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1. 发明专利

JPH04126965A PROTECTION DEVICE OF FREEZING CYCLE 失效
公开(公告)号：JPH04126965A
公开(公告)日：1992-04-27
申请号：JP24761690
申请日：1990-09-19
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： KURITA YASUHIRO , SHIMANE HIROMI , SAKUMA MORIYUKI , TANMACHI TAKESHI , FUNAKI ISAMU
IPC分类号： F25B49/02
摘要： PURPOSE:To provide a small-sized, light weight and cost reduced protection device and prevent some cyclic parts from being damaged by a method wherein a fuse metal for shielding an inner part of cycle against a surrounding air and sealingly closing the inner part of cycle is disposed inside a pressure switch or a part of a body. CONSTITUTION:Refrigerant in a cycle is sealingly closed by a diaphragm 4 within a pressure switch, a fuse metal 5 adhered and fixed to the diaphragm and a packing 103. The fuse metal 5 is melted in the event that a refrigerant temperature reaches an abnormal high temperature of more than 100 deg.C. The refrigerant passes through a hole 401 of the diaphragm and a hole 601 if a reversing plate. The refrigerant leaks into the pressure switch and further leaks out into the surrounding air from a hole 11a of an adjusting screw. A high pressure of a cycle is prevented and a damage of an air conditioner cyclic parts is prevented. As the pressure in the cycle is abnormally increased during an operation of an air conditioner, the reversing plate 6 is reversed with the refrigerant pressure to push up an operating rod 12 and further to push a switch lever 705. High pressure terminals 703 and 704 are moved away from each other, the air conditioner is stopped and then the damage of the component parts is prevented.

2. 发明专利

JPH02104995A PROTECTOR FOR COMPRESSOR 失效
公开(公告)号：JPH02104995A
公开(公告)日：1990-04-17
申请号：JP25715888
申请日：1988-10-14
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： KURITA YASUHIRO , SAYO KOSAKU
IPC分类号： F04B39/00 , F04B49/10
摘要： PURPOSE:To keep off any damage to a compressor due to nonconformity in a refrigerating cycle by installing a pressure switch, detecting refrigerant pressure in the compressor, in conjunction with an electromagnetic sensor part which generates a pulse signal in a detected element with rotation of a drive circuit of the compressor and detects its rotational frequency. CONSTITUTION:A detector 1 of a protector for a compressor is provided with a movable rotation detector 2 held by an elastic bellows 3. This rotation detector 2 has a permanent magnet 201, a rotation detecting coil 203 and an iron core 204, and a movable pin 4 is set up in the center. A reversing plate 6 at the bellows side and a low pressure detecting spring 5 at the opposite side press a movable piece 502. The detector 1 is adjacently attached to a high pressure chamber of the compressor, detecting a detected element of a compressor shaft and generating a pulse. On the other hand, a switch of an electromagnetic clutch comes to OFF by pushing force at time of nonpressure in the high pressure chamber and to ON by pushing force of the bellows 3 at time of normal pressure respectively. At time of abnormally high pressure, the reversing plate 6 pushes the pin 4 upward and the switch is turned off. Thus, the compressor is protected from this abnormally high pressure in a refrigerating cycle and a gas non-sealing state.

3. 发明专利

JPS62184232A PROTECTIVE DEVICE FOR SOLENOID CLUTCH FOR CAR AIR CONDITIONER 失效
公开(公告)号：JPS62184232A
公开(公告)日：1987-08-12
申请号：JP2380286
申请日：1986-02-07
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： HAYASHI MORIKAZU , KURITA YASUHIRO
IPC分类号： F16D48/06 , F16D27/14
摘要： PURPOSE:To prevent damage of a clutch by instantaneously detecting slippage on a friction surface of a solenoid clutch to cut off an electric current applied to an exciting coil at the time of abnormality such as seizure of a compressor or the like. CONSTITUTION:Normally a rotor projection 10 and a disc projection 12 are rotated as they confront with each other. When abnormality such as seizure of a compressor or the like occurs, slippage occurs between a rotor 1 and a disc 3, so that the rotor projection 10 and the disc projection 12 are shifted from the confronting position. There causes a change in magnetic flux of a closed magnetic circuit S2 formed by the rotor 1, the rotor projection 10, the disc projection 12, a compressor rotary shaft 8 side and a driver 5 (compressor). Such change is detected by an abnormality detecting coil 6 of a magnetic flux change detecting member, and in response to the detection signal, an electric current applied to an exciting coil 2 is cut off. Accordingly, damage of a clutch and bad influence of heat on a rotor bearing can be reduced remarkably.

