JP4459010B2 - Double cylinder throttle body with pressure sensor - Google Patents

Description

  The present invention relates to a pressure sensor that detects a pressure change in an intake passage by replacing it with a voltage change, and particularly relates to a pressure sensor mounted on a multi-cylinder throttle body in which a plurality of intake passages are formed in a single throttle body. .

Conventionally, a double cylinder throttle body equipped with such a pressure sensor is already known from Japanese Patent Laid-Open No. 4-276127. This includes the coupling surface 17a of the body 14, the second groove 40 is provided, the intake passage 15 ₁ to 15 ₃ each second port 39 _{1-39 3} which opens to form a second communication passage 43 Are communicated with the second communication passage 43 in common. A connection pipe 41 is connected to the second communication path 43, and an intake pressure detector 42 is connected to the connection pipe. (The names and symbols used are those described in the publication)
FIG. 3 shows another conventional example. For this purpose, a first intake passage 31a and a second intake passage 31b are formed adjacent to each other in a single throttle body 30, and formed by a sensor housing and a pressure case, and a sensor chip is formed inside. The stored pressure sensor P is fixed to a vehicle body, an engine, etc. (not shown) via a stay S. Reference numeral 32 a denotes a first pressure detection port that opens to an intake passage 31 a 1 downstream from a first throttle valve (not shown). The first pressure detection port 32 a is a right horizontal pipe portion 33 a of the T-shaped joint 33. Is connected by a rubber hose R1. Reference numeral 32b denotes a second pressure detection port that opens to an intake passage 31b1 downstream of a second throttle valve (not shown). The second pressure detection port 32b is a left horizontal pipe of the T-shaped joint 33. The rubber hose R2 is connected to the portion 33b. Further, the pressure introducing cylinder portion 35 of the pressure sensor P in which the pressure introducing hole 34 connected to the inside of the pressure sensor P is formed and the vertical pipe portion 33c of the T-shaped joint 33 are connected by a rubber hose R3.
JP-A-4-276127

According to the one disclosed in Japanese Patent Laid-Open No. 4-276127, in the second communication passage 43, the second groove 40 is formed in the coupling surface 17a of the body 14, and the coupling surface 17a of the body 14 is connected to the intake manifold 7 via the gasket 28. It is formed by combining. According to this, the airtight guarantee of the second communication passage 43 can be finally confirmed after the body 14 and the intake manifold 7 are joined together, and the airtightness confirmation of the throttle body 14 when it is a single product cannot be performed. Further, in order to maintain the airtightness of the second communication passage 43, it is necessary to accurately form the flatness of the coupling surface of the throttle body 14 and the intake manifold 7. The pressure sensor 42 is disposed at a position away from the throttle body 14, and the second communication passage 43 of the throttle body 14 and the pressure sensor 42 are connected by a connecting pipe 41. According to this, each port 39 _{1 is connected.} ~ 39 ₃ passage volume of the pressure passage leading to the pressure sensor 42 worsens the response of the pressure sensor 42 increases from.

  Further, according to the conventional example shown in FIG. 3, the rubber hoses R1, R2, and R3 are required and their connecting action is required, and the manufacturing cost can be reduced by increasing the number of parts and assembling steps. Cannot be achieved. In addition, having the plurality of connection portions increases the number of airtightness assurance portions of the connection portions, and increases the number of steps for airtight test. Further, the rubber hoses R1, R2, and R3 require a relatively long passage length because the pressure sensor P is disposed at a position away from the throttle body 30, and this increases the volume of the passage. The responsiveness of the pressure sensor P is deteriorated.

  The present invention has been made in view of the above problems, and accurately transmits the negative pressure generated in the intake passage to the pressure sensor without time delay, thereby improving the accurate pressure detection and pressure response and reducing the number of parts. An object of the present invention is to provide a multi-cylinder throttle body including a pressure sensor that can reduce the manufacturing cost.

