Engine oil cover of automobile engine
By designing a coordination mechanism between torque limiting part one and torque limiting part two, the problem of inaccurate tightening of the oil cap was solved, ensuring the sealing performance and thread integrity of the oil cap and reducing safety hazards.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHONGQING XINYUAN DONGLI MFG CO LTD
- Filing Date
- 2025-06-17
- Publication Date
- 2026-04-17
AI Technical Summary
It is difficult to accurately determine whether the oil cap of a car engine is tightened. If it is not tightened, the sealing effect will be poor, while if it is tightened too much, the threads will be damaged and stripped, affecting the sealing performance and causing safety hazards.
An oil cap has been designed, including a cap plug and a cap handle. Through the cooperation of torque limiting part one and torque limiting part two, the user can intuitively feel the disengagement, ensuring that the oil cap is tightened accurately without damaging the threads.
This ensures accurate tightening of the oil cap, preventing poor sealing and thread damage, reducing safety hazards, and improving sealing performance and service life.
Smart Images
Figure CN224134716U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of automotive engine structure technology, and in particular relates to an oil cap for an automotive engine. Background Technology
[0002] The oil filler cap of a car engine is used to seal the oil sump. It generally consists of a cap body and a sealing device. The cap body is usually a metal part with internal threads that can be screwed onto the oil filler cap. The sealing device is usually a rubber gasket located on the inside of the cap body, used to ensure a seal between the oil filler cap and the filler cap, preventing oil leakage and the entry of external impurities.
[0003] When a user checks the oil level in the oil sump using the dipstick and finds it to be too low, they will add oil to the sump through the oil filler cap. This requires unscrewing the oil cap, and after adding oil, it needs to be tightened again. Common metal threaded caps not only have poor sealing properties, but also make it difficult for the user to accurately judge whether they are tightened properly during the tightening process. If not tightened, the seal will be poor; if tightened too much, the threads of the oil cap will be damaged, causing stripping. This significantly reduces the sealing effect of the oil cap, and the user will be unable to tighten the stripped oil cap after the next oil filler.
[0004] An overly loose oil cap can pose serious safety hazards. First, a poor seal can easily lead to oil leakage, resulting in insufficient engine lubrication, accelerated wear of internal parts, and even damage such as cylinder scoring and shaft failure, leading to high repair costs. Second, leaking oil may splash into the hot exhaust pipe, increasing the risk of spontaneous combustion. Simultaneously, external dust and moisture can penetrate the contaminated oil through the gaps, accelerating oil oxidation and deterioration, reducing lubrication and heat dissipation performance, and eventually causing increased carbon buildup, higher fuel consumption, and reduced power. Furthermore, unsealed oil vapors can contaminate the engine compartment and corrode wiring and rubber components. Utility Model Content
[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an oil cap for a car engine, which solves the problem that users have difficulty accurately judging whether the oil cap is tightened; if it is not tightened, it will result in poor sealing; if it is tightened too much, it will damage the threads of the oil cap and cause stripping, which will greatly reduce the sealing effect of the oil cap. At the same time, after the next oil filling, the user will not be able to tighten the stripped oil cap again; thus, it will cause poor sealing and ultimately lead to vehicle safety hazards.
[0006] To achieve the above and other related objectives, this utility model provides an oil filler cap for an automobile engine, used to seal the oil sump filler neck, comprising:
[0007] The cap has an external thread on its outer wall that matches the internal thread of the oil filler port of the oil sump; the cap is provided with a torque limiting part;
[0008] The cover handle has two limited torsion parts;
[0009] The cap plug and the cap handle are mutually limited in the circumferential direction of the oil cap by the cooperation of the torque limiting part one and the torque limiting part two; when the torque applied to the cap handle drives the torque limiting part one and the torque limiting part two to disengage, the cap plug and the cap handle rotate relative to each other.
[0010] As described above, the oil cap for an automobile engine according to this utility model has at least the following beneficial effects:
[0011] The oil cap of this car engine is mutually restrained in the circumferential direction by the engagement of a cap plug and a cap handle, using torque limiting parts one and two. When the torque applied to the cap handle disengages the torque limiting parts one and two, the cap plug and cap handle rotate relative to each other. This design allows the user to intuitively feel the disengagement of the torque limiting parts one and two when tightening the oil cap, thus accurately judging whether the oil cap is tightened and preventing over-tightening. This solves the problem in existing technologies where users find it difficult to accurately judge whether the oil cap is tightened. If it is not tightened, the sealing effect will be poor; if it is over-tightened, the threads of the oil cap will be damaged and stripped, greatly reducing the sealing effect of the oil cap. Furthermore, after the next oil fill, the user will not be able to tighten the stripped oil cap, resulting in a poor seal and ultimately causing a safety hazard to the vehicle. Attached Figure Description
[0012] Figure 1 This diagram shows the location of the oil cap of an automobile engine according to the present invention.
