JP2005163920A - Hydraulic fan driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maximize a rotational frequency of a fan when the temperature of hydraulic fluid or torque-converter oil is increased. <P>SOLUTION: This hydraulic fan driving device comprises a hydraulic motor 7 for driving the fan 6, a hydraulic pump 3 for press-feeding the hydraulic oil sucked from a tank 1 to the hydraulic motor 7, a bypass-passage 9 connected between a discharge-side oil passage 5 of the hydraulic pump 3 and an outlet-side oil passage of the hydraulic motor to bypass the hydraulic motor 7, a relief valve 15 mounted in the bypass passage 9, a pilot passage 37 branched from the relief valve 15, and a thermo-valve 39 for a radiator to control the discharge pressure of the hydraulic pump 3 corresponding to a water temperature of an inlet of a radiator 10. A thermo-valve 70 for hydraulic oil to cut off the pilot passage 37 when the temperature of the hydraulic oil is high, and a thermo-sensing valve 80 for torque convertor to cut off the pilot passage 37 when the temperature of the hydraulic oil used in the torque convertor is high, are mounted at an upstream side of the thermo-valve 39 for the radiator. As the hydraulic oil of the hydraulic motor and the torque-convertor oil of high temperature can be quenched by rotating the fan at high speed, the interruption of work can be prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hydraulic fan drive device, for example, a technique effective when used in a hydraulic fan drive device mounted on a vehicle such as an automobile or a construction machine.

As a hydraulic fan drive device mounted on a vehicle such as an automobile, a hydraulic motor that drives the fan, a hydraulic pump that is driven by pumping hydraulic oil sucked from a tank to the hydraulic motor, and a discharge side oil of the hydraulic pump Some include a bypass passage connected to bypass the hydraulic motor between the passage and the tank, and a relief valve interposed in the bypass passage. In this type of conventional hydraulic fan drive device, a relief valve (hereinafter referred to as a thermo-sensing valve) that operates according to the water temperature is interposed in order to prevent a decrease in engine startability when the water temperature of the radiator is low. The thermosensing valve is configured to detect the water temperature of the radiator with thermowax, and to switch the control pressure of the valve to the low pressure side at a low temperature (see, for example, Patent Document 1).
JP-A-10-212951

  However, in the conventional hydraulic fan drive device, consideration is given to controlling the rotational speed of the hydraulic fan based on the temperature of the hydraulic oil and torque converter oil (hereinafter referred to as torque converter oil) cooled by the hydraulic fan. Therefore, when the temperature of the hydraulic oil or torque converter oil becomes high when the water temperature of the radiator is low and the rotational speed of the hydraulic fan is low, the temperature of the hydraulic oil or torque converter oil decreases until the temperature of the hydraulic oil or torque converter oil decreases. There is a problem that the work is interrupted.

  An object of the present invention is to provide a hydraulic fan driving device capable of raising a hydraulic fan to the maximum number of revolutions even when the temperature of the hydraulic motor hydraulic oil, torque converter oil or the like becomes high as well as the water temperature of the radiator Is to provide.

A hydraulic fan driving device according to the present invention includes a hydraulic motor that drives a fan, a hydraulic pump that pumps hydraulic oil sucked from a tank to the hydraulic motor, a discharge-side oil passage of the hydraulic pump, and an outlet side of the hydraulic motor A bypass path connected to bypass the hydraulic motor between the oil path, a relief valve interposed in the bypass path, and a control pilot branched from the relief valve and connected to the tank In the hydraulic fan drive device comprising a passage and a water temperature thermosensing valve for controlling the discharge pressure of the hydraulic pump in accordance with the cooling water temperature of the radiator in the pilot passage,
A hydraulic oil thermosensing valve that detects the temperature of the hydraulic oil and blocks the pilot passage at a high temperature is interposed upstream of the water temperature thermosensing valve.

