JPH04265422A - Driving device for supercharger - Google Patents

Abstract

PURPOSE:To drive a supercharger at high speed and improve engine output by controlling a pulley diameter so that the speed of a driven side pulley is increased with a cam mechanism as an adjusting mechanism at increase of load torque applied on a driving device. CONSTITUTION:A cam mechanism 37 is constituted out of a cam groove 39 provided on a driven shaft 25 and a cam pin 43 studded on the boss part 41 of a movable pulley 29, and the cam groove 39 is formed so as to be inclined against the axis of the driven shaft 25. Hereby, at applying the large torque shown with the arrow line T on the movable pulley 29, the cam pin 43 is sufficiently pushed left to move the movable pulley 29 apart from a fixed pulley 27. Meanwhile, when the torque applied on the movable pulley 29 is small, the pushing force due to the cam groove 39 is small, and hence the cam pin 43 is sufficiently parted from the left end of the cam groove 39. Consequently, when a throttle is fully opened and load applied on a supercharger is large, the supercharger is controlled to be at high speed with the cam mechanism and engine output is improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supercharger drive device.

0002

2. Description of the Related Art A drive device 102 conventionally used for a supercharger 101 has a speed increasing mechanism 1 as shown in FIG.
The driven pulley 105 connected to the supercharger 101 via the belt 103 and the driving pulley 109 that drives the driven pulley 105 via the belt 107 are both variable diameter pulleys whose pulley diameters are variable. It is assumed that it has been formed.

That is, the driven pulley 105 is connected to the driven shaft 1.
11, and a cone-shaped movable pulley 115 that is movable in the axial direction relative to the driven shaft 111, between the movable pulley 115 and the flange 117 fixed to the driven shaft 111. weight 1
19 is interposed. The movable pulley 115 is moved by the centrifugal force of this weight 119 according to the rotational speed of the driven shaft 111.
is brought closer to the fixed pulley 113, thereby narrowing the pulley width of the driven pulley 105 and increasing the pulley diameter, thereby reducing the rotation speed of the driven shaft 111 and controlling the rotation of the supercharger 101. It has a structure that allows

The drive side pulley 109 also includes a cone-shaped fixed pulley 123 fixed to the drive shaft 121 and a cone-shaped fixed pulley 123 fixed to the drive shaft 121.
The movable pulley 125 is composed of a cone-shaped movable pulley 125 that is movable in the axial direction relative to the drive shaft 121, and the movable pulley 125 is always pushed toward the fixed pulley 123 by a balance spring 129 in a spring case 127 fixed to the drive shaft 121. When the axial position of the belt 107 is determined by the regulating operation of the movable pulley 115 of the driven pulley 105, the action of the balance spring 129 causes the driving pulley 109 to move the belt 107 in the axial and diametrical directions. The winding position is determined, and the diameter of the pulley formed by the movable pulley 125 and the fixed pulley 123 is also maintained at a predetermined value.

By the way, when the drive pulley 109 is driven by the engine 131 using the transmission system shown in FIG. 7, when the load is large, even if the throttle is fully opened, the drive device 102 having the above-mentioned structure will not work properly due to its characteristics. There is a problem in that the rotational speeds of the driven shaft 111 and the supercharger 101 decrease, and high output commensurate with the high load cannot be obtained. That is, when the rotation speed of the drive shaft 121 and the driven shaft 111 increases due to opening of the throttle, the centrifugal force acting on the weight 119 also increases, the diameter of the driven pulley 105 increases, and the rotation speed of the driven shaft 111 increases. The function of increasing the rotational speed by lowering the throttle and opening the throttle is negated, and no increase in output by the supercharger 101 can be expected, and high output corresponding to high load cannot be obtained.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to configure a supercharger drive device so that the rotational speed of the supercharger increases and high output is obtained when the load is high.

