CN1068784A - Automatic heat-sensitive clutch for car fan - Google Patents

Abstract

A kind of automatic heat-sensitive clutch for car fan, the outer rim of its power-transfer clutch are that taper can match with the inner conical groove of belt pulley, and power-transfer clutch is contained on the hollow shaft by bearing, sliding sleeve, and the right-hand member of axle is equipped with the heat-sensitive memory alloy spring of 2 different set temperature spots.This spring is contained in the water pump vane inner chamber, when coolant water temperature surpasses design temperature, and the spring elongation, the elastic force that makes pull bar drive power-transfer clutch overcome balance spring engages with belt pulley, thereby the fan rotation, on the contrary power-transfer clutch and belt pulley are thrown off, and fan just stops.Second temperature sensing spring can work at first spring failure, makes the unlikely cause thermal damage of crossing of driving engine.

Description

Automatic heat-sensitive clutch for car fan

The present invention relates to a kind of automatic heat-sensitive clutch for car fan, belong to the automobile cooling system technical field of part in addition.

Only some time needs fan running to automobile in the process of moving at present, in order to save oil consumption, generally adopt power-transfer clutch to control the running of fan and stop, domestic existing multinomial patent, for example the self-acting clutch of patent such as CN2035019U and 2052050U all adopts spring that marmem makes as thermal element, this spring all has the temperature spot of a setting, when the ambient temperature of spring element meets or exceeds the temperature of this setting, spring is with regard to refresh memory, compress balance spring (or retracing spring) by mechanism during its elongation and make clutch engagement then, fan is running just, be lower than the design temperature point in temperature, spring does not extend, do not recover its memory performance, under the effect of balance spring and appropriate authority, power-transfer clutch is disengaged, thereby fan shuts down, the fatal shortcoming of these power-transfer clutchs is when spring work number of times surpasses the life-span (about 10000 times), the memory performance forfeiture, spring just lost efficacy, and cause automobile to sail row under the overtemperature state, and fan shut down, coolant water temperature is gone up long rapidly, the consequence that causes the driving engine parts to damage finally.

In addition, 89202218.3 the power-transfer clutch of patent is that memory alloy spring is contained in the water tank back, relying on it to experience the water tank width of cloth penetrates temperature and carries out work, because ambient temperature often is subjected to the influence of external factors such as weather, area, wind band bigger, because temperature sensor is inaccurate, make fan can not adapt to need of work, even can't use.

88205803.4 patent has been done improvement to this, memory alloy spring is contained in the water pump vane, directly contacts with water, and from the hollow shaft of pump, pass the action that a pull bar comes control clutch, its shortcoming is to adopt the sealing of bellows, and its sealing property is unreliable, inconvenient maintenance.

In sum, if singly make a memory alloy spring, its limitation is always arranged as thermal element.

The objective of the invention is to provide a kind of automatic heat-sensitive clutch for car fan, and it can overcome above-mentioned shortcoming.

The object of the present invention is achieved like this, adopt two memory alloy springs as thermal element, the design temperature point of two springs also is different, two springs all are contained in the inner chamber of water pump vane, the end face of impeller adopts cover plate compact type seal ring, and spring does not contact with water, spring just extends when temperature surpasses design temperature point, recover its memory performance, by being contained in the action of hollow tubular draw-in bar, extruding power-transfer clutch inner equilibrium spring, the taper outer rim that makes power-transfer clutch contact with the inner conical groove of belt pulley and make fan running.Power-transfer clutch is contained in above the sliding sleeve on the hollow shaft by graphite oilless sintered-metal bearing, thereby clutch engagement and disengagement are all very nimble reliable.

The constructional drawing of accompanying drawing 1 automatic heat-sensitive clutch for car fan

Now in conjunction with the accompanying drawings the structure of power-transfer clutch is described in detail.