In order to solve the above problems, a multiple cylinder throttle body including a pressure sensor according to the present invention has a plurality of intake passages formed adjacent to each other in a single throttle body, and is disposed in each intake passage. In a multiple cylinder throttle body in which each intake passage is opened and closed synchronously by each throttle valve, the throttle body includes a passage boss that integrally connects upper walls of a plurality of adjacent intake passages, and a passage boss. A sensor insertion boss projecting to one side is integrally formed. The passage boss includes a pressure passage extending in a tangential direction of a plurality of intake passages from one end surface to the other end, and extending downward from the pressure passage. A plurality of pressure detection ports that are opened downstream of the throttle valves of the plurality of intake passages, and a pressure introduction hole that extends laterally from the pressure passage and opens into the sensor insertion boss, Before the passage An opening to the passageway boss end surface closed by a plug, a first feature in that a pressure sensor for detecting the pressure transmitted to the pressure introducing hole is attached to the sensor insertion boss.

Further, according to the present invention, a plurality of intake passages are formed adjacent to each other in a single throttle body, and the intake passages are opened and closed synchronously by the throttle valves arranged in the intake passages. In a multi-cylinder throttle body, the throttle body is integrally formed with a passage boss that integrally connects the upper walls of a plurality of adjacent intake passages, and a pressure case cylinder that projects from the passage boss to one side. The passage boss includes a pressure passage extending from one end surface to the other end in a tangential direction of the plurality of intake passages, and a plurality of pressure detection ports extending downward from the pressure passages and opening to the plurality of intake passages. A pressure introduction hole extending laterally from the pressure passage and opening into the pressure case tube portion, the opening of the pressure passage toward the end face of the passage boss is closed with a plug, and the pressure case In the cylinder, in the pressure introduction hole Pressure fitted position the sensor housing accommodating the sensor chip of the pressure sensor for detecting the to be reached, this sensor housing, a second that it has formed a coupler for projecting position the terminal connected to the pressure sensor integrated It is characterized by.

According to the present invention, in addition to the first or second feature, a plurality of intake passages are used as a pair of first and second intake passages arranged in parallel, and a first pressure detection opening to the first intake passage is provided. A third feature is that the distance from the port to the pressure introduction hole and the distance from the second pressure detection port that opens to the second intake passage to the pressure introduction hole are the same distance.

In addition to the third feature, the present invention further includes the first pressure detection port arranged closer to the second intake passage 2b than the center of the first intake passage 2a. A fourth feature is that the port is arranged closer to the first intake passage side than the center of the second intake passage .

Furthermore, in addition to the third feature, the present invention is configured so that the first pressure detection port and the second pressure detection port are directed downward in the gravitational direction from the position of the pressure introduction hole into the pressure passage 3. A fifth feature is that the first and second intake passages are opened.

According to the first feature of the present invention, in the plurality of intake passages, the negative pressure generated downstream from each throttle valve is transferred from the plurality of pressure detection ports opened to the plurality of intake passages to the pressure introduction holes via the pressure passages. The combined pressure introduced and introduced into the pressure introduction hole acts on the pressure sensor mounted on the sensor insertion boss through the sensor insertion boss . According to the above, the pressure detection port leading to the pressure sensor from the intake passage downstream from the throttle valve, pressure path, since all of the pressure introducing hole and the sensor insertion boss is formed on the throttle Bode, the pressure sensor from the pressure sensing port leading pathlength can be shortened, thereby it is possible to reduce the volume of the passage leading to the pressure sensor from the pressure sensing port, it can greatly improve the pressure response of the pressure sensors have. Further, since the pre-Symbol communication path it is all formed with a drilling or some cast hole in the throttle body can be carried airtightness test negative pressure passage separately state of the throttle body, that perform efficient hermetic assurance it can. In addition, according to the above, since the connecting pipe such as a pipe is not exposed outside the throttle body, the pipe connection work is not necessary and the appearance can be reduced in size. In particular, the throttle body is directly exposed to the atmosphere. It is preferable to employ it in a motorcycle. In addition, since connection pipes such as pipes, joints, and the like are not required, the number of parts and connection work are not required, and the manufacturing cost can be effectively reduced.

