JPS6093114A - Cooler for water-cooled engine - Google Patents

Abstract

PURPOSE:To shorten warming-up time by providing a clutch disengaged in low temperature between an impeller of a water pump and a drive shaft driven rotatably by power transmission from an engine. CONSTITUTION:A drive gear 20 meshing with a gear at the crankshaft side is mounted on an end of a drive shaft 19 adjacent to the inside of a crank case. And the other end is introduced into a pump chamber, and on the outer periphery of this introducing portion is mounted relatively rotatably a boss portion 22 of a water pump impeller 21. In an end of a guide hole 24 provided at the impeller 21 side of the drive shaft 19 is enclosed temperature sensitive wax 31 through a cap 29 so that a slider 25 is moved to the drive gear 25 side in response to the rise of water temperature. Thus, the tapered surface 26 of the end of the slider 25 pushes a ball 28 to the outer peripheral side so that the rotation of the drive shaft 19 is transmitted to the impeller 21 through the ball 28.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cooling device that cools an engine by circulating cooling water between a water jacket of the engine and a heat exchanger.

[Technical background of the invention and its problems]

In this type of cooling system, the cooling water cooled by the heat exchanger (C radiator) is pumped into the engine's water jacket by a water pump, or when the cooling water is at a low temperature, such as immediately after starting the engine, , there is a necessary force S to quickly raise the temperature of this cooling water. For this reason, in conventional systems that use thermostats to control the temperature of cooling water flow, it is necessary to close the thermostat to circulate the cooling water without turning on the heat exchanger, or to stop the rotation of the fan to improve cooling efficiency. It is known that it was designed to reduce the number of people.

However, since the water pump is rotatably driven by power transmitted from the engine's crankshaft, it is constantly in operation while the engine is running, so in any case, the cooling water flows between the engine and the heat exchanger. You will be able to circulate through the connecting circulation route.

Therefore, during this circulation, the engine heat transferred to the cooling water is transferred to the water jacket. This causes problems such as increasing the flow rate of the cooling water and increasing the amount of time required for engine operation.

[Object of the invention] The present invention was made based on this unreasonable situation,
The object of the present invention is to provide a cooling device for a water engine that can warm up the engine in a short time. A clutch is interposed between the drive shaft and the impeller, and this clutch is turned on and off by a temperature rudder that is connected to the engine (a), that is, an unpleasant member that senses the temperature of the cooling water - IP or the temperature of the cylinder. In addition, the drive shaft and the impeller are selectively coupled based on engine temperature.

[English example of invention]

A first embodiment of the present invention will be described below based on FIGS.

In Fig. 1, l is a frame, and a water-cooled engine 3 is suspended and supported on the down tube 2 of the frame. engine 3
A cylinder block 5 is installed upright on the crankcase 4 of the cylinder block 5, and a water jacket (not shown) is formed in the cylinder block 5 and the cylinder head 6 so as to surround the cylinder and the combustion chamber. A radiator 1 as a heat converter is installed in front of the engine 3, and cooling water is circulated through Ia between the radiator 2 and the water jacket of the engine 3, amounting to 7L.

And in the middle of this cooling water circulation path, is there a radiator? A water pump 8 is provided for pumping the cooling water that has been heat-converted in the water jacket into the water jacket. The water pump 8 is built into the crankcase 4 as shown in FIGS.
The side opening of the pump case 9 is restored by the pump cover 11, and the pump A chamber 12 is formed in the pump chamber 12. A suction port 13 and a discharge port (not shown) are formed in the pump chamber 12, and the suction port 13 is connected to the lower tank 15 of the radiator 2 through a communication passage 14'? , the discharge port is connected to the water jacket of the cylinder block 6.

A drive shaft 19 is rotatably supported on the boss portion 16 of the pump case 9 via a bearing 12 and a seal 1B'l, and a drive gear 20 is attached to one end thereof facing into the crankcase 4. The drive gear 20 is always in mesh with a gear on the crankshaft side (not shown), and therefore the drive shaft 19 is rotationally driven by power transmitted from the crankshaft.

