CN101040107A

CN101040107A - Cooling system

Info

Publication number: CN101040107A
Application number: CNA2004800357691A
Authority: CN
Inventors: A·菲略; E·里贝罗; E·费拉斯; F·加斯塔尔多
Original assignee: WOP IND E COM DE BOMBAS Ltda
Current assignee: WOP IND E COM DE BOMBAS Ltda
Priority date: 2003-12-03
Filing date: 2004-11-30
Publication date: 2007-09-19
Also published as: AR047563A1; JP2007513287A; BRPI0417180A; GB0327966D0; EP1709308A1; WO2005054640A1; GB2408775A

Abstract

A cooling system for an internal combustion engine including a pump with an impeller (10) for pumping liquid coolant around a cooling circuit, and a drive shaft (14), wherein between the impeller (10) and drive shaft (14) there is provided a clutch (16) including first (18) and second (20) clutch members which are moveable into and out of engagement, to connect and disconnect drive from the drive shaft (14) to the impeller (10) respectively, by a temperature sensitive device (22) which includes a chamber (24) in which there is provided a material (26) which over a first, lower, temperature range is in a first state, and over a second, higher, temperature range is in a second state, the material (26) changing in volume when transforming from the first to the second state to urge the first (18) and second (20) clutch members together to transmit drive, and wherein the impeller (10) has an internal hollow (12a) into which coolant to be pumped may pass, so that the coolant is in thermal communication with the material (26) in the chamber (24).

Description

Cooling system

Technical field

The present invention relates to cooling system, relate in particular to the cooling system that is used for internal-combustion engine, this cooling system comprises the pump that has the impeller that is used for the pumping liquid freezing mixture and by engine-driven transmission shaft.

Background technique

Typically, described impeller is directly connected to the transmission shaft of motor, thereby has direct relation between the rotational speed of the running speed of motor and pump impeller, promptly when the running speed of motor, and when the rotational speed of transmission shaft increased thus, the rotational speed of pump impeller increased.In this case, the speed that the running speed of pump can not be independent of motor is controlled, and when motor in the running pump will always work, no matter whether need around the cooling circuit pumping coolant.

Be independent of engine speed control freezing mixture around the mobile equipment of motor in order to provide, the known electric clutch system that between the impeller of transmission shaft and pump, provides, it is started by electricity so that will arrive pump impeller from the drive transmitting of transmission shaft by electric controller.The shortcoming of this system is its more complicated, because it must provide the electrical connection between electric controller and the clutch system, so clutch system is not easy to be integrated in the existing engine-cooling system.

Summary of the invention

According to the present invention, we provide a kind of cooling system that is used for internal-combustion engine, it comprises the pump that is used for centering on cooling circuit pumping liquid freezing mixture that has impeller, and transmission shaft, wherein between described impeller and described transmission shaft, provide the clutch that comprises first and second clutch component, described first and second clutch component can move into or be disengaged by temperature sensitive device, will driving to connect respectively and disconnect from described transmission shaft to described impeller, described temperature sensitive device comprises the chamber that wherein provides a kind of material, described material is in first state in first low temperature range, be in second state at second high temperature range, when described material Volume Changes when first state-transition is second state drives to transmit first and second clutch component are pushed to together, and wherein said impeller is constructed such that the freezing mixture for the treatment of pumping and the material thermal communication in the described chamber.

Therefore, according to the present invention, a kind of cooling system is provided, wherein only when temperature surpasses predetermined value described pump be used for automatically around the cooling circuit pumping coolant, and do not need to use the space in the engine compartment to hold independent electric controller or any electrical connection that is connected to described clutch is provided.

Preferably, expand when this material when first state-transition is second state of the material in the described chamber.

Preferably, when described material is in first state, be solid-state, be liquid when described material is in second state.

Preferably, the material in the described chamber of described temperature sensitive device is a wax.

Preferably, described impeller has the boring part, treats that the freezing mixture of pumping can enter described boring part.In this case, preferably, the described chamber of described temperature sensitive device extends in this boring part.

Preferably, described system comprises the fexible bias pressure element, and this fexible bias pressure element acts at least one described clutch component to promote described clutch component towards separated configuration.