  Further, according to the second feature of the present invention, the pressure case cylinder corresponding to the pressure case of the pressure sensor is formed integrally with the throttle body, and the sensor housing including the sensor chip and the terminal faces the pressure case cylinder. The pressure sensor can be attached to the throttle body by tightly fitting and connecting. According to the above, in particular, since the pressure case cylinder as a part of the pressure sensor is integrally formed with the throttle body, the pressure sensor can be manufactured at a low cost, and the protrusion dimension of the pressure sensor with respect to the throttle body can be reduced. The height direction of the throttle body equipped with the sensor can be further reduced, and in particular, the mountability of the throttle body to a motorcycle can be improved.

According to the third aspect of the present invention, the plurality of intake passages are used as a pair of first and second intake passages arranged in parallel, and the pressure introduction is performed from the first pressure detection port opened in the first intake passage. Since the distance to the hole and the distance from the second pressure detection port opened to the second intake passage to the pressure introduction hole are the same distance, the negative pressure generated in both intake passages is synchronously It can act toward the introduction hole, whereby the negative pressure generated in each intake passage can be detected more accurately.

Further, according to a fourth aspect of the present invention, the first pressure detection port is arranged closer to the second intake passage side than the center of the first intake passage, and the second pressure detection port is In other words, since the first and second pressure detection ports are placed close to the pressure introduction hole side, the pressure from the first pressure detection port is increased. The distance to the introduction hole and the distance from the second pressure detection port to the pressure introduction hole can be shortened, so that the negative pressure generated in each intake passage can be applied to the pressure introduction hole without time delay. The negative pressure response speed of the pressure sensor could be increased, and according to the above, the length of the pressure passage itself could be further shortened to further reduce the volume of the pressure passage. This further improves the responsiveness of the pressure sensor. It can be.

Furthermore, according to the fifth aspect of the present invention, the first pressure detection port and the second pressure detection port are arranged so that the first and second pressure detection ports are directed downward in the gravitational direction from the opening position of the pressure introduction hole to the pressure passage. When the fuel injected into the intake passage downstream of the throttle valve is blown back by the intake air pulsation of the engine, it is blown back from the pressure detection port into the pressure introduction hole. There is no risk of fuel intrusion, and even if the fuel reaches the pressure introducing hole, the fuel is immediately discharged from the pressure detection port into the intake passage by its own weight. Therefore, the blown-back fuel does not affect the sensor chip of the pressure sensor, and the negative pressure in the intake passage can be detected stably and accurately.

An embodiment of a multiple cylinder throttle body having a pressure sensor according to the present invention will be described below with reference to FIG. Reference numeral 1 denotes a multi-cylinder throttle body having a first intake passage 2a and a second intake passage 2b formed therethrough, and each intake passage 2a, 2b is provided with a first and second intake passage (not shown). It is opened and closed by the throttle valve. The intake passage 2a1 downstream of the first throttle valve is connected to the engine via an intake pipe (not shown), and the intake passage 2b1 downstream of the second throttle valve is connected to the engine via an intake pipe (not shown). Connected to.
Further, each intake passage upstream of the first and second throttle valves is connected to an air cleaner via an air box (the above configuration is not shown ).

The throttle body 1 includes a passage boss 2c that integrally connects the upper walls 2a2 and 2b2 of the first and second intake passages 2a and 2b, and a sensor insertion boss 5 that protrudes upward from the passage boss 2c. The passage boss 2c is formed integrally with the pressure passage 3 extending from the right end surface to the other end in the tangential direction of the intake passages 2a, 2b, and the intake passages 2a, The first and second pressure detection ports 4a and 4b that open to the downstream side of the respective throttle valves 2b , and extend upward from the middle portion of the pressure passage 3 and open into the sensor insertion boss 5, that is, into the sensor insertion hole 6 A pressure introducing hole 7 is formed. Each pressure detection port 4a, 4b is provided with throttle parts 4a1, 4b1, respectively. The sensor insertion hole 6 is drilled downward from the upper end 5 a of the boss 5. The pressure introducing hole 7 is formed in the passage boss 2 c from the bottom of the sensor insertion hole 6 toward the pressure passage 3.

