JP2010077883A - Cooling equipment for engine - Google Patents

Abstract

To provide an engine cooling device in which only a pump can be detached from an engine without widening the space around the pump when the return water pipe is a plug-in metal pipe.
In an engine having a plurality of cylinders arranged in a row, a pump 2 attached to the front side of the engine and pumps cooling water to the engine, and cooling water provided at the rear of the engine and flowing through the engine are discharged. The pump side insertion hole 21 opens toward the rear in the cylinder row direction of the engine. The cooling device for the engine includes an outlet member and a metal return pipe 3 that recirculates cooling water from the outlet member to the pump. In addition, the depth direction is a predetermined direction, the outlet member side insertion hole 11 opens toward the front in the cylinder row direction of the engine, and the depth direction is the same as or parallel to the predetermined direction. When removing from the pipe, the return water pipe is made deeper than the insertion amount at the other end of the return water pipe at the normal time so that the return water pipe can be shifted to the outlet member side insertion hole.
[Selection] Figure 2

Description

  The present invention relates to an engine cooling apparatus, and more particularly to a piping structure around a return water pipe.

  As a cooling device for a multi-cylinder engine, a pump unit is arranged at the front part in the cylinder row direction of the engine, the cooling water is pumped into the engine, the cooling water is discharged from the rear part in the cylinder row direction of the engine, and the cooling water is supplied to the pump unit. What circulates cooling water by recirculating | refluxing is known.

  As a structure of the return water pipe for returning the cooling water from the rear part of the engine to the pump unit, for example, one using a rubber hose is well known. However, the rubber hose has a problem that a hose band or the like is required for connection with other components such as a pump unit, and the assembling work is troublesome. In addition, when the return water pipe is located on the exhaust side of the engine, it is necessary to consider the heat resistance when selecting the rubber hose, and there may be restrictions on the available rubber hose.

  Therefore, a pipe using a metal pipe has been proposed as a return water pipe (Patent Document 1). In the case of using a metal pipe, when connecting to other components such as a pump unit, an insertion hole is provided on the other side, and the insertion hole and the metal pipe are sealed with a sealing member such as an O-ring. By adopting, assembly work is simplified. Also, when the return water pipe is located on the exhaust side of the engine, its heat resistance is usually sufficient.

JP-A-2005-233150

  Here, unlike the rubber hose, the metal tube is not very flexible. For this reason, if you want to remove only the pump unit from the engine body for maintenance, etc., the metal pipe will get in the way, and the pump unit will move in the insertion direction by the amount of insertion of the metal pipe into the insertion hole of the pump unit. It is necessary to remove the pump unit from the pipe.

  However, the space around the pump unit is limited in the engine room, and the pump unit may not be moved in the insertion direction by the amount of insertion due to the layout in the engine room. In this case, the pump unit cannot be removed from the engine body unless the structure around the metal pipe is disassembled, and the maintainability is poor. Further, if the space around the pump unit is widened so that the pump unit can be moved in the insertion direction by the amount of insertion, the reduction of the space in the engine room is hindered.

  It is an object of the present invention to provide an engine that can be detached from the engine without removing the space around the pump unit when the insertion method using a metal pipe is adopted as the return channel. It is to provide a cooling device.

