JPH034064A - Belt type continuously variable transmission - Google Patents

Abstract

PURPOSE:To acquire three modes with one rotary shaft in speed change and the other rotary shaft in fixed speed, with both the shafts in speed change and with both the shafts in fixed speed by constituting the first rotary shaft for driving a wheel or the like and the second rotary shaft for driving a power takeoff (PTO) shaft with a double-shaft structure utilized and providing a clutch means between both the rotary shafts. CONSTITUTION:Connection and release of first and second rotary shafts 17, 18 are performed by a clutch 29, and by a condition of release, drive power from an engine 1 is transmitted to a pulley 3, belt A, pulley 16, first rotary shaft 17 and to a speed change mechanism 13 to speed change-drive a wheel 12. While large drive power, transmitted to the variable pulley 3, pulley 7, belt B, pulley 19, second rotary shaft 18 and a transmitting mechanism 15, drives a power takeoff shaft 14 at a fixed speed. Both the rotary shafts 17, 18 are connected, when a belt tensioner 21 is pressed to release pressing of a belt tensioner 22, both the rotary shafts 17, 18 are in a belt A system, that is, speed change-driven, and when the pressing of the belt tensioners 21, 22 is reversed to the above described, both the rotary shafts are in a belt B system and driven at a fixed speed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a belt type continuously variable transmission having an output output shaft (hereinafter referred to as a PTO shaft).

(Prior Art) Belt type transmissions have conventionally been used in agricultural machinery such as tillers and management machines, as described in, for example, Japanese Utility Model Application Publication No. 63-171752.

Furthermore, among such belt-type transmissions, one is known that is provided with a PTO shaft for extracting output and driving external equipment.

(Problem to be Solved by the Invention) However, in such a transmission, the drive shaft and the PTO shaft are driven by the same transmission mechanism, so when the vehicle speed is changed, the rotational speed of the PTO shaft also changes. Unable to handle a wide variety of tasks.

Therefore, it may be possible to provide a dual transmission mechanism, but
In this case, two transmission mechanisms are arranged in parallel, which increases the size of the transmission itself.

The present invention has been made in view of these points, and an object of the present invention is to provide a belt-type continuously variable transmission that can rotate a PTO shaft in various ways without increasing the size.

(Means for Solving the Problems) The present invention utilizes a dual shaft structure to configure a first rotating shaft that drives a wheel or the like and a second rotating shaft that drives a PTo shaft,
A clutch means is interposed between the two rotating shafts.

Specifically, a variable pulley mechanism is constructed by winding a belt between a variable pulley on the driving side and a pulley on the driven side, which are made up of a movable sheave and a fixed sheave. A transmission mechanism is constructed by winding a belt between a drive-side pulley and another driven-side pulley attached to the transmission belt, and a belt tensioner is applied to each of the speed change belt and the general belt. A cylindrical second rotating shaft is rotatably fitted on the outside to form a double shaft structure, and a clutch means is interposed between the first and second rotating shafts, and the first or second rotating shaft A driven pulley of the variable pulley mechanism is attached to one of the shafts, a driven pulley of the transmission mechanism is attached to the other, and the other of the first or second rotating shaft is linked to the output output shaft. It is characterized by:

(Function) A cylindrical second rotating shaft is located outside the first rotating shaft, so that it does not take up space, and when the clutch means is in a disconnected state, the first rotating shaft receives the driving force of the PTO shaft or the drive shaft. One is a second rotating shaft, and the other of the driving force of the PTO shaft or the drive shaft is transmitted.

When the first rotating shaft and the second rotating shaft are connected by the clutch means, the first and second rotating shafts are rotated in a variable speed manner via a variable pulley mechanism using a variable speed belt by releasing the suppression by the belt tensioner of the general belt. Ru. Further, by releasing the pressure on the speed change belt by the belt tensioner, the first and second rotating shafts are rotated at a constant speed via a transmission mechanism using a general belt.

(Example) Examples of the present invention will be described in detail below with reference to the drawings. A belt type transmission 101 according to the present invention is applied to a tiller 102 as a working machine, as shown in FIG.