The opening of the pressure passage 3 to the end face of the passage boss 2 c is closed by a ball plug 17 .

P is a sensor housing 11 in which a sensor chip 8 is housed and disposed, and a terminal 9 connected to the sensor chip 8 projects into a coupler 10 that opens outward, and a pressure port 12 is opened. And a pressure case 14 having a pressure introducing cylinder portion 13 and hermetically closing a lower opening of the sensor housing 11. The pressure introducing cylinder portion 13 includes a pressure case 14. An attachment flange 11a that is inserted into the insertion hole 6 and extends laterally from the sensor housing 11 is disposed on an attachment boss 1a formed on the throttle body 1, and in this state, the attachment flange 11a is attached by a screw 15. The pressure sensor P is fixed to the throttle body 1 by being screwed to the boss 1a. Incidentally, 16 is a compressed state arranged O-ring between the pressure introducing tube portion 13 and the sensor insertion hole 6, 17 is a ball Rupuragu for closing the open end of the right side of the pressure passage 3.

  According to the double cylinder throttle body including the pressure sensor formed as described above, the negative pressure generated in the intake passage 2a1 downstream from the first throttle valve is the first pressure detection port 4a, the throttle portion 4a1, and the pressure passage. The negative pressure generated in the intake passage 2b1 downstream of the second throttle valve through the pressure introduction hole 7 via 3 is the pressure via the second pressure detection port 4b, the throttle portion 4b1, and the pressure passage 3. The pressure reaches the introduction hole 7, and the combined negative pressure of the two intake passages 2 a 1 and 2 b 1 is introduced into the sensor insertion hole 6 through the pressure introduction hole 7, and this negative pressure opens into the sensor insertion hole 6. It is introduced into the pressure sensor P via the pressure port 12. Therefore, the sensor chip 8 outputs an electric signal corresponding to the negative pressure introduced by the above-mentioned from the terminal 9 to, for example, an ECU disposed outside.

According to the above, since all the pressure passages including the first and second pressure detection ports 4a and 4b, the pressure passage 3, the pressure introduction hole 7 and the sensor insertion hole 6 are formed in the throttle body 1, these negative pressure passages are provided. Since the passage length of the (pressure passage) can be shortened and the negative pressure passage volume can be reduced, the pressure responsiveness of the pressure sensor P can be improved. In addition, according to the above, since all of the negative pressure passage (pressure passage) is formed in the throttle body 1, there is no need for a connecting pipe made of a joint, a rubber pipe or the like as in the prior art. In addition, the number of parts and pipe connection work are unnecessary, and the manufacturing cost can be greatly reduced. The sensor insertion hole 6 including the pressure passage 3 and the pressure introduction hole 7 can be formed by casting at the same time when the throttle body 1 is formed. In addition, the absence of a rubber pipe outside the throttle body 1 makes it possible to make the appearance of the throttle body 1 clean and achieve downsizing, and in particular, the throttle body is directly exposed to the atmosphere. Thus, it is possible to improve the mountability to a two-wheeled vehicle that is disposed and has a limited storage space. Further, when forming such a negative pressure passage (pressure passage), the air tightness of the negative pressure passage is particularly important, and all of the negative pressure passage is formed in the throttle body 1 as described above. Therefore, the airtightness of the negative pressure passage can be reliably ensured in the single state of the throttle body.

