JPS6343050A - Power transmission structure - Google Patents

Abstract

PURPOSE:To reduce the shock in a transmission system at the time of speed change, in a power transmission structure to be used for an agricultural tractor or the like, by making it possible to change over a hydraulic auxiliary speed- change mechanism provided between a main clutch and a main transmission to the neutral condition. CONSTITUTION:When a pressure oil is supplied to the first hydrauslic clutch 13, an output gear 12 and an input shaft 6 are integrated, and the power from an engine is transmitted to an input gear 16 flxed on an output shaft 14 via an intermediate gear 24 through the output gear 12 so as to bring about a low-speed condition. In the second hydraulic clutch 15, the first operating disk 25 and the second operating disk 27 are provided. Accordingly, while the supply of pressure oil is cut off, the clutch 15 is in an in condltion by the energizing force of disc springs 17, so that the input shaft 6 and the output shaft 14 are directly coupled to bring about a high-speed condition, and when the supply of pressure oil is restored, the clutch 15 becomes in an off condition. In other words, by cutting off the pressure oil to the clutch 13 and supplying the pressure oil to the clutch 15, the neutral condition of a auxiliary speed-change mechanism 4 can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] What has not yet been invented is a power transmission structure used in, for example, agricultural tractors, and more specifically, a power transmission structure that transmits power from an engine to a main clutch. The present invention relates to a power transmission structure in which a hydraulic auxiliary transmission mechanism is provided between a main clutch and a main transmission mechanism in a transmission system configured to transmit power to a main transmission mechanism through a transmission mechanism.

[Conventional technology]

In the power transmission structure, conventionally, even if the main clutch TA is changed and the main transmission mechanism is shifted, the gear shift state m of the hydraulic sub-transmission mechanism is maintained as it is.

[Problem that the invention seeks to solve]

Next, in this case, even if the main clutch is disengaged and the main transmission mechanism is in the middle of a gear shift in the neutral state, the auxiliary transmission mechanism is in a rotating state, so the hydraulic gauging that constitutes the auxiliary transmission mechanism The large inertial force caused by these factors increases the shock during gear shifting that occurs when the main clutch re-engages.

The object of the invention is to provide a device that can alleviate the shock during gear shifting by simply modifying the sub-transmission mechanism.

[Means for solving problems]

The characteristic configuration of the unreleased 13AVc is: ■ The hydraulic sub-transmission mechanism is set in a neutral state; ■ The hydraulic sub-transmission mechanism is provided with a mechanism that switches the hydraulic sub-transmission mechanism to a neutral state in conjunction with the disengagement operation of the main clutch. Its effects are as follows.

[For production]

According to characteristic configuration ■, it is possible to disconnect the power transmission between the output shaft that transmits to the main transmission mechanism in the sub-transmission mechanism and the input shaft that transmits to the main clutch, so it is possible to disconnect the transmission between the output shaft that transmits to the main transmission mechanism and the input shaft that transmits to the main clutch. Since power transmission between the hydraulic auxiliary transmission mechanism, that is, the hydraulic casing, and the main transmission mechanism is cut off, the auxiliary transmission mechanism is in a neutral state even when a gear change is performed in the main transmission mechanism, so that the transmission shock is alleviated. can.

〔Effect of the invention〕

The operating feel can be improved by alleviating the shift shock, and the modification for this purpose can be as simple as installing the hydraulic sub-shift mechanism in the neutral state 1.

〔Example〕

To explain the sub-transmission mechanism based on the power transmission structure used in agricultural tractors, power from the engine (1) is transferred to the main transmission mechanism (3) via the main clutch (2).
At the same time, transmission is transmitted to the main clutch 12 + transmission mechanism (3) through an auxiliary transmission mechanism (4) which is provided between the transmission mechanism (3) and capable of switching between high speed, low speed and neutral state. It is now possible to do so.

As shown in FIG. 1, the main clutch (2) is connected to the Pro system transmission shaft 151K, which is supported on the outer surface of the input shaft (6), and also has an input shaft (6) that acts on the clutch body (not shown). It includes a clutch sleeve (7) that is externally slidably movable in the axial direction, and a shift fork (81) for the clutch sleeve ().
Grease lubrication Filt+a+ for 7) passes through the partition wall compartment separating the hydraulic auxiliary transmission mechanism (4) chamber and the main clutch (2) chamber, and reaches the clutch sleeve [71K] via the joint vibrator (9). It is formed in the state. The grease supply path (81K $>^ is provided at the entrance part 11(a')' separate from the refueling port, and the ball piston (101@) is inserted into this inlet oil path (a') to prevent car body disturbances, etc. As a result, the inlet oil path (a') t-ball piston that reciprocates +10
The structure is such that a pushing action to supply the Goose T clutch sleeve (71K) can be automatically performed by the pushing action against the grease of No. 1.

