TWI230221B - Oil level detection device for engine - Google Patents

Abstract

To ensure that the fact that an oil level in an oil sump in a crankcase has reached or fallen below a lower limit level can be exactly detected. The engine 10 includes: a crankcase 14 having a through-hole 27 formed therein and an oil sump 13; and a level gage 32 passing through the through-hole 27 for detection of the oil level 23 in the oil sump 13. The level gage 32 has a base portion 33 detachably and liquid-tightly fitted in the through-hole 27 and has a gage portion 34 formed at one end of the base portion 33. The level of the lower end surface of the projection end of the gage portion 34 is generally in line with the lower limit level 39 of the oil surface of the oil contained in the oil sump 13 when the base portion 33 is fitted in the through-hole 27 to be located in a predetermined position relative to the through-hole 27.

Description

1230221 发明 Description of the invention: [Technical field to which the invention belongs], which provides a bit of 0 This invention relates to an oil level detection oil level gauge for an engine to visually detect the oil in an oil tank of a crankshaft box [ [Prior Art] Conventionally, such an apparatus as shown in Patent Documents has been disclosed in an oil level detecting device of an engine, which will be described later. According to the prior art, in a crank shaft box having an oil groove therein, a through hole with an internal thread is formed in the oil groove, and an oil level gauge is set through the through hole to detect the oil level in the oil groove. The oil level gauge includes: a base portion which is detachably inserted into the through-hole by screwing it into the through-hole along a longitudinal axis of the through-hole in a liquid-tight manner; a measuring portion from which One end of the base portion protrudes toward the oil groove along the longitudinal axis, passes through the through hole, and is separably inserted into the crank shaft box; and a stopper is integrally formed with the other end of the base, When the base portion is screwed into the through hole with respect to the through hole to a predetermined position, the stopper can prevent further insertion. When using the oil level gauge to detect the oil level in the oil tank, first remove the oil stuck to the oil level gauge, then, pass the metering part through the through hole and insert it into the crank shaft box, and the base The seat portion is inserted from the outside into a predetermined insertion position with respect to one of the through holes. More specifically, the base portion is inserted from the outside with respect to an insertion start portion of one of the through holes, and the protruding side of the metering portion is immersed in the oil in the oil tank as the base portion is inserted, so the oil It sticks to the metering part. In this case, the metering portion is detached from the through hole to the outside. The oil level can be known by visually observing the height of O: \ 91 \ 91148.DOC -6- 1230221 where the oil adheres to the metering section. [Patent Document 1] JP-UA-5-87209 [Summary of the Invention] [Problems to be Solved by the Invention] Incidentally, when the oil level in the oil tank reaches or drops below the lower limit of the oil level, it is necessary to give the The oil tank is replenished with oil, so you need to ensure that it is more accurately determined whether the oil level has reached or dropped below the lower limit of the oil level. However, as shown in FIG. 9 of the patent document, the longitudinal axis of the through hole is inclined with respect to the plumb line to form an angle between the longitudinal axis and the plumb line. Therefore, if a metering portion having a large inclination on the side of its protruding end is inserted into the oil in the oil tank, then the oil will end up sticking across the range of the metering portion-length along the longitudinal direction of the metering portion. There is a possibility that it cannot be accurately determined whether the oil level in the oil tank has reached or dropped below the lower limit of the oil level. ^ 'The present invention proposes # in consideration of the above-mentioned circumstances. Therefore, an object of the present invention is to ensure that it can accurately detect that an oil level in an oil tank in a crankcase has reached or dropped below Lower oil level. [Solution to Solve the Problem] The invention according to item 1 of the scope of patent application is for an oil level detection device for an engine, the engine includes:-a crankshaft box 14 having a through hole formed in: 27 and an oil tank 13; and an oil level gauge 32, which passes through the through hole 27 for detecting the position of the oil surface u in the oil tank 13; wherein the oil level gauge 32 has a base portion 33 And a metering part ",

