Dipstick assembly and engine

Abstract

The invention relates to the technical field of engines, and provides an oil dipstick assembly and an engine, and the oil dipstick assembly comprises a guide assembly, an oil dipstick, a handle and an O-shaped ring. Wherein the oil dipstick is fixed with the handle, the oil dipstick and part of the handle can be inserted into the guide assembly, and the oil dipstick can extend into the oil pool along the guide assembly; a groove is formed in the peripheral wall of the handle, the O-shaped ring is installed in the groove and used for sealing a circumferential gap between the handle and the guide assembly, and the minimum value d of the diameter of the section of the O-shaped ring meets the formula d = d4 / 30k; the diameter d3 of the groove bottom of the groove meets d3 = d4-2 (1-k) d; d4 is the diameter of the contact area of the guide assembly and the O-shaped ring, and k is the compression ratio of the O-shaped ring. The O-shaped ring and the groove are designed according to the formula, corresponding design can be carried out according to the actual use condition, and it is guaranteed that the sealing effect can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and particularly to an oil dipstick assembly and an engine. Background Art

[0002] An oil dipstick is a tool used to measure the oil level in an engine. It can measure the oil stock in the engine to ensure that the oil quantity is within a reasonable range to guarantee the normal operation of the engine.

[0003] An oil dipstick usually consists of a scale body with scale lines and a handle. The scale body is inserted into the engine oil pan, and the oil level is determined by reading the scale lines. During the operation of the engine, oil mist and exhaust gas continuously leak into the crankcase, and the pressure in the crankcase gradually increases. The oil dipstick socket is a weak part for the crankcase gas to leak outwards. Since the pressure in the crankcase is higher than the external atmospheric pressure, the frictional force between the oil dipstick socket and the plug itself cannot withstand the increasing pressure from the crankcase, and the oil dipstick plug is pushed away from the oil dipstick socket, and the oil and gas in the crankcase leak out through the oil dipstick hole to the outside of the crankcase where the pressure is lower.

[0004] The models of general O-rings and the designs of the grooves generally refer to ISO3601-2 and the requirements for static piston seals in radial seals. However, the models and sizes of engines are gradually showing a trend of customization, and the existing design methods are difficult to meet the design requirements.

[0005] Therefore, there is an urgent need for an oil dipstick assembly and an engine to solve the above technical problems. Summary of the Invention

[0006] The purpose of the present invention is to provide an oil dipstick assembly that can design the O-ring and the groove for installing the O-ring correspondingly according to the actual usage situation to ensure its sealing effect.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] An oil dipstick assembly, comprising:

[0009] A guiding component;

[0010] An oil dipstick and a handle, the oil dipstick is fixed to the handle, and the oil dipstick and part of the handle can be inserted into the guiding component, and the oil dipstick can extend into the oil sump along the guiding component;

[0011] An O-ring, a groove is formed on the outer peripheral wall of the handle, the O-ring is installed in the groove, the O-ring is used to seal the circumferential gap between the handle and the guiding component, and the minimum value d of the cross-sectional diameter of the O-ring satisfies d = d 4 / 30k; the bottom diameter d 3 of the groove satisfies d3 = d 4 -2(1 - k)d; d 4 is the diameter of the contact area between the above-mentioned guiding component and the above-mentioned O-ring, and k is the compression ratio of the above-mentioned O-ring.

[0012] As a preferred technical solution of the above-mentioned dipstick assembly, the above-mentioned guiding component includes a diversion pipe and a housing. The above-mentioned housing is used to be fixed to the crankcase. The oil forms the above-mentioned oil sump in the above-mentioned crankcase. The above-mentioned diversion pipe is inserted into the above-mentioned housing and is axially relatively fixed. The above-mentioned dipstick can be inserted into the above-mentioned diversion pipe and extend into the above-mentioned oil sump along the above-mentioned diversion pipe.

[0013] As a preferred technical solution of the above-mentioned dipstick assembly, it further includes a reflux member. The above-mentioned reflux member is relatively fixed to the above-mentioned housing. The above-mentioned reflux member includes a plurality of scraping portions. The above-mentioned scraping portions can undergo elastic deformation. The above-mentioned dipstick passes through the above-mentioned reflux member and is inserted into the above-mentioned diversion pipe. The plurality of above-mentioned scraping portions can abut against the surface of the above-mentioned dipstick.

[0014] As a preferred technical solution of the above-mentioned dipstick assembly, a guiding surface is provided on the side of the above-mentioned scraping portion facing away from the above-mentioned diversion pipe. The above-mentioned dipstick can pass through the above-mentioned reflux member along the above-mentioned guiding surface and be inserted into the above-mentioned diversion pipe.