  According to the present invention, the hydraulic oil thermosensing valve shuts off the pilot passage when the hydraulic oil is at a high temperature, so that the oil flowing to the bypass passage via the relief valve is supplied to the hydraulic motor side. The hydraulic fan can be raised to the maximum number of revolutions at high temperatures.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the hydraulic fan driving device according to the present invention is configured as a hydraulic fan driving device mounted on an automobile or the like. This hydraulic fan drive device includes a tank 1 in which hydraulic oil (not shown) is stored, and a suction side oil passage 4 of a hydraulic pump 3 driven by an engine 2 such as an automobile is connected to the tank 1. Yes. An inlet port of a hydraulic motor 7 configured to rotationally drive a fan 6 is connected to the discharge side oil passage 5 of the hydraulic pump 3. The fan 6 includes a radiator 10, a torque converter oil cooler 11, and an oil cooler 12 of an automobile. It is configured to cool. The outlet-side oil passage 8 of the hydraulic motor 7 is connected to the tank 1 through an oil cooler 12 and a filter 13 that are sequentially provided from the hydraulic motor 7 side. A filter relief valve 14 that opens when the pressure exceeds a set value is connected in parallel to the filter 13 so as to allow only the flow from the hydraulic motor 7 side toward the tank 1. The filter 13 may be interposed in the bypass path 75.

  Both ends of a bypass passage 9 that bypasses the hydraulic motor 7 are connected to the discharge-side oil passage 5 of the hydraulic pump 3 and the outlet-side oil passage 8 of the hydraulic motor 7, respectively. The relief valve 15 is interposed. As shown in FIG. 2, the relief valve 15 is incorporated into the valve unit 15 </ b> A, and the body 16 of the valve unit 15 </ b> A is assembled to the casing of the hydraulic motor 7. An inlet port 17 to which the discharge side oil passage 5 of the hydraulic pump 3 is connected to the body 16, an outlet port 18 to which the inlet side port of the hydraulic motor 7 is connected, an outlet port 19 to which the oil cooler 12 is connected, An inlet port 20 to which the outlet side oil passage 8 of the hydraulic motor 7 is connected is opened. A valve chamber 21 is formed inside the body 16, and each port communicates with the valve chamber 21. A cylindrical valve cylinder 22 is concentrically fixed to the valve chamber 21, and a valve passage 23 formed by a cylindrical hollow portion of the valve cylinder 22 communicates with the inlet port 17 and the outlet port 18. A valve seat 24 is formed at the opening end of the valve cylinder 22 on the inlet port 17 side, and a valve body 25 is detachably disposed on the valve seat 24. The valve body 25 is always urged by a spring 26 in a direction in which the valve body 25 is seated on the valve seat 24. In the vicinity of the valve seat 24 on the cylindrical wall of the valve cylinder 22, a communication hole 27 for communicating the outlet port 19 and the inlet port 20 with the valve seat 24 is opened in the radial direction. The valve body 25 is provided with a throttle 28 so as to communicate the inlet port 17 and a pilot passage 30 connected to the opposite end face of the valve chamber 21. A pilot valve 31 is connected to the pilot passage 30 via a throttle 29. The pilot valve 31 is attached to and detached from the valve seat 32 formed on the extension line of the pilot passage 30, a valve seat member 33 formed with a valve opening and a valve seat and disposed at the bottom of the valve chamber 32, and the valve seat. A valve body 34 and a valve spring 36 that constantly urges the valve body 34 in the direction in which the valve body 34 is seated by applying a reaction force to the spring seat 35 screwed into the valve chamber 32 are provided. One end of a pilot passage 37 for control is connected upstream of the pilot valve 31 in the pilot passage 30, and the other end of the pilot passage 37 is connected to a control port 38. The valve chamber 32 is connected to the bypass passage 75 by an oil passage 83.

  As shown in FIG. 1, a pilot passage 37 has a water temperature thermosensing valve (hereinafter referred to as a radiator thermovalve) 39 configured to operate in response to the cooling water temperature of the radiator, and a torque converter. Torque oil thermo valve 80 configured to operate in response to the temperature of the torque converter oil of the oil cooler 11, and hydraulic oil configured to operate in response to the temperature of the hydraulic oil in the oil cooler 12. A thermosensing valve (hereinafter referred to as a hydraulic valve for hydraulic oil) 70 is provided in order from the tank 1 side.

