GB2172671A - Acceleration performance enhancer - Google Patents

Abstract

A transmission system, eg a vehicle transmission system has an acceleration performance enhancer between the driving system and the driven system such that the drive is transmitted via an acceleration cone 3, belt 6 and fixed cone 8 during high motor speed. The system is provided with an acceleration freewheel 5 to transmit the drive to the output gear 10 during low motor speed and initial acceleration. Freewheel 4 is incorporated for deceleration. A belt tensioner is provided between the acceleration cone 3 and fixed cone 8. Standard gearing completes the gear chain. <IMAGE>

Description

SPECIFICATION Acceleration 'performance enhancer This invention relates to an acceleration performance enhancer.

The acceleration performance of a driven system relies on the ability of its motive power to accelerate quickly whilst under load.

Within each selected gear, acceleration is obtained purely by increasing the motor speed.

The acceleration may be improved, generally speaking, with a higher performance motor.

This can result in a high cost penalty.

According to the present invention there is provided an acceleration performance enhancer comprising an acceleration cone, acceleration freewheel, deceleration freewheel, driven cone, driving freewheel, drive belt tensioner, drive belt and gearing. The acceleration cone being adapted to move along its axis of rotation.

A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 shows a diagrammatic layout of the enhancer.

Figure 2 illustrates the belt tensioner.

Figure 3 shows, in table form, the state of each freewheel and acceleration cone position during operation.

Figures 4A and 4B show, diagrammatically, the operating principle of the belt tensioner.

Referring to the drawings the enhancer comprises a driving freewheel 2, deceleration freewheel 4, acceleration cone 3, acceleration freewheel 5, fixed cone 8, belt tensioner 9, belt 6, input gear I, output gear 10 and standard gearing 7.

Output gear I transmits the drive to freewheels 2 and 5. The gearing is such that freewheel 5 is driven slightly faster than freewheel 2. Also, the input to freewheel 4 will rotate slower than the output during normal driving and acceleration conditions. The freewheel output is shown by the arrow point.

At a predetermined point in acceleration, cone 3 will start to move from position 3A to position 3B causing the drive to the fixed cone 8 to be gradually taken up by the acceleration cone 3. The belt tensioner 9 will move in conjunction with the acceleration cone and may be activated by the motor speed throttle movement or other means. As the belt tensioner moves out the tension will be maintained by the rollers 11 being forced closer together. Freewheel 4 is incorporated in the system to provide 'feedback' during motor deceleration. The acceleration cone 3 and belt tensioner will operate in the reverse to that described above during motor deceleration.

The bet tensioner may be provided with a means of adjustment for example a turnbuckle, or similar means (not shown).

1. An acceleration performance enhancer comprising freewheels, acceleration cone, fixed cone, drive belt and gearing.

2. An acceleration performance enhancer as claimed in claim 1 wherein a belt tensioner is incorporated co-operable with the acceleration cone to maintain correct tension.

3. An acceleration performance enhancer as claimed in claim 1 or claim 2, wherein a means is provided to control the movement of the acceleration cone along with the belt tensioner.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Acceleration 'performance enhancer This invention relates to an acceleration performance enhancer. The acceleration performance of a driven system relies on the ability of its motive power to accelerate quickly whilst under load. Within each selected gear, acceleration is obtained purely by increasing the motor speed. The acceleration may be improved, generally speaking, with a higher performance motor. This can result in a high cost penalty. According to the present invention there is provided an acceleration performance enhancer comprising an acceleration cone, acceleration freewheel, deceleration freewheel, driven cone, driving freewheel, drive belt tensioner, drive belt and gearing. The acceleration cone being adapted to move along its axis of rotation. A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 shows a diagrammatic layout of the enhancer. Figure 2 illustrates the belt tensioner. Figure 3 shows, in table form, the state of each freewheel and acceleration cone position during operation. Figures 4A and 4B show, diagrammatically, the operating principle of the belt tensioner. Referring to the drawings the enhancer comprises a driving freewheel 2, deceleration freewheel 4, acceleration cone 3, acceleration freewheel 5, fixed cone 8, belt tensioner 9, belt 6, input gear I, output gear 10 and standard gearing 7. Output gear I transmits the drive to freewheels 2 and 5. The gearing is such that freewheel 5 is driven slightly faster than freewheel 2. Also, the input to freewheel 4 will rotate slower than the output during normal driving and acceleration conditions. The freewheel output is shown by the arrow point. At a predetermined point in acceleration, cone 3 will start to move from position 3A to position 3B causing the drive to the fixed cone 8 to be gradually taken up by the acceleration cone 3. The belt tensioner 9 will move in conjunction with the acceleration cone and may be activated by the motor speed throttle movement or other means. As the belt tensioner moves out the tension will be maintained by the rollers 11 being forced closer together. Freewheel 4 is incorporated in the system to provide 'feedback' during motor deceleration. The acceleration cone 3 and belt tensioner will operate in the reverse to that described above during motor deceleration. The bet tensioner may be provided with a means of adjustment for example a turnbuckle, or similar means (not shown). CLAIMS

1. An acceleration performance enhancer comprising freewheels, acceleration cone, fixed cone, drive belt and gearing.

2. An acceleration performance enhancer as claimed in claim 1 wherein a belt tensioner is incorporated co-operable with the acceleration cone to maintain correct tension.

3. An acceleration performance enhancer as claimed in claim 1 or claim 2, wherein a means is provided to control the movement of the acceleration cone along with the belt tensioner.