JP2015190447A - Internal combustion engine pump unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water pump capable of preventing foreign matters from entering a mechanical seal.SOLUTION: A water pump 9 comprises: a pump housing 20; a cover housing 22; and a rotary shaft 25, and an impeller 26 is fixed to one end of the rotary shaft 25. The rotary shaft 25 is pivotally supported by a bearing 24 and water-sealed by a mechanical seal 27. A cylindrical partition part 31 facing the mechanical seal 27 is formed on a back surface of the impeller 26, and the partition part 31 prevents foreign matters from being attracted toward the mechanical seal 27. If a fin 32 or a spiral stripe 33 is provided on the partition part 31 to provide a vane structure (pump structure), a function to eliminate foreign matters further improves.

Description

  The present invention relates to a pump device used in an internal combustion engine.

  In an internal combustion engine, a water pump is used as a cooling water pumping means. In this water pump, an impeller is provided at one end of a rotating shaft rotatably held in a housing by a bearing. When the impeller rotates, cooling water flows into the pump chamber from the axial direction and is discharged in a tangential direction.

  The housing has a central hole concentric with the rotating shaft to place the bearing, and in order to prevent cooling water from reaching the bearing from this central hole, the center hole is closer to the impeller than the bearing. The mechanical seal is arrange | positioned and the example is disclosed by patent document 1, for example. In Patent Document 1, the mechanical seal is arranged close to the end of the center hole (close to the impeller).

Japanese Utility Model No. 61-159698 microfilm

  Now, the mechanical seal exhibits a high liquid sealing effect, but if the foreign matter is bitten, the sealing effect is lowered, and then the cooling water may reach the bearing and cause troubles such as corrosion and water leakage. Therefore, apart from the reliability of the mechanical seal, it is necessary to prevent foreign matter from reaching the mechanical seal as much as possible.

  In particular, when the length of the rotating shaft is long and bending is likely to occur, foreign matter can easily enter the mechanical seal, so the need for measures to prevent foreign matter from entering increases. However, in the prior art including Patent Document 1, no consideration has been given to such countermeasures against foreign matter.

  The present invention has been made in view of the present situation, and aims to ensure the function of the sealing material by preventing foreign matter from entering a sealing member such as a mechanical seal.

  The configurations of the present invention are diverse, and typical examples are specified in each claim. Of these, the invention of claim 1 includes a rotating shaft having one end exposed in the pump chamber, and a housing in which the rotating shaft is rotatably held by a bearing. In a basic configuration in which an impeller is provided and a seal member is provided between the bearing and the impeller, foreign matter enters from the impeller side to the bearing side between the bearing and the impeller. The partition part which prevents that is provided.

  According to a second aspect of the present invention, there is provided a preferred embodiment of the first aspect. In the present invention, the partition portion is provided integrally with the rotating shaft, and the partition portion is configured to rotate the fluid. It has a blade structure that pushes from the seal member side to the impeller side.

  According to a third aspect of the present invention, in the same basic configuration as that of the first aspect, the impeller is provided with a partition portion that prevents foreign matter from entering from the impeller side to the bearing side.

  According to a fourth aspect of the present invention, in the third aspect, the partition portion has a blade structure that pushes the fluid from the seal member side to the pump chamber side by rotation. In addition, “pushing to the pump chamber side” in claim 4 is synonymous with “sucking from the seal member side”.

  According to the present application, in any of the inventions, even if the foreign matter rides on the fluid and enters (or attempts to enter) the seal member from the pump chamber, the partition portion can prevent the foreign matter from reaching the seal member. . Therefore, the function of the sealing member is ensured to ensure a high liquid sealing effect, and it is possible to prevent the bearing from getting wet and causing troubles such as corrosion and liquid leakage.

  If the partition part is provided between the rotating shaft and the impeller as in claims 1 and 2, there is an advantage that the structure is simplified. In claim 1, the partition portion can be provided on either of the rotating shaft and the housing. However, if the rotating shaft is provided on the rotating shaft as in claim 2 and has a blade structure, the foreign matter is positively pumped. Since it can push to the chamber side, there exists an advantage which can prevent more reliably that a foreign material reaches a sealing member.