  As shown in FIGS. 3 and 4, the radiator thermo valve 39 is configured as a direct-acting relief valve capable of switching a set value of a spring, and is a pressure control valve (hereinafter referred to as a valve) as a valve. ) 40 and a wax-type thermosensor (hereinafter referred to as a sensor) 60. The body 41 of the valve 40 is formed in a substantially cylindrical shape having one end opened and the other end closed, and a valve chamber 42 is constituted by a cylindrical hollow portion. A plug 44 is screwed into the female screw 43 at the opening end of the body 41, and an inlet port 45 connected to the discharge side oil passage 5 through the pilot passage 37 communicates with the valve chamber 42. Has been established to do. An outlet port 46 connected to the tank 1 is opened at the closed end of the body 41 so as to communicate with the valve chamber 42.

  In the valve chamber 42, a cylindrical valve cylinder 47 is provided coaxially on the plug 44, and a valve passage 48 formed by a hollow portion of the valve cylinder 47 communicates with the inlet port 45. A valve seat 49 is formed at the opening end of the valve cylinder 47 opposite to the inlet port 45. The valve seat 49 is provided with a conical surface of a poppet 50 as a valve body in which a cylinder and a cone are integrated so as to be freely attached and detached, and a spring seat formed in a substantially cylindrical shape on the outer periphery of the column of the poppet 50. (Hereinafter referred to as a poppet side sheet) 51 is fitted. A seat portion 52 is provided in the outer periphery of the poppet side seat 51 on the plug 44 side so as to project radially outward in a circular ring shape, and one end of a valve spring 53 is locked to the seat portion 52. .

  A spring seat (hereinafter referred to as a sensor side seat) 54 formed in a multi-stage disk shape is disposed at the end of the valve chamber 42 on the outlet port 46 side, and the sensor side seat 54 serves as a piston of a sensor described later. It is connected. A valve spring seat 55 is formed in a circular ring-shaped stepped shape at the radial intermediate portion of the sensor side seat 54, and the sensor side end of the valve spring 53 is locked to the valve spring seat 55. Has been. A return spring seat portion 56 is formed in a circular ring-shaped step shape on the outer peripheral portion of the sensor side seat 54, and an action side end portion of the return spring 57 is locked to the return spring seat portion 56. . The return spring 57 is arranged concentrically outside the valve spring 53, and the reaction force side end is locked to the end face of the plug 44. In other words, the return spring 57 applies a reaction force to the body 41 and biases the sensor piston through the sensor side seat 54 in a direction to return the piston. A two-stage cylindrical head 58 is formed on the end face of the sensor side sheet 54 on the poppet side. A female screw hole 59 is formed in the closed wall of the body 41 on the extension line of the poppet 50.

  On the other hand, the sensor 60 includes a holder 61 formed in a substantially cylindrical shape, and a male screw portion 62 formed at one end portion of the holder 61 is screwed into a female screw hole 59 provided in a closed wall of the body 41 to provide a valve. 40 is fixed. A seal ring 63 is interposed between the inner periphery of the base end portion of the female screw hole 59 and the outer periphery of the base end portion of the male screw portion 62. A piston 64 formed in a round bar shape is slidably supported on the axis extension line of the poppet 50 in the holder 61, and one end of the piston 64 is inserted into the valve chamber 42. A sensor side seat 54 of the valve 40 is concentrically connected to the valve chamber insertion end of the piston 64 so as to move integrally. A cone-shaped portion 65 is formed at the other end of the piston 64, and a cover formed in a bag shape with an elastic material such as rubber or resin on the outer periphery from the cone-shaped portion 65 to the intermediate portion. 66 is covered. A cup 67 formed in a substantially bottomed cylindrical shape is disposed at the end of the holder 61 opposite to the valve 40 so as to surround the outer side of the cover 66, and the cover 66 is clamped. Is fastened together with the holder 61. Wax 68 is sealed inside the cup 67 outside the cover 66. The wax 68 is in a solid phase at a temperature lower than a preset temperature, and is prepared so as to become a liquid phase and increase in volume at a temperature higher than the preset temperature. Although the radiator thermovalve 39 is shown at a position away from the radiator 10 in FIG. 1, it is actually disposed in the inlet water channel of the cooling water of the radiator 10, and the sensor 60 is a radiator for cooling the engine. It arrange | positions so that the cooling water temperature of 10 may be detected.

