JPH0444919Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is configured so that the lubricating oil in the manual gear transmission case is once guided outside, cooled, and then returned back into the transmission case. This invention relates to a mounting structure for an oil cooling pump.

(Prior Art) Conventionally, as shown in, for example, Japanese Utility Model Application Publication No. 56-31683, for a final reduction gear case for a vehicle,
A configuration in which a pump for pressure-feeding lubricating oil is attached is known. In this configuration, the drive shaft of the pump body is connected to a predetermined rotary shaft within the case through a spline connection so that rotation can be transmitted. In addition, the outer circumferential surface of the pump body is fitted with the inner circumferential surface of the mounting window of the case with high precision, thereby positioning the pump body relative to the case.
Furthermore, the centering accuracy between the rotating shaft inside the case and the drive shaft of the pump body is maintained.

(Problems to be solved by the invention) In the above conventional structure, the drive shaft of the pump body is connected to the rotating shaft in the case so that rotation can be transmitted through spline coupling, so both shafts are It is necessary to perform centering with high accuracy, and for this purpose, highly accurate positioning is required when assembling the pump body to the assembly window of the case. However, in reality, it is difficult to ensure centering accuracy between the rotating shaft inside the case and the drive shaft of the pump body due to the accumulation of machining dimensional tolerances of the assembly window of the case or each part of the pump body. Become. At the same time, the matters to be managed by the assembler become complicated, making it difficult to ensure quality and making the assembly unsuitable for mass production.

(Means for Solving the Problems) In order to solve the above problems, the mounting structure of the oil cooling pump in the manual gear transmission of the present invention is configured as follows.

That is, as is clear from FIG. 1, there is an assembly window 2 opened in the side wall of the transmission case 1 so as to be located almost parallel to the counter gear shaft 3 inside this case 1, and this assembly window 2. A pump body 10 is assembled into the transmission case 1 through the pump body 10, and a lid portion (retainer portion) 11a formed on the pump body 10 and attached to the side wall of the transmission case 1 so as to close the assembly window 2. , a pump drive shaft 12 which is also substantially parallel to the counter gear shaft 3 with respect to the pump body 10 and whose both ends are rotatably supported; The pump body 10 is provided with an externally toothed gear 20 that meshes with the counter gear 3a of the counter gear shaft 3 when the pump body 10 is assembled into the transmission case 1 through the assembly window 2.

(Function) According to the above configuration, regarding the assembly of the pump body 10 to the transmission case 1, this pump body 1
The rotational drive system is connected to the drive shaft 12 of the transmission case 1 by meshing the externally toothed gear 20 fixed to the drive shaft 12 with the existing gear 3a inside the transmission case 1. Since these two gears 20 and 3a mesh with each other through external teeth, the tolerance range for their meshing tolerance is wide, and therefore the accuracy of assembling the pump body 10 to the assembly window 2 of the transmission case 1 is relatively rough. It is possible to set it to . That is, positioning of the pump body 10 with respect to the assembly window 2 of the transmission case 1 is achieved by joining the retainer portion 11a to the outer peripheral surface of the assembly window 2 of the transmission case 1, and connecting this portion with the bolts 23. It only needs to be fixed, and the assembly work is very simple.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

First, in FIGS. 3 and 4, reference numeral 1 indicates a transmission case, and 2 indicates an assembly window for a power take-off (hereinafter abbreviated as "PTO").
3 shows a state in which the cover (not shown) is removed and opened from the PTO assembly window 2, and FIG. 4 shows the state in which the assembly window 2 is used to shift the pump body 10 of this embodiment. The state where it is assembled into the machine case 1 is shown.

As shown in FIG. 5, which schematically represents a power plant for a vehicle, the pump body 10 guides the lubricating oil inside the transmission case 1 to the outside, cools it, and returns it back into the transmission case 1. It constitutes one component in the oil circulation circuit 25 for this purpose.
That is, in the oil circulation circuit 25 shown in FIG. 5, reference numeral 26 indicates an oil cooler, and 27 indicates an oil cleaner, and these are connected to the pump body 10 by pipes 25a and 25b.