In FIG. 1 showing the overall configuration, 1 is an engine, 2 is an output shaft of the engine 1, and a drive-side variable pulley 3 for a speed change belt A is attached to the output shaft 2. The variable pulley 3 is composed of a fixed sheave 4 and a movable sheave 5, and an idling bearing 6 is disposed between the sheaves 4 and 5. Therefore, the general belt B is attached to the upper end of the fixed sheave 4.
A pulley portion 7 for use is formed.

Reference numeral 11 denotes a transmission unit, which includes a transmission mechanism 13 for driving wheels 1.2, 1.2 and a PTO inside a unit case lla.
A rotation mechanism 15 that rotates one axis four times is provided.

The driven pulley 16 of the variable pulley 3 is connected to the first rotating shaft 1
7, and a gear 14 linked to the transmission mechanism 13 is attached to the first rotating shaft 17. Further, a second rotating shaft 18 is rotatably supported on the outside of the first rotating shaft 17 via a bearing 8°8, and a pulley 19 on the driven side of the pulley portion 7 is mounted at one end of the second rotating shaft 18. A gear 20 connected to the rotation mechanism 15 is attached to the other end.

Furthermore, belt tensioners 21 and 22 are provided for the belts A and B. However, the speed change belt A
The belt tensioner 2 on the side changes the tension of the belt A in accordance with changes in the pulley pitch diameter of the variable pulley 3.

The belt tensioner 22 on the general belt B side is linked to an operation system (not shown), and has two positions: one in which the PTO shaft is pressed strongly against the general belt B, and the other in four positions, in which the PTO shaft is not pressed strongly against the general belt B. It is designed to take the drive position.

23, 24, 25, and 26 are bearings, respectively, which are attached to the unit case lla, and rotatably support the second rotating shaft 18, the first rotating shaft 17, and the shaft 13a of the 4-speed transmission mechanism 13 including one PTO shaft. There is.

29 is a clutch means that connects the first rotating shaft 17 and the second rotating shaft 1;
This is to connect and disconnect with 8.

With the above configuration, when the clutch means 29 is in the disconnected state, the engine 1, the variable pulley 3, the belt A,
The driving force of the wheels 12.12 is transmitted through the pulley 16, the first rotating shaft 17, and the transmission mechanism 13. On the other hand, from the engine 1 through the variable pulley 3, pulley part 7, belt B, pulley 19, second rotating shaft 18 and transmission mechanism 15, a transmission system different from the transmission system of the driving force of the wheels 12.12,
A driving force for driving external equipment is transmitted to the PTO shaft 14.

As a result, since the pulley portion 7 has a constant pitch diameter, a change in the pitch diameter of the variable pulley 3 causes the wheel 12 to change.
Even if the vehicle speed 12 changes, the PTO shaft 14 rotates at a constant rotation speed.

In addition, when the first rotation shaft 17 and the second rotation shaft 18 are connected, when the belt tensioner 21 is pressed and the belt tensioner 22 is released from the belt tensioner 22, both rotation shafts 17.1
8 is rotated by the engine 1 via a variable pulley mechanism consisting of a variable boolean 93, a belt A, and a pulley 16, and is driven at variable speeds according to a pulley ratio set by the variable pulley 3. Also, when the belt tensioner 22 is pressed and the belt tensioner 21 is released from the belt tensioner 21, both rotating shafts 17 and 18 are connected to the variable pulley 3, the pulley part 7, and the belt B.
It is rotated by the engine 1 via a transmission mechanism consisting of a pulley 19 and a pulley 19, and is driven at a constant rotational speed.

In this way, the clutch means 29 and the belt tensioner 21
．． 22, ■ a mode in which the first rotating shaft 17 is driven at a variable speed and a second rotating shaft 18 is driven at a constant speed, and ■ both rotating shafts 17.
．． Mode in which both 18 are driven at a constant speed, ■Both rotating shafts 17.
18 can also be in a variable speed drive mode.