O: \ 9I \ 9II48.DOC 1230221 The base portion 33 is detachably and liquid-tightly installed in the through hole 27, and the meter portion 34 is formed at one end of the base portion 33; and, when the base The seat portion 33 is installed in the through hole 27, so that when the through hole 27 is located at a predetermined position, the position of the bottom end surface of the protruding end 37 of the metering portion 34 is generally the same as the oil surface of the oil contained in the oil groove 13. The lower limit is 39% straight. The invention according to item 2 of the patent application scope relates to the oil level detecting device for an engine in the item 1 of the patent application scope, wherein the protruding end 37 of the metering portion 34 is formed into a substantially hemispherical or cone shape. The invention according to item 3 of the patent application scope relates to the oil level detecting device for an engine in item 1 or 2 of the patent application scope, wherein an extension portion 43 extends from the protruding end 37 of the metering portion 34, and the extension The cross section of the portion 43 is different from the cross section of the protruding end 37 of the metering portion 34. It should be noted that the reference numerals appended to each item in the scope of patent application should not be construed as limiting the technical scope of the present invention to those described later, the content of the embodiment π of the present invention. [Effects of the Present Invention] According to the present invention, the following effects are expected to be achieved. The invention according to claim 1 relates to an oil level detecting device for an engine. The engine includes: a crank shaft box having a through hole and an oil groove formed therein; and an oil level gauge for the oil. The level gauge passes through the through hole for detecting the oil position in the oil tank; wherein the oil level gauge has a base portion and a metering portion, and the base portion is detachably and liquid-tightly installed in the through hole. The metering portion is formed at one end of the base portion. Therefore, when using the oil level gauge of the detection device to detect the oil level in the oil tank

O: \ 9I \ 91I48.DOC 1230221, first remove the oil level gauge from the crankshaft box, and then remove the stick to. Oil on the oil level gauge. Thereafter, the metering portion is inserted into the crank case through the through hole, and the metering portion is immersed and oil is adhered to the metering portion. In this state, the metering part is detached and pulled out, and the oil level can be detected by visually observing the height at which the oil adheres to the metering part. Similarly, in the present invention, when the base portion is installed in the through hole so as to be positioned at a predetermined position relative to the through hole, the bottom surface of the protruding end of the metering portion is generally the same as that of the oil shawl. 》 The limit under the oil is in a straight line. Therefore, 'when it is checked whether the oil level in the oil tank has reached or dropped below the lower limit' f first ', as described in ±, remove the oil stuck to the part of the gauge of the oil level gauge. Thereafter, the metering portion is inserted into the crank case through the through hole from the outside, and is placed in a predetermined position with respect to one of the through holes. Here, when the oil level has reached or dropped below the lower limit, the oil will only stick to the bottom surface of the protruding end of the metering part, and no oil will stick to the remote meter part. This prevents oil from sticking to a range of the length of the metering portion in the longitudinal direction of the metering portion. Therefore, in this state, by pulling out the metering portion to the outside through the through hole and visually observing the oil sticking to the metering portion, it is possible to accurately detect the oil level at or below the lower limit. In the invention according to item 2 of the scope of patent application ', the protruding end of the metering portion is formed into a substantially hemispherical or conical shape.

O: \ 9I \ 9II48 DOC 1230221 Therefore, when the oil level in the oil tank is at the lower limit, the oil may only adhere to the bottom surface of the protruding end of the metering part. Therefore, when the oil level in the oil tank is at the lower limit, it can prevent oil from sticking to a range of one length in the longitudinal direction of the metering portion, and can accurately detect that the oil level has reached or dropped below the lower limit. Bit. In the invention according to item 3 of the scope of patent application, an extended portion is extended from the protruding end of the measuring portion, and the cross-section of the extended portion is different from that of the protruding end of the measuring portion. Therefore, in the case where it is desired to detect the oil level below the lower limit in the oil tank, the oil does not stick to the metering portion, but sticks to the extended portion. Therefore, by visually observing the position where the oil adheres to the extension, the oil level at the lower limit can be detected. Therefore, it is possible to know more accurately the emergency situation of the oil replenishing tank. [The best way to realize the present invention] Regarding an oil level detecting device for an engine according to the present invention, it is used to realize a definitive and accurate detection that the oil level in the oil tank in the crankcase has reached or dropped to an oil level The best method for the lower limit will be described later. In the 忒 mode, the engine includes: a crank shaft box having a through hole and an oil groove formed therein; and an oil level gauge through which the oil level gauge passes to detect the oil level in the oil groove . The oil level gauge has a base portion detachably and liquid-tightly installed in the through hole, and a metering portion, and the metering portion is formed at one end of the base portion. When the base portion is installed in the through hole and is located at a predetermined position relative to the through hole, the bottom end surface of the protruding end of the measuring portion is substantially covered with the oil groove.

