Transmission and manufacturing method of the same

• US 10,151,380 B2
• Filed: 09/15/2016
• Issued: 12/11/2018
• Est. Priority Date: 09/29/2015
• Status: Active Grant

• Current Assignee: Mazda Motor Corporation
• Original Assignee: Mazda Motor Corporation
• Inventors: Uesugi, Tatsuya, Ueda, Kazuhiko
• Primary Examiner(s): Rogers, Adam D
• Application Number:
  US15/267,014
• Publication Number:
  US 20170089447A1
• Time in Patent Office: 817 Days
• CPC Class Codes: F16H 57/02 Gearboxes; Mounting gearing therein
• CPC Class Codes: F16H 57/03 characterised by means for reinforcing gearboxes, e.g. ribs
• CPC Class Codes: F16H 57/0415 Air cooling or ventilation; Heat exchangers; Thermal insulations
• CPC Class Codes: F16H 57/0417 Heat exchangers adapted or integrated in the gearing
• CPC Class Codes: F16H 57/0424 Lubricant guiding means in the wall of or integrated with the casing, e.g. grooves, channels, holes means for guiding lubricant into an axial channel of a shaft F16H57/0426

Abstract

A transmission is provided, which includes a transmission case accommodating a transmission mechanism, and a heat exchanger for exchanging heat between oil supplied to a given location inside the transmission case and a heat medium supplied from the outside of the transmission case, the heat exchanger being provided between an external surface and an internal surface of the transmission case.

Claims

1. A transmission, comprising:

a transmission case accommodating a transmission mechanism; and

a heat exchanger for exchanging heat between oil supplied to a given location inside the transmission case and a heat transfer medium supplied from the outside of the transmission case, the heat exchanger being provided between an external surface and an internal surface of the transmission case,

wherein the heat exchanger is provided with an oil channel where the oil flows and a heat-medium channel where the heat transfer medium flows, and peripheral walls of the oil channel and the heat-medium channel are integrally provided with a peripheral wall of the transmission case, and

wherein the oil channel and the heat-medium channel extend in directions perpendicular to a thickness of the peripheral wall of the transmission case and are alternatingly arranged along the thickness.

2. The transmission of claim 1, wherein the transmission case includes:

an external wall part constituting the external surface;

an internal wall part disposed inwardly from the external wall part and separated from the external wall part, the internal wall part constituting the internal surface; and

a reinforcement part integrally connecting the external wall part and the internal wall part,

wherein the heat exchanger is provided between the external wall part and the internal wall part.

3. A transmission, comprising:

a transmission case accommodating a transmission mechanism; and

a heat exchanger for exchanging heat between oil supplied to a given location inside the transmission case and a heat transfer medium supplied from the outside of the transmission case, the heat exchanger being integrally provided to at least a part of a peripheral wall of the transmission case,

wherein the heat exchanger is provided with an oil channel where the oil flows and a heat-medium channel where the heat transfer medium flows, and peripheral walls of the oil channel and the heat-medium channel are integrally provided with the peripheral wall of the transmission case, and

wherein the oil channel and the heat-medium channel extend in directions perpendicular to a thickness of the peripheral wall of the transmission case and are alternatingly arranged along the thickness.

4. The transmission of claim 3, wherein the transmission case is a tubular member extending parallel to axial directions of an input shaft of the transmission mechanism.

5. A method of manufacturing a transmission provided with a transmission case that accommodates a transmission mechanism, and a heat exchanger for exchanging heat between oil supplied to a given location inside the transmission case and a heat transfer medium supplied from the outside of the transmission case, comprising:

integrally forming the heat exchanger with a peripheral wall of the transmission case by a three-dimensional lamination modeling method, the heat exchanger being formed in at least a part of the peripheral wall of the transmission case.

6. The method of claim 5, wherein an external wall part constituting an external surface of the peripheral wall of the transmission case, an internal wall part disposed inwardly from the external wall part and separating from the external wall part, the internal wall part constituting an internal surface of the peripheral wall, and a reinforcement part integrally connecting the external wall part and the internal wall part, are formed in at least the part of the peripheral wall, the heat exchanger being formed between the external wall part and the internal wall part.

7. The method of claim 6, wherein an oil channel where the oil flows and a heat-medium channel where the heat transfer medium flows are formed in the heat exchanger, and the reinforcement part is comprised of peripheral walls of the oil channel and the heat-medium channel.

8. The method of claim 7, wherein the peripheral wall of the transmission case, the heat exchanger, and a valve body of a hydraulic control device for controlling the transmission mechanism are integrally formed by the three-dimensional lamination modeling method so that the oil channel fluidly communicates with an oil channel of the valve body by being coupled thereto.

9. The method of claim 5, wherein the peripheral wall of the transmission case is formed into a tube having an axial center parallel to a laminating direction of the three-dimensional lamination modeling method.