  The hydraulic oil thermo valve 70 is normally open and is configured as a 2-port, 2-position, spring-offset, and spool valve, and is assembled to the valve unit 15A as shown in FIG. In FIG. 2, a valve chamber 71 is interposed in the middle of the pilot passage 37 so as to be orthogonal, and a spool valve body 72 is slidably fitted in the valve chamber 71. A spring 73 having a reaction force finally applied to the body 16 is locked to one end of the spool valve body 72, and the spring 73 is always urged in the opposite direction. The chamber on the spring 73 side of the valve chamber 71 is connected to the bypass passage 75 by an oil passage 84. A wax-type thermo sensor (hereinafter referred to as a hydraulic oil sensor) 74 is connected to the other end of the spool valve body 72. Like the wax-type thermosensor 60 of the radiator thermo valve 39 described above, the hydraulic oil sensor 74 includes a thermo wax (not shown) that is melted in response to a predetermined temperature inside the cup. The spool valve body 72 is configured to extend by the volume expansion of the wax melted at the above temperature. The hydraulic oil thermo valve 70 is switched to the closed side by the extension operation of the hydraulic oil sensor 74. In the body 16, the cup of the hydraulic oil sensor 74 is disposed inside the bypass passage 75 formed between the outlet port 19 and the inlet port 20, and detects the temperature of the hydraulic oil in the bypass passage 75. ing. That is, the hydraulic oil thermo valve 70 is switched to the closed side when the hydraulic oil sensor 74 detects that the temperature of the hydraulic oil in the bypass passage 75 has exceeded the set value. The pressure oil flowing through 37 is cut off, the valve body 25 of the relief valve 15 is pressed against the valve seat 24, the flow of the bypass passage 75 is stopped, and all the pressure oil from the hydraulic pump 3 flows into the hydraulic motor 7. Yes.

  As shown in FIG. 1, the torque valve 80 for torque converter oil is configured as a normally open 2-port, 2-position, spring-offset, and spool valve, like the hydraulic oil thermo valve 70. In FIG. 1, the torque converter oil thermo valve 80 is illustrated at a position away from the torque converter oil cooler 11, but the torque converter oil thermo valve 80 is actually installed in the torque converter oil cooler 11. That is, when the wax-type thermosensor (hereinafter referred to as a torque converter oil sensor) 81 of the torque converter oil thermo valve 80 senses that the temperature of the torque converter oil on the inlet side of the torque converter oil cooler 11 exceeds a set value. The torque valve 80 for torque converter oil can be switched to the closed side. Then, similarly to the case where the temperature of the hydraulic oil becomes high, the pressure oil flowing through the pilot passage 37 is shut off, so that the relief valve 15 is closed and the oil does not flow into the bypass passage 75. Since all the pressure oil discharged from the hydraulic pump 3 flows to the hydraulic motor side, the hydraulic motor 7 can be rotated at the set maximum number of revolutions. The maximum rotational speed of the hydraulic motor 7 is set by the spring constant of the valve spring 36 of the pilot valve 31.

  Next, the operation of the hydraulic fan drive device will be described.