[0015] As a preferred technical solution of the above-mentioned dipstick assembly, the above-mentioned reflux member is provided with a reflux hole. During the process of the above-mentioned dipstick being inserted into the above-mentioned diversion pipe, the oil separated from the surface of the above-mentioned dipstick by the above-mentioned scraping portions can return to the above-mentioned oil sump through the above-mentioned reflux hole.

[0016] As a preferred technical solution of the above-mentioned dipstick assembly, it further includes a cover. The above-mentioned cover is installed at one end of the above-mentioned housing away from the above-mentioned oil sump. The above-mentioned dipstick and part of the above-mentioned handle can pass through the above-mentioned cover. Axially of the above-mentioned diversion pipe, the above-mentioned reflux member is clamped between the above-mentioned cover and the above-mentioned housing.

[0017] As a preferred technical solution of the above-mentioned dipstick assembly, a ventilation hole is provided on the side wall of the above-mentioned housing. The above-mentioned ventilation hole is located above the highest liquid level of the above-mentioned oil sump. The opening on the side of the above-mentioned diversion pipe away from the above-mentioned oil sump is communicated with the above-mentioned ventilation hole.

[0018] As a preferred technical solution of the above-mentioned dipstick assembly, the above-mentioned guiding component further includes a support member. The above-mentioned diversion pipe is supported in the above-mentioned housing through the above-mentioned support member.

[0019] As a preferred technical solution of the above-mentioned dipstick assembly, the above-mentioned guiding component further includes a limiting bracket. The above-mentioned limiting bracket is fixed to the above-mentioned crankcase. One end of the above-mentioned diversion pipe close to the above-mentioned oil sump is inserted into the above-mentioned limiting bracket to keep the end of the above-mentioned diversion pipe close to the above-mentioned oil sump perpendicular to the liquid level of the above-mentioned oil sump.

[0020] An engine is also provided, which includes the above oil sump and the above dipstick assembly.

[0021] Advantages of the present invention:

[0022] The present invention provides a dipstick assembly, which includes a guiding assembly, a dipstick, a handle and an O-ring. Among them, the dipstick is fixed to the handle, and the dipstick and part of the handle can be inserted into the guiding assembly. The dipstick can extend into the oil sump along the guiding assembly; a groove is formed on the outer peripheral wall of the handle, and the O-ring is installed in the groove. The O-ring is used to seal the circumferential gap between the handle and the guiding assembly. The minimum value d of the cross-sectional diameter of the O-ring satisfies d = d 4 / 30k; the bottom diameter d 3 of the groove satisfies d 3 = d 4 -2(1-k)d; d 4 is the diameter of the contact area between the guiding assembly and the O-ring, and k is the compression ratio of the O-ring.

[0023] Exemplarily, the guiding assembly is relatively fixed to the crankcase. One end of the guiding assembly extends into the crankcase, and the other end is located outside the crankcase; the dipstick can enter the crankcase along the guiding assembly and extend below the liquid level of the oil, so as to obtain the height information of the liquid level. Part of the handle is always exposed outside the guiding assembly, and the user can draw out the dipstick from the guiding assembly and insert the dipstick into the guiding assembly by holding the handle. A groove is formed on the outer peripheral wall of the handle. Part of the O-ring is buried in the groove, and the other part is exposed outside the groove and abuts against the inner peripheral wall of the guiding assembly to form a seal, and can increase the friction between the handle and the guiding assembly, making it not easy to loosen, thereby suppressing the oil and gas leakage at the insertion part of the handle and the guiding assembly.

[0024] Furthermore, in the present invention, a design formula for the O-ring and the groove is also provided, and corresponding designs can be carried out according to the actual usage situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the content of the embodiments of the present invention and these drawings without creative efforts.

[0026] Figure 1 is a schematic structural diagram of the dipstick assembly provided by the embodiment of the present invention;

[0027] Figure 2 is a cross-section of the dipstick assembly provided by the embodiment of the present invention Figure 1 ;

[0028] Figure 3 is Figure 2 The partial enlarged view at position A in

[0029] Figure 4 The cross-section of the dipstick assembly provided by an embodiment of the present invention Figure 2 ;

[0030] Figure 5 is the structural schematic diagram of the reflux part provided by an embodiment of the present invention.

