Electronically controlled valve for a shock absorber

Pending Publication Date: 2020-03-26
OHLINS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020]The spool may be connected to the actuator by means of a shaft, and wherein the pressure compensation chamber is provided around the shaft. Providing the pressure compensation chamber around the shaft enables use of a simple and robust piston holder in one piece with a simple to machine inner channel/bore, whereas any extra balancing forces needed can be allocated to the portion surrounding the shaft, which is readily available for machining from the actuator-side of the housing anyways. This design of the valve is thus simple and robust.
[0021]The spool and the shaft may be cylindrical and the diameter of the shaft smaller than the diameter of the spool. The space around the shaft exposes surfaces of the spool suitable for pressure-compensation within the confines of the central bore of the piston holder. Thereby fewer machining steps are required for manufacturing of the valve, whilst the overall size and weight of the spool, as well as the valve, may be kept small.
[0022]The spool and/or the shaft may be configured such that a fluid pressure acting in the pressure compensation chamber forces the spool away from the open position towards the closed position. The pressure from the fluid in the pressure compensation chamber acts on surfaces of the spool directed so as to have a force component acting for pu

Problems solved by technology

A drawback of the valve is that the actuator is slow wh

Method used

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Examples

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Example

[0040]A shock absorber 2a comprising a valve according to a first embodiment of the invention is shown in FIGS. 1-4 and 6. A valve according to a second embodiment of the invention is shown in FIGS. 5 and 7.

[0041]The shock absorber 2a of FIGS. 1-4 is typically used for damping the movement of a front wheel of a motorcycle, although other uses are possible. The damper uses a known twin tube design to route damping fluid during compression and rebound stroke of the shock absorber past one or more valves controlling fluid flow in the damper. The inventive valve is shown in more detail in FIGS. 4 and 6.

[0042]The valve 1 comprises a housing 3 inserted into a first chamber 4 of the shock absorber 2.

[0043]The first chamber may in some embodiment correspond to the working chamber of the shock absorber. In other embodiments, the first chamber may correspond to an auxiliary chamber in fluid connection with the working chamber of the shock absorber, such as a space formed in an upper portion of t

Example

[0067]A valve according to a third embodiment of the invention is shown in FIGS. 9-11 with an alternative embodiment in FIG. 12 comprising a pressure compensation system with an auxiliary fluid channel 20 connecting a pressure compensation chamber 19 to the secondary fluid channel 11 through the spool 12. The valve 1c according to the third embodiment of the invention functions similar to the valve of the first two embodiments 1a, 1b described above, but is adapted for damper fluid flows in the opposite directions. As such, the secondary fluid flow is restricted at the opposite side of the piston as compared to the other two embodiments. The spool restricts the secondary fluid flow at the end portion of the spool and retracts the end portion to unrestrict the secondary fluid flow which then flows directly through the secondary fluid channel of the piston holder without being routed through the spool. As shown in FIG. 11, the restricting end of the spool is provided with a conical porti

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Abstract

An electrically controlled valve (1) for a shock absorber (2). The valve comprises a piston (7) providing a primary fluid channel (10) for damping fluid. A piston holder (5) is provided with an internal secondary fluid channel (11) for damping fluid. Fluid flow (23) through the secondary fluid channel is controlled by a spool (12) movable within the piston holder (5) by means of an electrically controlled actuator (13). Fluid flow (23) through the secondary fluid channel (11) is controlled by restriction at the inlet of the secondary fluid channel (11), said inlet comprising one or more radial holes through the piston holder.

Description

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Claims

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Application Information

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Owner OHLINS
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