The other end of the jumping shaft I is introduced into the pump chamber 12, and the boss portion 2 of the impeller 21 is provided on the outer periphery of this introduced portion.
2 are relatively rotatably attached.

A clutch 23 is interposed between the drive shaft 19 and the boss portion 22 to transmit the rotation of the drive shaft 19 to the impeller 21 in an intermittent manner. Details of this clutch 23 are shown in FIG. That is, a slider 25 is fitted into a guide hole 24 formed at the other end of the drive shaft 19 so as to be slidable in the axial direction, and the outer periphery of the slider 25 at one end has a tapered surface 26. is doing. In addition, on the other end of this drive shaft 19, the A-shaped outer circumferential surface has
A pair of through holes 2F and 2F are opened facing each other,
These through holes 22 22 face the circular surface of the boss portion 22 and are connected to the guide hole 24 . Balls 28 and 28 are accommodated in the through holes 22 and 22, respectively, and these balls 28 and 28 are in rolling contact with the inner surface of the boss portion 22 and the tapered surface 26 of the slider 25. A cap 29 is screwed into the opening at the other end. This cap 29 is made of a material with good thermal conductivity and faces into the pump chamber 12. A trap rod portion 30 that protrudes from the other end of the slider 25 is slidably fitted into the cat 29, and a space surrounded by the tip end surface of the rod portion 30 and the inner surface of the gap 29. is filled with 1.1 wax 31 as a temperature sensitive member. temperature sensitive wax 3
1 expands and contracts according to the temperature of the cooling water in the pump chamber 12, and expands when the temperature of the cooling water completely exceeds a predetermined value. It looks like a river is flowing inside.

In the drawing, reference numeral 32 indicates a return spring that urges the slider 25 back, 33 indicates a mechanical seal that fluid-tightly separates the clutch 23 from the inside of the bonfu chamber 12, and 35 indicates the upper stand 13 of the radiator 2, the tank 34, and the cylinder head 6. The return pipes connected to the quarter jacket are shown.

According to the 141 configuration, immediately after starting the engine 3, the a of the cylinder block 6 and the cylinder head 6 are
Because the L degree is low, the temperature of the cooling water is also suddenly low.
For this reason, the temperature sensing arm 91 is contracted, and the slider 25 is pushed back in the direction of arrow A in FIG. 4 by the return spring 32. Therefore, the balls 28, 28 sink 15 degrees inward in the radial direction in the direction of inclination of the tapered surface 26, and simply roll rotatably against the inner surface of the boss portion 22, so that the clutch 23 It is in a state of being cut,
0Jf (MekI (x moving axis 19 is the impeller 21 Bonu f
1) The impeller 22 idles, and no rotational force is transmitted to the impeller 21.

In other words, since the pumping action of the water bong 8 is not performed, the cooling water remains in the circulation system, and this buildup and the heat of the cylinder block 6 and cylinder head 6 dissipate the cooling water in the circulation system. Since the temperature does not need to be transmitted to the entire engine, the temperature of the local cooling water around the engine 3 rises in a short time, promoting warm-up of the engine 3.

When the temperature of the cooling water exceeds a certain value due to such warm-up, the temperature-sensitive wax 31 expands based on this temperature increase and pushes the slider 25 into the guide hole 24. Then, the balls 28.28 are pushed outward in the radial direction according to the inclination of the tapered surface 26 and are pressed against the inner surface of the boss portion 22, so that the rotation of the drive shaft 19 is transmitted to the impeller 21 via the balls 7ν2B and 2B. , the drive shaft 19 and the impeller 21 rotate together.

The rotation tc of the impeller 21 forces the cooling water into the water jacket, so the cooling water is circulated between the engine 3 and the radiator 2, flowing through the water jacket and reaching a high temperature. The heat is dissipated by the radiator 2.