Description of drawings

Now will embodiments of the present invention will be described by referring to the drawings as just example, described accompanying drawing illustrates the part of cooling system according to a first aspect of the invention.

Embodiment

With reference now to accompanying drawing,, it illustrates a part that is used for around the pump of the cooling circuit pumping liquid freezing mixture of internal-combustion engine, and described pump comprises pump impeller 10, and this pump impeller comprises installing and is used for the impeller shaft 12 that rotates at pump case (its part is shown in 13).Pump impeller 10 and shell 13 belong to traditional design, and are adapted such that the impeller 10 in the shell causes the fluid in the shell is pumped into the outlet (not shown) that is located at the pump case 13 from the inlet (not shown) around the rotation of the longitudinal axis A of impeller shaft 12.

This system also is provided with transmission shaft 14, this transmission shaft is connected to the motor (not shown) makes the running of motor cause the longitudinal axis rotation of transmission shaft 14 around transmission shaft 14, and described transmission shaft 14 is positioned such that its longitudinal axis overlaps with the longitudinal axis of impeller shaft 12 substantially.Transmission shaft 14 can be by motor or by directly driving such as gear or the such transmission device of belt transmission machine.

Between second end of impeller shaft 12 and transmission shaft 14, provide the clutch 16 that comprises first clutch parts 18 and second clutch parts 20, described first and second clutch component are removable to be entered or is disengaged, with will be from transmission shaft 14 to impeller shaft 12 driving connect respectively and disconnect.

First clutch parts 18 have and are roughly columniform main body 18a and directly adjacent with the impeller shaft 12 flange 18b that extends radially outwardly.Keep first clutch parts 18 by retainer 32 with respect to impeller shaft 12, first end of described retainer is fixed to, and that is with the flange that extend radially outwardly 36 of bolt to second end that is located at impeller shaft 12 in this example.Retainer 32 has: sealing is roughly the sidewall 32a in columniform space, and first clutch parts 18 are arranged in described space; With extend radially inwardly lip formation 32b, this lip formation extends from sidewall 32a at second end of retainer 32.Lip formation 32b provide perforate, the diameter of this perforate enough greatly with the main body that allows first clutch parts 18 by wherein, but pass through wherein enough for a short time again with the flange that prevents first clutch parts 18.Therefore, although allow first clutch parts 18 to be in substantially parallel relationship to the longitudinal axis motion of impeller shaft 12, retainer 32 limits such motion, and keeps the first clutch 18 of adjacent impeller axle 12.

In this example normally the fexible bias pressure element 34 of spiral compression spring at the lip formation 32b of retainer 32 with between the flange that first end of first clutch parts 18 extends radially outwardly.The lip formation 32b that spring 34 twines the cylinder-shaped body 18a of first clutch parts 18 and is used to separate described flange and retainer engages impeller shafts 12 up to first clutch parts 18.Therefore, spring 34 is towards being disengaged position bias voltage first clutch parts 18, is disengaged in the position first clutch parts and transmission shaft 14 at interval described.

The biasing force that first clutch parts 18 overcome spring 34 by temperature sensitive device 22 moves into and the engaging of disengaging and second clutch parts 20, and described temperature sensitive device is installed between impeller shaft 12 and the first clutch parts 18 to be used for impeller shaft 12 rotations.Temperature sensitive device 22 comprises chamber 24, and wax 26 is provided in this chamber, and this wax is solid-state in first low temperature range, and at second high temperature range partial melting at least.

Provide to be roughly columniform perforate, this perforate is extended between the end of the impeller shaft 12 of chamber 24 and contiguous first clutch parts 18, and is roughly columniform piston element 28 and is arranged in this perforate.The first end 28a of piston element 28 is contained in the groove of the cylinder-shaped body 18a that is located at first clutch parts 18, and the second opposite end 28b of piston element 28 is positioned at the center of chamber 24 substantially, and is surrounded by wax 26.The second end 28b of piston element 28 is being roughly coniform shape in shape.Allow the cooperation between piston element 28 and the perforate, but prevent that substantially wax 26 is by perforate 24 leakages from the chamber.