[0031] In the figure:

[0032] 100, guiding assembly; 110, diversion pipe; 120, housing; 121, ventilation hole; 122, support platform; 130, cover; 140, support member; 150, limiting bracket;

[0033] 210, dipstick; 220, handle; 221, groove;

[0034] 300, O-ring;

[0035] 400, reflux part; 410, scraping part; 411, guiding surface; 412, reflux hole. Detailed implementation manners

[0036] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only the parts related to the present invention are shown in the drawings, rather than all the structures.

[0037] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0039] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] As Figures 1 to 5 shown, the present invention provides an oil dipstick assembly, including a guiding assembly 100, an oil dipstick 210, a handle 220 and an O-ring 300. Among them, the oil dipstick 210 is fixed to the handle 220, and the oil dipstick 210 and a part of the handle 220 can be inserted into the guiding assembly 100, and the oil dipstick 210 can extend into the oil sump along the guiding assembly 100; a groove 221 is formed on the outer peripheral wall of the handle 220, and the O-ring 300 is installed in the groove 221. The O-ring 300 is used to seal the circumferential gap between the handle 220 and the guiding assembly 100. The minimum value d of the cross-sectional diameter of the O-ring 300 satisfies d = d 4 / 30k; the bottom diameter d 3 of the groove 221 satisfies d 3 = d 4 - 2(1 - k)d; d 4 is the diameter of the contact area between the guiding assembly 100 and the O-ring 300, and k is the compression ratio of the O-ring 300.

[0041] Exemplarily, the guiding component 100 is relatively fixed to the crankcase. One end of the guiding component 100 extends into the crankcase, and the other end is located outside the crankcase; the dipstick 210 can enter the crankcase along the guiding component 100 and extend below the liquid level of the oil to obtain the height information of the liquid level. Part of the handle 220 is always exposed outside the guiding component 100, and the user can draw out the dipstick 210 from the guiding component 100 and insert the dipstick 210 into the guiding component 100 by holding the handle 220. A groove 221 is formed on the outer peripheral wall of the handle 220. Part of the O-ring 300 is embedded in the groove 221, and the other part is exposed outside the groove 221 and abuts against the inner peripheral wall of the guiding component 100 to form a seal, and can increase the friction between the handle 220 and the guiding component 100, making it not easy to loosen, thereby suppressing the oil and gas leakage at the insertion joint between the handle 220 and the guiding component 100.

[0042] Further, the present invention also provides a design formula for the O-ring 300 and the groove 221, and corresponding designs can be carried out according to the actual use situation.

[0043] Exemplarily, let d 4 of the engine be 20 mm, and k ranges from 0.19 to 0.27. Then, according to the formula d = d 4 / 30k, it can be known that the minimum value range of the cross-sectional diameter d of the O-ring 300 under this engine model is between 2.47 mm and 3.51 mm. That is, when the above values are satisfied, the acting force between the O-ring 300 and the handle 220 is greater than the acting force of the pressure in the crankcase on the handle 220, and the dipstick 210 and the handle 220 will not withdraw from the guiding component 100.

[0044] Further, when k takes 0.25, the cross-sectional diameter d of the O-ring 300 takes 2.62 mm. According to the formula d 3 = d 4 -2(1 - k)d, the bottom diameter of the groove 221 can be obtained as 16.07 mm.

[0045] Optionally, the guiding component 100 includes a diversion pipe 110 and a housing 120. The housing 120 is used to be fixed to the crankcase. The oil forms an oil sump in the crankcase. The diversion pipe 110 is inserted into the housing 120 and is axially relatively fixed, and the dipstick 210 can be inserted into the diversion pipe 110 and extend into the oil sump along the diversion pipe 110.

[0046] Exemplarily, the housing 120 is tubular and is relatively fixed to the crankcase; the diversion pipe 110 includes a first end and a second end. In the vertical direction, the first end is below the second end. The first end is adjacent to the oil sump, and the second end is above the liquid level of the oil sump. The second end is inserted into the housing 120 and is axially relatively fixed to the housing 120. In this way, the housing 120 can protect the second end portion of the diversion pipe 110 and can keep the diversion pipe 110 relatively fixed to the crankcase, facilitating the assembly of the dipstick 210 and the diversion pipe 110. The dipstick 210 can extend into the oil sump along the diversion pipe 110 for measurement.

[0047] Optionally, the dipstick assembly further includes a return member 400. The return member 400 is relatively fixed to the housing 120. The return member 400 includes a plurality of scraping portions 410. The scraping portions 410 can undergo elastic deformation. The dipstick 210 passes through the return member 400 and is inserted into the diversion pipe 110. The plurality of scraping portions 410 can abut against the surface of the dipstick 210.

