CN86201694U - Spring type overriding mechanism - Google Patents
Spring type overriding mechanism Download PDFInfo
- Publication number
- CN86201694U CN86201694U CN 86201694 CN86201694U CN86201694U CN 86201694 U CN86201694 U CN 86201694U CN 86201694 CN86201694 CN 86201694 CN 86201694 U CN86201694 U CN 86201694U CN 86201694 U CN86201694 U CN 86201694U
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- China
- Prior art keywords
- spring
- way element
- steel wire
- element according
- axle
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Abstract
The utility model discloses a spring type overriding mechanism used for two components which can rotate oppositely, in particular for preventing the overriding damage due to a starter armature dragged by an engine. The spring of the overriding mechanism is wound through steel wires with the changing sectional area or flexible ropes. Because the integral rigidity of the spring is small; the number of turns is a lot; the pretightening force required on the combination surface is very small, the overriding resistance can be greatly decreased.
Description
The utility model is a kind of two relatively turnable parts that are used for, the spring one-way element that exceeds the speed limit especially for preventing starter armature dragged by motor and damage.
The basic pattern of known spring one-way element is that " mechanical design handbook " (volume in Chemical Industry Press's second edition) gone up record for the 190th page.Here be with a garden post spring on axle, the internal diameter of spring is slightly smaller than the external diameter of axle, makes on the junction plane slightly pretightening force.One end of spring is fixed on the wheel, and the other end is a free end.When wheel (or axle) was pressed the direction rotation of spring Coil-up, the internal diameter of spring dwindled, and impacting force and frictional force on the junction plane are increasing, therefore drove axle (or wheel) rotation; When the rotating speed of axle (or wheel) during greater than the rotating speed of wheel (or axle), spring on driving wheel an end be subjected to force direction with aforementioned opposite, at this moment the internal diameter of spring increases, impacting force and frictional force on the junction plane reduce, when the friction torque that produces on the junction plane during less than the friction torque in wheel (or axle) self system, axle (or wheel) can do to surmount rotation.Surmounting under the state, the frictional force of junction plane is approximately equal to the maximum static friction force of spring to the pretightening force generation of axle.The minimum limit value of pretightening force is by the decision of the rigidity of the number of active coils of spring and steel wire.Number of turns rigidity many more and steel wire is more little, and the minimum pretightening force that needs on the junction plane is also just more little.Specifically mechanically: the number of turns of spring be subjected to spring length restriction can not around a lot; The section of steel wire of spring is long-pending must to guarantee that steel wire can bear the maximum pull that may occur, and sectional area can not be very little, so the rigidity of steel wire is bigger.These factors make on the junction plane must bigger pretightening force, and one-way element could proper functioning.This just causes known spring one-way element to exist the bigger resistance square (promptly surmounting the friction torque on the junction plane under the state) that surmounts.Particularly in the one-way element that transmits big torque, surmount the resistance square often greatly to the degree that can not allow, so that in design, have to select for use the one-way element of other type.
The purpose of this utility model is that a kind of improved spring one-way element will be provided.Under the condition of transmitting the torque equate with known one-way element, surmounting torque and can reducing significantly of it makes the one-way element of this technical order near other type.
The novel spring type one-way element is equipped with spring on axle, an end of spring is fixed on the wheel, and the other end is a free end, and the internal diameter of spring is slightly less than the external diameter of axle.Above-mentioned purpose is achieved in that spring is with the long-pending steel wire coiled of variable cross section, or the flexible strand coiled that is twisted into strands of metal wire or nonmetal wire.The free end of flexible strand spring is fixed on the steel traveler on the axle, and the internal diameter of steel traveler is slightly less than the external diameter of axle.It is necessary doing like this, and little with the spring overall stiffness of the long-pending steel wire coiled of variable cross section, the number of coils is many, can reduce pretightening force, reduces to surmount the resistance square; The spring made from flexible strand can reduce the rigidity of " steel wire " significantly, and therefore also can having, improvement surmounts performance.
