JP4212227B2 - Transmission oil circulation mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oil circulation mechanism of a transmission, and more particularly to a configuration of an oil circulation path having forced lubrication means.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, cases made of cast iron castings are known for vehicle transmission cases, particularly large vehicle transmission cases.
[0003]
[Problems to be solved by the invention]
On the other hand, it is effective to use an aluminum die cast to reduce vehicle weight and cost. However, since it is difficult to form an oil path by boring as in a conventional cast iron case, there is a demand for reducing the number of boring points as much as possible. In addition, due to the characteristics of aluminum die casting, there is a problem that a nest is likely to occur in the oil passage that is a partially thick portion and a nest is likely to be formed in the processed passage hole, which is not practical.
[0004]
In addition, in order to prevent the formation of nests and to facilitate the molding by aluminum die casting, it is only necessary to mold the hole to be the oil path at the time of aluminum die casting, but such a hole is molded by pin punching. In relation to this, there is a problem in that a strong design restriction occurs in the direction of the hole, and the degree of freedom in design is greatly reduced.
[0005]
The present invention has been proposed in view of the above-described problems, and provides an oil circulation mechanism for a transmission that can minimize the need for boring processing when forming an aluminum die-cast and has a high degree of design freedom. It is an object.
[0006]
[Means for Solving the Problems]
In the transmission oil circulation mechanism of the present invention, an oil pump and an oil filter are attached to a cover of a transmission constituted by aluminum die casting, and the cover is attached to the outside of the transmission from the discharge port of the oil pump. a first and oil line is processed hole communicating, and a second oil line is processed hole communicating an inlet of the oil passage inlet and said oil filter from the transmission external to the oil connection port to The first elongated hole communicating with the outlet of the oil filter communicates with the first groove, and the first groove is cast with the second groove provided in the middle of the first oil line. The first blind hole communicates, and a plate member is placed over the first elongated hole and the first groove.
According to the present invention having such a configuration, if only the first oil line 3 and the second oil line 5 are formed by boring, other oil paths can be formed at the time of aluminum die casting. is there. That is, a cast hole, a long hole, and a groove by a pin are formed at the time of casting, and the oil path other than the first oil line 3 and the second oil line 5 is formed by covering the long hole and the groove with a cover. It can be done.
[0007]
According to the present invention, the first oil line provided in the cover has an oil hole drilled in a check valve mounting surface to which the check valve is mounted, and the second elongated hole communicated with the check valve outlet. A second blind hole that communicates with the second elongated hole, the second blind hole communicates with the second oil line, and a bypass passage between the first oil line and the second oil line is provided. Is formed.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a cover 1 made of aluminum die cast attached to a case (not shown) of a transmission, and a bearing retainer 10a for supporting a main shaft 10 of the transmission is attached to the cover 1. An oil pump 2 for forcibly lubricating the transmission is attached to an end portion of a counter shaft (not shown) located below. Reference numerals 30 and 31 denote pressure-resistant oil hoses that circulate oil to auxiliary equipment outside the transmission.
[0009]
An oil outlet 2a of the oil pump 2 communicates with one end of a first oil line 3 that is a processing hole, and an oil connection port 3a to the outside is formed at the other end of the first oil line 3.
[0010]
An oil filter inlet 4 provided on a seating surface 19a to which an oil filter main body 19 (see FIG. 2) is attached communicates with one end of a second oil line 5 that is a processing hole, and the other end has an oil path inlet 5a. Is formed.
[0011]
The first elongated hole 6 communicating with an outlet (not shown) of the oil filter main body 19 communicates with the first groove 7, and the first oil line is supplied to supply oil to the first groove 7 and the main shaft 10. The second groove 9 provided in the middle is communicated with a first blind hole 8 which is cast, and the end of the first blind hole 8 is closed by a plug 8a.
[0012]
Further, the first oil line 3 is formed with an oil hole 3a from a mounting surface 24 to which the check valve 20 is attached, and a second long hole 21 communicating with the check valve outlet 21a is configured with reference to FIG. The second long hole 21 communicates with the second oil line 5 through the second blind hole 23, and the end of the second blind hole 23 is closed by a plug 23a to A bypass passage for the second oil line is formed.
[0013]
The first elongated hole 6, the first groove 7 portion, and the second groove 9 portion are covered with a plate to form an oil passage.
[0014]
FIG. 2 is a side view of FIG. 1, and a cartridge type element 18 is screwed into the oil filter main body 19, and between the oil hose 30 and the oil hose 31 (see FIG. 1) connected to the connection port 3a. An oil cooler (not shown) is interposed in the case.
[0015]
As described above, according to the present invention, if only the first oil line 3 and the second oil line 5 are processed holes, the other oil path is formed with a cast hole, a long hole, and a groove formed by a pin during casting, The slot and groove can be covered with a cover to provide an oil path.
[0016]
In addition, for example, thin burrs are generated at the communication portion 7a between the first groove 7 and the first blind hole 8 at the time of casting, but these can be easily removed by end milling or chipping.
[0017]
【The invention's effect】
This invention is comprised as mentioned above and can show | play the following outstanding effects.
(1) It is possible to significantly reduce the number of holes that must be formed by boring in the oil path of the case and cover that are formed by aluminum die casting of the transmission.
(2) Since long holes and grooves are used, it is possible to reduce the number of punched holes to be pinned. As a result, the degree of freedom in design is increased, and the manufacturing cost of the mold can be reduced.
(3) Therefore, a lightweight and reliable transmission case and cover can be provided.
[Brief description of the drawings]
FIG. 1 is a plan view of a transmission cover showing an embodiment of the present invention.
FIG. 2 is a side view of FIG.
FIG. 3 is a cross-sectional view showing a state in which a check valve is attached to FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cover 2 ... Oil pump 3 ... 1st oil line 5 ... 2nd oil line 6 ... 1st long hole 7 ... 1st groove | channel 8 ... 1st blind hole 9 ... 2nd groove | channel 21 ... 2nd 2 long holes 23 ... second blind hole

Claims (2)

An oil pump (2) and an oil filter (19) are attached to the cover (1) of the transmission constructed by aluminum die casting, and the discharge port (2a) of the oil pump is attached to the cover (1 ). A first oil line (3) which is a processing hole communicating with an oil connection port (3a) from the transmission to the outside of the transmission, an oil path inlet (5a) from the transmission outside, and an inlet (4) of the oil filter, And a second oil line (5) which is a processing hole communicating with the first elongated hole (6) communicating with the outlet of the oil filter (19) communicates with the first groove (7). The first groove (7) is communicated with a second groove (9) provided in the middle of the first oil line (3) through a first blind hole (8) which is cast, A plate member is placed over the first slot (6) and the first groove (7). Oil circulation system of transmission according to claim. In the first oil line (3) provided in the cover (1), an oil hole (3a) is drilled in a check valve mounting surface (24) to which a check valve (20) is mounted, and the check valve outlet (21a) ) And a second blind hole (23) communicating with the second elongated hole (21), the second blind hole (23) being the second elongated hole (23). The oil circulation mechanism according to claim 1, wherein a bypass passage of the first oil line (3) and the second oil line (5) is formed in communication with the oil line (5) .

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