  According to the present invention, a pump unit that is attached to one side of a front portion in a cylinder row direction of an engine main body having a plurality of cylinders arranged in a row, and that pumps cooling water to the engine main body, and the engine A cooling water outlet member that is provided at a rear portion of the main body in the cylinder row direction and that discharges the cooling water flowing through the engine main body, connects the cooling water outlet member and the pump unit, and from the cooling water outlet member A metal return water pipe that recirculates the cooling water to the pump unit; a pump side insertion hole provided in the pump unit into which one end of the return water pipe is inserted; and the cooling water outlet member An outlet member side insertion hole into which the other end of the return water pipe is inserted, an inner peripheral surface of the pump side insertion hole, and an outer peripheral surface of the one end of the return water pipe A first seal member interposed therebetween, and a second seal member interposed between an inner peripheral surface of the outlet member side insertion hole and an outer peripheral surface of the other end of the return water pipe. In the engine cooling apparatus, the pump-side insertion hole has an opening end that opens toward a rear portion in the cylinder row direction of the engine body, and a depth direction thereof is a predetermined direction. The insertion hole has an opening end that opens toward the front of the cylinder row direction of the engine body, the depth direction thereof is the same as or parallel to the predetermined direction, and the outlet member side insertion hole is When the pump unit is removed from the engine main body, the return water channel pipe can be shifted to the outlet member side insertion hole side from the insertion amount at the other end of the return water channel pipe at normal time. Also have a long depth Cooling system for an engine according to symptoms is provided.

  In this cooling device, when the pump unit is removed from the engine body, the return water pipe can be shifted to the outlet member side insertion hole side, so that the difference between the return water pipe and the pump side insertion hole is different. The amount of insertion can be shortened, or the return water pipe can be removed from the pump-side insertion hole. Therefore, the amount of movement of the pump unit necessary for removal is reduced, or there is no need to move the pump unit. Therefore, only the pump unit can be removed from the engine without increasing the space around the pump unit to the left.

  In the present invention, the length in the predetermined direction of the return water pipe is L, the separation distance in the predetermined direction between the opening ends of the pump side insertion hole and the outlet member side insertion hole is Ds, The depth of the outlet member side insertion hole is Dpo, and when the engine is mounted on the vehicle, the separation distance in the predetermined direction between the vehicle component and the pump unit located in front of the predetermined direction with respect to the pump unit. Assuming Dc, it is preferable that Dpo> L-Dc-Ds. By satisfying this dimensional relationship, only the pump unit can be removed from the engine without interfering with the vehicle components.

  Further, in the present invention, when the other end of the return water pipe is inserted to the deepest part of the outlet member side insertion hole, the one end of the return water pipe is the pump side difference. It is preferable that it is the state inserted in the insertion hole. According to this configuration, it is possible to prevent the return water pipe from being carelessly dropped from the pump unit.

  In the present invention, the predetermined direction may be a direction parallel to the cylinder row direction, the engine may be mounted horizontally on the vehicle, and the vehicle component may be a front side frame. According to this configuration, it is possible to remove only the pump unit from the engine while adopting a layout in which the front part in the cylinder row direction of the engine body is close to the front side frame.

  In the present invention, the pump unit may be attached to a side portion on the exhaust side of the engine body, and the return water pipe may be disposed below the exhaust manifold of the engine. According to this configuration, since the return water pipe is made of metal, a pipe structure can be constructed on the exhaust side of the engine body without worrying about deterioration of the return water pipe due to exhaust heat.

  As described above, according to the present invention, when the insertion method using the metal pipe is adopted as the return water pipe, only the pump unit is removed from the engine without increasing the space around the pump unit to the left. A removable engine cooling system can be provided.

<First Embodiment>
FIG. 1 is a diagram showing an exhaust side of an engine 100 to which a cooling device A according to an embodiment of the present invention is applied. Although the engine 100 is a four-cycle in-line four-cylinder gasoline reciprocating engine, the present invention is applicable to other types of engines such as other cylinder row arrangements, the number of cylinders, or a diesel type.

  The engine 100 includes an engine body 101. The engine body 101 includes a cylinder block 101a and a cylinder head 101b in which four cylinders are arranged in a row. An exhaust manifold 102 communicating with the exhaust port of each cylinder is connected to the cylinder head 101b. The cooling device A includes a cooling water outlet member 1, a pump unit 2, and a return water pipe 3 connecting them.

