CA2042688A1 - High pressure sensor - Google Patents
High pressure sensorInfo
- Publication number
- CA2042688A1 CA2042688A1 CA 2042688 CA2042688A CA2042688A1 CA 2042688 A1 CA2042688 A1 CA 2042688A1 CA 2042688 CA2042688 CA 2042688 CA 2042688 A CA2042688 A CA 2042688A CA 2042688 A1 CA2042688 A1 CA 2042688A1
- Authority
- CA
- Canada
- Prior art keywords
- sensor
- cup
- diaphragm
- shaped member
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 239000003351 stiffener Substances 0.000 abstract description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 230000005405 multipole Effects 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/08—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically
- G01L23/10—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically by pressure-sensitive members of the piezoelectric type
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
ABSTRACT
HIGH PRESSURE SENSOR
A pressure sensor for a vehicle engine cylinder head has a thin walled cup-shaped member 1 providing a diaphragm 2 and sealed at 3 by a sealing washer 6. An inner sleeve 7 acts as a stiffener for the cup-shaped member 1, as a guide for a push rod 8 and as a heat sink for sinking heat from the diaphragm into the cylinder head of the engine.
HIGH PRESSURE SENSOR
A pressure sensor for a vehicle engine cylinder head has a thin walled cup-shaped member 1 providing a diaphragm 2 and sealed at 3 by a sealing washer 6. An inner sleeve 7 acts as a stiffener for the cup-shaped member 1, as a guide for a push rod 8 and as a heat sink for sinking heat from the diaphragm into the cylinder head of the engine.
Description
~ ~2~
S K Glanfield - 1 HIGH PRESSURE SENSOR
This invention relates to a high pressure sensor particularly but not exclusively for measuring the pressure in a cylinder head of an internal combustion engine.
A typical cylinder head pressure sensor is described in US Patent No, 4,586,018. This sensor comprises a tubular body on one end of which a pressure responsive disphragm is mounted. Movement of this diaphragm in response to an applied pressure is transmitted to a second diaphragm via a fluid contained in the tubular body.
It has been found that sensors of this type are difficult to manufacture as it is necessary to provide an effective seal between the diaphragm and the tubular body. Typically this is effected by laser welding, but this is of course a time consuming precision operation. As a result the sensor is relatively costly to manufacture.
It is an object of the present invention to provide a pressure sensor which is simple to manufacture and reliable in operation.
S K Glanfield - 1 HIGH PRESSURE SENSOR
This invention relates to a high pressure sensor particularly but not exclusively for measuring the pressure in a cylinder head of an internal combustion engine.
A typical cylinder head pressure sensor is described in US Patent No, 4,586,018. This sensor comprises a tubular body on one end of which a pressure responsive disphragm is mounted. Movement of this diaphragm in response to an applied pressure is transmitted to a second diaphragm via a fluid contained in the tubular body.
It has been found that sensors of this type are difficult to manufacture as it is necessary to provide an effective seal between the diaphragm and the tubular body. Typically this is effected by laser welding, but this is of course a time consuming precision operation. As a result the sensor is relatively costly to manufacture.
It is an object of the present invention to provide a pressure sensor which is simple to manufacture and reliable in operation.
2~ 2~
SUMMARY OF THE INVENTION
According to the present invention there is provided a high pressure sensor comprising a thin walled cup-shaped member providing a diaphragm at its closed end for sensing pressure, a sleeve supporting the wall of the cup-shaped member against collapse under said pressure, and a force transfer arrangement for coupling the diaphragm with a force transducer to provide an output signal representative of the pressure sensed by the diaphragm.
Conveniently, where the force transfer arrangement comprises a simple push rod then the sleeve can act as a guide for the push rod at its end remote from the diaphragm.
Preferably the sensor comprises a hollow body which is secured and sealed to the open end of the cup-shaped member at a projecting annular rim, preferably by a securing and sealing washer, which rim or washer also serves as a mounting rim to mount and to seal the sensor in an aperture in use of the sensor.
Conveniently the cup shaped member is drawn from a single gland of metal and has a thickness of about five thousandths of an inch.
BRIEF DESCRIPTION OF THE DRAWINGS
In order that the invention can be more clearly understood reference will now be made to the accompanying drawing which is an axial cross-section of a high pressure sensor according to an embodiment of the present invention.
