Intake valve device

Abstract

The utility model relates to an air inlet valve device. When a throttle valve member is fixed to a throttle shaft, the function of preventing the position of a throttle from shifting is stabilized. An intake valve device having a throttle valve member (40) fixed to a throttle shaft (30) has a structure in which a valve member insertion slit (33) into which the throttle valve member (40) is inserted is formed in the throttle shaft (30) in a radially through state, and the throttle valve member (40) inserted into the valve member insertion slit (33) is fixed to the throttle shaft (30) by means of a fastening mechanism. The valve member insertion slit (33) has a slit center portion (33c) and a pair of tapered portions (33f, 33r) that expand in accordance with one axial end side and the other axial end side of the slit center portion (33c) in the axial direction, and the throttle valve member (40) is fixed to the throttle shaft by a fastening mechanism at the positions of the tapered portions (33f, 33r) of the valve member insertion slit (33).

Description

Technical Field

[0001] This technology relates to an intake valve device, comprising: a throttle body having an intake passage; a throttle shaft having a bearing extending through the intake passage and supported on the throttle body; and a circular plate-shaped throttle valve component fixed to the throttle shaft, capable of adjusting the opening degree of the intake passage. Background Technology

[0002] Patent Document 1 describes the technology related to the aforementioned intake valve device. For example... Figure 6 As shown, the intake valve device 100 described in Patent Document 1 includes a throttle body 103 having an intake passage 102. Furthermore, the intake valve device 100 includes: a throttle shaft 104 that traverses the intake passage 102 and is supported by a bearing 103j on the throttle body 103; and a circular plate-shaped throttle valve member 106 fixed to the throttle shaft 104, capable of adjusting the opening degree of the intake passage 102.

[0003] like Figure 6 , Figure 7 As shown, a valve member insertion slit 104s for inserting the throttle valve member 106 is formed in a radially penetrating state on the throttle valve shaft 104. Furthermore, as... Figure 7 As shown, pointed, spike-like protrusions 104t are formed at the two openings of the valve member insertion slit 104s. The throttle valve member 106, inserted into the valve member insertion slit 104s, is fixed to the throttle shaft 104 using screws 107. At this time, the protrusions 104t at the two openings of the valve member insertion slit 104s engage with the surface and back of the throttle valve member 106, thus preventing the throttle valve member 106 from shifting relative to the throttle shaft 104. Here, the spike-like protrusions 104t effectively utilize burrs from machining processes.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2012-172544 Utility Model Content

[0007] Problems to be solved by utility models

[0008] In the aforementioned intake valve device 100, the structure is as follows: spiky protrusions 104t are formed by inserting the valve member of the throttle valve shaft 104 into the slit 104s. These spiky protrusions 104t bite into the surface and back of the throttle valve member 106, preventing the throttle valve member 106 from shifting position. However, in the structure that uses burrs or the like to form the spiky protrusions 104t, the deviation in preventing position shift is relatively large, and the effect is unstable.

[0009] This technology was developed to solve the aforementioned problems. The problem this invention aims to solve is to stabilize the function of preventing the throttle valve component from shifting position when fixing the throttle valve component to the throttle valve shaft.

[0010] Solution for solving the problem

[0011] The above problems are solved by various technical solutions. The first technical solution is an intake valve device comprising: a throttle body having an intake passage; a throttle shaft passing through the intake passage and supported by a bearing on the throttle body; and a circular plate-shaped throttle valve member fixed to the throttle shaft, capable of adjusting the opening of the intake passage. The intake valve device is characterized in that a valve member insertion slit is formed on the throttle shaft in a radially penetrating state for the insertion of the throttle valve member. The throttle valve member inserted into the valve member insertion slit is fixed to the throttle shaft by a fastening mechanism. The valve member insertion slit on the throttle shaft has a central portion and a pair of tapered portions, which expand axially away from one axial end and the other axial end of the central portion. The throttle valve member is fixed to the throttle shaft by the fastening mechanism at the position of the tapered portion of the valve member insertion slit.