  As shown in FIG. 1, when the hydraulic pump 3 is driven by the engine 2, the hydraulic pump 3 draws hydraulic oil from the tank 1 and compresses it, and feeds it to the hydraulic motor 7 through the discharge side oil passage 5. To do. A part of the hydraulic oil flows to the bypass passage 9 and flows to the control pilot passages 30 and 37 via the relief valve. The hydraulic oil thermosensing valve 70, the torque converter thermosensing valve 80, and the radiator thermovalve 39 are provided. It flows to tank 1 via. The hydraulic motor 7 rotationally drives the fan 6 with hydraulic oil from the hydraulic pump 3. The hydraulic oil that has worked by the hydraulic motor 7 is returned to the tank 1 via the oil cooler 12 and the filter 13 that are provided in the outlet side oil passage 8. In the process in which the hydraulic oil discharged from the hydraulic pump 3 is fed to the hydraulic motor 7, the discharge-side oil passage 5 is branched in the middle of the bypass passage 9 and flows through a relief valve 15 provided in the middle of the bypass passage 9. By controlling the flow rate of oil, the flow rate flowing through the hydraulic motor 7 is controlled. In addition, when the flow rate of the relief valve 15 increases, the flow rate of the relief valve 15 increases as the flow rate of the pilot passage 37 increases. Conversely, when the flow rate of the pilot passage 37 is reduced, the flow rate of the relief valve 15 decreases. It is configured as follows. Therefore, the hydraulic oil in the discharge side oil passage 5 of the hydraulic pump 3 is returned to the tank 1 by bypassing the hydraulic motor 7 by way of the bypass passage 9. Accordingly, the flow rate of the hydraulic oil supplied from the hydraulic pump 3 to the hydraulic motor 7 decreases, so the rotational speed of the hydraulic motor 7 decreases.

Next, the operation of the hydraulic fan driving device by the radiator thermo valve 39 will be described.
When the cooling water temperature of the radiator 10 is lower than a predetermined value (for example, 70 ° C.), as shown in FIG. 3, the wax 68 of the sensor 60 is in a solid state and the piston 64 is retracted. Therefore, the control pressure of the radiator thermo valve 39 is maintained at a minimum pressure (for example, 2156 kPa). In this state, the poppet 50 of the radiator thermo valve 39 is seated on the valve seat 49 by the valve spring 53. However, when a pressure higher than the set minimum pressure is applied to the inlet port 45, the valve path 48 becomes the pressure. It opens with the corresponding opening. When the valve passage 48 is opened, the hydraulic oil discharged from the hydraulic pump 3 passes through the first throttle valve 28 and is discharged to the pilot passage 37. When hydraulic oil is discharged to the pilot passage 37, a pressure difference is generated before and after the first throttle valve 28, and the relief valve 15 opens with an opening corresponding to the pressure difference. When the relief valve 15 is opened, a part of the hydraulic oil discharged from the hydraulic pump 3 to the discharge side oil passage 5 is returned to the tank 1 via the relief valve 15, so that the hydraulic oil supplied to the hydraulic motor 7 And the oil pressure in the discharge side oil passage 5 decreases. When the oil pressure in the discharge side oil passage 5 decreases, the rotational speed of the hydraulic motor 7 decreases and is controlled to 1000 rpm, for example. As a result, since the blowing power of the fan 6 is suppressed, useless power consumption is suppressed.

  When the cooling water temperature is equal to or higher than a predetermined value (for example, 80 ° C.), as shown in FIG. 4, the wax 68 of the sensor 60 is in a liquid phase state and the piston 64 is extended, The control pressure of the radiator thermo valve 39 is maintained at the maximum pressure (for example, 3332 kPa). In this state, the valve path 48 of the radiator thermo valve 39 is closed, so that a pressure difference does not occur before and after the first throttle valve 28. As a result, the relief valve 15 is closed, and the entire amount of hydraulic oil discharged from the hydraulic pump 3 to the discharge side oil passage 5 is supplied to the hydraulic motor 7, so that the hydraulic pressure of the discharge side oil passage 5 is Maximum (for example, 4900 kPa). When the oil pressure in the discharge side oil passage 5 is high, the rotational speed of the hydraulic motor 7 is increased and controlled to the maximum rotational speed (for example, 3000 rpm). As a result, since the blowing power of the fan 6 is enhanced, the cooling capacity of the radiator 10 is enhanced, and the engine 2 can be effectively cooled.