4. 发明专利

JPS62171530A CONTROL DEVICE FOR ELECTROMAGNETIC CLUTCH 失效
公开(公告)号：JPS62171530A
公开(公告)日：1987-07-28
申请号：JP1196386
申请日：1986-01-24
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： KURITA YASUHIRO , SAYO KOSAKU
IPC分类号： F16D48/06
摘要： PURPOSE:To avoid clutch slip and to reliably accomplish transmission by changing transmission torque of an electromagnetic clutch according to a change of driving torque of driven equipment to transmit power. CONSTITUTION:The rotational frequency of a driving shaft and a driven shaft is detected by rotation detectors 8, 7, the detected rotational frequency is compared and computed by a decision circuit 9 to decide ON and OFF of the current application time. A voltage control circuit 10 controls applied voltage according to an output of the decision circuit 9. That is, as it can be known whether the driving force is transmitted to the driven shaft or not by comparison of the rotational frequency of the driving shaft and the driven shaft, the existence/absence of clutch slip can be judged to suitably control an electromagnetic clutch.

5. 发明专利

JPS60228792A COMPRESSOR 失效
公开(公告)号：JPS60228792A
公开(公告)日：1985-11-14
申请号：JP8380584
申请日：1984-04-27
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： KURITA YASUHIRO , SUGINUMA ATSUSHI , KISHI ATSUO , HAYASE ISAO , TAKAHASHI YUKIO
IPC分类号： F04C18/352 , F01C21/08 , F04C29/00
摘要： PURPOSE:To effectively lubricate and cool a vane driving mechanism, a bearing part and a shaft seal by making both intake refrigerant gas and lubricating oil to pass through the inside of the rotor of a vane type compressor. CONSTITUTION:Both refrigerant gas and lubricating oil run into a low-pressure chamber 153 from the intake port 154 of a cover 15 in which the most of the lubricating oil remains due to rapid change of a main stream intake passage formed inside the cover 15, while the refrigerant gas including a little of lubricating oil is sucked into a working chamber from the main stream side intake port 3. On the other hand, the refrigerant gas etc. flows also into a sub stream port, passes through the bearing part 6 of a side plate 4, the vane driving mechanism of a rotor 1 and the bearing part 7 of the side plate in order and then sucked into a compression chamber from the sub stream side intake port 401.

6. 发明专利

JPS6353323A ROTATIONAL FREQUENCY DETECTING DEVICE FOR COMPRESSOR 失效
公开(公告)号：JPS6353323A
公开(公告)日：1988-03-07
申请号：JP19549686
申请日：1986-08-22
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： YAMAZAKI TOSHIO , SAYO KOSAKU , TEJIMA KUNIAKI , KURITA YASUHIRO
IPC分类号： F16D27/14
摘要： PURPOSE:To aim at improvement of the accuracy of detecting the rotational frequency of a compressor through increasing the detection voltage by reducing a very small clearance between the inner periphery surface of a rotating disc and the outer periphery surface of a hub so as to increase the by-pass magnetic flux in an auxiliary closed magnetic circuit. CONSTITUTION:When a compressor 1 is in rotary action, an exciting coil 5b is electrified, and a main closed magnetic circuit A is generated to cause an output disc 8c to be attracted to an input rotor 7. In addition, some of the magnetic flux in the exciting coil 5b bypass the main closed magnetic circuit A so as to form an auxiliary closed magnetic circuit B. In this condition, when a magnetic piece 12b in a magnetic flux changing means 12 passes through the neighborhood of the magnetic pole 11, a clearance between the magnetic pole 11 and the magnetic flux changing means 12 is reduced to cause the by-pass magnetic flux to be increased. Since the pulsative change in a flux output in the auxiliary closed magnetic circuit B is detected by a magnetic detecting coil 14, if the by-pass magnetic flux is increased, the induced pulse voltage generated in the magnetic detecting coil 14 is also increased.

7. 发明专利

JPS60164018A SOLENOID CLUTCH 失效
公开(公告)号：JPS60164018A
公开(公告)日：1985-08-27
申请号：JP1524184
申请日：1984-02-01
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： KURITA YASUHIRO , TEJIMA KUNIAKI , DEGAWA TAKU
IPC分类号： F16D48/06 , F16D27/112
摘要： PURPOSE:To eliminate slip of a clutch by changing-over an individual operation of an exciting coil to parallel operation at the rotational frequency about torsional resonance point of a shaft. CONSTITUTION:When an electric current is applied to an exciting coil 4, a starting exciting coil 401 and an steady-state exciting coil 402 are operated parallel, and a close magnetic path S is formed among a stator 1, an input rotor 2 and an armature 10, thereby to generate sucking force between a friction plate 204 of the input rotor 2 and the armature 10, so that the armature 10 is adsorbed to the friction plate 204 against the force of a plate spring 902. When the starting state is completed, only a steady-state exciting coil 402 is individually operated by a delay circuit 13, so that the turning force of the armature 10 is transmitted to a rotary shaft 8 through a plate spring 902, an output rotor 901 and a hub 9.