According to such a cooling system, since the cooling water is not circulated when the cooling water temperature is low, it is possible to raise the temperature of the engine 3 in a shorter time than with conventional equipment, which contributes to the same improvement in fuel efficiency. .

Also, of course you can omit the Tokubetsu Onna Sumeto Stat,
In particular, in this embodiment, the temperature of the cooling water is detected on the drive shaft 19 near the clutch 23, so the linkage structure with the clutch 23 can be kept within the drive msy circle, making the entire system more compact. There are some advantages to this.

Note that the present invention is not limited to the first embodiment described above, and a second embodiment of the present invention is shown in FIGS. 5 to 7. To explain the clutch 41 of the second embodiment, a pair of elongated holes 42.42 are formed in the outer peripheral surface of the other end of the drive shaft 19 along the axial direction.
The inner surface of the boss portion 522 facing the ball 28.2
A pair of four portions 43, 43 into which 8 can be inserted are formed facing each other. In addition, a ball support hole 45 is formed through the slider 44 slidably fitted into the guide hole 24 along the radial direction, and balls 28 and 28 are formed at both ends B (") of the ball support hole 45. The balls 28, 28 are positioned in the elongated holes 42, 42, and are urged radially outwardly by a spring 46 so that the boss portion 2
It is rotatably pressed against the inner surface of 2. On the other hand, the slider 44
A temperature-sensitive member 48 made of a thermally responsive element such as a bimetal or a shape memory alloy is installed between the other end and a cap 42 screwed into the end of the guide hole 24 on the pump chamber 12 side. Like the temperature-sensitive wax 31, the temperature-sensitive member 48 expands and contracts depending on the temperature of the cooling water.
When the water temperature exceeds a set value, it will contract from its expanded state.

According to the second embodiment having such a configuration, when the temperature of the cooling water is low, the temperature sensing member 48 expands, so the slider 44 is pushed into the guide hole 24, and therefore the balls 28, 28 are detached from the recesses a, v, and 4s and are in rolling contact with the inner surface of the boss portion 22. Therefore, the drive shaft 19 idles relative to the boss portion 22, and no rotational force is transmitted. When the cooling water temperature rises from this state and exceeds a certain level (l11), the temperature sensing member 48 rapidly contracts and pulls out the slider 44 toward the cap 42. Then, the ball 28.28 enters the elongated hole 42.42. move along
When it is paired with the recesses 43, 43 on the inner surface of the boss portion 22, it is elastically fitted into the recesses 43.431;'l Ic. This fitting causes the drive shaft 19 and the impeller 21 to rotate together, and the cooling water is circulated by the pumping action of the water pump 8.

8 and 9 show the clutch 51 of the present invention (13th embodiment). First, the clutch 51 of the third embodiment 61 will be explained. On the outer peripheral surface of the drive shaft 19 on the impeller 21 side, there is a slider. The slider 52 is mounted to be movable in the axial direction by straight spline engagement but not rotatable in the periaxial direction, and this slider 52 is attached to the impeller 2.
A coil 54 is arranged on the slider 52, and a ring-shaped IA stone 53 embedded in one end surface of the slider 52 is interposed therebetween.
The end layer is wound. A wire N95 s, 55, which is derived from both poles of this coil 54, is a slip ring 5.
The power supply lines 51', 51' are electrically connected to the power supply line 57゜52 via the switch 5.
8. Main switch 59? ! : Av, 1 is connected to a battery 60 as a power source.

On the other hand, in this third embodiment, instead of detecting the temperature of the cooling water, the temperature of the cylinder block 5 of the engine 3 is directly detected by the temperature sensing member 61, and due to the expansion and contraction of the temperature sensing member 61, When the changeover switch 58 is operated, the polarity of the battery 60 with respect to the coil 54 is reversed depending on the temperature of the cylinder block 5.