In the above embodiment, the pulley part 7 is formed in a part of the fixed sheave 4, but as shown in FIG.
A pulley 32 for rotating the PTO axis is attached, a pulley 34 on the driven side of the first rotating shaft 17, a part of which becomes the PTO axis 33, and a pulley 34 on the driven side of the second rotating shaft 18 are attached to the wheels 12 and 12 on the driven side of the driving side. The pulleys 35 may be attached respectively.

The mechanism shown in FIG. 2 is specifically shown in FIGS. 3 to 5.

In the drive-side variable pulley 30, as shown in FIGS. 6 and 7, both the fixed sheave 31 and the movable sheave 36 have a sheave surface 37a that serves as a pulley surface.

The fixed sheave 3 consists of a sheave part 37.38 having a diameter of
While the cylindrical part 40 of 1 is fitted and fixed to the pulley shaft 39,
A cylindrical portion 41 of the movable sheave 36 has an engagement groove 44 that engages with a guide pin 43 that protrudes radially outward from a cylindrical member 42 fixed to the pulley shaft 39, and is engaged with the guide pin 43. The engagement relationship with the matching groove 44 allows the pulley to move only in the axial direction of the shaft 3. The cylindrical member 42 and the movable sheave 3
A sealing material 45, 45 is interposed between the cylindrical portion 41 of No. 6 and the cylindrical portion 41 of No. 6.

A mounting member 46 is fitted and fixed to the end of the cylindrical member 42, and a bearing 47 (bearing ) are provided. A roller stand 48 is attached to the bearing 47, and a roller 49 is rotatably supported on the roller stand 48.

On the other hand, a bearing 50 is attached to the cylindrical portion 41 of the movable sheave 36, and a cam member 51 is attached to the outside of the bearing 50. The cam member 5 is provided with a protrusion 52 that is linked to the operating system, and by rotating the cam member 51, the cam surface of the cam member 51 engages with the roller 49 and moves in the axial direction. It is designed to change the pulley pitch diameter. The belt tensioner 52 uses the spring 54 so that the tension on the belt A by the belt tensioner 52 changes in accordance with the change in the pulley pitch diameter.
It is designed to rotate against the spring force of.

Further, the belt tensioner 53 on the general belt B side is linked to an operating lever 57 via a spring 55 and a lap 56, and when the operating lever 57 is operated, the belt tensioner 53 on the general belt B side is
The driving position P1 of the PTO shaft 33 is strongly pressed against the
The non-driving position P2 of the PTO shaft 33 is set so that the general belt B is not strongly pressed.

The driven pulley 35 includes a disc-shaped plate part 35b with a plurality of hollow holes 35a interposed therein, a pulley part 35c attached to the outside of the disc-shaped plate part 35b, and a cylindrical part attached to the inside of the plate part 35b. The cylindrical portion 35d is fitted onto the second rotating shaft 18.

Furthermore, a clutch means 41 is interposed between both rotating shafts 17 and 18. Specifically, the clutch means 41
As shown in the figure, a large diameter portion 17a having an outer diameter approximately equal to the outer diameter of the second rotation shaft 18 is formed on the first rotation shaft 17, and a spline 17b is formed on the large diameter portion 17a. A spline 18a is provided at the end of the large diameter portion 17a of the rotating shaft 18.
, and a clutch member 42 that removably engages with both splines 17b and 18a is provided.

The clutch member 42 is movable in the direction of the rotation axis by an operating member 43.

Therefore, the driving force for the wheels 12.12 is transmitted from the engine 1 through the variable pulley 31, the belt A3 pulley 35, the second rotating shaft 18, and the transmission mechanism (not shown).

On the other hand, the driving force of the PTO shaft 33 is transmitted from the engine 1 through the pulley 33, the belt B1 pulley 34, and the first rotating shaft 17 to a transmission system different from the transmission system for the driving force of the wheels 12.12. A driving force for driving the equipment is transmitted to a PTO shaft that is a part of the first rotating shaft 17. As a result, the pulley 33 has a constant pitch diameter, so even if the vehicle speed of the wheels 12, 12 changes due to a change in the pitch diameter of the variable pulley 31, the PTO shaft (first rotating shaft 17) remains at a constant rotation speed. It will rotate.