The spring one-way element is that structure is the simplest in the existing one-way element, a kind of one-way element that manufacture cost is minimum.It is simple that it has production technology, do not need special device, uses easy to maintenancely, do not have advantages such as noise during work.The utility model has improved and has surmounted performance, for further applying the spring one-way element, particularly is widely used in the condition of having created on the starter motor.
The one-way element that the utility model provides also can be used as arrestment mechanism and unidirectional locking mechanism.When wheel (or axle) fixedly the time, brake when then the coiling direction of the sense of rotation of axle (or wheel) and spring is identical; Can freely rotate when the coiling direction of sense of rotation and spring is opposite.
The coiling direction of spring is such regulation: one-way element enter surmount state before, if the wheel driving shaft is passive, then observe spring and be fixed on a end on the wheel,, claim that then this direction is the coiling direction of spring if the sense of rotation of wheel makes the number of turns of spring that the trend of increase be arranged; If the axle driving wheel is passive, then observe the free end of spring, if driving the free end of spring, axle rotates, make the number of turns of spring that the trend of increase be arranged, claim that then the sense of rotation of axle is the coiling direction of spring.
The concrete structure of model utility is provided by following examples and Figure of description.
The spring one-way element of Fig. 1～7 is made up of back-up ring (1), bearing (2), wheel (3), spring (4) and axle (5).One end of spring (4) is fixed on the wheel (3), and the other end is a free end.The internal diameter of spring is slightly less than the external diameter of axle.The A point is that Spring Steel Wire bears a bit of pulling force maximum among the figure, and the B point is a free end.Each embodiment's characteristics are as follows:
The sectional area of the Spring Steel Wire among Fig. 1 is by the index law continually varying.The long-pending available following formula calculating of the section of steel wire of any arbitrarily in from A to B:
S＝S
max·e
-2πμon
In the formula: S
Max---the section of steel wire that the A point needs is long-pending.
μ
0---the friction factor of steel wire and axle.
N---any 1 number of coils that arrives between the A point.
Spring Steel Wire sectional area among Fig. 2 is by linear square law continually varying, from A to B in arbitrarily any long-pending available following formula of section of steel wire calculate:
In the formula: N---the spring number of total coils from A to B.
Wide and the high size in the Spring Steel Wire cross section among Fig. 3 diminishes from A to B continuously.
Wide and the high definition in Spring Steel Wire cross section is: between from A to B arbitrarily on the steel wire of a bit, steel wire spring shaft to overall dimensions be called the wide of this section of steel wire, steel wire is called the height of this section of steel wire in spring overall dimensions radially.
When the B linearity diminished, the long-pending Changing Pattern of section of steel wire was similar to index law to the height and width of garden steel wire from A.
Spring Steel Wire cross section among Fig. 4 high constant is that wide size diminishes from A to B continuously.
Spring Steel Wire cross section among Fig. 5 wide constant is that high size diminishes from A to B continuously.
The long-pending steel wire of variable cross section among Fig. 6 is tapered the obtaining of outer garden surface Machining common spring.
Spring Steel Wire sectional area among Fig. 7 diminishes to the B point step by step from the A point.Spring can be with the steel wire coiled more than two sections or two sections, and the joint is with weldering, riveting, strand or add method such as intermediary's part and couple together.Also can amass the steel wire what different cross-sectional steel wire is processed into, coiled spring again to the whole piece uniform section with cutting method earlier.The sectional area of every section steel wire can calculate with following formula:
In the formula: S
Ab, S
Bc, S
Cd---be respectively ab section, bc section, Cd
The sectional area of section Spring Steel Wire.
N
Ab, N
Bc---be respectively the spring of ab section, bc section
The number of turns.