  In addition, when the partition portion is provided on the impeller as in claim 3, it can be said that the entrance of the foreign matter can be prevented at a portion close to the pump chamber, and therefore, a high prevention effect against the entrance of the foreign matter can be exhibited (with the rotation of the impeller). Since the fluid swirls while receiving centrifugal force at the partition portion, the foreign matter is also discharged into the pump chamber along with the fluid flow). In particular, it is preferable that the partition portion has a blade function as in claim 4 because foreign matters can be reliably removed.

It is a schematic front view of an internal combustion engine. It is a perspective view of a front cover. (A) is the III-III sectional view taken on the line of FIG. 1, ((B) (C) is the partial side view of a modification. It is a figure which shows 2nd Embodiment and is sectional drawing similar to FIG. It is a figure which shows 3rd Embodiment and is sectional drawing similar to FIG.

(1). Outline of Internal Combustion Engine Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a water pump of an internal combustion engine. The basic configuration of the internal combustion engine is the same as the conventional one, and as main elements of the engine body, a cylinder block 1 and a cylinder head 2 fixed to the upper surface thereof, and a front cover fixed to one end face thereof by a large number of bolts. (Chain cover, chain case) 3 is provided. A head cover 4 is fixed to the upper surface of the cylinder head 2, and an oil pan 5 is fixed to the lower surface of the cylinder block 1.

  One end of the crankshaft 6 protrudes outside the front cover 3, while a motor generator (ISG) 7 is disposed on the left side of the engine body in a front view, and an air conditioner compressor 8 is disposed on the right side. Yes. In addition, a water pump 9 is disposed in the front cover 3 at an approximately vertical middle portion and on the left side.

  The motor generator 7, the air conditioner compressor 8, and the water pump 9 include pulleys 10, 11, and 12 that are fixed to the rotation shaft, respectively, and the first belt 14 is connected to the pulley 10 and the first crank pulley 13 of the motor generator 7. Is wound around the pulley 11 and the second crank pulley 15 of the compressor 8 for the air conditioner, and the third belt 18 is wound around the pulley 12 and the third crank pulley 17 of the water pump 9. It is wrapped around.

  The three belts 14, 16, and 18 are arranged so that the first belt 14 is closest to the front cover 3 and the third belt 18 is farthest from the front cover 3. Therefore, the pulley 12 of the water pump 9 has a larger projecting dimension from the front cover 3 than the case where each auxiliary machine is driven by a single belt. The front cover 3 also serves as a pump housing for the water pump 9. Therefore, as shown in FIG. 2, the pump housing 20 of the water pump 9 is integrated with the front cover 3, and a pump chamber (spiral chamber) 21 is vacant in the pump housing 20.

(2) Structure of water pump Next, the structure of the water pump 9 will be described. First, the first embodiment shown in FIG. 3 will be described. The water pump 9 includes a pump housing 20 having a pump chamber 21 and a cover housing 22 fixed to the pump housing 20. The cover housing 22 has a center hole 23 parallel to the crankshaft 6, and a rotation shaft 25 is rotatably held in the center hole 23 via a bearing 24.

  One end of the rotating shaft 25 is exposed to the pump chamber 21, and the impeller 26 is fixed to this one end. On the other hand, the other end portion of the rotating shaft 25 protrudes outside the cover housing 22, and the pulley 12 is fixed to the other end portion. The pulley 12 has a bowl-like shape so as to cover the front end portion of the cover housing 22.

  The bearing 24 is provided on the side close to the pulley 12 in the center hole 23, and a mechanical seal 27 as an example of a seal member is disposed in a part close to the pump chamber 21 in the center hole 23. Cooling water flows into the pump chamber 21 through an inlet 28 provided in the cylinder block 1. The pump housing 20 is provided with a discharge port 29, and the discharge port 29 communicates with a main gallery 30 provided in the cylinder block 1.

  The impeller 26 is integrally provided with a cylindrical partition portion 31 facing the center hole 23 (may be manufactured by a separate member and then fixed by welding or the like). Since the partition portion 31 rotates integrally with the impeller 26, a water flow that rotates with the partition portion 31 is generated outside the outer periphery of the partition portion 31. And the site | part enclosed by the partition part 31 becomes a dead end, and a water flow does not flow in, but a water flow seeks the escape place and goes to the discharge outlet 29. FIG.