  By the way, when the water temperature at the inlet of the radiator 10 is low and the hydraulic motor 7 is at a low rotational speed, when the temperature of the hydraulic oil or torque converter oil becomes so high that the temperature of the hydraulic oil or torque converter oil needs to be cooled, The work may be interrupted until the temperature drops. However, in the present embodiment, the hydraulic oil thermo valve 70 and the torque converter oil thermo valve 80 are provided upstream of the radiator thermo valve 39, and the temperature of the hydraulic oil or the torque converter oil is set. In the case where it exceeds the maximum value, the rotational speed of the hydraulic motor 7 can be increased to the maximum rotational speed regardless of the water temperature of the radiator 10, so that the work does not have to be interrupted. The reason why the hydraulic oil thermo valve 70 and the torque converter oil thermo valve 80 are provided upstream of the radiator thermo valve 39 is that the hydraulic oil thermo valve 70 or torque converter is provided downstream of the radiator thermo valve 39. This is because if the oil thermo valve 80 is interposed, the radiator thermo valve 39 may be damaged when the hydraulic oil thermo valve 70 or the torque converter oil thermo valve 80 blocks the pilot passage 37.

  A case where the hydraulic oil becomes high temperature will be described as an example. In FIG. 2, when the hydraulic oil in the bypass passage 75 reaches a high temperature, the wax of the hydraulic oil sensor 74 of the hydraulic oil thermo valve 70 expands in a liquid state, thereby resisting the spool valve body 72 against the spring 73. Therefore, the hydraulic oil thermo valve 70 is closed. As a result, the relief valve 15 is closed, and the entire amount of hydraulic oil discharged from the hydraulic pump 3 to the discharge side oil passage 5 is supplied to the hydraulic motor 7, so that the rotational speed of the hydraulic motor 7 is the highest. The number of revolutions is increased to, for example, 3000 rpm. Since the blowing force of the fan 6 is increased by the speed increase of the hydraulic motor 7, the cooling capacity of the oil cooler 12 by the radiator 10 is increased, and the hydraulic oil can be effectively cooled.

  Note that a relief valve 82 is provided in the bypass passage 9 in parallel with the relief valve 15. This is because the hydraulic motor 7 causes the inertial force of the fan 6 when the hydraulic pump 3 rotates from a high speed to a low speed. In this case, the relief valve serves to return the oil in the oil passage 8 on the outlet side of the hydraulic motor 7 to the discharge-side oil passage 5 on the inlet side.

  The cooling action by the hydraulic oil thermo valve 70 for the hydraulic oil is the same for the torque valve 80 for the torque converter oil.

  Needless to say, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

  For example, the hydraulic valve for hydraulic oil is not limited to being assembled to a hydraulic motor, but may be assembled to a hydraulic pump, may be assembled to an oil cooler, or may be installed alone in the middle of the hydraulic oil supply circuit.

  Switching operation of the hydraulic oil thermo valve and the torque converter oil thermo valve is not limited to be performed by a wax-type thermo sensor using thermo wax, but is a shape memory alloy, thermostat, semiconductor temperature sensor, etc. that is sensitive to temperature. You may comprise so that it may be performed with the temperature measuring body using.

  Not only are both the hydraulic oil thermo valve and the torque converter oil thermo valve provided on the upstream side of the radiator thermo valve, the torque converter oil thermo valve may be omitted, and further, the hydraulic oil thermo valve may be omitted. Alternatively, one of the thermoelectric valves for torque converter oil may be interposed.

  In addition, the hydraulic oil thermo valve and the torque converter oil thermo valve described in the claims are not only completely shut off but also provided with a variable throttle substantially equal to the shut-off in the pilot passage 37. Such cases are also included.