[0048] Exemplarily, in this embodiment, the cross-section of the dipstick 210 is rectangular. The plane where the long side of the rectangle is located is the main plane, and the plane where the short side of the rectangle is located is the secondary plane. The return member 400 includes two scraping portions 410. The two scraping portions 410 are arranged oppositely, and the gap width between the two is b1. The length of the short side of the rectangle is b2, and b1 < b2 is satisfied. When the dipstick 210 is inserted into the diversion pipe 110, the dipstick 210 first passes through the return member 400 from the gap between the two scraping portions 410. At least one of the two scraping portions 410 undergoes elastic deformation, so that the dipstick 210 is clamped between the two scraping portions 410. The two scraping portions 410 are closely attached to the main plane of the dipstick 210. When the dipstick 210 is withdrawn from the guide pipe, the scraping portions 410 scrape off the excess oil liquid attached to the surface of the dipstick 210 from the main plane of the oil sump. This part of the oil liquid cannot pass through the return member 400 and returns to the dipstick 210. In this way, it is possible to reduce the waste of oil liquid caused by part of the oil liquid escaping from the oil sump with the dipstick 210 every time the oil liquid is measured.

[0049] In other embodiments, there can be a plurality of scraping portions 410, and the plurality of scraping portions 410 are evenly distributed around the axis of the guide pipe.

[0050] Optionally, a guiding surface 411 is provided on the side of the scraping portion 410 facing away from the diversion pipe 110. The dipstick 210 can pass through the return member 400 along the guiding surface 411 and be inserted into the diversion pipe 110.

[0051] Exemplarily, a guiding surface 411 is provided on the side of the scraping part 410 facing away from the diversion pipe 110. From the adjacent ends of the scraping part 410 to the ends away from each other, the guiding surface 411 gradually moves away from the diversion pipe 110. In this way, when the dipstick 210 is inserted into the diversion pipe 110, the end of the dipstick 210 can quickly align with the diversion pipe 110 along the guiding surface 411.

[0052] In this embodiment, the reflux member 400 includes two scraping parts 410. The guiding surfaces 411 of the two scraping parts 410 are arranged in a V shape, and in the axial projection of the diversion pipe 110, the gap between the two scraping parts 410 is in a linear shape and coincides with one of the diameters of the cross-section of the diversion pipe 110.

[0053] Optionally, the reflux member 400 is provided with a reflux hole 412. During the process of inserting the dipstick 210 into the diversion pipe 110, the oil liquid separated from the surface of the dipstick 210 by the scraping part 410 can return to the oil sump through the reflux hole 412.

[0054] Exemplarily, the reflux member 400 includes two scraping parts 410. The two scraping parts 410 are symmetrically arranged in the first direction and are used to closely adhere to the main plane of the oil sump. The reflux member 400 is provided with two reflux holes 412, and the two reflux holes 412 are formed on both sides of the scraping part 410 in the second direction, that is, symmetrically located on the opposite sides of the secondary plane of the oil sump. The first direction is perpendicular to the second direction. In this way, when the dipstick 210 is inserted into the diversion pipe 110, the scraping part 410 closely adheres to the dipstick 210, scraping off the excess oil liquid attached to the surface of the dipstick 210. This part of the oil liquid can pass through the reflux hole 412 through the reflux member 400 and return to the oil sump. In this way, the waste of oil liquid can be reduced.

[0055] Optionally, the guiding assembly 100 further includes a cover 130. The cover 130 is installed at the end of the outer shell 120 away from the oil sump. The dipstick 210 and part of the handle 220 can penetrate through the cover 130. In the axial direction of the diversion pipe 110, the reflux member 400 is clamped between the cover 130 and the outer shell 120.

[0056] Exemplarily, the cover 130 is detachably connected to the outer shell 120. In this way, when it is necessary to disassemble the reflux member 400, only the cover needs to be removed, which is convenient for the assembly operation.

[0057] Optionally, a support platform 122 is provided at the end of the outer shell 120 away from the oil sump. The support platform 122 is provided with a groove along the axial direction of the diversion pipe 110, and the cover 130 presses the reflux member 400 into the groove.

[0058] Optionally, a ventilation hole 121 is provided on the side wall of the outer shell 120. The ventilation hole 121 is located above the highest liquid level of the oil sump, and the opening on the side of the diversion pipe 110 away from the oil sump is communicated with the ventilation hole 121.

[0059] Exemplarily, the second end of the draft tube 110 is spaced from the housing 120. The circumferential side wall of the housing 120 is provided with a ventilation hole 121. The second end of the draft tube 110 can communicate with the ventilation hole 121, so that the pressure in the draft tube 110 is kept consistent with the pressure in the crankcase. Using the principle of communicating vessels, the liquid level height of the oil in the draft tube 110 is consistent with the liquid level height of the oil sump in the crankcase, thereby improving the measurement accuracy of the dipstick 210. That is, the dipstick 210 obtains the liquid level height in the draft tube 110, which is equivalent to obtaining the liquid level height of the oil sump.

[0060] Optionally, the guiding assembly 100 further includes a support member 140. The draft tube 110 is supported in the housing 120 through the support member 140.

[0061] Optionally, the guiding assembly 100 further includes a limiting bracket 150. The limiting bracket 150 is fixed to the crankcase. One end of the draft tube 110 close to the oil sump is inserted into the limiting bracket 150 to keep the end of the draft tube 110 close to the oil sump perpendicular to the liquid level of the oil sump.

[0062] In this way, when the dipstick 210 is inserted along the draft tube 110, the dipstick 210 can be inserted vertically below the liquid level, thereby improving the measurement accuracy.

[0063] An engine is also provided, which includes an oil sump and the above dipstick assembly.

[0064] In addition, the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An oil dipstick assembly, characterized in that: include: A guide assembly (100); An oil dipstick (210) and a handle (220), wherein the oil dipstick (210) is fixed to the handle (220), the oil dipstick (210) and a portion of the handle (220) can be inserted into the guide assembly (100), and the oil dipstick (210) can extend into the oil pool along the guide assembly (100); An O-ring (300) is provided on the outer wall of the handle (220) with a groove (221), and the O-ring (300) is installed in the groove (221). The O-ring (300) is used to seal the circumferential gap between the handle (220) and the guide assembly (100). The minimum value d of the cross-sectional diameter of the O-ring (300) satisfies d=d4 / 30k; the bottom diameter d3 of the groove (221) satisfies d3=d4-2(1-k)d; d4 is the diameter of the contact area between the guide assembly (100) and the O-ring (300), and k is the compression rate of the O-ring (300).

2. The dipstick assembly according to claim 1, characterized in that The guide assembly (100) comprises a guide tube (110) and a housing (120); the housing (120) is used to be fixed to a crankcase; oil forms the oil pool in the crankcase; the guide tube (110) is inserted into the housing (120) and relatively fixed in the axial direction; and the oil dipstick (210) can be inserted into the guide tube (110) and extend into the oil pool along the guide tube (110).

3. The dipstick assembly according to claim 2, characterized in that: The invention also comprises a return member (400), wherein the return member (400) is relatively fixed to the housing (120), the return member (400) comprises a plurality of scraper portions (410), the scraper portions (410) are capable of elastic deformation, the oil dipstick (210) penetrates the return member (400) and is inserted into the guide tube (110), and the plurality of scraper portions (410) are capable of abutting against the surface of the oil dipstick (210).

4. The dipstick assembly according to claim 3, characterized in that A guide surface (411) is provided on the side of the scraper portion (410) facing away from the flow guide tube (110), and the oil dipstick (210) can pass through the return member (400) along the guide surface (411) and be inserted into the flow guide tube (110).

5. The dipstick assembly according to claim 3, characterized in that: The reflux member (400) is provided with a reflux hole (412), and when the oil dipstick (210) is inserted into the guide tube (110), the oil separated from the surface of the oil dipstick (210) by the scraper portion (410) can be returned to the oil pool through the reflux hole (412).

6. The dipstick assembly according to claim 3, characterized in that The invention also comprises a cover (130), wherein the cover (130) is installed at one end of the housing (120) away from the oil pool, the oil dipstick (210) and part of the handle (220) can pass through the cover (130), and the return member (400) is sandwiched between the cover (130) and the housing (120) in the axial direction of the guide tube (110).

7. The dipstick assembly according to claim 2, characterized in that A vent hole (121) is provided on the side wall of the housing (120), and the vent hole (121) is located above the highest liquid level of the oil pool. The opening of the guide tube (110) at a side away from the oil pool is in communication with the vent hole (121).

8. The dipstick assembly according to claim 2, characterized in that The guide assembly (100) further comprises a support member (140), and the flow guide tube (110) is mounted in the housing (120) via the support member (140).

9. The dipstick assembly according to any one of claims 2 to 8, characterized in that: The guide assembly (100) further comprises a limit bracket (150), wherein the limit bracket (150) is fixed to the crankcase, and one end of the guide tube (110) close to the oil pool is inserted into the limit bracket (150) to keep the end of the guide tube (110) close to the oil pool perpendicular to the liquid surface of the oil pool.

10. An engine, characterized in that It comprises the oil pool and the oil dipstick assembly according to any one of claims 1 to 9.

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