[0007]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a driving pulley driven by an engine, and a driven pulley driving a supercharger via a belt wound around the driving pulley. In a supercharger drive device in which the drive pulley is formed into a variable diameter pulley that reduces the diameter of the drive pulley or increases the diameter of the driven pulley in response to an increase in the rotational speed of the driven pulley, the In order to increase the speed of the driven pulley when the load torque increases, an adjustment mechanism is provided for controlling at least the pulley diameter of the driven pulley.

[0008]

[Effect] When the load torque acting on the drive device increases,
A cam mechanism serving as an adjustment mechanism controls the pulley diameter of the driven pulley so that the speed of the driven pulley is increased.

[0009] As a result, the supercharger is driven at high speed, the output of the engine is improved, and it becomes possible to cope with an increase in load torque.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a supercharger drive device to which an embodiment of the present invention is applied.

The drive device 1 is composed of a driven pulley 7 connected to the supercharger 3 via a speed increasing mechanism 5, and a drive pulley 11 that drives the driven pulley 7 via a belt 9. The driven pulley 7 and the driving pulley 11 are both variable diameter pulleys.

That is, the drive pulley 11 is connected to the drive shaft 13.
It is composed of a cone-shaped fixed pulley 15 fixed to the fixed pulley 15, and a cone-shaped movable pulley 17 disposed opposite to the fixed pulley 15 and movable in the axial direction of the drive shaft 13,
The movable pulley 17 is biased toward the fixed pulley 15 by balance springs 21 and 23 housed in a spring case 19 fixed to the drive shaft 13.

The driven pulley 7 includes a cone-shaped fixed pulley 27 fixed to the driven shaft 25 and a fixed pulley 27.
a cone-shaped movable pulley 29 that is disposed opposite to each other and movable in the axial direction of the driven shaft 25; and a dish-shaped flange body 31 that is disposed opposite to the dish-shaped back of the movable pulley 29 and fixed to the driven shaft 25. , the back of the movable pulley 29, and a spherical weight 33 interposed between the flange body 31, and the movable pulley 29 is biased by a balance spring 35 in a direction toward the fixed pulley 27.

When the rotational speed of the driven shaft 25 increases, the weight 3
The centrifugal force caused by 3 increases and moves the movable pulley 29 away from the flange body 31 and closer to the fixed pulley 27.

In the embodiment of the present invention, a cam mechanism 37 is provided as an adjustment means that operates to move the movable pulley 29 away from the fixed pulley 27 when the load torque acting on the drive device 1 increases. has been established.

The illustrated cam mechanism 37 consists of a cam groove 39 provided on the driven shaft 25 and a cam pin 43 that is inserted into the boss portion 41 of the movable pulley 29 and engages with the cam groove 39. As shown in FIGS. 2 and 3, which are views taken along the -A line, the cam groove 39 is formed to be inclined with respect to the axis of the driven shaft 25.

As a result, a large torque shown by the arrow T in FIG. 3 acts on the movable pulley 29, and the cam pin 43 is sufficiently pushed to the left in the figure to move the movable pulley 29 away from the fixed pulley 27. I'm trying to make it work.

On the other hand, when the torque acting on the movable pulley 29 is small, the pushing force exerted by the cam groove 39 is also small, so that the cam pin 43 is sufficiently separated from the left end of the cam groove 39 as shown in FIG.

Due to the engagement between the cam groove 39 and the cam pin 43, the movable pulley 29 moves according to the magnitude of the load torque, so that the pulley diameter of the driven pulley 7 is adjusted from a large diameter to a small diameter. .

In this embodiment, a second cam mechanism 45 is provided which can also adjust the pulley diameter of the driving pulley 11 according to the magnitude of the load torque, and cooperates with the cam mechanism 37 of the driven pulley 7. This allows high output to be obtained under high loads.

That is, this cam mechanism 45 consists of a cam groove 47 provided on the drive shaft 13 and a cam pin 51 that is inserted into the boss portion 49 of the movable pulley 17 of the drive side pulley 11 and engages with the cam groove 47. As shown in FIGS. 4 and 5, which are views taken along line B--B in FIG. 1, the cam groove 47 is formed to be inclined with respect to the axis of the drive shaft 13.

