JP7345015B2 - Vehicle breather structure - Google Patents

Description

The present invention relates to a breather structure for suppressing pressure rise within a vehicle case.

For example, various gears are housed inside the case of a transmission installed in a vehicle. When the temperature inside the case rises due to the rotation of these gears, the internal pressure of the case increases and the oil inside the case is forced out of the case. Problems such as leakage may occur.

Therefore, vehicles are provided with a breather device that serves as a ventilation device that communicates the inside of the case with the atmosphere and suppresses a rise in pressure inside the case (see, for example, Patent Document 1). This breather device connects the inside of the case to the atmosphere by opening the end opening of a breather pipe extending from a breather hole opened at the top of the case to the atmosphere through a breather cap attached to the pipe. It functions to suppress the rise in internal pressure due to the rise in temperature inside the tank.

JP 2019-108933 Publication

By the way, the breather pipe of the breather device needs to be opened at a location where the possibility of water exposure is low. For this reason, the breather pipe has a configuration in which the tip opening is opened at a location surrounded by various equipment such as an engine, a radiator, an air cleaner, and an engine mount arranged in an engine room, for example. The opening at the end of this breather pipe should be installed as high as possible from the ground to prevent water splashed up by the wheels from being sucked in. To do this, it is necessary to raise the tip of the breather pipe upward.

However, when the tip of the breather pipe is raised to a high position above, the length of the pipe increases accordingly. Furthermore, if the length of the breather pipe is increased, the breather pipe is likely to vibrate while the vehicle is running, and there is also a risk that the breather pipe and the attachment portion (insertion portion) of the case may be more likely to wear out.

The present invention has been made in view of the above-mentioned problems, and its purpose is to reliably fix the tip of a breather pipe to eliminate problems caused by vibration, and to prevent the tip opening of the breather pipe from being exposed to water. The object of the present invention is to provide a breather structure for a vehicle that can prevent the above.

In order to achieve the above object, the present invention provides a breather pipe (8) that extends from a breather hole (2a) formed in the upper part of the case (2A) by opening the tip opening to the atmosphere. A breather structure for a vehicle that suppresses an increase in internal pressure, wherein an assembly member (10) installed in an upper part of the case (2A) has a tip end side including the tip opening of the breather pipe (8). The leading end portion (8A), which is a part of the breather pipe ( The breather pipe (8) is characterized in that the tip (8A) of the breather pipe (8) is located above the tip opening of the breather pipe (8).

According to the present invention, the tip of the breather pipe is raised upward along the existing assembly member erected at the top of the case, and this tip is attached to the highly rigid assembly member. Vibrations at the tip of the pipe are suppressed, and the problem of oil inside the case flowing out of the case from the opening at the tip of the breather pipe is prevented from occurring. Since the opening at the tip of the pleather pipe opens at a relatively high position from the ground, water splashed up by the wheels is prevented from being sucked into the breather pipe.

Furthermore, the assembly member prevents the opening at the tip of the breather pipe from being exposed to water, and the suction of water into the breather pipe is even more effectively prevented. Note that after the tip of the breather pipe is attached to the assembly member, the assembly member can be attached to the case together with the breather pipe, which improves the ease of assembly.

Here, the tip portion (8A) of the breather pipe (8) may be arranged between the mount portion (5) for attaching the case (2A) to the vehicle body and the assembly member (10). .

According to the above configuration, since the tip of the breather pipe is placed in a position surrounded by the assembly member and the mount, the opening at the tip of the breather pipe is more effectively prevented from being exposed to water by both the assembly member and the mount. is prevented.

Further, another opening (10c) is formed in the assembly member (10) at a position lower than the tip opening of the breather pipe (8), and the other opening (10c) It may be arranged at the rear of the vehicle with respect to the tip (8A) of the breather pipe (8) and on the opposite side to the mount (5).

According to the above configuration, the opening at the distal end of the pleaser pipe is more reliably prevented from being exposed to water by the other openings of the assembly member.

Further, the assembly member (10) includes a bracket part (11) for attaching the breather pipe (8), and the breather pipe (8) has the tip part (8A) and the tip part (8A). The breather pipe (8) includes a horizontal portion (8B) that is continuous with the bracket portion, and a portion of the tip portion (8A) and the horizontal portion (8B) that is substantially parallel to the surface of the bracket portion (11) is connected to the bracket portion. (11). Further, in this case, the tip end (8A) of the breather pipe (8) is fixed to the bracket part (11) by a fixture (12) that is inserted into the insertion holes (11a, 11b) formed in the bracket part (11) and fixed. (11), and the insertion holes (11a, 11b) may be provided at the front of the vehicle.