O: \ 9I \ 9IU8.DOC 1230221 The lower limit surface of the oil contained is straight. [Embodiment] [First Embodiment] Referring to the attached Figures 1 to 3, the multifilament% a daydreams "", the first embodiment is used to describe the present invention in detail. In Figures 2 and 3 The representative number 1 represents a saddle-type vehicle with a scooter-type two-wheeled vehicle as an example, and the arrow ribs in FIG. 2 indicate the forward direction of the vehicle. «Hai vehicle 1 includes · a vehicle body 2; a front wheel 3 It is operatively supported at the front of the vehicle body 2; a drive unit 5 is pivotally supported at the rear of the vehicle body 2 so as to be able to rotate up and down about a pivot axis 4; a rear wheel 6 is supported at The turning end of the driving unit 5; and a shock absorber 7, which is arranged to bridge the vehicle body 2 and the driving unit 5. The driving unit 5 has a four-stroke internal combustion engine 10 and a reduction gear 11 ' The engine 10 is used to form the front end of the drive unit, the reduction gear 11 is arranged in sequence with the engine 10, and the rear wheel 6 is linked to and connected to the engine 10. The engine 10 includes a crankshaft box 14 The crankcase 14 includes: an oil groove 13 located at the bottom of the crankcase;-the cylinder 1 5. It protrudes forward from the crankcase 14; an air enters the system element 16 and is arranged on the upper side of the cylinder 15; and an exhaust pipe 17 extends downward from the cylinder 15 and then backwards A bracket plate 20 is supported at the rear end of the crankshaft box 14 of the engine 10 by a pair of upper and lower fasteners 19, 19. The bracket plate 20 projects rearwardly from the crankshaft box 14, and at the bracket plate The protruding end of 20 supports the longitudinal O of the exhaust pipe 17 O: \ 9I \ 9M48 DOC -11- 1230221 to the middle part. An oil level detection device 24 is provided, which can detect the oil tank on the basis of visual observation 1 3 The position of the surface 23 of the medium oil 22. The detection device 24 will be described. A through hole 27 is formed in an outer wall 26 of one of the crankshaft boxes 14 above the oil groove 13, and the through hole 27 makes the oil groove 13 and the crankshaft box 14 The outside communicates and fills the oil groove 13 with oil. The through hole 27 is a through hole with an internal thread and the axis 28 of the through hole 27 is inclined at a predetermined angle θ with respect to a plumb line 29 and passes through the vehicle body. 2 outside, and pass through a space 30 backward and upward, the space 30 is between the engine 10 Between the rear surface of the shank box 14 and a vertical middle portion of one of the bracket plates. A resin oil level gauge 32 is provided, and the oil level gauge passes through the through hole 27 and the space 30 from the outside of the vehicle body 2 And can detect the position of the oil surface 23 in the oil tank 13. The oil level gauge 32 includes a cylindrical base portion 33 which is sealed along the longitudinal axis 28 of the through hole 27 in a liquid seal manner. Detachably inserted into the through hole 27; a metering portion 34 passing through the through hole 27 is detachably inserted into the crankcase 14 'and along the longitudinal axis 28 from the end of the base portion 33 It integrally protrudes toward the oil groove 13 in the crankshaft box 14, a stopper 35 is formed integrally with the other end portion of the base portion 33, and abuts on the upper opening edge of the through hole 27, When the base portion 33 is inserted into the through hole 27 by a predetermined distance along the longitudinal axis of the through hole 27, the stopper prevents further insertion; and the two operation portions 36 are integrally formed with the stopper 35.