In addition, when the first rotating shaft 17 and the second rotating shaft 181.8 are connected, when the belt tensioner 52 is pressed and the belt tensioner 53 is released, both the rotating shafts 181.8
．． 7.18 is variable pulley 31, belt A and pulley 35
It is rotated by the engine 1 through a variable pulley mechanism consisting of a variable pulley 31, and is driven at variable speeds according to a pulley ratio set by a variable pulley 31. Further, when the belt tensioner 52 is pressed and the belt tensioner 53 is released, both rotating shafts 17 and 18 are rotated by the engine 1 through a transmission mechanism consisting of the pulley 33, belt B, and pulley 34, and are rotated at a constant rotation speed. It is also driven at a speed of −).

In this way, the clutch means 41 and the belt tensioner 52
．． 53, (1) a mode in which the first rotating shaft 17 is driven at variable speed and a mode in which the second rotating shaft 18 is driven at a constant speed; (2) both rotating shafts 1.
7.18 Mode where both are driven at constant speed, ■Both rotating shafts 17
．． 18 can also be in a variable speed drive mode.

(Effects of the Invention) Since the present invention is configured as described above, the second rotating shaft is located outside the first rotating shaft, and the driving force of the PTO shaft or the drive shaft is transmitted from the first rotating shaft without taking up space. one of them, the second
The other can be transmitted by the rotating shaft, P T Old+
can be rotated independently of the drive shaft. In addition, the clutch means and the belt tensioner can selectively operate, as necessary, ■a mode in which one of the first or second rotating shafts is driven at a variable speed and the other is driven at a constant speed, ■a mode in which both rotating shafts are driven at a constant speed; It can take three modes: constant speed drive mode, and (2) both rotating shaft variable speed drive modes.

[Brief explanation of the drawing]

1 to 8 show an embodiment of the present invention, and FIG. 1 is a skeleton diagram of a belt type continuously variable transmission. FIG. 2 is a skeleton diagram of a belt-type continuously variable transmission according to another embodiment, FIGS. 3 to 8 show the specific configuration of the embodiment shown in FIG. 2, and FIG. Cross-sectional view of main parts of the device, No. 4
Figure 5 is a side view of the variable speed drive system, Figure 5 is a side view of the PTO shaft drive system, Figures 6 and 7 are a partial sectional view and side view of the variable pulley, Figure 8 is the top half connected, It is an explanatory view of the clutch means showing a disengaged state in the lower half. FIG. 9 is a side view of a general tiller (nine walking-type mobile units). 1... Engine 2... Output shaft 3.30... Variable pulley 14... PTO shaft (output extraction shaft) 16.34.
...Pulley 17...First rotating shaft 18...Second rotating shaft 21.22...Belt tensioner 29...
...Clutch means 52, 53...Belt tensioners A, B.
...Belt is ρ1z''6 Fig. 2 Fig. 30 Fig. 5 Fig. 40 Fig. 6 Fig. 7 Fig. 52

Claims (1)

[Claims] (1) A variable speed belt is wound between the variable pulley on the drive side and the pulley on the driven side to form a variable pulley mechanism, but it is separate from the pulley on the drive side attached to the variable pulley of the variable pulley mechanism. A general belt is wound between the transmission belt and the driven pulley to constitute a transmission mechanism, and a belt tensioner is applied to each of the speed change belt and the general belt.
A cylindrical second rotating shaft is rotatably fitted outside the rotating shaft to form a double shaft structure, a clutch means is interposed between the first and second rotating shafts, and a clutch means is interposed between the first and second rotating shafts. A driven pulley of a variable pulley mechanism is attached to one of the second rotating shafts, a driven pulley of a transmission mechanism is attached to the other, and the other of the first or second rotating shafts is linked to an output output shaft. A belt-type continuously variable transmission device.