JP2588732Y2 - Engine power take-out device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power take-out device for an engine having an electromagnetic clutch having a bearing.

[0002]

2. Description of the Related Art For example, as shown in Japanese Utility Model Laid-Open No. Sho 62-56430, vehicles having auxiliary equipment such as water pumps and air conditioners, such as fire trucks and water sprinklers with water pumps and large buses with air conditioners When a part of the power of the engine for driving the vehicle is used to drive the auxiliary equipment as in the above, the power take-out shaft driven by the crankshaft of the engine is mounted on the flywheel housing of the engine,
For the power take-off shaft, a drive shaft for driving an auxiliary machine coaxially is provided, and the power take-out shaft and the drive shaft are connected via an electromagnetic clutch to take out part of the engine power. What is used is known.

[0003]

However, the electromagnetic clutch used in the above-described power take-out device for an engine has a large capacity for transmitting sufficient power to drive the auxiliary equipment, and therefore has a large electromagnetic force. In addition, the Joule heat of the coil that generates the heat is large, and the bearing itself generates a large amount of heat due to the thrust force of the clutch.As a result, the bearing also becomes hot. Have deteriorated, grease has leaked, and there has been a problem that the durability of the bearing is uneasy.

Accordingly, the present invention is to provide an engine power take-out device in which the durability is improved by keeping the temperature low even if heat from various parts acts on the bearing by cooling the bearing with a cooling fan. It is an object.

[0005]

In order to achieve the above object, the present invention provides a power take-off shaft driven by an engine, a drive shaft for driving an auxiliary machine, the power take-off shaft and the drive shaft. An electromagnetic clutch intermittently and a bearing interposed between a field core and a rotor of the electromagnetic clutch,
A power take-out device for an engine, comprising: a fan disposed near the bearing and fitted to the drive shaft.

[0006]

The temperature of the bearing can be kept low by forcibly cooling the heat conducted or radiated to the bearing by the cooling fan.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. First, in FIG. 2, reference numeral 2 generally indicates a so-called specially equipped vehicle such as a fire engine, 4 is a cab, 6 is a chassis frame,
Reference numeral 8 denotes an engine mounted on the chassis frame 6. The engine 8 is equipped with a flywheel housing 10, a clutch 12, a gear case 13, and a transmission 14, and the electromagnetic clutch 1 according to the present invention.
6 is mounted. The device 18 transmits the driving force of the engine 8 to a water pump 20 via a propeller shaft 19.

Next, as shown in FIG. 1, the power take-out device 18 is provided with a flywheel housing 1 of the engine 8.
A power take-out shaft 26 rotatably supported via a bearing 24 in a housing 22 fixed to the housing 8, and the power take-off shaft 26 is connected to the engine 8 via a gear train in a gear case 13 (not shown). A gear 28 driven by a crankshaft is fixed. At one end of the power take-off shaft 26,
An annular armature 34 is fixed via a leaf spring 32. The armature 34 is housed in a clutch casing 36 whose outer peripheral surface has a substantially cylindrical shape, and the clutch casing 36 is fixed to the flywheel housing 10.

A substantially disk-shaped clutch cover 42 is fixed to the rear end opening of the clutch casing 36 by bolts. A field core 46 having a coil 44 is fixed to a side surface of the clutch cover 42 on the clutch casing side, and a rotor 48 is interposed between the field core 46 and the armature 34. The rotor 48 is rotatably supported by the field core 46 via a bearing 52 fitted on the outer peripheral surface of the hub 50. The drive shaft 58 has its tip end rotatably supported by the power take-out shaft 26 via a bearing 59,
The key 56 is fitted to the rotor 48 so that it cannot rotate relatively. On the side surface of the clutch cover 42 on the water pump side, a support 62 has one end fixed to the clutch cover 42 and the other end fixed to the flywheel housing 10.

In the above configuration, when a switch device (not shown) is opened, the coil 44 is not energized, and the armature 34 is held at the rest position shown by the leaf spring 32,
Armature 34 and rotor 48 disposed adjacent thereto
, A small axial gap is formed, so that the rotor 48 stops, the drive shaft 58 connected to the rotor 48 does not rotate, and the water pump 20 does not operate. Next, when a switch device (not shown) is closed, the coil 44 is energized.
The armature 34 is displaced rightward in FIG. 1 against the spring force of the leaf spring 32 by the
Frictionally engage with Therefore, during operation of the engine 8, the rotor 48 rotates together with the constantly rotating gear 28, the power take-out shaft 26, and the armature 34, and the drive shaft 58 connected to the rotor 48 is driven by the key 56. Then, the coupling 76 connected to the drive shaft 58 by the key 56 is driven to drive the water pump 20 through the propeller shaft 19.
Is activated. That is, the operation of the water pump 20 is remotely controlled as necessary by operating a switch device that controls the energization and de-energization of the coil 44.

The configuration described above is exactly the same as a conventionally known power take-out device.