[0012] According to the first technical solution, the valve member insertion slit of the throttle shaft has a central portion of the slit and a pair of tapered portions, which expand axially away from one end and the other end of the central portion of the slit. Therefore, when the throttle valve member is inserted into the valve member insertion slit of the throttle shaft, a gap is formed between the throttle valve member and the tapered portions of the valve member insertion slit. Furthermore, the throttle valve member is fixed to the throttle shaft at the position of the tapered portion of the valve member insertion slit using a fastening mechanism. Thus, by tightening the fastening mechanism, the throttle valve member at the position of the central portion of the valve member insertion slit is pressed from both the surface and back sides. That is, with the throttle valve member fixed to the throttle shaft using the fastening mechanism, the contact pressure at the central portion of the valve member insertion slit, particularly at the junction between the central portion and the tapered portions, increases. This prevents the throttle valve member from shifting position relative to the throttle shaft. Furthermore, since the valve member, which can be precisely formed from the central part and the tapered part of the slit, is inserted into the slit, the function of preventing the positional displacement of the throttle valve member can be stabilized.

[0013] Effects of the utility model

[0014] According to the technology of this application, when the throttle valve component is fixed to the throttle shaft, the function of preventing the throttle valve from shifting position can be stabilized. Attached Figure Description

[0015] Figure 1 This is a top view showing the intake valve device according to Embodiment 1 of this utility model.

[0016] Figure 2 yes Figure 1 Sectional view in direction II-II.

[0017] Figure 3 This is a side view showing the valve component of the throttle shaft inserted into the slit. Figure 2 (Magnified view of the III-direction view).

[0018] Figure 4 yes Figure 3 Sectional view in direction IV-IV.

[0019] Figure 5 This is a longitudinal sectional view showing the screw-based fixing structure of the throttle valve component relative to the throttle shaft.

[0020] Figure 6 This is a longitudinal sectional view showing a conventional intake valve device.

[0021] Figure 7 yes Figure 6 Sectional view along line VII-VII.

[0022] Explanation of reference numerals in the attached figures

[0023] 20. Throttle body; 22. Intake passage; 23. Bearing; 30. Throttle shaft; 33. Valve component insertion slit; 33c. Central part of the slit; 33f. Left conical part; 33r. Right conical part; 35. Internal threaded hole (fastening mechanism); 40. Throttle valve component; 43. Screw through hole (fastening mechanism); 50. Screw (fastening mechanism); C1. Left end; C2. Right end. Detailed Implementation

[0024] [Implementation Method 1]

[0025] The following is based on Figures 1-5 The intake valve device 10 of Embodiment 1 of this utility model will be described. The intake valve device 10 of this embodiment is a device for adjusting the flow rate of combustion air supplied to the engine of a vehicle. Here, the front-back, left-right, and up-down directions shown in the figures correspond to the front-back, left-right, and up-down directions of the intake valve device 10.

[0026] <Summary of Intake Valve Device 10>

[0027] like Figure 1 , Figure 2As shown, the intake valve assembly 10 has a throttle body 20, which has an intake passage 22 for the flow of combustion air. The throttle body 20 is a resin or metal body, with a hollow cylindrical intake passage 22 extending vertically in the center. Figure 1 As shown, a circular throttle valve component 40, capable of adjusting the opening of the intake passage 22, is housed within the intake passage 22. The throttle valve component 40 is mounted to a metal throttle shaft 30 that traverses the intake passage 22 using screws 50. Figure 2 As shown, the throttle shaft 30 is supported by bearings 23 located on the left and right side walls of the throttle body 20, allowing it to rotate around its axis. This allows the throttle valve component 40 to rotate integrally with the throttle shaft 30. Furthermore, by rotating the throttle valve component 40, the opening of the intake passage 22 is adjusted to regulate the flow rate of combustion air.