  The pump unit 2 is attached to the side of the cylinder block 101a on the exhaust side on the front side in the cylinder row direction by a bolt 4. The pump unit 2 includes a pulley 25. A timing belt (not shown) is wound around the pulley 25 and the pulley 103 connected to the crankshaft (not shown), and the pump unit 2 is driven by the output from the crankshaft. It should be noted that other types of mechanisms can be employed as the power transmission mechanism between the pump unit 2 and the crankshaft. The pump unit 2 may be an electric type equipped with an electric motor.

  The pump unit 2 is driven by the output from the crankshaft and pumps the cooling water into the cylinder block 101a. The pumped cooling water is supplied to a water jacket in the cylinder block 101a and a water jacket in the cylinder head 101b.

  The cooling water outlet member 1 is attached to the rear portion of the cylinder head 101b in the cylinder row direction. At the rear of the cylinder head 101b in the cylinder row direction, there is provided a discharge hole (not shown) for discharging the cooling water flowing through the water jacket in the cylinder head 101b, and the cooling water passage inside the cooling water outlet member 1 is The coolant that has flowed through the engine body 101 is discharged in communication with the discharge hole.

  The cooling water outlet member 1 includes an L-shaped connecting pipe portion 10 connected to the return water pipe 3. The connecting pipe part 10 is made of metal, for example. The cooling water outlet member 1 is also connected to, for example, a water pipe (such as a hose) communicating with a radiator and has a built-in thermostat, and is discharged from the cylinder head 101b when the engine 100 is cold by the valve operation of the thermostat. The cooling water is guided to the return water pipe 3 while the engine 100 is warm, and the cooling water is led to the return water pipe 3 via the radiator.

  The return water channel pipe 3 is a straight cylindrical metal pipe and forms a return water channel for returning the cooling water from the cooling water outlet member 1 to the pump unit 2. The recirculated cooling water is pumped again to the cylinder block 101 a by the pump unit 2, and the cooling water circulates in the engine body 101. The return water pipe 3 passes under the exhaust manifold 102.

  FIG. 2 is a cross-sectional view of the cooling device A along the line XX in FIG. FIG. 2 also schematically shows a planar layout when the engine 100 is arranged in an engine room formed in the front part of the vehicle. The engine 100 is arranged such that its cylinder row direction is parallel to the vehicle width direction, and a front side frame 200 is close to the front portion in the cylinder row direction.

  The pump unit 2 includes a pump-side insertion hole 21 into which one end of the return water pipe 3 is inserted. The pump-side insertion hole 21 has a circular cross-sectional shape and communicates with the vortex chamber 22 in the pump unit 2. An impeller 23 connected to a pulley 25 is disposed in the vortex chamber 22. A discharge path 24 in the pump unit 2 communicates with the vortex chamber 22, and the cooling water recirculated from the return water pipe 3 is pumped from the discharge path 24 to the cylinder block 101 a by the rotation of the impeller 23. become.

  The connecting pipe part 10 includes an outlet member side insertion hole 11 having a circular cross-sectional shape into which the other end of the return water pipe 3 is inserted. Grooves are provided around the outer peripheral surfaces of both ends of the return water pipe 3, and seal members 3 a and 3 b are attached to these grooves, respectively. The seal members 3a and 3b are, for example, O-rings. The seal member 3a is interposed between the inner peripheral surface of the pump-side insertion hole 21 and the outer peripheral surface of the return water pipe 3 and seals between them. Further, the seal member 3b is interposed between the inner peripheral surface of the outlet member side insertion hole 11 and the outer peripheral surface of the return water pipe 3 to seal between them.

  With such a configuration, the connection between the return water pipe 3 and the pump unit 2 and the connection pipe portion 10 is such that each end of the return water pipe 3 is connected to the outlet member side insertion hole 11 and the pump side insertion hole 21. Simply plug each into to complete. Therefore, the assembly work is simplified. In the present embodiment, the sealing members 3a and 3b are provided in the return water pipe 3. However, grooves are provided on the inner peripheral surfaces of the pump side insertion hole 21 and the outlet member side insertion hole 11. By doing so, it is good also as a structure provided in the pump side insertion hole 21 and the outlet member side insertion hole 11. FIG.

