JPH0730825B2 - Continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention has a plurality of taper cones to which rotational power is respectively transmitted, and rotation for extracting gear shifting power by changing a contact position of each taper cone to a tapered surface. The present invention relates to a continuously variable transmission having a member, and more particularly, to a technique for cutting off power transmission in the device.

[Conventional technology]

2. Description of the Related Art Conventionally, as a continuously variable transmission that is configured to take out shifting power by changing the contact position of a rotating member with respect to a taper cone, there is the one shown in Japanese Utility Model Laid-Open No. 63-6265, and the like. Is a structure in which a device for cutting off power is not provided in the device.

[Problems to be Solved by the Invention]

Here, in the case where the mechanism for cutting off the power is not provided like the continuously variable transmission of the above publication, for example,
When it is attempted to equip a machine body such as a cultivator and a rice transplanter, it becomes necessary to interpose a clutch in the transmission system between this device and the engine. Therefore, it is conceivable to provide a clutch inside the continuously variable transmission, but since it requires a dedicated member, it is expected to be difficult in terms of an increase in the number of parts and a complicated structure.

Therefore, an object of the present invention is to rationally configure a continuously variable transmission capable of cutting off power in the device.

[Means for Solving the Problems]

A characteristic configuration of the present invention is a continuously variable transmission that has a plurality of tapered cones to which rotational power is respectively transmitted, and has a rotating member that takes out shifting power by changing a contact position with respect to a tapered surface of each tapered cone, A transmission member that transmits rotational power to the taper cone by contact with the taper cone is provided to be switchable between a transmission position that contacts the taper cone and a transmission cutoff position that is separated from it, and an operation mechanism that adjusts the position of the transmission member is provided. The clutch operating tool and the operating mechanism are linked so that the transmission member can be forcibly switched to the transmission cutoff position by operating the clutch operating tool, and the transmission member is forcibly operated to the transmission cutoff position in response to the engine start operation. As described above, there is provided a transmission cutoff means that links the engine starting means and the operating mechanism.

[Work]

The operation of the above characteristic structure will be described with reference to FIG. 1. Paying attention to the fact that a transmission member (6) for transmitting rotational power to the tapered cone (7) by contact with the tapered cone (7) is provided, By moving the member (6), the function of the clutch that disconnects the transmission with the tapered cone (7) is revealed. Therefore, the transmission member (6) can be switched to a position separated from the taper cone (7) through the operation mechanism (B), and the cylinder shaft (17) as an output member can be operated without separately providing a dedicated clutch. The power of can be shut off.

Then, if the manipulator (22) is operated, the transmission member (6)
Since it is possible to forcibly switch the transmission to the transmission cut-off position, the transmission cut-off state can be surely expressed because the spring is not deteriorated as compared with the case where the clutch disengagement state is expressed only by the spring biasing force.

Further, since the transmission cut-off means (D) causes the transmission member (6) to switch to the transmission cut-off position when the engine is started to automatically make the vehicle in a travel-disabled state, it is unexpected that the fuselage also starts when the starter motor is rotated, for example. There will be no situation and the engine can be started well.

〔The invention's effect〕

Therefore, the power transmission can be interrupted in the device with an economical and compact mechanism by a relatively simple modification in which the position adjusting structure and the operating mechanism are added so that the position of the transmission member originally provided can be switched. In a highly reliable state where the continuously variable transmission can be reliably operated manually in the transmission cutoff state,
In addition, it was possible to provide the engine in a state in which it has excellent startability and is capable of preventing troubles when starting the engine.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1, 3, and 4 show a cross section of a continuously variable transmission, in which a transmission shaft (2) through which power is transmitted through an input pulley (1) is provided in a case (3). The sleeve member (5), which is supported in a penetrating state, transmits the power from the transmission shaft (2) to the transmission shaft (2) via the key (4), and the sleeve member (5) from the sleeve member (5). A power transmission member (6) through which power is transmitted through the automatic pressure adjusting mechanism (A) is provided in an externally fitted state, and the case (3) is provided with three taper cones (to which power from the power transmission member (6) is transmitted ( 7) is provided via a holder (8) and a swing support part (9), and a ring-shaped rotating member (10) in contact with the tapered surface (7a) of the tapered cone (7) is provided inside the case. It is provided in.

The rotating member (10) is slidably supported by a plurality of guide shafts (12) provided on the carrier (11),
The carrier (11) is rotatably supported by the sleeve member (5).

The carrier (11) has a plurality of planetary gears (14) through a plurality of first shafts (13) and a plurality of planetary gears (14) that mesh with the planetary gears (14) through a plurality of second shafts (15). Intermediate gear (1
6), each planetary gear (14) meshes with the sun gear (5g) formed on the sleeve member (5), and each intermediate gear (16) is a gear formed on the cylinder shaft (17). An output pulley (18) is provided on the cylinder shaft (17), which meshes with the portion (17g).