2~2~$~
DESCRIPTION OF PREFERRED EMBODIMENT
Referring to the drawing, t'ne sensor comprises a hollow thin-=walled cup-shaped part 1 formed from stainless steel (preferably a grade of stainless steel having a long fatigue life) and formed as a diaphragm 2 at its closed end and formed with a flared end 3 at its open end. A body 4 comprises a tube of stainless steel formed with a flared end 5, and the flared ends 3 and 5 are secured together by an annular cup washer 6 of malleable metal such as copper and which acts as a securing/sealing washer.
Fitted inside the cup-shaped member 1 is a push rod guide/heat sink 7 formed by a copper sleeve.
This sleeve also serves the function of a stiffener protecting the thin wall of the cup-shaped member 1 from collapse and damage.
Within the sleeve 7 is a push rod 8 having a head 9 in intimate contact with the underside of the diaphragm 2 and at the other end 10 is in intimate contact with a force transducer in the form of an etched silicon sensor element 11 supported at its underside peripheral region only on a plastic bodied socket 12.
This peripheral support region is formed by recessing the main underside central area of the silicon sensor element 11.
The silicon sensor element is held down mechanically and connected electrically by small legs 13 which project out of the connector body and extend back down onto metallised pads on the silicon sensor.
When pressure is applied to the diaphragm 2 force is transferred by the force transfer push rod 8 to the silicon sensor which is slightly bent and this deflection causes the silicon sensor to provide an electrical output at the connection legs.
In use of the sensor a multi-pole socket 14 fits into the back of the body and plugs into the plug 12, thus making electrical connection with the silicon sensor so that the output signal from the sensor can be transferred to an engine management system in the vehicle.
In a variant of the sensor, this socket can contain a signal conditioning amplifier circuit, to increase the output level thereby reducing pick up of extraneous electrical noise in the wiring loom of the vehicle.
The connector plug is retained within the stainless steel body 4 by a groove 12A into which is deformed a corresponding groove 4A formed in the stainless steel body. Positioning of the silicon sensor is important and a small pre-load is applied to ensure there is a pre deflection of the diaphragm preventing hysteresis which might otherwise occur due to freedom of movement on the push rod 8. Further details are shown in our co-pending application 2211659A.
A locking screw 15 is located over the stainless steel body 4 and butts up against the securing/sealing washer 6. This locking screw is captive but loose on the sensor by means of a locking screw retainer 16 which is spot welded onto the body 4.
When the sensor is fitted into an appropriate aperture in the cylinder head of a motor vehicle engine, the locking screw is used to tighten the sensor into the tapped aperture in the cylinder head. The securing/sealing washer 6 acts in a similar way to the ~2~
washer on a spark plug, and seals the diaphragm into the block by sealing the cup-shaped body l at the washer 60 If it is necessary to remove the sensor from the cylinder head, then the locking screw is unscrewed and the locking screw retainer 16 acts as a jacking device to withdraw the complete sensor from the cylinder head.
The cup-shaped member 1 has a nominal draught angle of about one degree to assist in the removal of the sensor from the head in the presence of for example carbonisation. The sleeve 7 has a corresponding taper and is firmly locked in the member l.
The member l has a thickness of about 5 thousandths of an inch. It could be as think as 4 thousandths of an inch but probably not thicker than 8 thousandths of an inch. It is drawn from a single blank so that it is of unitary construction and this enables a cost-effective product to be made.
At its rear end the locking screw 15 has a transverse slot so that a special tool similar to a screwdriver with a slot in the middle of the blade~ can be used to tighten and untighten the locking screw.
SUMMARY OF THE INVENTION
According to the present invention there is provided a high pressure sensor comprising a thin walled cup-shaped member providing a diaphragm at its closed end for sensing pressure, a sleeve supporting the wall of the cup-shaped member against collapse under said pressure, and a force transfer arrangement for coupling the diaphragm with a force transducer to provide an output signal representative of the pressure sensed by the diaphragm.
Conveniently, where the force transfer arrangement comprises a simple push rod then the sleeve can act as a guide for the push rod at its end remote from the diaphragm.
Preferably the sensor comprises a hollow body which is secured and sealed to the open end of the cup-shaped member at a projecting annular rim, preferably by a securing and sealing washer, which rim or washer also serves as a mounting rim to mount and to seal the sensor in an aperture in use of the sensor.