[0013] Figure 2 The diagram shown is a schematic of the oil dipstick of this utility model.
[0014] Figure 3 The diagram shown is an exploded view of the oil cap and filler neck of this utility model.
[0015] Figure 4 The diagram shown is a schematic of the oil cap of this utility model.
[0016] Figure 5 The image shown is a circumferential sectional view of the oil cap of this utility model.
[0017] Figure 6 The image shown is an axial sectional view of the oil cap of this utility model.
[0018] Component designation explanation
[0019] Oil reservoir 1, filler port 11;
[0020] Oil dipstick 2, handle 21, dipstick body 22, torsion part 23, steel ball 24, weld point 25;
[0021] 3. Oil cap, 31. Cap plug, 32. Cap handle, 33. Ratchet tooth, 34. Ratchet rack, 35. Ratchet rack base, 36. Claw, 37. Claw protrusion, 38. Torsion table, 39. Sealing plug;
[0022] Oil dipstick guide tube 4. Detailed Implementation
[0023] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.
[0024] Please see Figures 1 to 6 It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.
[0025] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.
[0026] Please see Figure 1 , Figure 3 , Figure 4 and Figure 5This utility model provides an oil cap 3 for an automobile engine. Like existing technologies, this oil cap 3 seals the filling port 11 of the engine oil sump 1, preventing contaminants from entering the engine and ensuring oil cleanliness. It also reduces the negative impact of air oxidation on the oil, extending its service life. Furthermore, the oil cap 3 ensures that the high-temperature, high-pressure oil during engine operation will not splash or leak from the filling port 11 of the oil sump 1. The oil cap 3 differs from existing technologies in that it includes a cap plug 31 and a cap handle 32. The outer wall of the cap plug 31 has an external thread that matches the internal thread of the filling port 11 of the oil sump 1. The cap plug 31 has a torque limiting part, and the cap handle 32 has a torque limiting part. The cap plug 31 and the cap handle 32 are part of the oil cap 3. The oil cap 31 and the cover handle 32 rotate relative to each other due to the mutual engagement of the first and second torque limiting parts. When the torque applied to the cover handle 32 drives the first and second torque limiting parts to disengage, the cover plug 31 and the cover handle 32 rotate relative to each other. The torque that drives the first and second torque limiting parts to disengage is greater than the tightening force when tightening the cover. When the user tightens the oil cap 3, they can intuitively feel the first and second torque limiting parts disengaging, thus accurately judging whether the oil cap 3 is tightened and avoiding over-tightening the oil cap 3. The structural design of the oil cap 3 ensures that the user will not experience poor sealing due to not tightening the oil cap 3, nor will over-tightening damage the threads of the oil cap 3, causing stripping and hindering the next oil filling. The specific structural form of the oil cap 3 will be described below.
[0027] like Figure 2As shown, this manual, in addition to introducing the oil cap 3, also introduces another important component relative to the oil sump 1—the oil dipstick 2. The oil dipstick 2 includes a handle 21 and a body 22. The top of the body 22 is fixed to the handle 21, and the body 22 has at least two twisting portions 23. Looking from the bottom to the top of the body 22, the body 22 twists clockwise by 30–60° at the twisting portions 23. When the user inserts the oil dipstick 2 into the oil dipstick guide 4 to check the oil level in the oil sump 1, the at least two twisting portions 23 of the body 22 allow the oil dipstick 2 to bend smoothly to accommodate the curved oil dipstick guide 4. When pulling the oil dipstick 2 out of the oil dipstick guide 4, the twisting portions 23 also allow the user to... The dipstick 2 can be easily pulled out. Considering that the dipstick guide 4 on the transversely mounted gasoline engine of microvans / light commercial vehicles is not only curved but also long to adapt to the overall design of the vehicle body, the corresponding dipstick 2 is also long. At least two twisting parts 23 are designed to ensure that the dipstick 2 can be smoothly inserted into and pulled out of the dipstick guide 4. Compared with the existing technology of using steel wire rope with better flexibility and toughness to make the dipstick body 22, this dipstick 2 not only adapts to the curved dipstick guide 4 on the engine of microvans / light commercial vehicles, but can also be made of common dipstick 2 materials, such as galvanized 65Mn alloy steel or common stainless steel, which reduces the cost in production and subsequent maintenance and replacement.