Now, a first diagram showing the structure of the attachment part of the pump body 10 to the above-mentioned transmission case 1 in a plan cross section.
In FIG. 2, which is a cross-sectional view taken along the line 1 in FIG.
An outer rotor 14 having a corresponding inner shape of a trochoid curve is rotatably incorporated into the casing 11, and the inside of the casing 11 is kept oil-tight by a cover 15 fixed thereto with a plurality of bolts 16. Keep it blocked. Further, a drive shaft 12 rotatably supported by the casing 11 has one end coupled to the inner rotor 13 so as to transmit rotation. Moreover,
On the axis of this drive shaft 12, there is an externally toothed gear 2.
0 is fixed by a pin 21 so as to rotate together with this drive shaft 12.

On the other hand, a first chamber 17 and a second chamber 18 communicating with the inside of the casing 11 are formed on the inner surface of the cover 15 of the casing 11, and the first chamber 17 has a suction port 1.
7a, and the second chamber 18 has a discharge port 1.
8a are formed in communication with each other. 1st
An oil strainer 19 disposed at the bottom of the transmission case 1 is connected to the suction port 17a communicating with the chamber 17, as shown in FIG. In addition, a pipe 25 communicating with the oil cooler 26 of the oil circulation circuit 25 shown in FIG.
a are connected. A return port 4 communicating with the inside of the transmission case 1 is formed in the casing 11 of the pump body 10, and the return port 4 is connected to the oil circulation circuit 25 shown in FIG.
A pipe 25b leading to an oil cleaner 27 is connected thereto.

A retainer portion 11a is integrally formed on the outer circumference of the casing 11 of the pump body 10, and as shown in FIGS. When the retainer portion 11a is assembled into the interior thereof, the retainer portion 11a is joined to the outer circumferential surface of the assembly window 2. Thereby, the pump body 10 is positioned relative to the transmission case 1 in the depth direction (horizontal direction in FIGS. 1 and 2). By fixing this retainer portion 11a to the transmission case 1 side with a plurality of bolts 23, the pump body 10 is moved in the vertical direction (the vertical direction in FIG. 2) and the horizontal direction with respect to the transmission case 1. (Vertical direction in Figure 1)
positioning is also performed. In the state in which the pump body 10 is assembled in the transmission case 1 in this manner, the gear 20 of the drive shaft 12 is connected to one counter formed on, for example, the counter gear shaft 3 in the transmission case 1. It meshes with gear 3a (see Figure 1).

In the above configuration, the procedure for assembling the pump body 10 to the transmission case 1 will be explained first.The pump body 10 is assembled into the transmission case 1 through the PTO assembly window 2 in the transmission case 1, and The retainer portion 11a of the casing 11 of the pump body 10 is joined to the outer peripheral surface of the assembly window 2, and the retainer portion 11a is fixed to the transmission case 1 with a plurality of bolts 23. As a result, as described above, the pump body 10 is positioned in the depth direction with respect to the transmission case 1.
All positioning in the vertical and horizontal directions is performed. Moreover, in this state, the gear 20 fixed to the drive shaft 12 of the pump body 10 meshes with the counter gear 3a on the counter gear shaft 3 in the transmission case 1 so as to be able to transmit rotation.

When assembling the pump body 10, the meshing tolerance between the gear 20 of the drive shaft 12 and the counter gear 3a is very wide because they are both externally toothed gears. Therefore, the assembly of the pump body 10 to the transmission case 1 does not require much precision, and even relatively rough positioning can be used to provide rotational drive to the drive shaft 12 of the pump body 10. A connection will be made. Note that this means that the counter gear 3a and the pump body 1
By providing a large dimensional difference between the tooth width of the drive shaft 12 and the gear 20 at 0 (see FIG. 1), it becomes possible to set a larger allowable range of the meshing tolerance. In addition, the pump body 10
By using the PTO assembly window 2 of the transmission case 1 to assemble the pump body 10, there is no need to change the shape of the transmission case 1 in conjunction with the assembly of the pump body 10.