8. 发明专利

JPH0471923A RECEIVER FOR AUTOMOBILE 失效
公开(公告)号：JPH0471923A
公开(公告)日：1992-03-06
申请号：JP18396190
申请日：1990-07-13
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： OHASHI KATSUHIDE , TANMACHI TAKESHI , WAKAIRO SEIICHI , KURITA YASUHIRO
IPC分类号： F25B43/00 , B60H1/32
摘要： PURPOSE:To eliminate a gas lock phenomenon appearing at the time of a sudden change in coolant flowrate by providing a continuity tube for keeping direct continuity between the upstream and downstream sides of a disicant in the constitution wherein the disicant is supported with plate like upper and lower brackets having a strainer function at the center of a receiver. CONSTITUTION:In a refrigeration cycle receiver 1, a coolant enters the inlet 2 of a body 8, and is reserved on the bottom section of a shell 9 via a strainer 4 and a desicant 5. The coolant reserved on the aforesaid bottom section flows from a suction pipe 6 to an expansion valve via the outlet 3 of the body 8. In this case, a continuity tube 10 is provided to keep continuity between the upper and lower sides of the strainer 4. According to the aforesaid construction, the coolant from the inlet 2 cannot instantaneously pass, due to the resistance body of the strainer 4 and desicant 5, when there is a sudden fluctuation in coolant flowrate, thereby preventing the occurrence of a gas lock phenomenon where the coolant stagnates above the strainer 4 and hardly flows down.

9. 发明专利

JPH0266324A ELECTROMAGNETIC CLUTCH 失效
公开(公告)号：JPH0266324A
公开(公告)日：1990-03-06
申请号：JP21498488
申请日：1988-08-31
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： SAYO KOSAKU , HAMADA HARUKI , KURITA YASUHIRO , YAMAZAKI TOSHIO
IPC分类号： F04B35/00 , F16D27/112
摘要： PURPOSE:To improve the machining ability of the shaft engaging hole of a hub so as to improve the productivity of an electromagnetic clutch by using a part of a plate spring which forms an output rotor as a stopper for fixing the output rotor in its axial direction. CONSTITUTION:In an electromagnetic clutch, when an electric current flows into an exciter 12, magnetic flux is generated along a main magnetic circuit which is stated by a broken line. And a movable piece 8 is adsorbed into an input rotor 2, and torque exerted upon the input rotor 2 is transmitted to a hub 9, a key 21 and a shaft 20 in order through a plate spring 10 so as to rotate a compressor 1. Then when the electric current is checked, the magnetic flux disappears and the movable piece 8 is retreated toward the opposite side of the input rotor due to the spring force of the plate spring 10, so that a power transmission to the shaft 20 is interrupted. In this case, since the disc portion 10a of the plate spring 10 is used as a stopper 10f for fixing an output rotor 7 in its axial direction, a special part such as a washer or the like which is used as a stopper does not become necessary. As a result, the part cost and the installation cost of the electromagnetic clutch concerned can be reduced.

10. 发明专利

JPS61212768A REVOLUTIONS DETECTOR FOR COMPRESSOR 失效
公开(公告)号：JPS61212768A
公开(公告)日：1986-09-20
申请号：JP5230785
申请日：1985-03-18
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： YAMAZAKI TOSHIO , KURITA YASUHIRO , TEJIMA KUNIAKI
IPC分类号： F04B39/00 , B60H1/32 , F04B35/00 , F04B49/00 , F04B49/10 , F04B51/00 , F04D27/00 , G01P3/481
摘要： PURPOSE:To eliminate the need for a bracket for supporting a sensor as well as a countermeasure against possible refrigerant leakage, by arranging a revolutions detecting section comprising a rotor detecting section and a sensor detector section at a portion on the inner surface side from the bearing layout position. CONSTITUTION:As a exciting coil 6 is energized, a magnetic circuit is formed between a stator yoke 14, an input rotor 5 and a rotary disc 18 to attract the disc 18 on the rotor 5. The rotating force from a driving source enters from a drive belt 4 to be transmitted to a rotating shaft 2 via the rotor 5, the disc 18 and an output rotor 3. Then, the revolutions are detected with a revolutions detecting section 21 comprising the end face of a hub 11 on the inner surface side of a bearing 12 and a rotary sensor 7. In this manner, a revolutions detector for a compressor is arranged inside a bearing layout position of an electromagnetic clutch thereby eliminating any bracket and there is no detector section provided inside the compressor thereby eliminating any counter-measure against possible refrigerant leakage.

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