Next, the sub-transmission mechanism +41 will be explained in detail. As shown in FIG. 1, a hydraulic clutch casing (Ill?I) is fixed to the input shaft (6) so as to be integrally rotatable, and
A first hydraulic clutch 04 of a friction multi-plate type is provided between the output gear α2 and the hydraulic clutch gauging (11), which is loosely fitted to the input shaft (6), and whose axis is aligned with the input shaft (6). In the following state, a second hydraulic clutch α51 = i of the multi-plate type is provided between the output shaft 04) and the clutch casing (11), which are arranged in the same manner. Then, when pressure oil is supplied to the first hydraulic clutch 03, the output gear 021 and the input shaft (6) are integrated, and the power from the engine (1) is transmitted from the output gear (121) to the input shaft (61). The relay gear (2) attached to the relay shaft (not shown) is fixed to the output shaft (output shaft) and is transmitted to the mental input gear O@, thereby creating a low speed state.

Next, the second hydraulic clutch! Iω is the 1st f11rIJ that operates to press against the friction plate ends t by the horn spring αη.
The first operating disk (to) is integrally connected via the first operating disk (to) and the hydraulic piston (to) e211, and the hydraulic piston (to)
C) a first actuating disk actuated in the direction of releasing the biasing force of the counter spring (L71) is provided, and is in the engaged state m while the pressure oil supply is cut off by the biasing force of the counter spring Oη; The input shaft (6) and the output shaft (141) are directly connected to produce a high-speed state, and are configured to shift to a disengaged state by supplying pressure oil, and the first hydraulic clutch (
13 and the opposite operation 1lJ21F- for the pressure oil supply.

Therefore, the pressure oil to the first hydraulic clutch a3 is cut off, and the second
By supplying pressure oil to the hydraulic clutch αω, a neutral state of the auxiliary transmission mechanism (4) can be obtained. gFI
As shown in Fig. g, in addition to providing a solenoid valve for controlling the pressure oil to the hydraulic clutch (131, αD), this solenoid valve α91 is used to control the high-speed state and low-speed state of the sub-transmission mechanism (4). The changeover switch (20)' is provided so as to be operable by looking at the auxiliary transmission lever, and the operation of the limit switch is controlled by the opening operation lever of the main clutch (2) as a mechanism for switching the auxiliary transmission mechanism (4) to the neutral state. This is how it should be structured.

[Another example]

■ The switching mechanism ＠υ may be one that mechanically links the operating bar for the main clutch (2) and the spool of the solenoid valve α (to).＠ This type of power transmission structure is applicable to vehicles other than agricultural tractors. It may also be applied to other agricultural machinery and general vehicles.

θ First hydraulic clutch (I31 and second hydraulic clutch 05
) means that the clutch is engaged by supplying pressure oil! IBI/c9Q
Alternatively, the clutch may be switched to the disengaged state by supplying pressure oil.

[Brief explanation of the drawing]

The drawings show an embodiment of the power transmission structure according to the great invention, and the first
The figure is a longitudinal side view showing the auxiliary transmission mechanism, Figure 2 is a hydraulic circuit diagram for the auxiliary transmission mechanism hydraulic clutch, and Figure 3 is an overall schematic configuration diagram. (Summer)...Engine, (21...Main clutch, (3)...Main transmission mechanism, (4)...Hydraulic sub-transmission mechanism, Qυ...
... Mechanism for switching to neutral state.

Claims (1)

[Claims] A hydraulic system is used between the main clutch (2) and the main transmission mechanism (3) in a transmission system configured to transmit power from the engine (1) to the main transmission mechanism (3) via the main clutch (2). The power transmission structure is provided with a sub-transmission mechanism (4) of the main clutch (2).
) A power transmission structure is provided with a mechanism (21) that switches a hydraulic sub-transmission mechanism (4) to a neutral state in conjunction with a switching operation.