JPS6240234Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a liquid injection device that injects liquid by horizontally inserting a cylindrical nozzle into an annular clearance of a liquid to be injected. especially,
This invention relates to an improvement of the nozzle structure.

(Prior Art) Generally, in an automobile transmission assembly factory, a predetermined amount of transmission oil is injected into the assembled transmission before shipment.

Conventionally, when injecting transmission oil into the transmission after assembly, oil was injected into the transmission case instead of through the normal oil injection hole provided in the transmission case in order to increase oil injection efficiency. A system is adopted in which the injection is performed through an annular clearance formed between the pump and the output shaft. That is, a cylindrical nozzle that is fitted horizontally into an annular clearance between the case of the transmission and the output shaft, and an oil that is connected to each nozzle and that is supplied with pressure into the nozzle by a pressure pump. An oil injection device including a supply pipe and an oil recovery pipe for sucking and recovering excess oil remaining in the nozzle with a vacuum pump was provided, and the nozzle was inserted into the clearance between the transmission case and the output shaft. In this system, a predetermined amount of oil is injected into the transmission through the gap between the nozzle and the transmission output shaft, and after the injection, the remaining oil in the nozzle is collected, and then the nozzle is removed from the transmission.

However, in the conventional oil injection system mentioned above,
Since the nozzle of the oil injection device is simply cylindrical, when the nozzle is inserted, the gap between the nozzle, which serves as the oil flow path, and the transmission output shaft is uniform in the circumferential direction, and the gap inside the nozzle is uniform. The oil that flows down and collects at the bottom has difficulty entering the transmission smoothly. Furthermore, if the oil pressure is increased to increase the oil injection speed, the nozzle may be pushed back and come out of the transmission due to the increased pressure inside the transmission, resulting in an unnecessarily shortened injection takt interval in the oil injection process. The problem was that I couldn't do it.

In addition, although excess oil is collected from inside the nozzle after injection, it is difficult to completely collect the oil that adheres to the inner wall of the nozzle, and this oil may drip from the opening at the tip of the nozzle. There was a problem in that it worsened the working environment.

(Purpose of the invention) The purpose of the invention is to solve all the problems of conventional liquid injection systems at once by specifying the structure of the nozzle in a liquid injection device equipped with a cylindrical nozzle as described above. The object of the present invention is to shorten the injection takt interval in the liquid injection process and improve the working environment.

(Structure of the invention) In order to achieve the above object, the structure of the invention is as follows:
In a cylindrical nozzle for liquid injection that is fitted horizontally and horizontally into an annular clearance of a liquid injection target (for example, an automobile transmission as described above), the inner diameter center of the cylinder body is eccentrically positioned below the outer diameter center, and The center of the tip opening of the nozzle is eccentrically located above the inner diameter center of the cylindrical body, and a wall portion is formed below the opening to protrude toward the center of the opening; An air relief section is formed at approximately the upper end by cutting out in the longitudinal direction of the nozzle. As a result, when the nozzle is inserted into the liquid injection target, the lower part of the liquid flow path gap formed by the nozzle and the liquid injection target is larger than the upper part. In addition to increasing the passage area of the part through which the main flow of the liquid flow passes, the air relief part on the outer circumferential surface of the nozzle allows communication between the inside and outside of the object to be injected, and the wall on the lower side of the nozzle tip opening allows the nozzle to be removed. It is designed to block the liquid inside the nozzle.

(Effect of the invention) Therefore, according to the invention, when inserting the nozzle,
Since the lower part of the liquid flow path gap between the nozzle and the liquid injection target is larger than the upper part, the liquid that flows into the nozzle from the liquid supply pipe flows smoothly into the liquid injection target. , the liquid injection efficiency can be increased. Moreover, since the air relief part on the outer circumferential surface of the nozzle communicates between the inside and outside of the object to be injected, the pressure inside the object to be injected does not increase as liquid is injected. It is possible to prevent the nozzle from falling off from objects. Furthermore, since the residual liquid when the nozzle is removed is blocked by the wall below the nozzle opening, it is possible to prevent the residual liquid from dripping, thereby shortening the injection takt interval in the liquid injection process. and can improve the working environment.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows an embodiment in which the present invention is applied to an oil injection device A for injecting transmission oil into a transmission B for an automobile. The rear end of the case B ₁ of the transmission B is formed into a cylindrical shape, and an output shaft B ₃ having a spline portion B ₂ on its outer peripheral surface is concentrically disposed within the rear end of the case B ₁ . That is, output shaft B ₃
Annular clearance between and rear end of case B ₁
B ₄ is formed. _B5 is a bushing press-fitted into the rear end of case _B1 , and _B6 is an oil seal.

The oil injection device A is equipped with a nozzle 1 made of a bottomed cylindrical body that is fitted horizontally and horizontally into an annular clearance _B4 of the transmission B. An oil supply pipe 2 is screwed into the nozzle 1 at the center of its bottom, and an oil recovery pipe 3 is screwed into the bottom of the nozzle 1. Excess oil remaining in the nozzle 1 is vacuum-suctioned through a recovery pipe 3 to be recovered and returned to the oil supply pipe 2.

The nozzle 1 has a pipe connecting part 1a to which an oil supply pipe 2 and an oil recovery pipe 3 are attached, and a fitting part 1b which is fitted into a clearance _B4 of a transmission B.
The fitting part 1b further includes a nozzle 1.
When inserted, it is divided into a thick wall portion 1c on the side of the tube connecting portion 1a whose outer peripheral surface is in close contact with the bush _B5 of the case _B1 of the transmission B, and a thin wall portion 1d on the tip side. And the second
As shown in the figures or FIG. 4, the fitting part 1b
The inner diameter center O ₁ of the cylindrical body in is eccentrically downward by a predetermined dimension (for example, 0.77 mm) with respect to the outer diameter center O ₂ .