  Next, in the case of this embodiment, the outlet member side insertion hole 11 and the pump side insertion hole 21 both have the same imaginary straight line parallel to the cylinder row direction as their central axis. That is, the depth direction is the same direction, which is parallel to the cylinder row direction.

  The outlet member side insertion hole 11 has an opening end 11a that opens toward the front in the cylinder row direction, and the pump side insertion hole 21 has an opening end 21a that opens toward the rear in the cylinder row direction. These open ends 11a and 21a face each other, and the separation distance in the cylinder row direction is Ds.

  The outlet member side insertion hole 11 has a depth Dpo, and the pump side insertion hole 21 has a depth Dpw. Both of these depths Dpo and Dpw are the lengths from the open ends 11a and 21a to the deepest part into which the return water pipe 3 can be inserted.

  The return water pipe 3 has a length L in the cylinder row direction. In the case of this embodiment, since the return water pipe 3 is linear, the length L in the cylinder row direction is the entire length. The insertion amount Dio is the insertion amount with respect to the outlet member side insertion hole 11 at the end of the return water pipe 3, and the insertion amount Diw is with respect to the pump side insertion hole 21 at the end of the return water pipe 3. The amount of insertion is shown, and is the length from the open ends 11a and 21a to the end face of the return water pipe 3.

  The insertion amounts Dio and Diw at the normal time (when the engine 100 is used) are the lengths required to support the return water channel pipe 3 by the outlet member side insertion hole 11 and the pump side insertion hole 21. Say it. FIG. 2 shows a normal insertion state. In the case of the present embodiment, the end of the return water pipe 3 is the deepest of the pump side insertion hole 21 with respect to the pump side insertion hole 21. It is inserted to the part. On the other hand, the end of the return water pipe 3 is not inserted into the outlet member side insertion hole 11 up to the deepest part of the outlet member side insertion hole 11, but is further inserted (depth Dpo−difference). Loading amount Diw).

  Now, when the pump unit 2 is removed from the engine 100 from the state of FIG. 2, it can be removed from the cylinder block 101a by removing the bolt 4 (see FIG. 1), but the end of the return water pipe 3 is still inserted. In order to be separated from the return water pipe 3, the pump unit 2 must be moved forward in the cylinder row direction by the insertion amount Diw.

  However, the front side frame 200 is located in front of the pump unit 2 in the cylinder row direction, and the separation distance in the cylinder row direction from the pump unit 2 is Dc (<insertion amount Diw), which interferes.

  In the present embodiment, as described above, the end of the return water pipe 3 is inserted into the outlet member side insertion hole 11 up to the deepest portion of the outlet member side insertion hole 11 in the normal state of FIG. There is a margin for insertion (depth Dpo−insertion amount Diw). Therefore, the amount of movement for separating the pump unit 2 from the return water pipe 3 can be reduced by further inserting and shifting the return water pipe 3 into the outlet member side insertion hole 11 by this amount. That is, the depth Dpo of the outlet member side insertion hole 11 is set so that when the pump unit 2 is removed from the engine body, the return water pipe 3 can be shifted to the outlet member side insertion hole 11 side. A depth longer than the insertion amount Dio at the end of the pipe for water channel 3 is set.

  FIG. 3 is a view showing a mode in which the return water pipe 3 is shifted from the normal position shown in FIG. 2 to the outlet member side insertion hole 11 side. In particular, the end of the return water pipe 3 is connected to the outlet member side. The state inserted to the deepest part of the insertion hole 11 is shown. In the aspect of FIG. 3, the insertion amount Diw is reduced by the amount of shifting of the return water channel pipe 3, and the separation distance Dc is larger than the insertion amount Diw. Therefore, the pump unit 2 can be removed without interfering with the front side frame 200.