A second embodiment will be described with reference to FIG. Only the configuration different from FIG. 1 will be described, and the same reference numerals as those in FIG. 1 are used for the same configurations. Reference numeral 2a denotes a pressure case cylinder portion that protrudes upward from the passage boss 2c. A pressure chamber recess 20a is formed downward from the upper end of the pressure case recess 20a, and the pressure chamber recess 20a faces the pressure passage 3 from the bottom. Thus, the pressure introducing hole 7 is formed. The sensor housing 21 is formed by opening a lower opening 21a having a cylindrical shape toward the lower side, and a terminal 9 connected to the sensor chip 8 disposed inside the sensor housing 21 protrudes into a coupler 10 that opens to the side. Be placed. Then, the lower opening 21a of the sensor housing 21 is fitted and disposed toward the pressure case tube portion 20, and in this state, the plate 22 disposed on the upper bottom portion of the sensor housing 21 is screwed to the throttle body 1 by screws 23. The
Reference numeral 24 denotes an O-ring that is disposed between the lower opening 21 a of the sensor housing 21 and the pressure case cylinder 20 in a contracted manner. According to the above, the pressure sensor P is formed by the sensor housing 21 and the pressure case tube portion 20, the pressure chamber 25 is formed by the sensor housing 21 and the pressure chamber recess 20 a, and the pressure introducing hole 7 is formed in the pressure chamber 25. The sensor chip 8 is disposed facing the pressure chamber 25. According to the above, the pressure chamber recess 20a forming the pressure sensor P can be formed integrally with the throttle body 1, and it is not necessary to prepare a special pressure case, so that the manufacturing cost of the pressure sensor P can be reduced. In addition, since the sensor housing 21 is fitted and disposed in the pressure case tube portion 20, the upper height of the pressure sensor P can be lowered, and thereby the overall height of the throttle body can be effectively lowered. According to the above, the mountability to a two-wheeled vehicle having a limited storage space can be greatly improved.

Returning to FIG. 1 again, the opening position A of the pressure introduction hole 7 to the pressure passage 3 and the opening position B of the first pressure detection port 4a to the intake passage 2a1 downstream from the first throttle valve are reached. The distance L1 is the same as the opening position A of the pressure introducing hole 7 to the pressure passage 3 and the distance L2 from the second throttle port of the second pressure detection port 4b to the opening position C to the intake passage 2b1 on the downstream side. In terms of distance, the negative pressure generated in the intake passage 2a1 downstream of the first throttle valve and the negative pressure generated in the intake passage 2b1 downstream of the second throttle valve are synchronized with the pressure introduction hole 7 in synchronization. The negative pressure can be detected more accurately with respect to the throttle valve opening.
This can also be applied to the embodiment shown in FIG. 2, whereby the same operation and effect can be achieved.

  Further, the opening position B of the first pressure detection port 4a to the intake passage 2a1 downstream from the first throttle valve is opened from the center D1 of the first intake passage 2a to the second intake passage 2b side X. When the opening position C of the second pressure detection port 4b to the intake passage 2b1 downstream from the second throttle valve is opened from the center D2 of the second intake passage 2b to the first intake passage 2a side X, The distance L1 from the first pressure detection port 4a to the pressure introduction hole 7 and the distance L2 from the second pressure detection port 4b to the pressure introduction hole 7 can be further shortened. According to this, the pressure sensor The responsiveness of P can be further improved.

  Further, the opening position B of the first pressure detection port 4a to the intake passage 2a1 downstream from the first throttle valve and the second pressure detection port 4b to the intake passage 2b1 downstream of the second throttle valve. According to the fact that the opening position C is opened downward in the direction of gravity from the opening position A to the pressure passage 3 of the pressure introduction hole 7, the blow-back generated in the intake passages 2a1 and 2b1 on the downstream side of the throttle valves. Even if the fuel is prevented from entering the pressure introduction hole 7 and blown back to the vicinity of the pressure introduction hole 7 to reach the fuel, each pressure detection port 4a located at the lower position in the gravitational direction due to its own weight. , 4b. Therefore, the fuel does not stagnate because it blows back into the bottom of the pressure introduction hole 7 and the sensor insertion hole 6 and further into the pressure chamber recess 20a, and the sensor chip 8 stabilizes the negative pressure generated in the intake passage. And can be detected accurately. Note that the opening positions of the pressure detection ports 4a and 4b and the pressure introduction hole 7 described above can be set very easily during machining and casting.

The principal part longitudinal cross-sectional view which shows one Example of the compound cylinder throttle body provided with the pressure sensor which becomes this invention. The principal part longitudinal cross-sectional view which shows the other Example of the compound cylinder throttle body provided with the pressure sensor which becomes this invention. The principal part longitudinal cross-sectional view which shows the conventional compound cylinder throttle body.