[0028] In summary, the oil filling and storage module of this automobile engine, composed of the oil cap 3 and the oil dipstick 2, solves the problem of high maintenance costs for the target customer group of microvans / light commercial vehicles by using the above-mentioned structural design.
[0029] In another implementation, please refer to Figure 2 The ruler body 22 is sheet-shaped, and has two twisting parts 23, located at 1 / 3 and 2 / 3 of its length, respectively. Looking from the bottom to the top of the ruler body 22, the ruler body 22 is twisted 45° clockwise at each twisting part 23. The sheet-shaped ruler body 22 has a lower cost for manufacturing the twisting parts 23. The two twisting parts 23 are located at 1 / 3 and 2 / 3 of the length of the ruler body 22, respectively. Compared to other arrangements, this makes it easier to ensure dimensional accuracy during manufacturing and adapts more easily to the curved shape of the oil dipstick guide 4. Of course, designers can design the specific location of the twisting parts 23 according to the specific shape and dimensions of the oil dipstick guide 4, which will not be elaborated here.
[0030] In another implementation, please refer to Figure 2The handle 21 is made of plastic, which is inexpensive and easy to procure; the dipstick body 22 is made of stainless steel, which not only meets the corrosion resistance requirements of the dipstick 2, but also has relatively low raw material procurement costs; a steel ball 24 is welded to the bottom of the dipstick body 22. After the dipstick body 22 is inserted into the oil sump 1, the steel ball 24 contacts the bottom of the oil sump 1, which has a buffering effect compared to the dipstick body 22 making direct contact. This not only protects the bottom of the oil sump 1 from damage, but also protects the dipstick body 22 from wear; multiple weld points 25 are welded on the dipstick body 22 as liquid level markers. For low-cost microvans / light commercial vehicles, welding the weld points 25 is a simple and inexpensive processing method.
[0031] In another implementation, please refer to Figure 2 A sealing ring is installed at the joint between the handle 21 and the dipstick body 22 to prevent engine oil from leaking out of the dipstick guide 4.
[0032] In another implementation, please refer to Figure 2 The handle 21 has an annular hole for easy operation by the user.
[0033] In another implementation, please refer to Figures 3 to 6 We will now describe the specific structures of the first and second torque limiting parts. The cap 31 is a barrel-shaped structure with a closed bottom and an open top. The first torque limiting part consists of multiple ratchet teeth 33 arranged on the inner wall of the cap 31, with the ratchet teeth 33 evenly distributed along the circumference of the cap 31. The second torque limiting part consists of a ratchet bar 34 arranged on the cap handle 32. The ratchet bar 34 and the ratchet teeth 33 mesh together. When the user needs to tighten the oil cap 3, such as... Figure 5 When the cap handle 32 is turned clockwise, the ratchet tooth 33 and the ratchet bar 34 engage when it is not tightened. When tightened, if the user applies more force to turn the cap handle 32, the ratchet bar 34 and the ratchet tooth 33 disengage, and the cap handle 32 and the cap plug 31 rotate relative to each other. The torsional force applied by the user can no longer be transmitted to the cap plug 31 through the cap handle 32, and the external thread on the outer wall of the cap plug 31 will no longer be tightened with the internal thread of the filling port 11. Similarly, when the ratchet bar 34 rotates to the next ratchet tooth 33, the two will disengage. When the user needs to loosen the oil cap 3, such as... Figure 5 As shown, when the cover handle 32 is turned counterclockwise, because the ratchet bar 34 and ratchet teeth 33 have the inverted tooth structure shown in the figure, the ratchet bar 34 and ratchet teeth 33 remain engaged even when a torsional force exceeding the tightening force is applied, thus successfully loosening the oil cap 3.
[0034] In another implementation, please refer to Figure 4 and Figure 5There are multiple ratchet bars 34, which are fixed to the lower surface of the cover handle 32 at equal intervals along the circumference of the cover handle 32; to ensure the stability of the fit between the cover handle 32 and the cover plug 31 when the cover handle 32 is turned.
[0035] In another implementation, please refer to Figure 5 With the central axis of the cover handle 32 as the axis, six ratchet bases 35 are arranged at equal intervals in a circle on the lower part of the cover handle 32. The ratchet bases 35 are fixed to the lower part of the cover handle 32, and the ratchet 34 is fixed to the outside of the ratchet bases 35. The design of the ratchet bases 35 further ensures the stability of the fit between the cover handle 32 and the cover plug 31 when the cover handle 32 is turned.