Also, the center of the tip opening 1e of the nozzle 1
O ₃ is eccentric above the inner diameter center O ₁ of the cylindrical body by the same dimension (0.77 mm) as the eccentric dimension of the inner diameter center O ₁ with respect to the above outer diameter center O ₂ , that is, the above outer diameter center
It is located concentrically with _O2 . As a result, a wall portion 4 is formed below the tip opening 1e, projecting toward the center _O3 of the opening 1e.

Further, a horizontal air release section 5 is formed at the upper end of the outer circumferential surface of the cylinder of the fitting section 1b by cutting out the entire fitting section 1b horizontally in a face-shaving shape in the longitudinal direction. Further, at the upper end of the boundary between the pipe connecting portion 1a and the fitting portion 1b, the boundary portion is cut out in a concave shape, and a vertical air relief portion 6 that is continuous with the horizontal air relief portion 5 is formed. .

Next, the operation of the above embodiment will be explained.
The insertion part 1b of the nozzle 1 of the oil injection device A is connected to the annular clearance B ₄ between the rear end of the transmission _B and the output shaft, and the outer peripheral surface of the thick wall part 1c of the insertion part 1b is connected to the case B _1. After fitting the bush B ₅ in the rear end of the nozzle 1 so as to fit it closely, a predetermined amount of oil is pumped into the nozzle 1 from the oil supply pipe 2, and the oil flows between the inner surface of the nozzle 1 and the outer periphery of the output shaft B ₃ . It flows into the transmission B through the gap with the spline portion _B2 , thereby effecting oil injection.

In that case, since the inner diameter center O ₁ of the cylindrical body of the fitting part 1 b of the nozzle 1 is eccentric to the lower side than the outer diameter center O ₂ , the inner diameter of the nozzle 1, which becomes the oil flow path, and the outer periphery of the output shaft B ₃ The lower part of the gap between the parts is larger than the upper part, and a large passage area is ensured in the lower part. Therefore, the oil that is pressure-fed into the nozzle 1, descends, and concentrates at its lower part flows smoothly through the lower part of the gap between the inner surface of the nozzle 1 and the outer circumference of the output shaft _B3 , and flows into the transmission B. As a result, oil injection efficiency can be increased.

Moreover, since air relief parts 5 and 6 are formed at the upper end of the outer peripheral surface of the nozzle ₁ , the inside of the transmission B is communicates with the outside. Therefore, even if the oil pumping pressure is increased and the oil injection speed is increased,
Accordingly, the air in the transmission B is transferred to the air relief section 5,
The nozzle 1 is smoothly pushed out through the gap between the nozzle 6 and the case _B1 , and the nozzle 1 does not come out of the case _B1 due to the increase in pressure within the transmission B.
This makes it possible to increase the oil injection speed, thereby further improving oil injection efficiency.

In addition, in order to securely support the nozzle 1 to the transmission B by bringing the outer circumferential surface of the thick walled portion 1c of the insertion portion _1b of the nozzle 1 into close contact with the bushing _B5 on the inner surface of the case B1 of the transmission B, the thick walled portion 1c is fixedly supported on the transmission B. Due to the large rigidity of 1c, the nozzle 1 can be firmly supported and oil can be stably injected.

After such oil injection, the excess oil remaining in the nozzle 1 is sucked and recovered by the oil recovery pipe 3 and returned to the oil supply pipe 2. Next, the nozzle 1 is extracted from the clearance B ₄ between the case B ₁ and the output shaft B ₃ of the transmission B, thereby completing the oil injection operation for one transmission B.

Nozzle 1 immediately after being extracted from this transmission B
A small amount of oil remains attached to the inner surface of the nozzle 1, and this adhered oil gradually accumulates at the lower part of the inner surface of the nozzle 1 and then tends to drip from the tip opening 1e. Since a wall portion 4 is provided protruding from the lower side of the nozzle 1e, the oil accumulated in the lower part of the nozzle 1 is blocked by the wall portion 4 and does not drip from the opening portion 1e. the result,
It can prevent factory floors from getting dirty with oil and improve the working environment.

In the above embodiment, a case was explained in which the oil injection device A is used to inject oil into an automobile transmission B. However, in the present invention, a cylindrical nozzle is installed horizontally in an annular clearance of a liquid to be injected. It goes without saying that the present invention can also be applied to various other liquid injection devices that are fitted into the liquid injection device to inject liquid.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a front view of the nozzle cut away, and FIG. 2 is a front view of the nozzle.
The direction arrow view in the figure, FIGS. 3 and 4 are sectional views taken along the - line and - line in FIG. 1, respectively. A... Oil injection device, 1... Nozzle, 1e...
...Tip opening, 2...Oil supply pipe, 3...Oil recovery pipe, 4...Wall part, 5...Horizontal air relief part,
6... Vertical air relief section, B... Transmission, B ₁ ...
Case, _B3 ...Output shaft, _B4 ...Clearance.

Claims (1)

[Scope of utility model registration request] A cylindrical nozzle that is fitted horizontally into an annular clearance of a liquid to be injected, a liquid supply pipe that is connected to the nozzle and supplies the liquid under pressure into the nozzle, and a liquid supply pipe that sucks up excess liquid that remains inside the nozzle. and a liquid recovery pipe to be recovered, and the nozzle has a cylindrical body whose inner diameter center is eccentric downwardly with respect to the outer diameter center, and whose tip opening center is eccentrically upwardly than the cylindrical inner diameter center. a wall protruding toward the center of the opening is formed on the lower side of the opening;
The liquid injection device further comprises an air release section cut out in the longitudinal direction at substantially the upper end of the outer circumferential surface of the cylindrical body.