[0028] <Assembly structure of throttle valve component 40 relative to throttle valve shaft 30>

[0029] like Figure 2 As shown, a valve member insertion slit 33 is formed in the throttle shaft 30 in a radially penetrating state for the throttle valve member 40 to be inserted. Figure 3 As shown, the valve member insertion slit 33 of the throttle shaft 30 is composed of a slit central portion 33c located at the axial center of the throttle shaft 30, a left conical portion 33f formed to the left of the slit central portion 33f, and a right conical portion 33r formed to the right of the slit central portion 33c.

[0030] like Figure 4 As shown, the slit width of the portion 33c of the slit center 33c into which the valve member is inserted, from the left end C1 to the right end C2, is set to be larger than the wall thickness of the throttle valve member 40 by a certain amount of clearance. Furthermore, as... Figure 3 As shown, the left conical portion 33f is formed to gradually expand axially to the left as it moves away from the left end C1 position of the central portion 33c of the slit. The right conical portion 33r is formed to gradually expand axially to the right as it moves away axially to the right as it moves away from the right end C2 position of the central portion 33c of the slit.

[0031] That is, the left and right tapered portions 33f and 33r of the valve component inserted into the slit 33 are formed symmetrically. Furthermore, as... Figure 3 As shown, gaps are formed between the walls of the left and right tapered portions 33f and 33r and the surface and back of the throttle valve component 40. Furthermore, on the throttle valve shaft 30, near the axially outer side of the left end C1 and right end C2 of the slit center portion 33c, internal threaded holes 35 for fastening screws 50 are formed at the positions of the left and right tapered portions 33f and 33r.

[0032] like Figure 1 , Figure 2 As shown, the throttle valve component 40 is a component formed by machining a sheet of metal into a perfect circle, with a roughly constant wall thickness. Furthermore, as... Figure 3 As shown, on the diameter line of the throttle valve component 40, screw through holes 43 are formed at positions corresponding to the left and right internal threaded holes 35 of the throttle valve shaft 30, for screws 50 to pass through. The screw through holes 43 are formed with a diameter larger than that of the internal threaded holes 35.

[0033] <Assembly sequence of throttle valve component 40 relative to throttle valve shaft 30>

[0034] When assembling the throttle valve component 40 to the throttle shaft 30, the throttle valve component 40 is inserted radially into the valve component insertion slit 33 of the throttle shaft 30. Here, in the valve component insertion slit 33, the slit center portion 33c, with the smallest slit width, is set to a slit width larger than the wall thickness of the throttle valve component 40 by an amount of clearance. Therefore, the throttle valve component 40 can be smoothly inserted into the valve component insertion slit 33 of the throttle shaft 30. Next, the left and right screw through holes 43 of the throttle valve component 40 are aligned with the left and right internal threaded holes 35 of the throttle shaft 30, as follows... Figure 5 As shown, screws 50 are tightened into the left and right internal threaded holes 35 of the throttle body shaft 30. Thus, the throttle valve component 40 is fixed to the throttle body shaft 30.

[0035] like Figure 5 As shown, at the position where the valve member is inserted into the tapered portion 33f of the slit 33, a gap is formed between the wall surface of the tapered portion 33f and the surface and back surface of the throttle valve member 40. Therefore, when the screw 50 is tightened into the internal threaded hole 35, due to the tightening force, the wall surface of the tapered portion 33f of the throttle valve shaft 30 is displaced in a manner that clamps the throttle valve member 40 from above and below (refer to the white arrow). As a result, the central portion 33c of the slit, which is already in contact with the surface and back surface of the throttle valve member 40, presses against the surface and back surface of the throttle valve member 40 (refer to the arrow). In particular, the pressing force is greater at the left end C1 (junction portion) of the central portion 33c of the slit. As a result, the contact pressure between the central portion 33c of the slit where the valve member is inserted into the slit 33 and the surface and back surface of the throttle valve member 40 increases. As a result, the positional displacement of the throttle valve member 40 relative to the throttle valve shaft 30 is prevented. Furthermore, since the valve member of the throttle valve shaft 30 can be inserted into the slit 33 with high precision by forming the slit center portion 33c and the tapered portions 33f and 33r, the function of preventing the positional displacement of the throttle valve member 40 can be stabilized.

