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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Hydraulic Steering Damper
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<blockquote data-quote="macvette" data-source="post: 99569" data-attributes="member: 262"><p>I decided to analyse the different set ups from basic principles. That is,we are trying convert rotational movement into linear movement. Sound familiar? Think crankshaft, conrod and piston.</p><p>The displacement of the damper rod is a function of the sine of the angle by which the steering is rotated and the distance the damper pivot is behind the centre of rotation of the steering regardless of which version is considered. This distance is limited by the useable damper stoke.</p><p>With the damper body pivoted on its centreline and on the centreline of the centre of rotation of the steering at mid stroke, this is a straight forward function of the sine of the angle of rotation of the steering from straight ahead.</p><p>This is not the case when the offset damper mounting bracket is used. At first sight this is not obvious. The displacement is still a sine function of steering angle but the offset bracket introduces a second lever between the driving bracket and the centreline of the damper reducing damper stroke for a given steering rotation.This is coincidentally compensated by the damper body ending up further away from centre of rotation of the steering. This equally true of both Norman's and Vic's set up using the offset damper pivot. </p><p>To get back to basics I dug out my fifty year old Theory of Machines text book from my university days and derived the algebraic relationship from there.</p><p>My conclusion is that centre line mounting of the damper body is the most efficient way to mount it regardless of which of the different approaches used. </p><p>If you want to mount a hydraulic damper on a C or D, use the old damper stop position with a centreline body pivot. Measure the distance from the centre of rotation of the steering to the centre of the damper. This is the distance your actuating lever needs to be behind the steering centreline. Mount the damper with its stroke and body on the bike centre line measure the distance to the centre of the rose joint on the damper rod. This is how long the actuating arm needs to be.</p><p>Regards Mac</p></blockquote><p></p>
[QUOTE="macvette, post: 99569, member: 262"] I decided to analyse the different set ups from basic principles. That is,we are trying convert rotational movement into linear movement. Sound familiar? Think crankshaft, conrod and piston. The displacement of the damper rod is a function of the sine of the angle by which the steering is rotated and the distance the damper pivot is behind the centre of rotation of the steering regardless of which version is considered. This distance is limited by the useable damper stoke. With the damper body pivoted on its centreline and on the centreline of the centre of rotation of the steering at mid stroke, this is a straight forward function of the sine of the angle of rotation of the steering from straight ahead. This is not the case when the offset damper mounting bracket is used. At first sight this is not obvious. The displacement is still a sine function of steering angle but the offset bracket introduces a second lever between the driving bracket and the centreline of the damper reducing damper stroke for a given steering rotation.This is coincidentally compensated by the damper body ending up further away from centre of rotation of the steering. This equally true of both Norman's and Vic's set up using the offset damper pivot. To get back to basics I dug out my fifty year old Theory of Machines text book from my university days and derived the algebraic relationship from there. My conclusion is that centre line mounting of the damper body is the most efficient way to mount it regardless of which of the different approaches used. If you want to mount a hydraulic damper on a C or D, use the old damper stop position with a centreline body pivot. Measure the distance from the centre of rotation of the steering to the centre of the damper. This is the distance your actuating lever needs to be behind the steering centreline. Mount the damper with its stroke and body on the bike centre line measure the distance to the centre of the rose joint on the damper rod. This is how long the actuating arm needs to be. Regards Mac [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Hydraulic Steering Damper
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