O: \ 91 \ 9! 148 DOC -12- 1230221 In the third step, the base portion 33 has an external thread for screwing into the through hole 27 so as to sufficiently seal the through hole 27 due to this fit. The metering portion 34 is tapered as a whole, and a cross section perpendicular to its axis is circular and its diameter becomes smaller along the protruding direction of the metering portion 34. One of the protruding ends 37 of the metering portion 34 is formed as an ordinary hemisphere, the center of which is on the axis 28. It should be noted that the protruding end 37 may also be a cone (including a cone with a sharpened tip) which extends coaxially along the axis 28 toward its tip and tapers. In this case, the protruding end 37 may be formed so that the bottom end surface of the protruding end 37 extends horizontally. In FIG. 1, the oil level gauge 32 is formed under the condition that the through hole 27 and the axis 28 of the oil level gauge coincide. When the base portion 33 is in the pre-insertion position relative to the through hole 27, More specifically, the projection of the metering portion 34 is at a position where it is inserted (threaded) from the outside with respect to the through hole 27 (threaded fit) and slightly inserted (threaded). The bottom end surface of the end 37 substantially coincides with the limit 3 9 below the oil level 23 in the oil tank 13. The upper limit 40 of the oil surface 23 is located on a horizontal plane that passes through the substantially bottom end of the opening at the upper end of the through hole 27 When the position of the oil surface 23 of the oil in the oil tank 13 is detected by the oil level gauge 32 of the detection device 24, the oil level gauge 32 is first removed from the crankcase 14, and then the oil adhered to the oil is removed Oil 22 on the metering portion 34 of the position gauge 32. Thereafter, the metering portion 34 is inserted into the crank case 14 through the through hole 27, and the protruding side of the metering portion 34 is immersed in the oil 22, and the oil 22 Adhesive to the metering portion 34. In this state, the through hole 27 will Measuring section O: \ 9I \ 91I48 DOC -13-1230221 Minute 34 is pulled out, and the position of the oil surface 23 of the oil can be detected by visually observing the position of the oil 22 adhered to the measuring section 34. In addition, as above As described above, when the oil level gauge 32 is formed in a predetermined insertion position of the base portion 33 relative to the through hole 27, the bottom end surface of the protruding end 37 of the measuring portion 34 is substantially in the oil groove 13. The limit 39 below the position of the oil surface 23 is in a straight line. Therefore, as described above, when detecting whether the oil level 23 in the oil tank 13 has reached or dropped below the lower limit 39, first, remove the adhesion to the Oil level gauge 3 2 The oil 2 2 on the gauge part 3 4 Then the metering part 34 is inserted into the crank case 14 through the through hole 27, and the base part 33 is inserted from the outside to the opposite side At the predetermined insertion position of the through hole 27 (FIG. 1). More specifically, the base portion 33 is inserted from the outside relative to the insertion start position of the through hole 27. At this time, if the position of the oil surface 23 is Has reached or dropped below the lower limit 39, then the oil 22 will only stick to the metering section The bottom end surface of the protruding end 37 of the part 34, or the oil 22 is not adhered to the metering portion 34 at all. This prevents the oil 22 from adhering to a length range of the metering portion 34 along the longitudinal direction of the metering portion 34. So After passing through the through hole 27, the metering portion 34 in this state is pulled out, and the oil 2 2 adheres to the range of the metering portion 34 is visually observed to accurately detect the position of the oil surface 23 Reached or dropped below the lower limit 39. Also, as described above, the protruding end 37 of the metering portion 34 is formed into a substantially hemispherical or cone. Therefore, when the position of the oil surface 23 in the oil groove 13 is Located at the lower limit of 39

O: \ 91 \ 91148 DOC -14-1230221 and the protruding end 37 of the metering portion 34 is a hemisphere as a whole, even if the metering portion 34 is rotated around the axis 28 and fixed at an arbitrary angular position, the oil 22 can only be adhered at a point To the bottom end surface of the protruding end 37. In the case where the protruding end 37 is a cone, it is formed such that the bottom end surface extends horizontally, and the oil 22 at the lower limit 39 is adhered to the protruding end 37 even if the metering portion 34 rotates around the axis 28 to be fixed. At any angular position, the oil 22 can only stick linearly to the bottom end surface of the protruding end 37. Therefore, in the case where the position of the oil surface 23 in the oil tank 13 is at the lower limit 39, when S measures the oil level with the above-mentioned measuring portion 34, even if the measuring portion 34 is rotated to an arbitrary position about the axis 28, it can be prevented The oil 22 adheres to a range of a length along the longitudinal direction of the metering portion 34, and can accurately detect that the oil level 23 has reached or dropped below the lower limit 39 °. The above structure is shown in the figure However, it should be noted that the through-hole may also be a simple through-hole without an internal thread, the base portion 33 may have a cylindrical shape, and the base portion 33 may be detachably and fluid-tightly sealed by a sealing ring. Ground is inserted into the through hole 27. In this case, the predetermined insertion position of the base 33 with respect to the through hole 27 may be a full insertion position, and further insertion in this position is prevented by the stopper 35. In addition, the through hole may be polygonal, and the base portion 33 and the metering portion 34 may not be collinear with the longitudinal axis 28. Fig. 4 which will be described below shows a second embodiment which has many of the same features as the first embodiment in terms of structure, function and effect. Therefore, for these same features, the same reference numerals will be used in the figure.