In this embodiment, a cooling fan 64 is fitted on the drive shaft 58 in parallel with the bearing 52. As shown in FIGS. 5 and 6, the cooling fan 64
It is formed by appropriately cutting and bending the outer peripheral portion of a sheet metal disk. A lock plate 65 for fixing the coupling 76 to the rear end of the drive shaft 58 is fixed by a bolt 78 via a washer 67. The cooling fan 64 is connected to the hub 50 of the rotor 48 and the coupling 76. It is pinched. Thereby, the cooling fan 64 is arranged near the bearing 52, and further,
The drive shaft 58 cannot be rotated relative to the drive shaft 58 by the key 56.
It is fitted in. A protector 80 for protecting the cooling fan 64 is provided on the inner periphery of the clutch cover 42.
Is fitted.

Next, the operation will be described. When a switch device (not shown) is closed and a current is supplied to a conductor in the coil 44, the coil 44 is energized. At the same time, Joule heat is generated in the conductor in the coil 44.

The return leaf spring 3 is urged by the coil 44.
The armature 34 is displaced rightward in FIG. 1 against the spring force of 2 and frictionally engages the rotor 48. The drive shaft 58 fixed to the rotor 48 with the key 56 rotates together with the rotor 48 in synchronization with the power take-out shaft 26 and the armature 34. Here, the Joule heat of the coil 44 is transmitted to the bearing 52 and the bearing 5
2 itself generates heat by the thrust force. On the other hand, the drive shaft 58
A cooling fan 64 fixed by a key 56 rotates together with the drive shaft 58. The rotation of the cooling fan 64 promotes the ventilation between the low-temperature outside air and the air in the vicinity of the bearing 52, which has been heated by the heat of the bearing 52, so that the temperature of the bearing 52 is kept low.

Therefore, according to this embodiment, the temperature of the bearing 52 is kept low by forcibly releasing the heat acting on the bearing 52 to the atmosphere by the cooling fan 64. As a result, the deterioration of the seal plate 72 of the bearing 52 is significantly prevented, and the durability of the bearing 52 is improved, so that the rate of checking in maintenance can be reduced. Further, since the cooling fan 64 is mounted only by sandwiching the cooling fan 64 between the hub 50 of the rotor 48 and the coupling 76, other components for mounting are not required. Further, the cooling fan 64 itself is made of a sheet metal which can be easily processed. Therefore, it can be implemented at extremely low cost.
Further, even with the conventional apparatus currently in use, the cooling fan 64 can be easily manufactured without any additional components for mounting, and can be retrofitted.

Next, another embodiment of the present invention will be described with reference to FIGS.
It will be described according to. This embodiment is a modification of the clutch cover 42 in the embodiment shown in FIGS. FIG. 7 is a front view of the clutch cover 42, and FIG.
FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. A cooling fan 64 is formed so as to be surrounded by the clutch cover 42, a ventilation port 66 is formed, and a cooling fin 68 is attached to the clutch cover 42. As a result, the air whose temperature has risen from the cooling fan 64 is transferred to the electromagnetic clutch 1.
Since a passage for air to flow out further than the air passage 6 is formed and the heat of the electromagnetic clutch 16 itself can be directly discharged to the atmosphere, the cooling effect can be further enhanced.

In each of the above-described embodiments, the flywheel power take-out device for the engine is used. However, it is needless to say that the present invention can be applied to other power take-out devices such as a transmission power take-out device. In addition, although a bearing in which grease is sealed by a rubber seal plate is used, the present invention can be applied to various other bearings.

[0018]

[Effect of the Invention] As is clear from the above, even if abnormally high frictional heat or the like acts on the electromagnetic clutch, the heat acting on the bearing is forcibly radiated by the cooling fan, so that the temperature of the bearing is kept low. This has the effect of preventing the bearing from deteriorating due to heat and achieving sufficient durability.

[Brief description of the drawings]

FIG. 1 is a sectional view of a power take-out device for an engine according to an embodiment of the present invention;

FIG. 2 is a schematic side view of a vehicle equipped with a power take-out device embodying the present invention.

FIG. 3 is an enlarged sectional view of the bearing in FIG. 1;

FIG. 4 is an enlarged view of a main part of the bearing of FIG. 3;

FIG. 5 is a front view of an example of the cooling fan according to the present invention.

FIG. 6 is a side view of the cooling fan of FIG. 5;

FIG. 7 is a front view of a clutch cover according to another embodiment of the present invention.

8 is a cross-sectional view of the clutch cover of FIG. 7 taken along line VII-VII.

[Explanation of symbols]

 2 Fire engine 8 Engine 10 Flywheel housing 16 Electromagnetic clutch 18 Power take-out device 26 Power take-out shaft 32 Leaf spring 34 Armature 42 Clutch cover 44 Coil 46 Filled core 48 Rotor 52 Bearing 56 Key 58 Drive shaft 64 Cooling fan 66 Ventilation port 68 Cooling fin 70 grease 72 seal plate 74 ball 76 coupling 80 protector

Claims (1)

(57) [Scope of request for utility model registration] 1. A power take-off shaft driven by an engine, a drive shaft for driving an auxiliary machine, an electromagnetic clutch connecting and disconnecting the power take-off shaft and the drive shaft, a field core and a rotor of the electromagnetic clutch. Intervening bearings,
A power take-out device for an engine, comprising: a fan disposed near the bearing and fitted to the drive shaft.