Fig. 8 is the spring one-way element with the wire rope spring.This mechanism is made up of back-up ring (1), bearing (2), wheel (3), spring (4), axle (5) and steel traveler (6).Spring (4) is used the wire rope coiled.The free end of spring is fixed on the steel traveler (6), and the internal diameter of steel traveler (6) is slightly less than the external diameter of axle.The further improvement of said structure is to add encapsulation (7), and this all surmounting under the state, wire rope can fitly be arranged in the inwall of cover, can be not loose.The external diameter that the internal diameter of cover (7) equals axle adds 2～3 times wire rope maximum outside diameter.
Another improvement is to add locating slot (8) on axle, and steel traveler (6) is installed in the locating slot (8), and steel traveler (6) axially can not move like this, prevents the wire rope entanglement that may cause thus.
Claims (13)
1, is used for two relatively turnable parts, the spring one-way element that exceeds the speed limit especially for preventing starter armature dragged by motor and damage.This mechanism is made up of back-up ring [1], bearing [2] wheel [3], spring [4], axle [5], and an end of spring [4] is fixed on the wheel [3], and the other end is a free end, and the internal diameter of spring [4] is slightly less than the external diameter of axle.It is characterized in that: spring [4] is with the long-pending steel wire coiled of variable cross section.
2, be used for two relatively turnable parts, the spring one-way element that exceeds the speed limit especially for preventing starter armature dragged by motor and damage.This mechanism is made up of back-up ring (1), bearing (2) wheel (3), spring (4), axle (5) and steel traveler (6), one end of spring (4) is fixed on the wheel (3), the other end is a free end, it is characterized in that: spring (4) is the flexible strand coiled that is twisted into strands of metal wire or nonmetal wire, the free end of spring (4) is fixed on the steel traveler (6), and the internal diameter of steel traveler (6) is slightly less than the external diameter of axle.
3, spring one-way element according to claim 1 is characterized in that section of steel wire is long-pending to change by index law.
4, spring one-way element according to claim 1 is characterized in that section of steel wire is long-pending by linear square law variation.
5, spring one-way element according to claim 1 is characterized in that the wide and high size of section of steel wire diminishes continuously from A to B.
6, spring one-way element according to claim 1 is characterized in that the high constant of section of steel wire, and wide size diminishes from A to B continuously.
7, spring one-way element according to claim 1 is characterized in that the wide constant of section of steel wire, and high size diminishes from A to B continuously.
8, spring one-way element according to claim 1 is characterized in that section of steel wire is long-pending to diminish step by step from A to B.
9, one-way element according to claim 1 is characterized in that the outer garden surface Machining of spring is tapered.
10, one-way element according to claim 2 is characterized in that spring (4) is to use the wire rope coiled.
11, one-way element according to claim 2 is characterized in that having installed additional cover (7).The external diameter that the internal diameter of cover (7) equals axle adds 2～3 times wire rope maximum outside diameter.
12, one-way element according to claim 2 is characterized in that having on the axle locating slot (8).
13,, it is characterized in that this one-way element can be used for arrestment mechanism or unidirectional locking mechanism according to claim 1 and 2 described one-way elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86201694 CN86201694U (en) | 1986-03-24 | 1986-03-24 | Spring type overriding mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86201694 CN86201694U (en) | 1986-03-24 | 1986-03-24 | Spring type overriding mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86201694U true CN86201694U (en) | 1987-02-11 |
Family
ID=4805397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86201694 Ceased CN86201694U (en) | 1986-03-24 | 1986-03-24 | Spring type overriding mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86201694U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105387176A (en) * | 2015-12-25 | 2016-03-09 | 宁波市洋通汽车配件有限公司 | One-way buffer belt wheel |
-
1986
- 1986-03-24 CN CN 86201694 patent/CN86201694U/en not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105387176A (en) * | 2015-12-25 | 2016-03-09 | 宁波市洋通汽车配件有限公司 | One-way buffer belt wheel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CE01 | Termination of patent right |