According to the above configuration, the tip of the breather pipe can be easily attached to the bracket using a fixture with the tip of the breather pipe raised upward. In this case, since the bracket part is provided on a highly rigid assembly member, vibrations at the tip of the breather pipe attached to the bracket part are suppressed.

Moreover, the bracket part (11) is arranged along the breather pipe (8) in a part of the bracket part (11) below the opening part (10c) formed in the assembly member (10). An extending portion (11C) is formed, and the horizontal portion (8B) of the breather pipe (8) is positioned above and adjacent to the extending portion (11C). You may also do so.

According to the above configuration, the extending portion of the bracket portion prevents the assembly hook from going around to the lower side of the horizontal portion continuous to the tip portion of the breather pipe. Therefore, it is possible to prevent problems such as the breather pipe coming off when the assembly hook lifts the breather pipe.
Note that the symbols in parentheses above indicate drawing reference numbers of corresponding components in the embodiments to be described later for reference.

According to the present invention, it is possible to reliably fix the tip of the breather pipe to eliminate problems caused by vibration, and it is also possible to prevent the tip opening of the breather pipe from getting wet.

FIG. 1 is a partial plan view of the interior of an engine room of a vehicle equipped with a breather structure according to the present invention. 2 is an enlarged detailed view of part A in FIG. 1. FIG. 2 is a view in the direction of arrow B in FIG. 1. FIG. FIG. 4 is an enlarged detailed view of section C in FIG. 3; It is a perspective view of an assembly hanger plate and a pipe bracket.

Embodiments of the present invention will be described below based on the accompanying drawings.

1 is a partial plan view of the inside of the engine room of a vehicle equipped with a breather structure according to the present invention, FIG. 2 is an enlarged detailed view of section A in FIG. 1, FIG. 3 is a view in the direction of arrow B in FIG. 1, and FIG. FIG. 5 is an enlarged detailed view of part C of No. 3, and FIG. 5 is a perspective view of the assembly hanger plate and pipe bracket.

As shown in FIG. 1, an engine 1, which is a drive source, is disposed in an engine room at the front of a vehicle, and a transmission 2 is disposed on the left side of the engine 1. Further, a radiator 3 is arranged in front of the engine 1 and the transmission 2 (the upper side in FIG. 1 is the front of the vehicle), and an air cleaner 4 is arranged above the engine 1.

Here, the engine 1 and the transmission 2 are attached to the vehicle body by mount parts 5 (the mount brackets are made of anti-vibration rubber, etc.) on the left and right sides, but the left mount part 5 shown in FIG. )2A is attached to the left end. Although FIG. 1 only shows the left side of the engine room, the left front wheel 7 is supported on the outside of the left mount 5 by a front suspension (hydraulic shock absorber) 6 so as to be movable up and down on the vehicle body. It is located. Although not shown, the right front wheel is also supported by the front suspension so as to be movable up and down on the vehicle body.

By the way, the transmission 2 is provided with a breather device as a ventilation device for suppressing an increase in internal pressure due to a rise in temperature inside the case (transmission case) 2A. The breather pipe 8 is configured by opening the tip end of a breather pipe 8 extending from a circular breather hole 2a (see FIG. 2) formed in the air into the atmosphere.

More specifically, as shown in FIG. 3, a cylindrical boss 2B is integrally protruded from the upper surface of the case 2A of the transmission 2, and a breather hole 2a (see FIG. 2) is formed in this boss 2B. ing. One longitudinal end of a breather pipe 8 is inserted into the breather hole 2a and fixed to the case 2A. As shown in FIGS. 2 and 3, the breather pipe 8 rises upward from the breather hole 2a, is bent at a substantially right angle, extends diagonally forward to the left and substantially horizontally, and then extends at a substantially right angle. It is bent and extends diagonally forward to the right and approximately horizontally. Thereafter, as shown in FIGS. 3 and 4, this breather pipe 8 is bent at a substantially right angle and extends vertically upward, and the tip (state) opening at the tip of the tip that rises upwards has a A breather cap 9 is attached to prevent water from being sucked from the tip opening (hereinafter simply referred to as the opening).

By the way, as shown in FIGS. 2 to 4, an assembly hanger plate (assembly member) 10 is vertically provided on the upper surface of the case 2A of the transmission 2, and the breather pipe 8 is attached to one end of the hanger plate (assembly member) 10. A distal end portion 8A, which is a section, extends toward the hanger plate 10 for assembly. The assembly hanger plate 10 is used to hang the engine 1 and transmission 2 by hooking an assembly hook 20 (for example, see FIG. 4) thereon in a vehicle assembly factory. It is molded into the shape shown. Moreover, this hanger plate 10 for assembly is attached to the upper surface of the case 2A of the transmission 2 from the beginning (at the time of manufacturing the transmission 2), and remains attached to the case 2A even after the assembly is completed. be.

Here, details of the configuration of the hanger plate for assembly 10 will be explained with reference to FIG. It has two vertical parts 10B and 10C vertically standing up from 10A. In this assembly hanger plate 10, the flange portion 10A is attached to the upper surface of the case 2A of the transmission 2, and the vertical portions 10B and 10C stand up substantially vertically in the attached state.

The two vertical parts 10B and 10C of the assembly hanger plate 10 have vertically elongated openings (hook holes) 10a and 10b for hooking the assembly hook 20 (for example, see FIG. 4). , 10c are formed, respectively. Note that the two openings 10a and 10b formed in the higher vertical portion 10B are for hooking an assembly hook when assembling the transmission 2, and the opening 10c formed in the lower vertical portion 10C The assembly hook 20 (see FIG. 4) is hooked onto the assembly hook 20 when the engine 1 is assembled.

Here, the upper part of a pipe bracket 11 formed by bending a steel plate material, for example, is attached by welding to the left side of the vehicle at the bottom of the assembly hanger plate 10. A rectangular mounting portion 11A that is bent at a substantially right angle toward the left side of the vehicle and stands vertically is formed at the top of the pipe bracket 11, and a rectangular insertion hole 11a is formed in this mounting portion 11A. has been done. Further, a horizontal mounting portion 11B is formed at the lower end of the pipe bracket 11 and is bent at a right angle toward the left side of the vehicle, and a rectangular insertion hole 11b is also formed in this mounting portion 11B. . An extension portion 11C extends horizontally and integrally from the mounting portion 11B toward the rear of the vehicle.

The leading end 8A of the pleather pipe 8 extending along the upper surface of the case 2A from the breather hole 2a (see FIG. 2) formed in the upper part of the case 2A of the transmission 2 and the horizontal part 8B connected to the leading end 8A are connected to each other. As shown in FIGS. 2 to 4, the insertion holes 11a and 11b stand up substantially vertically along the pipe bracket 11 and are formed in the mounting portions 11A and 11B of the pipe bracket 11, respectively (see FIG. 5). It is attached to the pipe bracket 11 by a fixture 12 such as a clip inserted into the pipe bracket 11.

By the way, as shown in FIG. 1, the hanger plate 10 for assembly and the pipe bracket 11 attached thereto are placed in a place surrounded by the engine 1, radiator 3, mount part 5, etc. and difficult to be exposed to water. Therefore, the tip 8A of the breather pipe 8, which is attached vertically to the pipe bracket 11, is also placed at a location where it is unlikely to be exposed to water.

Here, when the tip 8A of the breather pipe 8 is attached to the pipe bracket 11 as described above, the opening 10a formed in the assembly hanger plate 10 is located above the tip opening of the breather pipe 8. are doing. The tip portion 8A of the breather pipe 8 is arranged between the mount portion 5 on the left side of the vehicle, the assembly hanger plate 10, and the pipe bracket 11.

As described above, in this embodiment, the tip portion 8A of the breather pipe 8 is moved upwardly along the pipe bracket 11 fixed to the existing assembly hanger plate 10 erected above the case 2A of the transmission 2. Since the tip 8A of the breather pipe 8 is mounted on the pipe bracket 11 fixed to the hanger plate 10 for assembly, the vibration of the tip 8A of the breather pipe 8 is suppressed and the oil in the case 2A is dissipated from the breather pipe. This prevents the problem of the liquid flowing out of the case 2A from the opening at the tip of the case 8. Since the tip opening of the breather pipe 8 opens at a relatively high position from the ground, water splashed up by the front wheels 7 is prevented from being sucked into the breather pipe 8.

Furthermore, the opening at the tip of the breather pipe 8 is prevented from getting wet by the assembly hanger plate 10 and the pipe bracket 11, and the suction of water into the breather pipe 8 is further effectively prevented. Incidentally, if the assembly hanger plate 11 is attached to the case 2A together with the breather pipe 8 after the tip end 8A of the breather pipe 8 is attached to the pipe bracket 11, the ease of assembling these parts is improved.

Furthermore, in the present embodiment, the leading end 8A of the breather pipe 8 is disposed between the mount part 5 for attaching the case 2A to the vehicle body, the assembly hanger plate 10, and the pipe bracket 11, as described above. The distal end 8A of the breather pipe 8 is surrounded by the hanger plate 10 for assembly, the pipe bracket 11 and the mount 5, and the end opening of the breather pipe 8 is further protected from water by the hanger plate 10 for assembly, the pipe bracket 11 and the mount 5. effectively prevented.

Furthermore, in this embodiment, an opening 10c is formed in the hanger plate 10 for assembly at a position lower than the opening at the tip of the breather pipe 8, and this opening 10c is formed with respect to the tip 8A of the breather pipe 8. Since it is located at the rear of the vehicle and on the opposite side to the mount portion 5, the opening 10c of the hanger plate 10 for assembly can further reliably prevent the opening 10c of the hanger plate 10 from getting wet. .

Furthermore, in this embodiment, the pipe bracket 11 is attached to the assembly hanger plate 10, and a fixing device such as a clip is inserted into the insertion holes 10a and 10b formed in the mounting parts 10A and 10B of the pipe bracket 11, respectively. Since the tip 8A and the horizontal portion 8B of the breather pipe 8 are attached to the pipe bracket 11 using the fixing device 12, the tip 8A of the breather pipe 8 can be easily attached to the pipe bracket 11 using the fixture 12. In this case, since the pipe bracket 11 is provided on the highly rigid assembly hanger plate 10, vibration of the tip portion 8A of the breather pipe 8 attached to the pipe bracket 11 is suppressed.

Further, an extending portion 11C extending toward the rear of the vehicle along the breather pipe 8 is formed in a portion of the pipe bracket 11 below the opening 10c formed in the hanger plate 10 for assembly. A horizontal portion 8B connected to the tip portion 8A of the breather pipe 8 is located behind the portion 11C of the vehicle (see FIG. 4), and the horizontal portion 8B of the breather pipe 8 is located above and adjacent to the extending portion 10C. Section 8B is arranged. Therefore, the following effects can be obtained. That is, as shown in FIG. 4, the extension part 11C of the pipe bracket 11 prevents the assembly hook 20 from going around to the lower side of the horizontal part 8B connected to the tip part 8A of the breather pipe 8. 20 lifts the breather pipe 8, thereby preventing problems such as the breather pipe 8 coming off.

Note that the application of the present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims, the technical idea described in the specification, and the drawings.

1 Engine 2 Transmission 2A Transmission case (case)
2a Breather hole 3 Radiator 4 Air cleaner 5 Mount part 6 Front suspension 7 Front wheel 8 Breather pipe 8A Tip of breather pipe 8B Horizontal part of breather pipe 9 Breather cap 10 Assembly hanger plate (assembly member)
10a-10c Opening of hanger plate for assembly 11 Pipe bracket (bracket part)
11A, 11B Pipe bracket mounting part 11a, 11b Pipe bracket insertion hole 12 Fixing tool

Claims (5)

A breather structure for a vehicle that suppresses a pressure increase in the case by opening a tip opening of a breather pipe extending from a breather hole formed in an upper part of the case to the atmosphere,
An assembly member installed in an upper part of the case, which has at least one opening into which an assembly hook of a vehicle assembly factory is hooked, is provided with a distal end side portion of the breather pipe including the distal end opening. The tip part, which is the part, is locked in an upwardly raised state, and
A breather structure for a vehicle, wherein the tip end of the breather pipe is arranged such that at least one of the openings formed in the assembly member is located above the tip opening of the breather pipe. . 2. The vehicle breather structure according to claim 1, wherein the tip end of the breather pipe is disposed between a mount part for attaching the case to the vehicle body and the assembly member. Another opening is formed in the assembly member at a position lower than the tip opening of the breather pipe, and the other opening is rearward of the vehicle with respect to the tip of the breather pipe. 2. The vehicle breather structure according to claim 1, wherein the breather structure is disposed on the opposite side of a mount portion for attaching the case to a vehicle body . The assembly member includes a bracket portion for attaching the breather pipe,
The breather pipe includes the tip and a horizontal portion connected to the tip,
2. The breather structure for a vehicle according to claim 1, wherein the breather pipe is attached to the bracket at a portion of the tip portion and the horizontal portion that is substantially parallel to a surface of the bracket. According to claim 4, the breather pipe is attached to the bracket part by a fixture that is inserted into and fixed to an insertion hole formed in the bracket part, and the insertion hole is provided at the front of the vehicle. Breather structure of the vehicle described.

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