Cooling apparatus for hydrostatic transmission

Patent metadata

Field	Value
Publication number	US-11054198-B2
Application number	US-201916513158-A
Country	US
Kind code	B2
Filing date	Jul 16, 2019
Priority date	Nov 7, 2018
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

A cooling apparatus for a hydrostatic transmission includes a cooling body to be coupled with a hydrostatic transmission, a sidewall member protruding from the cooling body to surround a cooling flow path which cools a working fluid supplied from the hydrostatic transmission and discharges the working fluid into the hydrostatic transmission or a storage tank, an installing member protruding from the cooling body at a position spaced apart from the sidewall member to be disposed inside the sidewall member, a detour member connected to the installing member and protruding from the cooling body to extend in a first axial direction to allow the working fluid, which flows along the cooling flow path, to make a detour, and a plurality of protruding members protruding from the cooling body to be spaced apart from each of the sidewall member, the installing member, and the detour member in the cooling flow path.

First claim

What is claimed is:

1. A cooling apparatus for a hydrostatic transmission, comprising:
a cooling body to be coupled with a hydrostatic transmission;
a sidewall member configured to protrude from the cooling body to surround a cooling flow path which cools a working fluid supplied from the hydrostatic transmission and then discharges the working fluid into the hydrostatic transmission or a storage tank;
an installing member configured to protrude from the cooling body at a position spaced apart from the sidewall member to be disposed inside the sidewall member;
a detour member connected to the installing member and configured to protrude from the cooling body to extend in a first axial direction to allow the working fluid, which flows along the cooling flow path, to make a detour; and
a plurality of protruding members configured to protrude from the cooling body to be spaced apart from each of the sidewall member, the installing member, and the detour member in the cooling flow path,
wherein the protruding members are arranged in positions spaced apart from each other to form a through groove to allow the working fluid to pass therethrough.

2. The cooling apparatus of claim 1 ,
wherein the protruding members each comprise a contact surface which comes into contact with the working fluid which flows along the cooling flow path, and
wherein the contact surfaces are each formed to be a curved surface.

3. The cooling apparatus of claim 1 ,
wherein the protruding members each have a cylindrical shape while having the same diameter.

4. The cooling apparatus of claim 1 ,
wherein the protruding members are each formed to have a diameter of 7 mm or more and 10 mm or less.

5. The cooling apparatus of claim 1 ,
wherein the protruding members are each formed to satisfy an aspect ratio according to

0.58
<

D
L

<
0.84

,

and
wherein D refers to a diameter of the protruding member and L refers to a protruding length of the protruding member from the cooling body.

6. The cooling apparatus of claim 1 ,
wherein the sidewall member comprises a first sidewall disposed on one side of the detour member on the basis of a second axial direction perpendicular to the first axial direction, a second sidewall disposed on the other side of the detour member on the basis of the second axial direction, and a third sidewall disposed to be connected to each of the first sidewall and the second sidewall,
wherein supply protruding members among the protruding members are arranged in a supply area between the detour member and the first sidewall,
wherein one or more first supply protruding members among the supply protruding members are arranged to be spaced apart by the longest distance from the installing member on the basis of the first axial direction,
wherein first supply through grooves are arranged between the one or more first supply protruding members, the detour member, and the first sidewall on the basis of the second axial direction in the supply area,
wherein the one or more first supply protruding members and the first supply through grooves are formed to satisfy a total area ratio according to

0.31
<

SBA
t

SBA
t

+

SPA
t

<
0.46

,

and
wherein SBA t is a gross cross-sectional area of the one or more first supply protruding members and is a cross-sectional area on the basis of a supply cross section which is parallel to the second axial direction and passes a diameter of the one or more first supply protruding members between one side of the detour member and the first sidewall, and SPA t is a gross cross-sectional area of the first supply through grooves and is a cross-sectional area on the basis of the supply cross section.

7. The cooling apparatus of claim 1 ,
wherein the sidewall member comprises a first sidewall disposed on one side of the detour member on the basis of a second axial direction perpendicular to the first axial direction, a second sidewall disposed on the other side of the detour member on the basis of the second axial direction, and a third sidewall disposed to be connected to each of the first sidewall and the second sidewall,
wherein detour protruding members among the protruding members are arranged in a detour area between the detour member and the third sidewall,
wherein one or more first detour protruding members among the detour protruding members are arranged between an end surface of the detour member and the third sidewall on the basis of the first axial direction,
wherein first detour through grooves are arranged between the one or more first detour protruding members, the detour member, and the third sidewall on the basis of the first axial direction in the detour area,
wherein the one or more first detour protruding members and the first detour through grooves are formed to satisfy a total area ratio according to

0.31
<

DBA
t

DBA
t

+

DPA
t

<
0.46

,

and
wherein DBA t is a gross cross-sectional area of the one or more first detour protruding members and is a cross-sectional area on the basis of a detour cross section which is parallel to the first axial direction and passes through a diameter of the one or more first detour protruding members between the detour member and the third sidewall, and DPA t is a gross cross-sectional area of the first detour through grooves and is a cross-sectional area on the basis of the supply cross section.

8. The cooling apparatus of claim 1 ,
wherein the sidewall member comprises a first sidewall disposed on one side of the detour member on the basis of a second axial direction perpendicular to the first axial direction, a second sidewall disposed on the other side of the detour member on the basis of the second axial direction, and a third sidewall disposed to be connected to each of the first sidewall and the second sidewall,
wherein supply protruding members among the protruding members are arranged in a supply area between the detour member and the first sidewall while one or more first supply protruding members among the supply protruding members are arranged to be spaced apart by the longest distance from the installing member on the basis of the first axial direction,
wherein first supply through grooves are arranged between the one or more first supply protruding members, the detour member, and the first sidewall on the basis of the second axial direct

Assignees

• Ls Mtron Ltd

Inventors

• Choi Jong Rak
• Shin Jai Yoon
• Park Young Gil
• Nam Cheung Hyun
• Chung Nam Hyung
• Choi Shin Hwa

Classifications

• F28F2265/16

  for preventing leakage · CPC title

• F28F3/10

  Arrangements for sealing the margins · CPC title

• F16H39/00

  Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution (control of exclusively fluid gearing F16H61/38) · CPC title

• F28F2250/102

  with change of flow direction · CPC title

• F16H61/4165 Primary

  Control of cooling or lubricating · CPC title