O: \ 9I \ 91I48.DOC -15-1230221 will be omitted and repeated description 'will be mainly described for different features. At the same time, the configurations of the respective parts in these embodiments can be variously combined in the context of the ... action and effect of the present invention. [Second Embodiment] Referring to Fig. 4, in order to describe the present invention in more detail, a second embodiment will be described. According to this embodiment, an extended portion 43 extends integrally from the protruding end 37 of the measuring portion along the axis 28 of the protruding end, and the cross section of the extended portion u is different from that of the protruding end 37 of the measuring portion 34. More specifically, although the cross-sections of the protruding end 37 and the extending portion 43 are round, the diameter becomes smaller so that the cross-sectional area of the extending portion 43 becomes smaller than that of the protruding end 37. The cross-sectional area, and the extension portion 43 has a cylindrical shape. Therefore, when the position of the oil surface 23 in the oil groove 13 is lower than the lower limit 39, even if the oil level is detected by the measuring portion 34, the oil 22 does not stick. To the measuring portion 34. However, by visually observing the position where the oil 22 adheres to the extension portion 43 in the longitudinal direction of the extension portion, the oil level 44 below the lower limit 39 can be detected, and the exact The emergency situation of the oil tank 13 is supplemented with oil 22. Although the above structure is shown in the figure, it should be noted that the metering portion 34 and the extension portion 43 may be separate bodies. In addition, the protruding end 37 and the extension portion 43 can have phases Different cross sections. [Brief description of the drawings] FIG. 1 is a cross-sectional side view, which illustrates the function of the detection device of the first embodiment. FIG. 2 is a side view, which illustrates one of the first embodiments. Rear of the vehicle. O: \ 9l \ 91l48.DOC • 16-1230221 Figure 3 is a cross-sectional side view of a detection device of the first embodiment. Figure 4 is a view of a second embodiment, corresponding to Figure 1 The middle part. [Illustration of Symbols] 1 Vehicle 2 Body 5 Drive unit 10 Engine 13 Oil tank 14 Crankshaft box 19 Fastener 20 Bracket plate 22 Oil 23 Oil level 24 Detection device 26 Outer wall 27 Through hole 28 Vertical axis 29 Lead Hammer line 30 Space 32 Oil level gauge 33 Base part 34 Metering part 35 Stopper 36 Operating part O: \ 9I \ 91148 DOC-17-1230221 37 Protruded end 39 Lower limit 40 Upper limit 43 Extension 44 Lower limit Oil level Θ tilt angle O: \ 9l \ 9U48 DOC -18-

Claims (1)

1230221 Patent and application for patent garden: 1. An oil level detection device for a bow engine, the engine includes a crankshaft phase having a through hole formed therein and an oil groove; and an oil ten The 4 'gauge passes through the through hole to detect the position of the oil surface of the oil contained in the oil tank; wherein, the oil level gauge has a base portion and a measuring portion, and the base portion can be separated from the ground and liquid. Installed in the through hole, the metering portion is formed at one end of the base portion; wherein, when the base portion is installed in the through hole and positioned at a predetermined position relative to one of the far through holes The position of the bottom end surface of the protruding end of the trowel is roughly set, and accounts for the bottom of the oil contained in the oil tank. The limit is below a straight line. 2. According to the scope of the patent application No. 丨 ^ ^ It is also used for the oil level detection device of the engine, where the metering part has a convex cone. The taper is formed into a large hemisphere or 3. According to item 1 or 2 of the scope of the patent application, the metering part Horizontal extension of convex extension The cross-sectional surface is not used for an engine oil level detection apparatus of the end of an extended portion extending from the same end of the protruding portion of the metering O:. \ 9I \ 91I48.DOC