Charge forming device with throttle valve adjuster

Patent metadata

Field	Value
Publication number	US-2016305348-A1
Application number	US-201615098866-A
Country	US
Kind code	A1
Filing date	Apr 14, 2016
Priority date	Apr 14, 2015
Publication date	Oct 20, 2016
Grant date	—

Abstract

In at least some implementations, a charge forming device includes a main body, a throttle valve and an adjuster. The main body includes a main bore through which fluid flows for delivery to an engine. The throttle valve is carried by the main body and moveable relative to the main bore to control fluid flow through the main bore. And the adjuster is moveable relative to the throttle valve and engageable with the throttle valve to adjust the range of motion of the throttle valve. In at least some implementations, the adjuster limits the range of motion of the throttle valve when the adjuster is engaged with the throttle valve.

First claim

1 . A charge forming device, comprising:
a main body including a main bore through which fluid flows for delivery to an engine; a throttle valve carried by the main body and moveable relative to the main bore to control fluid flow through the main bore; and an adjuster moveable relative to the throttle valve and engageable with the throttle valve to adjust the range of motion of the throttle valve.

2 . The device of claim 1 wherein the adjuster is moveable from a retracted position wherein the throttle valve may move between a first position and a second position, and an advanced position wherein the throttle valve may move between a third position and a second position.

3 . The device of claim 2 wherein the range of motion of the throttle valve is greater when the adjuster is in the retracted position.

4 . The device of claim 2 wherein the third position is closer to the second position than is the first position.

5 . The device of claim 2 which also comprises a fuel injector carried by the main body and through which fuel is injected into air flowing through the main bore.

6 . The device of claim 1 wherein the throttle valve includes a valve shaft and a valve lever coupled to the valve shaft for rotation with the valve shaft, and wherein the adjuster when in an advanced position engages the valve lever to reduce the range of movement of the throttle lever.

7 . The device of claim 6 wherein the throttle valve has an idle position and a wide open position and the adjuster when in the advanced position engages the throttle lever when the throttle valve rotates toward the idle position and before the throttle valve reaches the idle position so that the throttle valve cannot be rotated to the idle position when the adjuster is in the advanced position.

8 . The device of claim 7 which also includes a stop carried by the main body and engageable with the throttle valve when the throttle valve is in the first position.

9 . The device of claim 8 wherein the adjuster and the stop are separate from each other and the adjuster is movable relative to the stop.

10 . The device of claim 2 which also includes a stop carried by the main body and arranged to engage the adjuster when the adjuster is in the advanced position.

11 . The device of claim 10 wherein the stop is adjustable so that the location of the advanced position of the adjuster may be adjusted.

12 . A charge forming device, comprising:
a main body including a main bore through which fluid flows for delivery to an engine; a throttle valve carried by the main body and moveable between a first position and a second position relative to the main bore to control fluid flow through the main bore, a stop carried by the main body to engage the throttle valve and define the first position of the throttle valve; and
an adjuster moveable relative to the throttle valve and the stop and engageable with the throttle valve to adjust the range of motion of the throttle valve, the adjuster being moveable between an advanced position and a retracted position and when the adjuster is in the advanced position, the throttle valve is prevented from moving to the first position.

13 . The device of claim 12 wherein the adjuster is moveable from a retracted position wherein the throttle valve may move between a first position and a second position, and an advanced position wherein the throttle valve may move between a third position and a second position and the third position is closer to the second position than is the first position.

14 . The device of claim 12 wherein the range of motion of the throttle valve is greater when the adjuster is in the retracted position.

15 . The device of claim 12 which also comprises a fuel injector carried by the main body and through which fuel is injected into air flowing through the main bore.

16 . The device of claim 12 wherein the throttle valve includes a valve shaft and a valve lever coupled to the valve shaft for rotation with the valve shaft, and wherein the adjuster when in an advanced position engages the valve lever to reduce the range of movement of the throttle lever.

17 . The device of claim 16 wherein the throttle valve has an idle position and a wide open position and the adjuster when in the advanced position engages the throttle lever when the throttle valve rotates toward the idle position and before the throttle valve reaches the idle position so that the throttle valve cannot be rotated to the idle position when the adjuster is in the advanced position.

18 . The device of claim 12 which also includes a stop carried by the main body and arranged to engage the adjuster when the adjuster is in the advanced position.

19 . The device of claim 18 wherein the stop is adjustable so that the location of the advanced position of the adjuster may be adjusted.

20 . The device of claim 12 wherein when the adjuster is in the advanced position the throttle valve may move between a third position and the second position, and the third position is selected as a function of the engine with which the charge forming device is used to maintain the engine speed below a threshold level for actuation of a clutch associated with the engine and when the throttle valve is in the second position the engine speed will be greater than the threshold level.

Assignees

• Walbro Llc

Inventors

• Gangler Bryan K
• Roche Bradley J
• Suzuki Dairoku
• Speirs David L
• Zbytowski Eric G

Classifications

• F02D2200/0404

  Throttle position · CPC title

• F02D2009/0296

  Throttle control device with stops for limiting throttle opening or closing beyond a certain position during certain periods of operation · CPC title

• F02D9/105

  having a throttle position sensor (detection of actuation F02D11/106) · CPC title

• F02D2400/06

  Small engines with electronic control, e.g. for hand held tools · CPC title

• F02D11/06 Primary

  characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance · CPC title