- RAMP-CV1 Constant Velocity ramp
with a "text book" ramp height of
.0040000 inches with a constant velocity of
.00040000 inches per degree.
- RAMP-CV2 Constant Velocity ramp
with a "text book" ramp height of
.0080000 inches with a constant velocity of
.00040000 inches per degree.
- RAMP-CP1 Constant Acceleration
ramp with a "CPAC" type ramp. (CPAC = Constant
Positive Acceleration).
This example has a constant acceleration of
.00001000 inches per degree squared.
-
-
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RAMP-CP2 Constant Acceleration ramp with a "CPAC" type ramp.
(CPAC =
Constant Positive Acceleration).
This example has a short section of constant acceleration with a value of
.00004860"/D2.
(inches per degree squared).
-
RAMP-AC1
"ACCELERATED-RAMP"®. This type of ramp has
a "REVERSAL" in the acceleration before reaching peak positive acceleration.
This example has a "RAMP HEIGHT" data (as described
by Harvey Crane's method) of:
.00351851"
@ .00049606"/degree
@ .00002496"/degree 2
@ .00000000"/degree 3
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RAMP-AC2 "ACCELERATED-RAMP"®. This type of
ramp is a variation of the above "ACCELERATED-RAMP"®.
This example has a
"RAMP HEIGHT" data (as described by Harvey Crane's method) of:
.00849963"
@ .00144598"/degree
@ .00010680"/degree 2
@ .00000021"/degree 3
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RAMP-AC3 "ACCELERATED-RAMP"®. This type of
ramp has a
"REVERSAL" in the acceleration before reaching peak positive acceleration.
This example has a "RAMP HEIGHT" data (as described by Harvey Crane's
method) of:
.00763133"
@ .00132272"/degree
@ .00011880"/degree 2
@ .00000000"/degree 3
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RAMP-AC4 "ACCELERATED-RAMP"®. This type of
ramp has a "REVERSAL" in the acceleration before reaching peak positive
acceleration. This example has a "RAMP HEIGHT" data (as described by Harvey
Crane's method) of:
.00698067"
@ .00144108"/degree
@ .00017951"/degree 2
@ .00000076"/degree 3
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RAMP-CJ1 CONSTANT JERK type ramp. This type of ramp has constant jerk values
of .00000200" per degree cubed from the base
circle juncture to the area of increasing jerk.
This example has a "RAMP HEIGHT" data (as described by
Harvey Crane's method) of:
.00291878"
@ .00042511"/degree
@ .00004128"/degree 2
@ .00000200"/degree 3
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RAMP-NP1 "NO-PULSE"® type ramp. This type
of ramp has none of the "NORMAL" characteristics of any of the above
described ramps! Some people will say "This design doesn't have a RAMP"!
That is because they have no practical experience of using this type of ramp
(ON THE OPENING SIDE ONLY) I have been using this style of a ramp on the
opening side of designs since 1973! This example has no normal "RAMP HEIGHT"
data (as described by Harvey Crane's method).
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RAMP-VD1 "DWELL AT MAXIMUM VELOCITY" This type of ramp is for a normal FLAT
TAPPET. It has the velocity limited to permit HIGHER THAN NORMAL LIFT in
relation to the duration.
This is NOT NEW!
The technology was used to design the 1932 Ford flathead V8 cam profile.
This engine used only a one inch diameter tappet and Ford engines before
1932 used much larger diameter tappets. The one inch diameter tappet was
required to reduce the length of the camshaft and engine.
The design also uses a "NO-PULSE"® type
ramp. This example has no normal "RAMP HEIGHT" data (as described by Harvey
Crane's method).
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RAMP-VD2 "NEAR DWELL AT MAXIMUM VELOCITY" This type of ramp is also for a
normal FLAT TAPPET. The design also uses a "CPAC" type ramp. (CPAC =
Constant Positive Acceleration).
This example has a short section of constant acceleration with a value of
.00008000"/D2.
(inches per degree squared).
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to view the PLOTVGA7 graph
NO-PULSE ® |
| This was
registered with the United States Patent and Trademark Office on
September 20, 2005. The Reg. No. is 2,998,804 |
ACCELERATED-RAMPS ® |
| This was
registered with the United States Patent and Trademark Office and
accepted on June 20, 2006. The Reg. No. is 3,107,399 |
The graphs that appear above
are copyright and may not be used without written permission of harvey
CRANE, Inc.
|