1 is a circuit diagram showing a hydraulic fan drive device according to an embodiment of the present invention. FIG. It is a longitudinal cross-sectional view which shows the relief valve with which the thermo valve for hydraulic oil was assembled | attached. It is a longitudinal cross-sectional view which shows the thermo valve for radiators. It is a longitudinal cross-sectional view which shows the switching state.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Tank, 2 ... Engine, 3 ... Hydraulic pump, 4 ... Intake side oil path, 5 ... Discharge side oil path, 6 ... Fan, 7 ... Hydraulic motor, 8 ... Outlet side oil path, 9 ... Bypass path, 10 ... Radiator, 11 ... Torcon oil cooler, 12 ... Oil cooler, 13 ... Filter, 14 ... Relief valve for filter, 15 ... Relief valve, 15A ... Valve unit, 16 ... Body, 17 ... Inlet port, 18 ... Outlet port, 19 ... Outlet port, 20 ... Inlet port, 21 ... Valve chamber, 22 ... Valve, 23 ... Valve, 24 ... Valve seat, 25 ... Valve, 26 ... Spring, 27 ... Communication hole, 28 ... First throttle valve, 29 , Throttle, 30, pilot passage, 31, pilot valve, 32, valve chamber, 33, valve seat member, 34, valve body, 35, spring seat, 36, valve spring, 37, pilot passage, 38, control port, 39 ... Radi Thermo-valve for water (thermo-sensing valve for water temperature), 40 ... Pressure control valve (valve), 41 ... Body, 42 ... Valve chamber, 43 ... Female thread, 44 ... Plug, 45 ... Inlet port, 46 ... Outlet port, 47 ... Valve barrel, 48 ... Valve path, 49 ... Valve seat, 50 ... Poppet (valve element), 51 ... Spring seat (poppet side seat), 52 ... Seat portion, 53 ... Valve spring, 54 ... Spring seat (sensor side seat) ), 55 ... Valve spring seat, 56 ... Return spring seat, 57 ... Return spring, 58 ... Head, 59 ... Female screw hole, 60 ... Wax-type thermosensor (sensor), 61 ... Holder, 62 ... Male screw 63, seal ring, 64 ... piston, 65 ... conical shaped part, 66 ... cover, 67 ... cup, 68 ... wax, 70 ... thermo valve for hydraulic oil ( Thermo-sensing valve for hydraulic oil), 71 ... Valve chamber, 72 ... Spool valve element, 73 ... Spring, 74 ... Sensor for hydraulic oil (wax-type thermo sensor), 75 ... Bypass passage, 80 ... Thermo valve for torque converter oil (Torcon) Oil thermo-sensing valve), 81 ... Torcon oil sensor (wax-type thermo sensor), 82 ... Relief valve, 83 ... Oil passage, 84 ... Oil passage.

Claims (4)

A hydraulic motor that drives a fan; a hydraulic pump that pumps hydraulic oil sucked from a tank to the hydraulic motor; and the hydraulic motor between a discharge-side oil passage of the hydraulic pump and an outlet-side oil passage of the hydraulic motor. A bypass path connected to bypass, a relief valve interposed in the bypass path, a control pilot path branched from the relief valve and connected to the tank, and the hydraulic pump connected to the pilot path In the hydraulic fan drive device comprising a water temperature thermosensing valve that controls the discharge pressure in accordance with the cooling water temperature of the radiator,
A hydraulic fan driving device, wherein a hydraulic oil thermosensing valve that detects the temperature of the hydraulic oil and blocks the pilot passage at a high temperature is interposed upstream of the water temperature thermosensing valve.   The hydraulic fan drive device according to claim 1, wherein the hydraulic oil thermosensing valve is assembled to the hydraulic motor or the hydraulic pump.   A thermosensing valve for torque converter that detects the temperature of hydraulic oil used in the torque converter and connects the relief valve to the tank side at a high temperature is interposed upstream of the water temperature thermosensing valve. The hydraulic fan drive device according to claim 1 or 2, characterized in that A hydraulic motor that drives a fan; a hydraulic pump that pumps hydraulic oil sucked from a tank to the hydraulic motor; and the hydraulic motor between a discharge-side oil passage of the hydraulic pump and an outlet-side oil passage of the hydraulic motor. A bypass path connected to bypass, a relief valve interposed in the bypass path, a control pilot path branched from the relief valve and connected to the tank, and the hydraulic pump connected to the pilot path In the hydraulic fan drive device comprising a water temperature thermosensing valve that controls the discharge pressure in accordance with the cooling water temperature of the radiator,
A hydraulic pressure sensing valve for detecting the temperature of hydraulic oil used in the torque converter and shutting off the pilot passage at a high temperature is interposed upstream of the water temperature thermosensing valve. Fan drive device.

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