CN2106739U

CN2106739U - Heat-sensitive automatic clutch for vehicle fans

Info

Publication number: CN2106739U
Application number: CN 91219368
Authority: CN
Inventors: 党润田; 丁天凡
Original assignee: Longyuan Chemical And Electromachinery Tech Co Haidian District Beijing
Current assignee: Longyuan Chemical And Electromachinery Tech Co Haidian District Beijing
Priority date: 1991-08-05
Filing date: 1991-08-05
Publication date: 1992-06-10

Abstract

The utility model relates to a heat-sensitive automatic clutch for the vehicle fan. The exterior margin of a left half clutch, which forms a cone shape, can be matched with a cone-shaped tank in a right half clutch; the clutch is arranged on a hollow shaft through a bearing and a hollow shaft sleeve. The right end of the hollow shaft is provided with two heat-sensitive memory alloy springs having different temperature setting points. The springs are arranged in the internal cavity of a water pump impeller; when the cold water temperature exceeds the preset temperature, the spring are extended; thus, a draw rod can drive the left half clutch to overcome the elastic force of a balance spring and is connected with the right half clutch, which is the reason why the fan rotates. Contrarily, if the clutch is disengaged, the fan stops. The second heat-sensitive spring can continue working after the first heat-sensitive fails, so the damage of the engine, which is caused by overheating, can not happen.

Description

Heat-sensitive automatic clutch for vehicle fans

The utility model relates to a kind of automatic heat-sensitive clutch for car fan, belongs to the automobile cooling system technical field of parts 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 travel under the overtemperature state, and fan shut down, coolant water temperature rises 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 purpose of this utility model is that a kind of automatic heat-sensitive clutch for car fan will be provided, and it can overcome above-mentioned shortcoming.

The purpose of this utility model is to realize 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 to compress the O RunddichtringO, 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 left half-clutch contact with the inner conical groove of right semi-clutch and make fan running.Power-transfer clutch is contained in above the hollow shaft sleeve by 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 left half-clutch (7) is taper, and it can intermesh with the cone tank on the right semi-clutch (9), and 1 bearing (5) is housed in the endoporus of right semi-clutch (9), refills on hollow shaft sleeve (29); Lining (28) is contained on hollow shaft sleeve (29) middle part, its right-hand member presses the interior ring of bearing (5) and the step of hollow shaft sleeve (29), make bearing (5) unlikely mobile, sliding sleeve (3) inserts in the endoporus of left half-clutch (7), refill on hollow shaft sleeve (29), between the groove of left half-clutch (7) and the lining (28) balance spring (6) is housed, the left side of the right side of hollow shaft sleeve (29) and pulley conical disk (12) and lining (10) link into an integrated entity with screw (11), be fixed on again above the hollow shaft (14), locate with spring collar (30), pump body (13) is with two bearings (24), (25) be contained on the hollow shaft (14), spacer (31) is housed between bearing (24) and (25), bearing (24) outer shroud is fixing with spring clip (32), the outer shroud of bearing (25) is by the step location of the pump housing (13) endoporus, pleased ring is located with clip (33), 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), pull bar (15) left end also passes hollow shaft sleeve (29) and stretches out, refill a gland (4), the step of gland (4) partly just in time withstands sliding sleeve (3), the left side is fixing with nut (2), and locate with pin (1), two memory alloy springs (20) are housed on pull bar (15), (21), the pull bar right-hand member has external screw thread, fishplate bar (22) is fixed on the pull bar right-hand member, make memory alloy spring (20), (21) in lobus dexter wheel (16) endoporus, keep the tram, impeller (16) right side is fixed on cover plate (17) on impeller (16) right side with bolt (18), and compress O type seal ring (19), impeller (16) the right pump cover of suit (34), pump cover (34) is to be fixed on above the pump housing (13) with bolt (35), and fan (27) is contained on right semi-clutch (9) right-hand member with bolt (23) and becomes one.

The spring that two memorial alloys are made has different design temperature points, for example the design temperature of spring (20) is 75-95 ℃, 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 was lower than specified value, memory alloy spring was balanced length of spring compressed, the taper outer rim of left half-clutch (7) and the cone tank on the right semi-clutch (9) was disengaged, so fan quits work; When coolant water temperature is specified value, memory alloy spring (20) refresh memory and extending, pull bar (15) is moved right, endoporus step compression balance spring (6) by nut (2) gland (4) and left half-clutch (7), cause left half-sum right semi-clutch (7), (9) to be intermeshed, so fan entry into service work makes combustion engine reach cool effect.

Compared with prior art, the utility model clutch 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 owing to coolant-temperature gage raises engine being damaged, so second spring plays the effect of security insurance.

2, two memory alloy springs place in the water pump vane chamber, and temperature-sensitive is more accurate.

3, adopt cover plate and O RunddichtringO structure, sealing is reliable, and is easy to maintenance.

Claims

1, a kind of automatic heat-sensitive clutch for car fan, the outer rim that it is characterized in that left half-clutch (7) is taper, can be meshed with right semi-clutch (9) left side cone tank, bearing (5) is housed in the endoporus of right semi-clutch (9) to be refilled on hollow shaft sleeve (29), lining (28) is contained in sky and gives on axle sleeve (29) middle part, sliding sleeve (3) inserts in left half-clutch (7) endoporus, refill on hollow shaft sleeve (29), between the groove of left half-clutch (7) and the lining (28) balance spring (6) is housed, hollow shaft sleeve (29) right side and pulley conical disk (12) left side and lining (10) are connected in one with screw (11), be fixed on again above the hollow shaft (14), pump body (13) is with two bearings (24), (25) be contained on the hollow shaft (14), spacer (31) is arranged between the bearing, water pump vane (16) is contained in hollow shaft (14) right-hand member, pull bar (15) is contained in the hollow shaft (14), pull bar (15) left end passes hollow shaft sleeve (29) and stretches out, refill upper press cover (4), the left side is fixing with nut (2), use pin (1) location again, pull bar (16) right-hand member is equipped with 2 memory alloy springs (20), (21) baffle plate (22) is fixed on above the pull bar right-hand member.

2, self-acting clutch according to claim 1 is characterized in that impeller (16) right side is fixed on cover plate (17) on the impeller (16) with bolt (18), and compresses O type seal ring (19).

3, power-transfer clutch according to claim 1 is characterized in that two memory alloy springs have different design temperature scopes, and the setting range of working memory spring (20) is 75-95 ℃, and the setting range of memory spring (21) is 90-120 ℃.