Impeller shaft 12 is provided with hollow parts 12a, this hollow parts extend to the impeller shaft 12 adjacent with transmission shaft 14 the end and with pump case 13 in fluid communication.The chamber 24 of temperature sensitive device extends among the hollow parts 12a, makes fluid among the hollow parts 12a and wax 26 thermo-contacts in the chamber 24.

Second clutch parts 20 are the plate that is roughly circle that is located at an end of the transmission shaft 14 adjacent with impeller shaft simply.

Adjacent with first clutch parts 18 and the second clutch parts 20 respectively impeller shaft 12 and the end of transmission shaft 14 are supported for rotating in roller bearing 30 around their longitudinal axis A separately, and described roller bearing is installed in the pump case 13.

The following running of described cooling system.

When the temperature of cooling fluid was lower than predetermined value, wax 26 was solid-state, and the biasing force of spring 34 guarantees that first clutch parts 18 do not contact with second clutch parts 20, therefore drives and is not delivered to impeller shaft 12 from transmission shaft 14.Therefore, even motor turns round, pump is not worked yet, to such an extent as to and do not waste energy come the pumping cooling fluid to/around the enough low motor that cools off in addition of not needing of its temperature.

Between the on-stream period of motor, the temperature of motor increases gradually, and this causes the temperature of cooling fluid to increase gradually, and described cooling fluid comprises the cooling fluid among the hollow parts 12a of impeller shaft 12.The cooling fluid of heat from the hollow parts 12a of impeller shaft 12 is delivered to the wax 26 in the chamber 24, so the temperature of wax 26 increases.When the temperature of wax 26 was enough high, wax 26 began fusing, and expanded when fusing, therefore promoted piston elements 28 towards first clutch parts 18.The second end 28b of piston element 28 is roughly conical shape and can helps this.

Therefore piston element 28 applies power to first clutch parts 18, and described biasing force of making every effort to overcome clothes spring 34 promotes first clutch parts 18 towards second clutch parts 20.

When first and second clutch component 18,20 engage, drive and be delivered to impeller shaft 12, and impeller shaft 12 rotates around its longitudinal axis A from transmission shaft 14.Therefore in case the running of pump began when motor arrived the required sufficiently high temperature of cooling.

For example after turning off engine, when the temperature of motor drops to predetermined value when following, wax 26 begins to solidify, and therefore shrinks.When the volume of the wax in the chamber 24 reduced, first clutch parts 18 moved away second clutch parts 20 under the effect of the restoring force of spring 34.Therefore impeller shaft 12 disconnects with transmission shaft 14, and the rotational speed of pump impeller 10 reduces to stop fully up to the running of pump.

Claims

1. cooling system that is used for internal-combustion engine, it comprises the pump that is used for centering on cooling circuit pumping liquid freezing mixture that has impeller, and transmission shaft, wherein between described impeller and described transmission shaft, provide the clutch that comprises first and second clutch component, described first and second clutch component can move into or be disengaged by temperature sensitive device, will driving to connect respectively and disconnect from described transmission shaft to described impeller, described temperature sensitive device comprises the chamber that a kind of material wherein is provided, described material is in first state in first low temperature range, and be in second state at second high temperature range, when described material its Volume Changes when first state-transition is second state drives to transmit first and second clutch component are pushed to together, and wherein said impeller is constructed such that the freezing mixture for the treatment of pumping and the material thermal communication in the described chamber.

2. cooling system according to claim 1, wherein, when the material in the described chamber of described temperature sensitive device when first state-transition is second state, this material expands.

3. cooling system according to claim 2 wherein, is solid-state when described material is in first state, is liquid when described material is in second state.

4. cooling system according to claim 3, wherein, described material is a wax.

5. according to each described cooling system in the aforementioned claim, wherein, described transmission shaft has the boring part, treats that the freezing mixture of pumping can enter in the described boring part.

6. cooling system according to claim 5, the chamber of described temperature sensitive device extend in the boring part of described transmission shaft.

7. according to each described cooling system in the aforementioned claim, wherein, described system comprises the fexible bias pressure element, and this fexible bias pressure element acts at least one described clutch component to promote described clutch component towards separated configuration.