[0036] In another implementation, please refer to Figure 4 and Figure 6 The outer side of the cover handle 32 is provided with a claw 36, and the top of the cover plug 31 is provided with a locking protrusion 37 in the radial direction. The claw 36 engages with the locking protrusion 37 in the axial direction of the oil cover 3, ensuring that the cover handle 32 and the cover plug 31 can not separate in the axial direction, but can rotate relative to each other in the circumferential direction.
[0037] In another implementation, please refer to Figure 6 There are at least three claws 36, which are arranged at equal intervals on the outside of the cover handle 32 along the circumference of the cover handle 32, thereby ensuring that the cover handle 32 and the cover plug 31 can be stably connected in the axial direction without disengaging; more specifically, the claws 36 can be designed to be eight or other numbers, which will not be elaborated here.
[0038] In another implementation, please refer to Figure 3 and Figure 4 A sealing plug 39 is installed between the cap 31 and the filling port 11 to further ensure the sealing effect of the oil cap 3.
[0039] In another implementation, please refer to Figure 2 The dipstick body 22 is 521mm long, 4.7mm wide, and 1mm thick, to meet the size requirements of the oil dipstick guide 4 of the engine of microvans / light commercial vehicles.
[0040] In other implementations, such as Figure 4 As shown, a torsion plate 38 is fixed to the top of the cover 32. The surface of the torsion plate 38 is provided with anti-slip texture to facilitate the user to turn the oil cap 3.
[0041] In summary, this invention, through the mutual constraint of the cap plug 31 and the cap handle 32 in the circumferential direction of the oil cap 3 by the cooperation of a torque limiting part one and a torque limiting part two, allows the cap plug 31 and the cap handle 32 to rotate relative to each other when the torque applied to the cap handle 32 drives the torque limiting part one and the torque limiting part two to disengage. This design enables the user to intuitively feel the disengagement of the torque limiting part one and the torque limiting part two when tightening the oil cap 3, thus accurately judging whether the oil cap 3 is tightened and avoiding over-tightening. This solves the problem in the prior art where users find it difficult to accurately judge whether the oil cap 3 is tightened; if it is not tightened, it will result in poor sealing; if it is tightened too much, it will damage the threads of the oil cap 3 and cause stripping, which will greatly reduce the sealing effect of the oil cap 3. At the same time, after the next oil filling, the user will not be able to tighten the stripped oil cap 3, resulting in poor sealing and ultimately causing vehicle safety hazards. Therefore, this invention effectively overcomes the shortcomings of the prior art and has high industrial application value.
[0042] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.
Claims
1. An oil filler cap for an automobile engine for sealing a filler opening of an oil sump, characterized by comprising: include: The cap has an external thread on its outer wall that matches the internal thread of the oil filler port of the oil sump; the cap is provided with a torque limiting part; The cover handle has two limited torsion parts; The cap plug and the cap handle are mutually limited in the circumferential direction of the oil cap by the cooperation of the torque limiting part one and the torque limiting part two; when the torque applied to the cap handle drives the torque limiting part one and the torque limiting part two to disengage, the cap plug and the cap handle rotate relative to each other.
2. The oil cap for an automobile engine according to claim 1, characterized in that: The cap is a barrel-shaped structure with a closed bottom and an open top. The first part of the torque limiting is a plurality of ratchet teeth provided on the inner wall of the cap, and the plurality of ratchet teeth are evenly distributed along the circumference of the cap. The second part of the torque limiting is a ratchet bar provided on the cap handle. Both the ratchet bar and the ratchet teeth are reverse teeth and mesh together.
3. The oil cap for an automobile engine according to claim 2, characterized in that: The ratchet bars are multiple in number and are fixedly attached to the lower surface of the cover handle at equal intervals along the circumference of the cover handle.
4. The oil cap for an automobile engine according to claim 1, characterized in that: The outer side of the cover handle is provided with a claw, and the top of the cover plug is provided with a locking protrusion in the radial direction. The claw engages with the locking protrusion in the axial direction of the oil cover.
5. The oil cap for an automobile engine according to claim 3, characterized in that: The lower part of the cover handle is fixed with multiple ratchet bases, and the multiple ratchet bases are arranged in a circle with equal spacing around the central axis of the cover handle. The ratchet bar is fixed to the outside of the ratchet bar base.
6. The oil cap for an automobile engine according to claim 1, characterized in that: A torsion platform is fixed to the top of the cover handle, and the surface of the torsion platform is provided with anti-slip texture.
7. The oil cap for an automobile engine according to claim 4, characterized in that: There are at least three claws, which are arranged at equal intervals on the outer side of the cover handle along the circumference of the cover handle.
8. The oil cap for an automobile engine according to claim 1, characterized in that: A sealing plug is installed between the cap and the filling port.