By Fig. 1, the outer rim of power-transfer clutch (7) is taper, can be meshed with belt pulley (9) left side cone tank, the endoporus of power-transfer clutch (7) is equipped with 2 graphite oilless sintered-metal bearings (5) and is sleeved on the sliding sleeve (3) again, be contained in then above the left end of hollow shaft (14), lining (10) is housed in the endoporus of pulley conical disk (9), belt pulley (9) is fixed on the lining with hex screw (23), become one, be contained in above the hollow shaft (14), between sliding sleeve (3) and lining (10), balance spring (6) is housed, pump body (13) is with three bearings (24), (25), (26) be contained in above the hollow shaft (14), bearing (24), spacer (27) is housed (25), and water pump vane (16) is contained in the right-hand member of hollow shaft (14); Pull bar (15) is contained in the hollow shaft (14), its left end has a bearing gland (4), the flange of gland just in time withstands graphite oilless sintered-metal bearing (5), use nut (2) to be contained in pull bar (15) left end then, with the position of dowel fixes nut (2), make bearing gland (4) position keep certain like this.Spring (20), (21) of two memorial alloys are housed at pull bar (15) right-hand member, fix a plate washer (22) with countersunk bolt again, right side at water pump vane is fixed on cover plate (17) above the end face with bolt (18), 0 type seal ring (19) is equipped with in inboard, a cover plate left side, and power-transfer clutch is assembled into one with screw and fan (27).

The spring that two memorial alloys are made has different design temperature points, for example the design temperature of spring (20) is 80-40 ℃, and spring (21) is 95-120 ℃, when first spring (20) reaches lifetime limitation and lost efficacy, because fan shuts down, water temperature just rises rapidly, so second spring just enters work, play a part insurance, automobile normal running is guaranteed, chaufeur just can be organized maintenance immediately according to the temperature sensing spring inefficacy of one as can be known of water thermometer temperature indicative, changes spring.

Two memory alloy springs all are mounted in the inner chamber of water pump vane, in the work not with the water direct contact, temperature-sensitive is accurate, it adopts sealing arrangement, favorable sealing property, thereby spring is not fragile but is easy to change.

When the temperature of engine cooling water is lower than specified value, memory alloy spring is balanced length of spring compressed, the taper slotted eye in the left side of the taper outer rim of power-transfer clutch (7) and belt pulley (9) is disengaged, so fan ends work, when the cooling water expansion tank water temperature was specified value, pull bar (16) compression balance spring (6) was crossed in memory alloy spring (20) refresh memory and extending, cause power-transfer clutch to contact, so fan is started working with belt pulley.

Compared with prior art, clutch of the present invention has following advantages:

1, adopt two memory alloy springs as temperature-sensing element, the design temperature difference of two springs, when first spring failure, second spring can be taken over job, avoided because coolant-temperature gage raises the transfer steel being damaged, so second spring plays the effect of security insurance.

2,2 memory alloy springs and water direct contact not is not fragile, easy to maintenance.

3, power-transfer clutch adopts the structure of taper outer rim to match with the former taper slotted eye of belt pulley inner chamber, is easy to processing, reliable in action.

Claims (2)

1, a kind of automatic heat-sensitive clutch for car fan, the outer rim that it is characterized in that power-transfer clutch (7) is taper, can be meshed with belt pulley (9) left side cone tank, the endoporus of power-transfer clutch (7) is equipped with graphite oilless sintered-metal bearing (5), be sleeved on again on the sliding sleeve (3), be contained in then above the left end of solid axle (14), lining (10) and belt pulley (9) are housed in belt pulley (9) endoporus, be fixed on the lining with hex screw (23) and become one, be contained in above the hollow shaft (14), balance spring (6) is contained between sliding sleeve (3) and the lining (10), pump body is with three bearings (24), (25), (26) be contained in above the hollow shaft (14), water pump vane (16) is contained in the right-hand member of hollow shaft (14), and pull bar (15) is contained in the hollow shaft (14), and its left end has a bearing gland (4), nut (2) is contained in pull bar (16) left end, use dowel fixes nut (2) again, pull bar (16) right-hand member is adorned 2 memory alloy springs (20), (21), fix a baffle plate (22) with countersunk bolt again.

2, self-acting clutch according to claim 1 is characterized in that water pump vane right side bolt (18) securing cover plate (17), and 0 type seal ring (19) is equipped with in inboard, a cover plate left side.