  As described above, in this embodiment, since the amount of movement of the pump unit 2 necessary for removal is small, only the pump unit 2 can be detached from the engine 100 without increasing the space around the pump unit 2 to the left. . 2 and 3, only the pump unit 2 can be detached from the engine 100 while adopting a layout in which the front of the engine body 101 in the cylinder row direction is close to the front side frame 200.

  Here, the requirement for removing the pump unit 2 without interfering with the front side frame 200 is Dpo> L-Dc-Ds. By satisfying this dimensional relationship, only the pump unit 2 can be removed from the engine 100 without interfering with the front side frame 200. In the present embodiment, the front side frame 200 is described as an example of a vehicle component that interferes with the pump unit 2 when the pump unit 2 is removed. However, the present invention is not limited to this, and the front side frame 200 may interfere when the pump unit 2 is removed. It goes without saying that the dimensional relationship can be set in relation to other vehicle components.

  Next, when the return water pipe 3 is shifted from the normal position to the outlet member side insertion hole 11 side, the depth Dpo is set so that the return water pipe 3 exits from the pump side insertion hole 21. Good. In this case, the amount of movement of the pump unit 2 necessary for removal in the cylinder row direction becomes zero. However, in that case, there is a concern that the return water pipe 3 may accidentally fall out of the pump unit 2. Therefore, as shown in FIG. 3, when the end of the return water pipe 3 is inserted to the deepest part of the outlet member side insertion hole 11, the return water pipe 3 of the return side water pipe 3 is inserted into the pump side insertion hole 21. It is desirable that the end is inserted. The necessary dimensional relationship for this is Dpo <L-Ds. In this case, since it is desirable that the seal by the seal member 3a functions between the pump side insertion hole 21 and the return water pipe 3, the length from the end surface of the return water pipe 3 to the seal member 3a is longer. Assuming that D (including the width of the seal member 3a) is D, the dimensional relationship is preferably Dpo <L−Ds−D.

  In the present embodiment, the pump unit 2 and the return water pipe 3 are provided on the exhaust side of the engine body 101, but may be provided on the intake side. However, in the present embodiment, since the return water pipe 3 is made of metal, a pipe structure that does not cause deterioration of the return water pipe 3 due to exhaust heat can be constructed on the exhaust side of the engine body 101. Further, since the return water passage pipe 3 passes below the exhaust manifold 102, the return water passage pipe 3 can be disposed avoiding interference with the exhaust manifold 102.

<Second Embodiment>
In the said 1st Embodiment, although the linear thing was utilized as the piping 3 for return channels, it may be bent in the middle. In addition, although the depth direction of the outlet member side insertion hole 11 and the pump side insertion hole 21 is the same direction and parallel to the cylinder row direction, these may not be the same direction and may be parallel. It is sufficient if it is not parallel to the cylinder row direction.

  FIG. 4 is a diagram showing an exhaust-side side portion of engine 100 to which cooling device B according to another embodiment of the present invention is applied. The same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted, and only different components are described.

  In the case of the present embodiment, the return water pipe 3 ′ instead of the return water pipe 3 is a cylindrical metal pipe bent in the middle. In FIG. 4, the depth direction d1 indicates the depth direction of the insertion hole of the pump unit 2 ′ instead of the pump unit 2, and the opening end 21a ′ is the opening end of the insertion hole of the pump unit 2 ′. Moreover, the depth direction d2 shows the depth direction of the insertion hole of connecting pipe part 10 'replaced with the connecting pipe part 10, and opening end 11a' is an opening end of the insertion hole of connecting pipe part 10 '. Although the depth direction d1 and the depth direction d2 are parallel to each other, they are not in the same direction (not on the same straight line).