Conveniently the cup shaped member is drawn from a single gland of metal and has a thickness of about five thousandths of an inch.
BRIEF DESCRIPTION OF THE DRAWINGS
In order that the invention can be more clearly understood reference will now be made to the accompanying drawing which is an axial cross-section of a high pressure sensor according to an embodiment of the present invention.
2~2~$~
DESCRIPTION OF PREFERRED EMBODIMENT
Referring to the drawing, t'ne sensor comprises a hollow thin-=walled cup-shaped part 1 formed from stainless steel (preferably a grade of stainless steel having a long fatigue life) and formed as a diaphragm 2 at its closed end and formed with a flared end 3 at its open end. A body 4 comprises a tube of stainless steel formed with a flared end 5, and the flared ends 3 and 5 are secured together by an annular cup washer 6 of malleable metal such as copper and which acts as a securing/sealing washer.
Fitted inside the cup-shaped member 1 is a push rod guide/heat sink 7 formed by a copper sleeve.
This sleeve also serves the function of a stiffener protecting the thin wall of the cup-shaped member 1 from collapse and damage.
Within the sleeve 7 is a push rod 8 having a head 9 in intimate contact with the underside of the diaphragm 2 and at the other end 10 is in intimate contact with a force transducer in the form of an etched silicon sensor element 11 supported at its underside peripheral region only on a plastic bodied socket 12.
This peripheral support region is formed by recessing the main underside central area of the silicon sensor element 11.
The silicon sensor element is held down mechanically and connected electrically by small legs 13 which project out of the connector body and extend back down onto metallised pads on the silicon sensor.
When pressure is applied to the diaphragm 2 force is transferred by the force transfer push rod 8 to the silicon sensor which is slightly bent and this deflection causes the silicon sensor to provide an electrical output at the connection legs.
In use of the sensor a multi-pole socket 14 fits into the back of the body and plugs into the plug 12, thus making electrical connection with the silicon sensor so that the output signal from the sensor can be transferred to an engine management system in the vehicle.
In a variant of the sensor, this socket can contain a signal conditioning amplifier circuit, to increase the output level thereby reducing pick up of extraneous electrical noise in the wiring loom of the vehicle.
The connector plug is retained within the stainless steel body 4 by a groove 12A into which is deformed a corresponding groove 4A formed in the stainless steel body. Positioning of the silicon sensor is important and a small pre-load is applied to ensure there is a pre deflection of the diaphragm preventing hysteresis which might otherwise occur due to freedom of movement on the push rod 8. Further details are shown in our co-pending application 2211659A.
A locking screw 15 is located over the stainless steel body 4 and butts up against the securing/sealing washer 6. This locking screw is captive but loose on the sensor by means of a locking screw retainer 16 which is spot welded onto the body 4.
When the sensor is fitted into an appropriate aperture in the cylinder head of a motor vehicle engine, the locking screw is used to tighten the sensor into the tapped aperture in the cylinder head. The securing/sealing washer 6 acts in a similar way to the ~2~
washer on a spark plug, and seals the diaphragm into the block by sealing the cup-shaped body l at the washer 60 If it is necessary to remove the sensor from the cylinder head, then the locking screw is unscrewed and the locking screw retainer 16 acts as a jacking device to withdraw the complete sensor from the cylinder head.
The cup-shaped member 1 has a nominal draught angle of about one degree to assist in the removal of the sensor from the head in the presence of for example carbonisation. The sleeve 7 has a corresponding taper and is firmly locked in the member l.
The member l has a thickness of about 5 thousandths of an inch. It could be as think as 4 thousandths of an inch but probably not thicker than 8 thousandths of an inch. It is drawn from a single blank so that it is of unitary construction and this enables a cost-effective product to be made.
At its rear end the locking screw 15 has a transverse slot so that a special tool similar to a screwdriver with a slot in the middle of the blade~ can be used to tighten and untighten the locking screw.
Claims (6)
1. A high pressure sensor comprising a thin walled cup-shaped member providing a diaphragm at its closed end for sensing pressure, a sleeve supporting the wall of the cup-shaped member against collapse under said pressure, and a force transfer arrangement for coupling the diaphragm with a force transducer to provide an output signal representative of the pressure sensed by the diaphragm.
2. A sensor as claimed in claim 1, characterised in that said force transfer arrangement comprises a push rod which is guided by said sleeve at its end remote from the diaphragm.