As a result, a large torque shown by the arrow T in FIG. 5 acts on the movable pulley 17, causing the cam pin 51 to
is sufficiently pushed to the left in the figure to bring the movable pulley 17 closer to the fixed pulley 15.

When the torque acting on the movable pulley 17 is small, the pushing force exerted by the cam groove 47 is also small, so the cam pin 51 is sufficiently far away from the left end of the cam groove 47 as shown in FIG.

Due to the engagement between the cam groove 47 and the cam pin 51, the movable pulley 17 moves according to the magnitude of the load torque, thereby adjusting the pulley diameter of the driving pulley 11 from a small diameter to a large diameter. .

In the embodiment of the present invention, the driven pulley 7 and the driving pulley 11 are controlled by the respective cam mechanisms 37 and 45 as described above.

Therefore, when the throttle opening of the engine is small and the load acting on the drive device 1 is small, the torque acting on the movable pulleys 29, 17 is also small, so the axial movement force by the respective cam mechanisms 37, 45 is The rotational speed of the supercharger 3 becomes a low value as shown in the characteristic curve a in FIG. 6, and the output of the engine becomes a low value.

On the other hand, when the engine throttle is sufficiently opened to increase the load applied to the drive device 1, the torque acting on the movable pulleys 29, 17 also increases, and the axial movement force by the cam mechanisms 37, 45 also increases. , the pulley diameter of the driven pulley 7 becomes small and the pulley diameter of the driving pulley 11 becomes large, the rotational speed of the supercharger 3 changes as shown by characteristic curve b, and the engine has a high output.

As described above, by providing the cam mechanisms 37 and 45 that control the pulley diameters of the driven pulley 7 and the drive pulley 11 in the drive device 1 of the supercharger 3, the supercharger 3 At low speeds, the engine produces low output, and at high loads, high output is obtained at high speeds;
The engine can be controlled to achieve low fuel consumption.

In addition to the characteristic curves illustrated in FIG. 6, various desired characteristics not shown can be obtained by changing the inclination and shape of the cam grooves 39, 47 of the cam mechanisms 37, 45. can.

[0031]

[Effect of the invention] Since this invention is configured as described above,
When the load acting on the supercharger is small, the adjustment mechanism does not correct the speed change characteristics, the supercharger rotational speed decreases, the engine is controlled to low output, and the throttle is opened sufficiently to affect the supercharger. As the load increases, the cam mechanism controls the supercharger to rotate at high speed, increasing the engine's output.

[0032] As a result, high output can be obtained under high loads, resulting in a control system with low fuel consumption.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a drive device.

FIG. 2 is an explanatory diagram of the operation taken along the line A-A in FIG. 1;

FIG. 3 is an explanatory diagram of the operation taken along the line A-A in FIG. 1;

FIG. 4 is an explanatory diagram of the operation taken along line BB in FIG. 1;

FIG. 5 is an explanatory diagram of the operation taken along the line BB in FIG. 1;

FIG. 6 is a characteristic diagram of a supercharger in an embodiment of the present invention.

FIG. 7 is an explanatory diagram of a conventional drive device.

[Explanation of symbols]

1 Drive device 3. Supercharger 7 Driven pulley 9 Belt 11 Drive side pulley 37 Cam mechanism

Claims (1)

[Claims] Claim 1: A drive-side pulley driven by the engine and a driven-side pulley that drives a supercharger via a belt wrapped around the drive-side pulley are driven in response to an increase in the rotational speed of the driven-side pulley. In a supercharger drive device that is formed with a variable diameter pulley in which the diameter of the side pulley is reduced or the diameter of the driven pulley is increased, when the load torque acting on the drive device increases, the driven pulley speeds up. A supercharger drive device characterized by comprising an adjustment mechanism for controlling at least a pulley diameter of the driven pulley.