  Even in such a configuration, when the pump unit 2 ′ is removed by shifting the return channel 3 ′ in the direction of the depth direction d1 (in other words, the direction of the depth direction d2), the return channel The amount of movement in the depth direction d1 for separating from 3 ′ can be eliminated or reduced. Therefore, it is possible to avoid only the pump unit 2 ′ from the engine 100 while avoiding interference with vehicle components located in the front of the pump unit 2 ′ in the depth direction d <b> 1.

  In the case of this embodiment, in the above dimensional relationship, as shown in FIG. 4, the length L of the return water pipe 3 is the length in the depth direction d1 (that is, the direction of the depth direction d2). , Not its full length. Further, the separation distance Ds between the opening ends 11a ′ and 21a ′ is also the separation distance in the depth direction d1 (in other words, the direction in the depth direction d2).

It is a figure which shows the side part by the side of the exhaust_gas | exhaustion of the engine 100 to which the cooling device A which concerns on one Embodiment of this invention is applied. It is sectional drawing of the cooling device A along line XX of FIG. It is a figure which shows the aspect which shifted the piping 3 for return water channels from the normal position. It is a figure which shows the side part by the side of the exhaust_gas | exhaustion of the engine 100 to which the cooling device B which concerns on other embodiment of this invention is applied.

Explanation of symbols

A Cooling device 1 Cooling water outlet member 2 Pump unit 3 Return water pipes 3a and 3b Seal member 11 Outlet member side insertion hole 11a Open end 21 Pump side insertion hole 21a Open end 100 Engine 101 Engine body

Claims (5)

A pump unit that is attached to one side of the front part in the cylinder row direction of the engine body having a plurality of cylinders arranged in a row, and pumps cooling water to the engine body;
A cooling water outlet member provided at a rear portion in the cylinder row direction of the engine body and from which the cooling water flowing through the engine body is discharged;
A metal return pipe for connecting the cooling water outlet member and the pump unit, and returning the cooling water from the cooling water outlet member to the pump unit;
A pump-side insertion hole provided in the pump unit, into which one end of the return water pipe is inserted;
An outlet member side insertion hole provided in the cooling water outlet member, into which the other end of the return water pipe is inserted;
A first seal member interposed between an inner peripheral surface of the pump-side insertion hole and an outer peripheral surface of the one end of the return water pipe;
A second seal member interposed between an inner peripheral surface of the outlet member side insertion hole and an outer peripheral surface of the other end of the return water pipe;
In the engine cooling device with
The pump side insertion hole is
The engine body has an opening end that opens toward the rear of the cylinder row direction of the engine body, and the depth direction is a predetermined direction,
The outlet member side insertion hole is
And having an opening end that opens toward the front of the cylinder row direction of the engine body, and the depth direction thereof is the same as or parallel to the predetermined direction,
The outlet member side insertion hole is
When the pump unit is removed from the engine main body, the return water channel pipe can be shifted to the outlet member side insertion hole side from the insertion amount at the other end of the return water channel pipe at normal time. An engine cooling device characterized by having a long depth. The length in the predetermined direction of the return water pipe is L,
The distance in the predetermined direction between the opening ends of the pump side insertion hole and the outlet member side insertion hole is Ds,
The depth of the outlet member side insertion hole is Dpo,
When the engine is mounted on a vehicle, the distance in the predetermined direction between the vehicle component and the pump unit located in front of the predetermined direction with respect to the pump unit is Dc,
Then,
Dpo> L-Dc-Ds
The engine cooling device according to claim 1, wherein   When the other end of the return water pipe is inserted to the deepest part of the outlet member side insertion hole, the one end of the return water pipe is inserted into the pump side insertion hole. The engine cooling device according to claim 1 or 2, wherein The predetermined direction is a direction parallel to the cylinder row direction;
The engine is mounted horizontally on the vehicle;
The engine cooling device according to claim 2, wherein the vehicle component is a front side frame. The pump unit is attached to an exhaust side of the engine body;
The engine cooling device according to any one of claims 1 to 4, wherein the return water pipe is disposed below an exhaust manifold of the engine.

Images