According to the third embodiment having such a configuration, when the temperature of the cylinder block 5 is low, a current flows in the coil 54 in a direction in which an excitation force of the same polarity as that of the magnet 53 is generated. Since they repel each other, the slider 62 is moved in a direction away from the impeller 21 due to this repulsive force. Therefore, the driving shaft 19 idles relative to the impeller 21, and no rotational force is transmitted.

In this state, when the temperature of the cylinder block 5 exceeds a certain value, the changeover switch 68 is operated to switch the coil 54.
Since the polarity of the battery 60 is reversed, a current flows through the coil 54 in the opposite direction to that at low temperatures. Therefore, since the coil 54 and the magnet 53 are attracted to each other, the slider 5
2 is attracted and comes into close contact with the magnet 53. Therefore, the rotation of the drive shaft 19 is transmitted to the impeller 21 through the slider 52 and the magnet 53, and as a result, the impeller 21 rotates together, and the cooling water is circulated.

Further, in each of the embodiments described above, the thermostat is omitted, but for example, as in the fourth embodiment shown in FIG. As shown by the imaginary line in FIG. 2, the downstream side of this thermostat 21 and the upper tank 34 of the radiator 2 may be connected by a bypass passage 22. In this case, the sensing temperature of the temperature-sensitive wax 31 and the thermostat (FJ) may be different, for example, the temperature-sensitive wax 31.
1 expands and the temperature at which clutch 41f lasts is 50°C,
and thermostat) 71 sets the temperature at which the communication passage 14 opens to 70
If installed at C, if the cooling water temperature is about 60 or higher,
The cooling water is circulated bypassing the bypass passage 22 without passing through the radiator 2. Therefore, there is no heat exchange effect in the radiator 2, but rather the cooling water is warmed in a short time.
Encourages engine 3 to warm up. Note that the clutch 41 of this fourth embodiment is the same as that of the second embodiment described above, and the temperature-sensitive wax 31 is also the same as that of the first embodiment, so the same numbers will be assigned and the description thereof will be omitted. omitted.

〔Effect of the invention〕

According to the present invention described in detail above, since the cooling water is not circulated when the cooling water temperature is low, the temperature of only a small amount of the cooling water in the water jacket of the engine increases. It has the advantage of being able to heat up quickly and warming up in a short time.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention,
Figure 2 is a side view of the motorcycle, Figure 2 is a side view of the engine area, Figure 3 is a sectional view along ill-I MU in Figure 2, Figure 4 is a sectional view of the water pump, and Figure 5 or cuff. The figures show a second embodiment of the present invention, FIG. 5 is a sectional view of the water pump, FIG. 6 is a sectional view taken along vr-vti in FIG. 5, FIG. 7 is a plan view of the drive shaft, and FIG. 9 and 9 show a third embodiment of the present invention, FIG. 8 is a sectional view, FIG. 9 is an enlarged sectional view of the clutch, and FIG.
4 is a sectional view showing an example. 3...Engine?・・・Heat 'J m a (5 jieta), 8...Water pump, 19...Drive shaft, 2
1... Impeller, 23. dl, 51... clutch,
31°18m6I...Temperature-sensitive member [temperature-sensitive wax]. Applicant's agent Patent attorney Takehiko Suzue Figure 10■ '1 Dan1. 1 1 21 1. 29 〕° To Rama Tayumisu 11

Claims (1)

[Claims] In a water-cooled engine that circulates cooling water between a water jacket and a heat exchanger of the engine, a water pop is provided in the cooling water circulation path to forcefully feed the cooling water into the water jacket, This water pump has a drive shaft that supports an impeller and is rotationally driven by power transmission from the engine, and a clutch that intermittably transmits the rotation of the drive shaft to the impeller is installed between the drive shaft and the impeller. A cooling shadow L for a water-cooled engine, characterized in that a temperature-sensitive member is provided that senses the temperature on the engine side and operates the clutch to the disengaged side when the temperature does not reach the set temperature.