)
However, the gear shifting operation of the main transmission Oη and the low speed range shifting operation of the auxiliary transmission Oη can be performed directly regardless of the running latch.

[Another example]

(2) The sub-transmission device tlE9 may be as follows. As shown in Fig. 3, the hydraulic clutch (6a) (
The clutch housing (6b) is spline-fitted to the input shaft, and a latch sleeve (4) is provided so that it can freely engage and disengage from the high-speed gear (5a).
Mechanical clutch mechanism switching operation lever (2) that slides and operates the
Switching the Shu to the hydraulic clutch (6a) (6b) Pulp (
(to) may also be used as the operating lever for operating. However, in this case, the switching pulp □□□ is an 8-position switching type as shown in the figure, and if the high-speed gear mechanism (6) is operated by a person, the pressure oil in the hydraulic clutches (6a) and (6b) should be It has become.

@ Above 8! Some transmissions may be applied to work vehicles or other civilian vehicles.

[Brief explanation of drawings]

The drawings show an embodiment of the traveling transmission according to the present invention, @1
2 is a diagram of the overall configuration, FIG. 2 is a hydraulic operation circuit diagram, and FIG. 3 is a schematic diagram of another embodiment of the sub-transmission device. (3)...Low speed gear mechanism, (4)...
Mechanical clutch mechanism, (6)...High speed gear mechanism, (6a)...Hydraulic clutch, Oφ...Sub-transmission device, 藺...Main transmission device, ( 20a)...
・Hydraulic clutch, □□□...gear mechanism.

Claims (1)

[Claims] A main unit that can selectively supply pressure oil to a plurality of hydraulic clutches (20a) provided respectively to a plurality of permanent-bite gear mechanisms (27) to perform multi-speed gear shifting operations. In a traveling transmission in which a transmission (17) and an auxiliary transmission (16) capable of shifting to multiple speeds are provided in series, the auxiliary transmission (16) is turned on and off by a mechanical clutch mechanism (4). a high-speed gear mechanism (5), and a constant-bit type low-speed gear mechanism (3) that can selectively supply pressure oil to multiple hydraulic clutches (6a) to perform multi-speed gear shifting operations. ).