One-way valve and transmission

A transmission comprising:

• a hydraulic control assembly in which a plurality of hydraulic control valves are incorporated;
• and
• a case in which the hydraulic control assembly is housed, wherein:
• a one-way valve is disposed in the case, the one-way valve is inserted from a first inner circumferential surface side into and fixed to a pipe,
• the pipe includes a hollow section which includes the first inner circumferential surface, a second inner circumferential surface, and a third inner circumferential surface, inner diameters of which decrease in this order,
• the one-way valve includes:
• a cylindrical tube section having a hollow bore formed therein, wherein an outlet end of the cylindrical tube section is inserted into and fixed to an inside of the pipe, the cylindrical tube section having a through-hole formed therein in fluid communication with the hollow bore thereof, and which is configured to receive oil flowing therethrough in an axial direction during use;
• a columnar flow control section that is housed inside the pipe, includes in another end thereof, a plurality of lateral holes and an opening through which oil coming from the cylindrical tube section flows, the columnar flow control section configured to selectively block flow of oil therethrough when the inlet end is inserted into a one-side opening in the outlet end of the cylindrical tube sections;
• a collar member that is inserted, in a freely reciprocating manner, over one end of the columnar flow control section and contacts a step level difference, the collar member having a diameter larger than the inner diameter of the third inner circumferential surface, and wherein the step level difference is formed by a difference in inner diameter between the second inner circumferential surface and the third inner circumferential surface;
• a spring installed between the inlet end portion of the columnar flow control section and the collar member;
• and
• a retainer clip that is fixed to a tip of the columnar flow control section and that retains prevents the collar member thereon.

A one-way valve assembly, comprising a pipe having a hollow section formed therein and a one-way valve disposed in the hollow section of the pipe,

• wherein the hollow section has a first inner circumferential surface, a second inner circumferential surface, and a third inner circumferential surface, inner diameters of which decrease in this order,
• wherein a portion of the one-way valve is received in the hollow section of the pipe at the first circumferential surface thereof, and wherein the one-way valve comprises:
• a cylindrical tube section having a hollow bore formed therein, wherein an outlet end of the cylindrical tube section is inserted into and fixed to an inside of the pipe, the cylindrical tube section having a through-hole formed therein in fluid communication with the hollow bore thereof, and which is configured to receive oil flowing therethrough in an axial direction during use;
• a columnar flow control section that is housed inside the pipe and includes, in an inlet end thereof, a plurality of lateral holes and also having an opening formed therein through which oil from the cylindrical tube section flows during use, the flow control section configured to selectively block a flow of oil therethrough when the inlet end is inserted into a one-side opening in the outlet end of the cylindrical tube section;
• a collar member that is slidably disposed, in a freely reciprocating manner, over one end of the columnar flow control section and contacts a step level difference inside the pipe, the collar member provided with a plurality of cantilevered projections that are formed radially thereon, the projections defining open spaces therebetween, the collar member having a diameter larger than the inner diameter of the third inner circumferential surface, and wherein the step level difference is formed by a difference in inner diameter between the second inner circumferential surface and the third inner circumferential surface of the pipe's hollow section;
• a spring installed between an end portion of the columnar flow control section and the collar member;
• and
• a retainer clip that is fixed to a tip of the columnar flow control section and that retains the collar member thereon,
• wherein an inlet portion of the cylindrical tube section has a hollow interior formed therein having a first diameter, and an outlet end of the cylindrical tube section has an enlarged diameter portion formed therein forming a step portion which defines a seat configured to receive the inlet end of the columnar flow control section therein.