As shown in FIG. 2, the automatic pressure-adjusting mechanism (A) is housed in each of the plurality of concave portions (5a) formed in the sleeve member (5) and the transmission member (6) and each of these concave portions (6a). This automatic pressure adjustment mechanism (A) changes the amount of ride of the ball (19) with respect to the tapered surface of the concave portion (5a) according to the magnitude of the load. Transmission member (6)
It is configured to change the pushing force of the.

In this way, the pushing force of the transmission member (6) is adjusted according to the magnitude of the load, and the respective taper cones (7) are swingably supported, so that the respective taper cones (7) is adapted to come into contact with the rotating member (10) with an appropriate and uniform pressure.

In this device, the transmission member (6) in the transmission position is shifted to the transmission cut-off position on the sleeve member (5) side against the pressure from the automatic pressure adjusting mechanism (A), so that the transmission is performed. It is configured so that the member (6) and the taper cone (7) can be separated from each other, and further has an operation rod (20) and an operation fork (21) for canceling the transmission state, and this operation system has a clutch operation tool (22). Is associated with.

That is, the clutch operating tool (2) that is manually operated and the operating mechanism (B) described later are linked to each other, so that the clutch operating tool (2) is
The transmission member (6) can be forcibly switched to the transmission interruption position by the operation of 2).

As shown in FIG. 1, an operating groove (10a) is formed on the outer periphery of the rotating member (10), and the operating groove (10a) has a shift fork (24) linked to the gear shift operating tool (23). Is fitted.

Then, by adjusting the slide movement amount of the rotating member (10) by operating the shift fork (24), the rotation taken out by the carrier (11) changes steplessly, and this rotation and the sun gear portion ( From the relationship between the rotation speed and the relative speed of 5g), the cylinder shaft (17) is configured to output stepless speed change power from normal rotation to reverse rotation including rotation stop.

Incidentally, the end portion (2a) of the transmission shaft (2) on the output pulley side is used as an output shaft for extracting the external power.

As shown in FIG. 1, this continuously variable transmission has a ball tenant mechanism (27) for holding the operating rod (20) in a state where it is set to a position where power transmission is cut off, and also the operating rod (20). The operation fork (21) is referred to as an operation mechanism (B). In addition, the operation mechanism (B) is a gear shift operation tool (23)
Is set to the neutral position (the position where the rotation of the cylinder shaft (17) stops), the transmission member (6) is linked via the operation member (28) so as to switch to the transmission cutoff position.

Then, as shown in FIG. 1, as in the case where the continuously variable transmission is mounted on the work vehicle, the starter operation of the starter motor (30) for starting the engine is performed so as to cut off the power. ) Is provided with a solenoid (32) for forcibly operating the operating mechanism (B) by a signal from the start switch (31). That is, the engine starting means (C) and the operating mechanism (B) including the starter motor (30) and the starting switch (31) are arranged so that the transmission member (6) is forcibly operated to the transmission cutoff position in accordance with the engine starting operation. A transmission cutoff means (D) [consisting of a solenoid (32), a clutch operation tool (22) and the like] is provided for linking with the transmission.

[Another embodiment]

The clutch operating tool (22) shown in FIG. 1 can be variously implemented such as a pedal type and a lever type. Further, in the present invention, the rotating member may be formed in a disk type and the transmission member may be formed in a ring type, and the device can be used as a power source for work other than the traveling vehicle.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a continuously variable transmission according to the present invention.
The drawing is a cross-sectional view of the apparatus, FIG. 2 is a cross-sectional view showing a part of the automatic pressure regulating mechanism, FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1, and FIG. 4 is IV-IV in FIG. It is a line sectional view. (6) …… Transmission member, (7) …… Taper cone, (7a)
...... Tapered surface, (10) ...... Rotating member, (22) ...... Clutch operating tool, (C) …… Engine starting means, (B) …… Operating mechanism, (D) …… Transmission cutoff means.

Claims (1)

[Claims] 1. A rotary member (10) having a plurality of tapered cones (7) to which rotational power is respectively transmitted, and changing a contact position of each tapered cone (7) with respect to a tapered surface (7a) of the rotary member (10). A continuously variable transmission having the transmission member (6) for transmitting rotational power to the taper cone (7) by contact with the taper cone (7) from a transmission position in contact with the taper cone (7). The transmission mechanism is provided so as to be switchable to a transmission cutoff position, and an operation mechanism (B) for adjusting the position of the transmission member (6) is provided, so that the clutch operation tool (22) manually operated and the operation mechanism (B). By the linkage, the transmission member (6) can be forcibly switched to the transmission cutoff position by operating the clutch operating tool (22), and the transmission member (6) is moved to the transmission cutoff position in accordance with the engine starting operation. So that it is forced to operate
A continuously variable transmission provided with a transmission cut-off means (D) for linking the engine starting means (C) and the operating mechanism (B).