[0036] <Correspondence between the terminology used in this embodiment and the terminology used in this utility model>

[0037] In this embodiment, the screw 50, the screw through hole 43 of the throttle valve component 40, and the internal threaded hole 35 of the throttle shaft 30 are equivalent to the fastening mechanism of this utility model.

[0038] <Advantages of the intake valve device 10 in this embodiment>

[0039] According to the intake valve device 10 of this embodiment, the throttle valve member 40 is fixed to the throttle shaft 30 at the position of the conical portions 33f and 33r of the valve member insertion slit 33 using screws 50 (fastening mechanisms). As a result, the central portion 33c of the slit where the valve member of the throttle shaft 30 is inserted into the slit 33 is pressed against the surface and back of the throttle valve member 40 by the fastening force of the screws 50. In particular, the pressing force at the junctions C1 and C2 between the central portion 33c of the slit and the conical portions 33f and 33r is relatively large. That is, when the throttle valve member 40 is fixed to the throttle shaft 30 using screws 50, the contact pressure at the central portion 33c of the slit where the valve member is inserted into the slit 33 increases. As a result, positional displacement of the throttle valve member 40 relative to the throttle shaft 30 is prevented. Furthermore, since the valve member of the throttle valve shaft 30 can be inserted into the slit 33 with high precision by forming the slit center portion 33c and the tapered portions 33f and 33r, the function of preventing the positional displacement of the throttle valve member 40 can be stabilized.

[0040] This invention is not limited to the above-described embodiments, and modifications can be made without departing from the spirit of this invention. For example, in this embodiment, as shown... Figure 4 As shown, the wall surface of the central portion 33c of the slit where the valve member is inserted into the slit 33 is formed flat in the radial direction of the throttle shaft 30. However, it is also possible to form a structure in which a protrusion extending axially along the throttle shaft 30 is formed on the wall surface of the central portion 33c of the slit. As a result, the contact pressure between the central portion 33c of the slit where the valve member is inserted into the slit 33 and the surface and back surface of the throttle valve member 40 is further increased.

Claims

1. An intake valve device having: a throttle body provided with an intake passage; a throttle shaft that passes through the intake passage and is supported by a bearing of the throttle body; and a circular-plate-shaped throttle valve member that is fixed to the throttle shaft and is capable of adjusting the opening degree of the intake passage, characterized in that: the throttle shaft is formed with a valve member insertion slit for insertion of the throttle valve member in a state of being penetrated in the radial direction, the throttle valve member inserted into the valve member insertion slit is fixed to the throttle shaft by a fastening mechanism, the valve member insertion slit of the throttle shaft has a slit central portion and a pair of tapered portions that expand with the passage of an axial one end side and an axial other end side of the slit central portion in the axial direction, and the throttle valve member is fixed to the throttle shaft by the fastening mechanism at a position of the tapered portions of the valve member insertion slit.

2. The intake valve device according to claim 1, characterized in that: the fastening mechanism is a bolt-nut fastening mechanism.

3. The intake valve device according to claim 1 or 2, characterized in that: the bolt-nut fastening mechanism is provided with a bolt that is inserted into the valve member insertion slit of the throttle shaft and a nut that is screwed onto the bolt.

4. The intake valve device according to any one of claims 1 to 3, characterized in that: the bolt-nut fastening mechanism is provided with a washer that is interposed between the nut and the throttle valve member.

5. The intake valve device according to any one of claims 1 to 4, characterized in that: the bolt-nut fastening mechanism is provided with a washer that is interposed between the nut and the throttle shaft.

6. The intake valve device according to any one of claims 1 to 5, characterized in that: the bolt-nut fastening mechanism is provided with a washer that is interposed between the bolt and the throttle valve member.

7. The intake valve device according to any one of claims 1 to 6, characterized in that: the bolt-nut fastening mechanism is provided with a washer that is interposed between the bolt and the throttle shaft. ​ ​

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