1 throttle body 2a1 intake passage 2b1 downstream of the first throttle valve intake passage 3 downstream of the second throttle valve 3 pressure passage 4a first pressure detection port 4b second pressure detection port 6 sensor insertion hole 7 pressure Introduction hole P Pressure sensor

Claims (5)

A plurality of intake passages (2a, 2b) are formed adjacent to each other in a single throttle body (1), and each intake passage is provided by a throttle valve disposed in each intake passage (2a, 2b). (2a, 2b) in a compound cylinder throttle body that is opened and closed synchronously,
The throttle body (1) includes a passage boss (2c) integrally connecting upper walls (2a2, 2b2) of a plurality of adjacent intake passages (2a, 2b), and one side from the passage boss (2c). And a pressure passage extending in the tangential direction of the plurality of intake passages (2a, 2b) from one end surface to the other end of the passage boss (2c). (3), a plurality of pressure detection ports (4a, 4b) extending downward from the pressure passage (3) and opening downstream of the throttle valves of the plurality of intake passages (2a, 2b), and the pressure passage ( 3) A pressure introduction hole (7) extending from one side to open in the sensor insertion boss (5) is formed, and the pressure passage (3) is opened to the end face of the passage boss (2c). Pressure is transmitted to the pressure introducing hole (7) by closing the part with a plug (17). And wherein the pressure sensor (P) for detecting that mounted on the sensor insertion boss (5), Fukudo throttle body comprising pressure sensors. A plurality of intake passages (2a, 2b) are formed adjacent to each other in a single throttle body (1), and each intake passage is provided by a throttle valve disposed in each intake passage (2a, 2b). In a double-hull throttle body that opens and closes synchronously,
The throttle body (1) includes a passage boss (2c) integrally connecting upper walls (2a2, 2b2) of a plurality of adjacent intake passages (2a, 2b), and one side from the passage boss (2c). A pressure case tube portion (20) projecting in the direction is integrally formed, and the passage boss (2c) has a pressure extending in the tangential direction of the plurality of intake passages (2a, 2b) from one end surface to the other end. A passage (3), a plurality of pressure detection ports (4a, 4b) extending downward from the pressure passage (3) and opening downstream of the throttle valves of the plurality of intake passages (2a, 2b), and the pressure passage A pressure introduction hole (7) extending from one side to the other (3) and opening in the pressure case tube portion (20) is drilled to the end face of the passage boss (2c) of the pressure passage (3). Is closed with a plug (17), and the pressure case tube (20) A sensor housing (21) containing a sensor chip (8) of a pressure sensor (P) for detecting the pressure transmitted to the pressure introduction hole (7) is fitted and arranged. A multi-cylinder throttle body having a pressure sensor, wherein a coupler (10) for projectingly arranging a terminal (9) connected to the sensor (P) is integrally formed. The plurality of intake passages are used as a pair of first and second intake passages (2a, 2b) arranged in parallel, and the pressure introduction hole is formed from the first pressure detection port (4a) opened to the first intake passage (2a). The distance (L2) to (7) and the distance (L2) from the second pressure detection port (4b) opening in the second intake passage (2b) to the pressure introduction hole (7) are the same distance. A multiple cylinder throttle body comprising the pressure sensor according to claim 1 or 2, wherein the throttle body is provided.   The first pressure detection port (4a) is disposed closer to the second intake passage 2b than the center (D1) of the first intake passage 2a, and the second pressure detection port (4b) is 4. A multiple cylinder throttle body having a pressure sensor according to claim 3, wherein the throttle body is arranged closer to the first intake passage (2a) side than the center (D2) of the two intake passages (2b).   The first pressure detection port (4a) and the second pressure detection port (4b) are arranged so that the first and second pressure detection ports (4b) are directed downward in the direction of gravity from the opening position (A) of the pressure introduction hole (7) into the pressure passage 3. 4. A multiple cylinder throttle body comprising a pressure sensor according to claim 3, wherein the throttle body is open to two intake passages (2a, 2b).

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