JP2015124783A - Heat exchanger attachment structure of gear change device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachment structure of a lubricant heat exchanger of a gear change device which can enlarge a freedom of an arrangement position, and can avoid problems of the leakage of an internal fluid, the complication of the structure, a thermal influence and an increase of the number of part items.SOLUTION: In a heat exchanger attachment structure of a gear change device 1 which adjusts a temperature of a lubricant to a proper temperature, a heat exchanger 6 is attached to a device case 11 in a state that a base plate 7 is separated from an outer surface 2' of a device case 11, a lubricant introduction hole 7b and a lubricant derivation hole 7c are opened at a lower face of the base plate 7, connecting ends 12a, 13a of introduction/derivation tubes 12, 13 extended from the device case 11 are inserted into the introduction hole 7b and the derivation hole 7c, and the connecting ends 12a, 13a are pressure-fixed to seal faces c which are formed in the introduction hole 7b and the derivation hole 7c with flare nuts 14, 14 which are screwed into the introduction hole 7b and the derivation hole 7c.

Description

The present invention relates to a structure for mounting a heat exchanger, for example, used in a transmission of an automobile, to a device case of a heat exchanger that keeps lubricating oil at an appropriate temperature.

In a transmission for an automobile, a heat exchanger is generally provided in order to keep the lubricating oil at an appropriate temperature, and a conventional heat exchanger mounting structure is disclosed in, for example, Patent Document 1. In this conventional structure, the heat exchanger is directly attached to the outer surface of the torque converter case coupled to the transmission case, and the inlet and outlet ports that are open on the lower surface of the heat exchanger are formed inside the torque converter case. In addition, a structure is adopted in which the lubricating oil introduction path and the outlet path that open to the outer surface of the case are directly connected. Also, a cooling water introduction short pipe and a lead short pipe project from the upper surface of the heat exchanger, and the short pipe is connected to the radiator by a rubber hose or the like.

Japanese Patent No. 4730408

In the conventional structure, the case where the lubricating oil is introduced and led out is a case internal pipe, so that the mounting position of the heat exchanger is restricted to a portion where the internal pipe can be formed and the internal structure of the case is complicated. is there.

Further, since the heat exchanger is directly fixed to the outer surface of the case, there is a problem that it is easily affected by heat from the inside of the case and it is difficult to obtain stable heat exchange performance.

In order to avoid the problems of the restriction of the mounting position, the complexity of the internal structure, and the heat effect, a connecting short pipe is formed as employed for introducing and deriving cooling water in the conventional structure, and the connecting short pipe When a rubber hose or the like is connected, there is a concern that the internal fluid may leak from the connecting portion, and there is a problem that the number of parts increases due to the necessity of a connection short pipe, a rubber hose or the like.

The present invention has been made in view of the above-described conventional situation, and can increase the degree of freedom of the arrangement position, and can avoid the problems of leakage of internal fluid, complicated structure, thermal influence, and increase in the number of parts. An object is to provide an exchanger mounting structure.

The present invention provides a heat exchanger mounting structure for a transmission that adjusts the temperature of lubricating oil to an appropriate temperature.
The heat exchanger has a base plate attached to the device case, and a heat exchange chamber formed on the base plate and surrounded by a cover, and the base plate is separated from the outer surface of the device case. A cooling water and / or lubricating oil introduction hole and a lead-out hole are opened on the lower surface of the base plate, and the introduction hole and the lead-out hole extend from the device case and / or the engine cooling water channel. A connecting end portion of a tube to be provided is inserted, and the connecting end portion is pressed and fixed to a sealing surface formed inside the introduction hole and the lead-out hole by a pressing member coupled to the introduction hole and the lead-out hole. It is characterized by that.

According to the present invention, the heat exchanger is composed of the base plate and the heat exchanger main body, and the base plate is attached in a state of being separated from the outer surface of the device case, so that the heat influence from the inside of the case is avoided or It can be suppressed and stable heat exchange performance can be maintained.

Also, a cooling water and / or lubricating oil introduction hole and a lead-out hole are opened in the base plate, and a connection end portion of a tube extending from the device case and / or the engine cooling water passage is inserted into the opening, and the connection end portion is Since the pressure member is pressed and fixed to the sealing surfaces of the introduction hole and the lead-out hole, for example, leakage of internal liquid, which is a concern when a rubber hose is connected to a connection short pipe, can be prevented and an increase in the number of parts can be avoided.

Furthermore, since internal piping is not required, the internal structure of the case can be simplified and the degree of freedom of the mounting position can be increased.

It is a perspective view of the heat exchanger attachment structure of the transmission which concerns on Example 1 of this invention. It is a top view of the attachment structure. It is a side view of the said attachment structure. It is sectional drawing (IV-IV sectional view taken on the line of FIG. 2) of the said attachment structure. It is a cross-sectional enlarged view of the coupling | bond part of the said attachment structure.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1-5 is a figure for demonstrating the heat exchanger attachment structure of the transmission which concerns on Example 1 of this invention.

In the figure, reference numeral 1 denotes a continuously variable transmission for an automobile, and a device case 11 of the continuously variable transmission 1 includes a torque converter case 2 that houses a torque converter to which engine rotation is input, and a continuously variable transmission such as CVT. And a transmission case 3 to be accommodated. The transmission case 3 and the torque converter case 2 are coupled to each other by coupling bolts 4 at the coupling flange portions 3 a and 2 a formed on the respective mating surfaces. A case cover 5 for closing the rear end opening of the transmission case 3 is detachably attached to the transmission case 3 on the side opposite to the torque converter case.

A heat exchanger 6 is attached to a portion of the torque converter case 2 near the coupling flange portion 2a with a mounting bracket 9 spaced apart from the outer surface 2 'of the torque converter case 2.

The heat exchanger 6 includes a base plate 7 formed of a thick plate and a heat exchange chamber 8 disposed on the upper surface of the base plate 7 and surrounded by a thin cover 8a. A flange portion 7a formed on the base plate 7 is fastened and fixed to the flange portion 9a of the mounting bracket 9 with bolts 10a and nuts 10b. The mounting bracket 9 has a pair of leg portions 9b, 9b bent downward, and the leg portions 9b, 9b are fastened and fixed to the flange portion 2a of the torque converter case 2 by the coupling bolts 4. . Thus, the base plate 7 of the heat exchanger 6 is spaced upward from the outer surface 2 ′ of the torque converter case 2.

Further, L-shaped connecting short pipes 8b and 8c for introducing and leading out cooling water are welded and fixed to the upper surface of the cover 8a of the heat exchanger 6. Although not shown, the connecting short pipes 8b and 8c are connected to the engine cooling water channel by a cooling water hose so that the cooling water circulates between the heat exchanger 6 and the engine cooling water channel. .

Further, an introduction hole 7b and a lead-out hole 7c communicating with the lubricating oil chamber side of the heat exchange chamber 8 through an oil passage d are opened on the lower surface of the base plate 7 of the heat exchanger 6. Female threads are formed on the inner peripheral surfaces of the hole 7b and the lead-out hole 7c. Connection end portions (tip portions) 12a and 13a of the lubricating oil introduction tube 12 and the lead-out tube 13 are inserted into the introduction hole 7b and the lead-out hole 7c, and the other ends of the lead-in and lead-out tubes 12 and 13 are connected to each other. The transmission case 3 is connected in communication.

The connection ends 12a and 13a of the introduction tube 12 and the lead-out tube 13 are coupled to the introduction hole 7b and the lead-out hole 7c in a mechanically sealed state by flare nuts (pressing members) 14 and 14, respectively.

The flare nut 14 is a cylindrical member having a through hole 14a in the shaft center and an external thread on the outer peripheral surface. A pressing surface b is formed in a tapered hole shape at the tip of the through hole 14a. In addition, a seal portion a is formed in an outwardly expanding taper shape corresponding to the pressing surface b at the distal ends of the connection end portions 12a and 13a of the introduction tube 12 and the lead-out tube 13. Furthermore, a sealing surface c is formed in a taper shape corresponding to the pressing surface b at the bottom of the introduction and extraction holes 7b and 7c.

By tightening the flare nut 14, the pressing surface b of the flare nut 14 introduces and seals the seal portion a of the outlet tubes 12 and 13 to the sealing surface c of the inlet and outlet holes 7b and 7c. As a result, the lead-in and lead-out tubes 12 and 13 are oil-tightly connected to the base plate 7.

According to the first embodiment, the heat exchanger 6 is composed of the base plate 7 and the heat exchange chamber 8, and the heat exchanger 6 is attached in a state where the base plate 7 is separated from the outer surface 2 ′ of the torque converter case 2. Therefore, the heat influence from the inside of the device case 11 can be avoided or suppressed, and stable heat exchange performance can be maintained.

Further, since the mounting bracket 9 that supports the heat exchanger 6 is fixed to the device case 11 using the connecting bolt 4 that connects the torque converter case 2 and the transmission case 3, an increase in the mounting bracket fixing bolt is avoided. it can.

Also, a lubricating oil introduction hole 7b and a lead-out hole 7c are opened in a base plate 7 made of a thick plate, and connection ends 12a of lead-in and lead-out tubes 12 and 13 extending from the transmission case 3 to the openings 7b and 7c. 13a are inserted and arranged, and the seal portion a at the tip of the connection end portions 12a and 13a is pressed and fixed to the seal surface c of the introduction hole 7b and the lead-out hole 7c by the pressing surface b of the flare nut 14. It is possible to prevent leakage of internal liquid, which is a concern when a rubber hose is connected to the pipe, and to suppress an increase in the number of parts.

Furthermore, since no internal piping is required, the internal structure of the device case 11 can be simplified and the degree of freedom of the mounting position can be increased. For example, the heat exchanger 6 can be disposed not only above the outer surface of the torque converter case 2 as in the present embodiment but also above the outer surface of the transmission case 3.

In the embodiment, the heat exchanger is disposed away from the outer surface of the case via the mounting bracket. However, in the present invention, a support boss portion is provided on the case side, and the heat boss portion is provided on the support boss portion. The base plate may be fixed with bolts.

In addition, the lubricating oil tube is connected to the base plate in a mechanically sealed state. However, in the present invention, the cooling water tube may be connected to the lower surface of the base plate in a mechanically sealed state. Both tubes may be connected to the lower surface of the base plate in a mechanical seal.

DESCRIPTION OF SYMBOLS 1 Transmission device 2 'Case outer surface 6 Heat exchanger 7 Base plate 7b Lubricating oil introduction hole 7c Lubricating oil outlet hole 8 Heat exchange chamber 8a Cover 11 Device case 12 Lubricating oil introduction tubes 12a, 13a Part)
13 Lubricating oil outlet tube 14 Flare nut (pressing member)
c Sealing surfaces inside the inlet and outlet holes

Claims (1)

In the heat exchanger mounting structure of the transmission that adjusts the temperature of the lubricating oil to an appropriate temperature,
The heat exchanger has a base plate attached to the device case, and a heat exchange chamber formed on the base plate and surrounded by a cover, and is separated from the outer surface of the device case. Attached,
A cooling water and / or lubricating oil introduction hole and a lead-out hole are formed in the lower surface of the base plate, and a tube extending from the apparatus case and / or the engine cooling water channel is connected to the introduction hole and the lead-out hole. An end is inserted, and the connection end is pressed and fixed to a seal surface formed inside the introduction hole and the lead-out hole by a pressing member coupled to the introduction hole and the lead-out hole. Heat exchanger mounting structure for transmission.

Images