3. A sensor as claimed in claim 2, comprising a hollow body which is secured and sealed to the open end of the cup-shaped member by a securing and sealing washer which also serves to seal the sensor in an aperture in use of the sensor.
4. A sensor as claimed in claim 3, wherein said cup-shaped member has a wall thickness in the range of 4-8 thousandths of an inch.
5. A sensor as claimed in claim 4, wherein said cup-shaped member has been drawn from a blank.
6. A sensor as claimed in claim 5, and having a locking screw captive but loose on the sensor for securing the sensor in an aperture in a cylinder head.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9011694.8 | 1990-05-24 | ||
| GB9011694A GB2244335B (en) | 1990-05-24 | 1990-05-24 | High pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2042688A1 true CA2042688A1 (en) | 1991-11-25 |
Family
ID=10676535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2042688 Abandoned CA2042688A1 (en) | 1990-05-24 | 1991-05-15 | High pressure sensor |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH04231833A (en) |
| CA (1) | CA2042688A1 (en) |
| DE (1) | DE9105885U1 (en) |
| GB (1) | GB2244335B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021068475A1 (en) * | 2019-10-09 | 2021-04-15 | 珠海市舒丽玛温控卫浴设备有限公司 | Thermosensitive element |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5606117A (en) * | 1991-02-27 | 1997-02-25 | Robert Bosch Gmbh | Pressure sensor for measuring pressure in an internal combustion engine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6073428A (en) * | 1983-09-19 | 1985-04-25 | フオ−ド モ−タ− カンパニ− | Combustion pressure sensor |
| AT386482B (en) * | 1985-03-05 | 1988-08-25 | Avl Verbrennungskraft Messtech | PRESSURE SENSOR |
| GB2211659B (en) * | 1987-10-24 | 1991-01-09 | Stc Plc | Pressure sensor |
-
1990
- 1990-05-24 GB GB9011694A patent/GB2244335B/en not_active Expired - Fee Related
-
1991
- 1991-05-13 DE DE9105885U patent/DE9105885U1/en not_active Expired - Lifetime
- 1991-05-15 CA CA 2042688 patent/CA2042688A1/en not_active Abandoned
- 1991-05-24 JP JP14818491A patent/JPH04231833A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021068475A1 (en) * | 2019-10-09 | 2021-04-15 | 珠海市舒丽玛温控卫浴设备有限公司 | Thermosensitive element |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2244335A (en) | 1991-11-27 |
| DE9105885U1 (en) | 1991-07-25 |
| JPH04231833A (en) | 1992-08-20 |
| GB9011694D0 (en) | 1990-07-11 |
| GB2244335B (en) | 1994-03-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7829824B2 (en) | Pressure pickup heating bar, in particular for a pressure pickup glow plug | |
| US4296887A (en) | Heat protected fuel injection plug for internal combustion engines | |
| US5101659A (en) | Mounting device for pressure sensor | |
| GB2100002A (en) | Fluid pressure sensors | |
| EA004581B1 (en) | Pressure measuring arrangement | |
| JP4062263B2 (en) | Temperature sensor | |
| EP0922945B1 (en) | Pressure sensor | |
| US4392082A (en) | Pressure-sensitive ignition plug | |
| JP2006250614A (en) | Pressure detector | |
| US4755637A (en) | Proximity switch for detecting a piston position in a pressure cylinder | |
| JPH0254637B2 (en) | ||
| CA2042688A1 (en) | High pressure sensor | |
| JP2017187411A (en) | Pressure sensor | |
| US6006610A (en) | Arrangement of a sensor housing on a wall | |
| US4796464A (en) | Electronic oil pressure sensor device | |
| US7222516B2 (en) | Gas sensor, gas sensor cap, and gas sensor unit | |
| JP3260597B2 (en) | Plug with pressure sensor | |
| US4506186A (en) | Spark plug and optical combustion sensor combination | |
| JPH01250732A (en) | Pressure sensor | |
| CN212304954U (en) | Heat insulation device for motor set | |
| JP2645475B2 (en) | Semiconductor type pressure detector | |
| CZ194196A3 (en) | Sensing unit with pressure casing, particularly for vibration pick-up | |
| US4647934A (en) | Multistage extensible rod antenna | |
| JP4049109B2 (en) | Pressure sensor | |
| JPH0749274A (en) | Semiconductor pressure sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |