JPH0561410U - Engine oil pan structure - Google Patents

Abstract

(57) [Summary] [Purpose] Prevents oil from adhering to the sound absorbing material during oil change and suppresses oil pump noise. [Structure] In a structure in which a sound absorbing material 7 is disposed below an oil pan 2, the lower surface of a bottom plate portion 2a of the oil pan is exposed to the outside without being covered with the sound absorbing material. The drain plug 4 is attached at a substantially central position of the bottom plate portion. Then, a reinforcing portion 9 having higher rigidity than the other parts is formed at this central position, and the oil strainer 3 is arranged so as to face the reinforcing portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of an engine oil pan.

[0002]

[Prior Art]

 Generally, an engine oil pan includes an oil strainer disposed inside the engine, and a drain plug mounted on a bottom plate portion of the oil pan. As an oil pan of this type, it is known that an oil strainer is arranged at almost the center of the bottom plate so as to face each other, and a drain plug is arranged at a side end corner of the bottom plate apart from the oil strainer. (See, for example, Japanese Utility Model Laid-Open No. 61-97510). Further, as a structure of such a drain plug mounting portion, there is known a structure in which a drain nut is fitted into a hole formed in the bottom plate portion and welded (see, for example, Japanese Utility Model Laid-Open No. 60-39715).

[0003]

[Problems to be solved by the device]

 By the way, in recent years, in order to reduce engine noise, a sound absorbing material has been arranged below the oil pan. In this case, the central portion of the lower surface of the bottom plate portion is exposed to the outside by removing the sound absorbing material in order to obtain a cooling effect by applying traveling wind, but the other bottom plate portions are exposed by the sound absorbing material. Is covered. Therefore, since the lower surface side of the drain plug in the conventional oil pan is covered with the sound absorbing material or the edge of the sound absorbing material is located near the lower side of the drain plug, the drain plug is removed. When the oil is changed by means of oil replacement, the scattered oil may adhere to the sound absorbing material. If this oil adheres to the sound absorbing material, it may deteriorate the sound absorbing material.

Further, since the oil strainer faces the substantially central portion of the bottom plate portion of the oil pan, the vibration caused by the discharge pulsation of the oil pump is transmitted to the bottom plate portion via the oil strainer. There is an inconvenience that noise is likely to be generated by vibrating the bottom plate.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent the oil from adhering to the sound absorbing material at the time of oil exchange and to cause the discharge pulsation of the oil pump. This is to suppress the generation of oil pump noise.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the invention according to claim 1 is premised on that a sound absorbing material is arranged in a lower portion of an oil pan, and a lower surface side of a bottom plate portion of the oil pan is covered with the sound absorbing material. Without exposing it to the outside. Then, the drain plug is attached to the center of the bottom plate.

Further, the invention according to claim 2 is the device according to claim 1, wherein a reinforcing portion having a rigidity higher than that of other portions of the bottom plate portion is provided at a substantially central position of the bottom plate portion on which the drain plug is mounted. To form. The oil strainer is arranged inside the oil pan so as to face the reinforcing portion.

[0008]

[Action]

 With the above structure, in the device according to the first aspect, the drain plug is attached to substantially the center of the bottom plate portion of the oil pan, and the lower surface side of the bottom plate portion is not covered with the sound absorbing material and is exposed to the outside. When removing the drain plug and changing the oil, the oil does not adhere to the sound absorbing material.

According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the vibration caused by the discharge pulsation of the oil pump from the oil strainer causes the vibration of the bottom plate portion facing the oil strainer. Even if it is transmitted to almost the center, the vibration of the bottom plate is suppressed because the reinforcement having higher rigidity than the other parts is formed in this center.

[0010]

【Example】

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

1 to 4 show an oil pan structure according to an embodiment of the present invention, 1 is an engine, 2 is an oil pan arranged at the bottom of the engine 1, and 3 is an oil pan 2 The oil strainers 4 are disposed in the interior of the oil pan 4, and are drain plugs attached to the bottom plate portion 2a of the oil pan 2.

The engine 1 is composed of a cylinder block 5 and the oil pan 2 integrally attached to the lower side of the cylinder block 5 and the like, and is supported by the vehicle body via a mount member (not shown) and the like. .. The underside of the engine 1 is covered with an undercover 6 attached to the vehicle body such as a front frame, so that the aerodynamic performance is improved by rectifying the underside of the engine and protection from stone bounce is achieved. A portion of the under cover 6 facing the oil pan 2 is opened, the bottom plate portion 2a of the oil pan 2 is exposed downward from the opening 6a, and is guided to the bottom plate portion 2a by the under cover 6. It is designed to be exposed to the running wind. An annular sound absorbing material 7 is arranged between the opening 6a and the oil pan 2, and the sound absorbing material 7 covers the periphery of the bottom plate 2a, and together with the under cover 6 of the engine 1. The driving sound is prevented from leaking to the outside and being transmitted to the passenger compartment. That is, the bottom plate portion 2a of the oil pan 2 is not covered with the under cover 6 and the sound absorbing material 7, and is exposed downward from the opening surrounded by the inner peripheral edge 7a of the sound absorbing material 7. There is.

An oil (not shown) for lubrication is stored in the oil pan 2, and this oil is sucked up through the oil strainer 3 by the drive of an oil pump (not shown), and the inside of the cylinder block 5 and the like. Is supplied to the oil pan 2 to lubricate the respective parts in the engine 1, and then flows down into the oil pan 2 to be circulated again. The oil strainer 3 is immersed in the oil stored in the oil pan 2 and is arranged so as to face substantially the center of the bottom plate portion 2 a of the oil pan 2.

Further, as shown in detail in FIG. 5, a hole 2b penetrating the bottom plate portion 2a is formed substantially in the center of the bottom plate portion 2a of the oil pan 2, and the hole 2b is provided with a collar. The drain nut 8 of is fixed. The drain nut 8 is composed of a tubular portion 8a having a thread groove formed on the inner peripheral surface thereof and a flange portion 8b integrally formed on the upper end side of the tubular portion 8a. The tubular portion 8a is provided inside the oil pan 2. The outer periphery of the collar portion 8b is welded to the inner surface of the bottom plate portion 2a in a state where the collar portion 8b is fitted into the hole 2b and the collar portion 8b is in contact with the inner surface of the bottom plate portion 2a. The drain nut 8 is welded to the central portion of the bottom plate portion 2a, so that the reinforcing portion 9 having higher rigidity than the other portions of the bottom plate portion 2a is formed in the central portion. The drain plug 4 is detachably attached to the cylindrical portion 8a of the drain nut 8 by screwing the drain plug 4 from the lower side to the upper side via the seal washer 4a.

Next, to explain the operation and effect of the above-described embodiment, when draining the drain plug 4 to discharge old oil, the drain plug 4 is positioned substantially at the center of the bottom plate portion 2 a of the oil pan 2. In addition, since the bottom surface of the bottom plate 2a is exposed to the outside, that is, not covered with the sound absorbing material 7, the discharge oil is surely prevented from adhering to the sound absorbing material 7. be able to. Moreover, since the oil exchange work can be performed without worrying about the oil adhering to the sound absorbing material 7, the work can be easily performed.

Further, a drain nut 8 for mounting the drain plug 4 can form a reinforcing portion 9 having higher rigidity than other portions at the central portion of the bottom plate portion 2a, and the oil strainer 3 is Since the reinforcing portion 9 is disposed immediately below, even if the discharge pulsation of the oil pump is transmitted to the bottom plate portion 2a via the oil strainer 3 and the stored oil in the oil pan 2, It is possible to reduce and suppress the generation of noise in the bottom plate portion 2a as compared with the case where the reinforcing portion 9 is not formed.

It should be noted that the present invention is not limited to the above-described embodiment, but includes various other modified examples. That is, in the above-described embodiment, the reinforcing portion 9 formed in the substantially central portion of the bottom plate portion 2a is formed by welding the drain nut 8; however, the present invention is not limited to this. For example, a reinforcing plate member may be a bottom plate portion. The bottom plate 2a may be overlapped and welded with the bottom plate 2a, or the central portion of the bottom plate 2a may be thicker than other portions.

Further, in the above embodiment, the collar portion 8b of the drain nut 8 is arranged and fixed on the inner surface side of the bottom plate portion 2a, but the present invention is not limited to this, and as shown in FIG. The collar portion 8b of the nut 8 may be arranged on the outer surface side of the bottom plate portion 2a, and the collar portion 8b may be welded to the outer surface of the bottom plate portion 2a.

The drain plug 4 according to the present invention need not be mounted at the exact center position of the bottom plate portion 2a of the oil pan 2, but may be located in the vicinity of the exact center position. That is, the drain plug 4 can prevent the oil from adhering to the inner peripheral edge 7a of the sound absorbing material 7 located around the bottom plate portion 2a during oil exchange. It suffices if it is installed at the "almost central position".

[0020]

[Effect of the device]

 As described above, according to the engine oil pan structure of the invention as set forth in claim 1, the drain plug is attached to substantially the center position of the bottom plate portion of the oil pan, and the lower surface side of the bottom plate portion is provided with the sound absorbing material. Since the oil is exposed without being covered with, it is possible to reliably prevent the oil from adhering to the sound absorbing material when changing the oil, and to easily perform the oil changing work.

According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the oil strainer is arranged so as to face the drain plug at the center of the bottom plate. In addition, since a reinforcing portion having higher rigidity than other portions is formed at the center position of the bottom plate portion, it is possible to suppress the generation of oil pump noise caused by the discharge pulsation of the oil pump transmitted through the oil strainer. You can

[Brief description of drawings]

FIG. 1 is a side view of an engine to which an embodiment of the present invention is applied.

FIG. 2 is an enlarged side view in which a part of the above embodiment is cut away.

FIG. 3 is an enlarged front view in which a part of the above embodiment is cut away.

FIG. 4 is an enlarged bottom view of the above embodiment.

FIG. 5 is an enlarged sectional view of a mounting portion of the drain plug.

FIG. 6 is an enlarged cross-sectional view showing another aspect of the mounting portion of the drain plug.

[Explanation of symbols]

 1 Engine 2 Oil Pan 2a Bottom Plate 3 Oil Strainer 4 Drain Plug 7 Sound Absorbing Material 9 Reinforcement

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Mitsuki Hanada 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Motor Corporation

Claims (2)

[Scope of utility model registration request] 1. In an oil pan structure of an engine in which a sound absorbing material is arranged below an oil pan, the lower surface side of a bottom plate constituting a lower surface of the oil pan is exposed to the outside without the sound absorbing material. , An oil pan structure for an engine, in which a drain plug is attached at a substantially central position of the bottom plate portion. 2. A reinforcing portion having higher rigidity than other portions of the bottom plate portion is formed at a substantially central position of the bottom plate portion of the oil pan, and an oil strainer is disposed inside the oil pan so as to face the reinforcing portion. The oil pan structure for an engine according to claim 1, wherein