Throttle valve

Patent metadata

Field	Value
Publication number	US-10024457-B2
Application number	US-201415119001-A
Country	US
Kind code	B2
Filing date	Aug 28, 2014
Priority date	Mar 31, 2014
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A throttle valve 10 continuously increases/decreases the flow rate of air flowing through a communication hole 17 through which a first port 11 and a second port 12 are communicated with each other, by using a throttle valve element 22. A valve seat member 15 having the communication hole 17 is attached to a housing 13. An electric motor 25 is attached to a motor housing hole 24 formed in the housing 13. The throttle valve element 22 is driven in an axial direction by a motor shaft 28 of the electric motor 25. A gap between the motor housing hole 24 and the electric motor 25 is sealed by a fixed sealing member 41 having a large diameter, and the motor shaft 28 is sealed by a rotary sealing member 42 having a small diameter, whereby the throttle valve element can be driven by the electric motor having a small output.

First claim

The invention claimed is:

1. A throttle valve comprising a communication hole through which a first port and a second port are communicated with each other, and adapted to continuously vary a flow rate of air flowing through the communication hole by using a throttle valve element, the throttle valve further comprising:
a housing having a motor housing hole;
an electric motor provided with a motor shaft for driving the throttle valve element in its axial direction, and attached to the motor housing hole;
a fixed sealing member having a large diameter for use in sealing a gap between the motor housing hole and the electric motor; and
a rotary sealing member having a small diameter for use in sealing the motor shaft,
wherein the rotary sealing member is in sliding contact with the fixed sealing member when the motor shaft is driving the throttle valve element.

2. The throttle valve according to claim 1 , further comprising:
a compression coil spring for applying a spring force in the axial direction to the throttle valve element.

3. The throttle valve according to claim 1 , wherein
the fixed sealing member is in contact with an inner peripheral face of the housing, and
the rotary sealing member is separated from the inner peripheral face of the housing, and in contact with the fixed sealing member and the motor shaft.

4. A throttle valve comprising: a communication hole through which a first port and a second port are communicated with each other, and adapted to continuously vary a flow rate of air flowing through the communication hole by using a throttle valve element, the throttle valve further comprising:
a housing to which a valve seat member having the communication hole is attached and in which a valve element guide hole for guiding the throttle valve element so as to freely move in an axial direction is formed;
an electric motor having a motor shaft for driving the throttle valve element in the axial direction, which is attached to a motor housing hole formed in the housing so as to communicate with the valve element guide hole;
a fixed sealing member having a large diameter for use in sealing a gap between the motor housing hole and the electric motor; and
a rotary sealing member having a small diameter for use in sealing the motor shaft,
wherein the rotary sealing member is in sliding contact with the fixed sealing member when the motor shaft is driving the throttle valve element.

5. The throttle valve according to claim 4 , further comprising:
a rotation driving shaft fixed to the motor shaft,
wherein the throttle valve element comprises a female screw and the rotation driving shaft comprises a male screw that is screwed to the female screw.

6. The throttle valve according to claim 5 , wherein
the fixed sealing member is in contact with an inner peripheral face of the housing, and
the rotary sealing member is separated from the inner peripheral face of the housing, and in contact with the fixed sealing member, the motor shaft, and the rotation driving shaft.

Assignees

• Koganei Ltd

Inventors

• Saito Yutaka
• Oba Ryotaro

Classifications

• F16K31/047

  characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means (F16K31/043 takes precedence) · CPC title

• F16K41/06 Primary

  with at least one ring attached to both spindle and housing · CPC title

• F16K31/04

  using a motor · CPC title

• F16K27/029

  Electromagnetically actuated valves · CPC title

• F16K1/34

  Cutting-off parts, e.g. valve members, seats (F16K1/06, F16K1/12, F16K1/14, F16K1/26 take precedence) · CPC title