  Therefore, even if foreign matter such as granules is mixed in the cooling water, the foreign matter rides on the water flow and is discharged to the discharge port 29 and does not go to the mechanical seal 27. As a result, it is possible to prevent the foreign matter from being bitten into the mechanical seal 27 and reducing the water sealing function.

  In the present embodiment, as described above, since the three auxiliary machines are driven separately, the pulley 12 of the water pump 9 having the smallest load is the farthest from the front cover 3, and accordingly, The shaft 25 is longer than before. For this reason, the rotating shaft 25 is easily bent, and a gap is easily formed in the mechanical seal 27. However, since the partition part 31 can prevent foreign matter from reaching the mechanical seal 27, the water of the mechanical seal 27 can be prevented. The sealing function is not deteriorated, and the cooling water can be accurately prevented from reaching the bearing 24.

  In FIG. 3A, the partition portion 31 has a simple cylindrical structure. However, the partition portion 31 can also have a blade function (or a pump function) that positively pushes cooling water back. As an example, in FIG. 3B, a large number of fins (or ribs) 32 that are inclined (twisted) with respect to the axis are provided on the outer periphery of the partition portion 31.

  On the other hand, in the example shown in FIG. 3C, a spiral 33 is provided on the outer periphery of the partition portion 31. In addition, the partition portion 31 may be configured by a large number of plates arranged in the circumferential direction and each plate may be slightly twisted when viewed from the axial direction. It can have a blade function.

  In the second embodiment shown in FIG. 4, the partition portion 31 is formed in a ring plate shape and is fixed to the rotating shaft 25. In place of or in addition to providing the partition portion 31 on the rotary shaft 25, as shown by a one-dot chain line in FIG. 4, a ring plate-shaped partition portion 31 can be attached to the center hole 23. A plurality of these ring-plate-shaped partition portions 31 can be provided in the rotating shaft 25 or the center hole 23.

  In the third embodiment shown in FIG. 5, when the partition portion 31 is provided on the rotating shaft 25, the partition portion 31 is cooled by providing the fin portion 34 at a portion facing the pump chamber 21 in the partition portion 31. A blade function for pushing water toward the pump chamber 21 is provided.

  The embodiment of the present invention has been described above, but the present invention can be embodied in various ways. For example, a plurality of fan-like blade pieces may be provided on the outer peripheral surface of the rotating shaft as a partitioning portion, and a water flow toward the pump chamber may be formed by pushing out the blade pieces. The present invention can be applied not only to a water pump but also to an oil pump. The rotating shaft may be driven by a motor.

  The present invention can be embodied in a pump device such as a water pump. Therefore, it can be used industrially.

9 Water pump 12 Water pump pulley 20 Pump housing 21 Pump chamber (vortex chamber)
DESCRIPTION OF SYMBOLS 22 Cover housing 23 Center hole 24 Bearing 25 Rotating shaft 26 Impeller 27 Mechanical seal as an example of a sealing member 31 Partition part 32, 34 Fin (rib) as element of blade structure
33 Spiral strips as an element of blade structure

Claims (4)

A rotating shaft having one end portion exposed to the pump chamber, and a housing in which the rotating shaft is rotatably held by a bearing; an impeller is provided at one end portion of the rotating shaft; and A seal member is provided between the bearing and the impeller,
A partition is provided between the bearing and the impeller to prevent foreign matter from entering from the impeller side to the bearing side.
A pump device for an internal combustion engine. The partition portion is provided integrally with the rotating shaft, and the partition portion has a blade structure that pushes fluid from the seal member side to the impeller side by rotation.
A pump device for an internal combustion engine according to claim 1. A rotating shaft having one end portion exposed to the pump chamber; and a housing that is rotatably held by the rotating shaft by a bearing. An impeller is provided at one end portion of the rotating shaft, and the bearing And a structure in which a seal member is provided between the impeller and the impeller,
The impeller is provided with a partition portion that prevents foreign matter from entering from the impeller side to the bearing side,
A pump device for an internal combustion engine. The partition portion has a blade structure that pushes fluid from the seal member side to the pump chamber side by rotation,
The pump device for an internal combustion engine according to claim 3.

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