The pump body 10 incorporated into the transmission case 1 as described above is then connected to the oil circulation circuit 25 shown in FIG. 5, and forms the main component of this oil circulation circuit 25. As the counter gear shaft 3 in the transmission case 1 rotates, the drive shaft 12 continuously rotates through the counter gear 3a and the gear 20 of the pump body 10 that meshes with the counter gear 3a. As a result, the inner rotor 13 and outer rotor 14 rotate continuously in the direction of the arrow in FIG. 2 within the casing 11. Accordingly, as is generally well known, the first chamber 17 of the pump body 10 becomes a negative pressure, and lubricating oil is sucked from the oil strainer 19 in the transmission case 1 through its suction port 17a. The lubricating oil sucked into the first chamber 17 is sent to the second chamber 18 as the rotors 13 and 14 rotate, and is sent from the discharge port 18a to the oil cooler 26 through the pipe 25a shown in FIG. . The cooled oil is transferred to the oil cleaner 27 and the pipe 25.
Casing 1 in pump body 10 through b
The transmission case 1 is returned to the transmission case 1 through the return port 4 of the transmission case 1. In this way, transmission case 1
The lubricating oil inside is cooled and can cope with higher speeds of the vehicle.

Note that the pump body 10 described above is the transmission case 1.
Since it is assembled using the PTO assembly window 2 in , the pump body 10 can be attached and detached as necessary, and when the pump body 10 is not required, the PTO assembly window 2 is used. Install the existing cover (not shown) to close it off, or
Alternatively, it is of course possible that components of the power take-off (not shown) are assembled.

(Effects of the invention) As described above, according to the invention, the pump body is assembled into the transmission case from the direction perpendicular to the axis of the counter gear shaft through the assembly window opened in the side wall of the transmission case. In addition to improving the assemblability of the counter gear shaft, there is no need to consider or change the layout of other devices located before and after the transmission case in the axial direction of the counter gear shaft, increasing the degree of freedom in design.

The drive shaft of the pump body is substantially parallel to the counter gear shaft, and both ends of the drive shaft are rotatably supported. Since the external gear that meshes with the gear is fixed, when the external gear rotates in conjunction with the rotation of the counter gear, no straining force is applied to the support part of the drive shaft, resulting in stability. It is possible to drive the pump with

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a plan sectional view showing the assembly part of the pump body to the transmission case, Fig. 2 is a sectional view taken along the line - - in Fig.
The figure is a front view showing the external appearance of the transmission case.
This figure is a front view showing the state in which the pump body is attached to the transmission case in correspondence with FIG. 3, and FIG. 5 is a plan view showing the relationship between the power plant of the vehicle and the oil circulation circuit. 1...Transmission case, 2...Assembly window, 3a...
Gear in transmission case, 10...Pump body, 1
1a... Retainer portion of the pump body, 12... Drive shaft of the pump body, 20... Gear of the pump body, 23... Bolt, 25... Oil circulation circuit.

Claims (1)

[Scope of claim for utility model registration] Lubricating oil inside the transmission case is led to the outside of the case, cooled, and then returned to the inside of the case.
The mounting structure of the oil cooling pump for circulating lubricating oil includes: an assembly window opened to the side wall of the transmission case so as to be located approximately parallel to the counter gear shaft within the case; a pump body that is assembled into the transmission case through a window; a lid formed on the pump body and attached to a side wall of the transmission case so as to close the assembly window;
Similarly, the drive shaft of the pump is substantially parallel to the counter gear shaft and rotatably supported at both ends of the pump body, and the drive shaft is fixed on an axis between both support parts of the drive shaft, and the pump body A mounting structure for an oil cooling pump in a manual gear transmission, comprising an externally toothed gear that meshes with a counter gear of the counter gear shaft when assembled into a transmission case through a window.