A gearbox oil level observation device with exhaust structure and assembly method thereof

Abstract

The present invention discloses a gearbox oil level observation device with an exhaust structure and an assembly method thereof, which comprises a main body, wherein a through hollow chamber is arranged in the main body, wherein a bracket coaxially arranged therewith is fixedly connected to the hollow chamber, wherein the bracket comprises an annular portion, wherein the outer peripheral surface of the annular portion is provided with M protrusions extending radially outward, and the inner peripheral surface of the hollow chamber is provided with N limiting structures for cooperating with the annular portion to realize the fixing of the bracket, wherein M=N≥3. The present invention is not only simple in structure, but also can effectively discharge air bubbles remaining between the glass window and the star-shaped bracket, thereby avoiding the technical problem of misjudgment of the oil amount by the oil level inspector due to air bubbles.

Description

Background Art

[0002] The amount of oil added to the transmission assembly will seriously affect the performance of the transmission. Too little oil will cause premature failure of the transmission gears and bearings. Too much oil will cause the transmission assembly to have excessive temperature rise, resulting in reduced transmission efficiency, oil leakage from the breather plug, gear shifting jams, and premature failure of seals and lubricants. Therefore, it is very important to accurately judge the amount of oil in the transmission.

[0003] In order to solve the above technical problems, the specification of Chinese invention patent CN106015538B discloses a gearbox oil level observation device and its assembly method, the device comprises an inner plug and an outer plug connected coaxially, the inner plug is provided with an inner front cavity coaxial with the inner plug, the outer plug is provided with an outer front cavity and an outer rear cavity coaxial with the outer plug, the inner front cavity is communicated with the outer rear cavity through the outer front cavity, and a transparent sheet is embedded at the junction of the outer front cavity and the outer rear cavity, the oil level observation device also comprises a bracket, the bracket comprises a plurality of mutually connected The sub-frames are connected to each other at the bottom to form a central hole, and the tops of the sub-frames are evenly distributed along the same circle, and the circle where the tops of the sub-frames are located is concentric with the central hole; a coaxial inner rear chamber is arranged below the inner front chamber, and the inner front chamber is connected to the outer rear chamber after passing through the inner rear chamber and the outer front chamber in sequence, and an inner step is arranged at the junction of the inner front chamber and the inner rear chamber, and an outer step is arranged at the junction of the inner rear chamber and the outer front chamber, and a bracket groove is sandwiched between the bottom surface of the inner step and the top surface of the outer platform to be inlaid with the tops of all the sub-frames on the bracket. The bracket is installed according to the following steps: first take a bracket to be installed, and when assembling, first install the lower end face of the bracket on the bracket positioning step between the inner rear chamber and the outer front chamber, that is, the outer step, and then use a pressing tool to press the inner step between the inner front chamber and the inner rear chamber. Under the action of pressure, the main body material at the inner step is subjected to extrusion force, and the main body material is destroyed, deformed, and accumulated on the bracket, so that the bracket is fixed on the outer step, and the assembly can be completed at this time. The assembly method of the above-mentioned gearbox oil level observation device, the transparent sheet is installed according to the following steps: before installing the transparent sheet, the inner bend foot is connected to the bottom of the No. 2 extension end flush along the longitudinal direction. When installing the transparent sheet, first install the outer O-ring into the outer ring groove at the bottom of the No. 1 extension end, and then put the transparent sheet into the sheet cavity surrounded by the No. 1 extension end and the No. 2 extension end, and use a pressing tool to rotate and squeeze the inner bend foot connected to the bottom of the No. 2 extension end in the direction of the outer front cavity until the top of the inner bend foot contacts the bottom of the transparent sheet, and the transparent sheet moves in the direction of the outer O-ring and contacts the outer O-ring to compress the outer O-ring. At this time, there is a gap between the transparent sheet and the No. 1 extension end, and this installation is completed. The invention adds a bracket on the basis of the existing hollow oil plug. The bracket is located at the junction of the inner rear cavity and the outer front cavity. The bracket includes 5 interconnected sub-frames. The bottoms of the 5 sub-frames are interconnected to form a center hole. The aperture size of the center hole is equal to the height difference between the oil level corresponding to the maximum oil volume allowed when the gearbox is running and the oil level corresponding to the minimum oil volume allowed by the gearbox. The upper edge of the center hole is the maximum oil level line allowed by the gearbox, and the lower edge of the center hole is the minimum oil level line allowed by the gearbox. When observing, by observing the specific position of the oil level line extending to the center hole of the bracket, it is possible to accurately determine whether the oil volume of the gearbox is within the allowable range. Therefore, the oil level observation device can judge the oil level with high accuracy and convenient observation.

[0004] However, during actual use of the above invention, when the gearbox is running, the gear pair stirs the lubricating oil, and air enters the lubricating oil to generate bubbles. Some of the bubbles overflow from the lubricating oil and are discharged into the air through the gearbox vent plug, while some of the bubbles remain in the lubricating oil. The bubbles in the lubricating oil enter between the glass window and the star bracket of the observation device. Since there is no exhaust passage, the bubbles will always remain between the glass window and the star bracket. When the amount of gearbox oil is too much and exceeds the upper edge of the center hole, or the amount of oil is insufficient and is lower than the lower edge of the center hole, the bubbles remaining between the glass window and the star bracket may easily cause the person checking the oil amount to misjudge. Summary of the invention

[0005] In view of the technical problems existing in the prior art, the present invention provides a gearbox oil level observation device with an exhaust structure and an assembly method thereof, which not only has a simple structure, but also can effectively discharge air bubbles retained between the glass window and the star-shaped bracket, thereby avoiding the technical problem of oil level inspectors misjudging the oil amount due to air bubbles.

[0006] The present invention discloses a gearbox oil level observation device with an exhaust structure, comprising a main body, wherein a penetrating hollow chamber is arranged inside the main body, wherein the hollow chamber is fixedly connected to a bracket coaxially arranged therewith, wherein the bracket comprises an annular portion, wherein the outer circumferential surface of the annular portion is provided with M protrusions extending radially outward thereof, and the inner circumferential surface of the hollow chamber is provided with N limiting structures for cooperating with the annular portion to fix the bracket, wherein M=N≥3.

[0007] In a preferred embodiment of the present invention, the limiting structure comprises a boss extending radially inwardly of the hollow chamber, and a limiting groove extending radially outwardly of the hollow chamber is provided on the end surface of the boss, and the shape of the limiting groove corresponds to the shape of the protrusion.

[0008] In a preferred embodiment of the present invention, the limiting structure comprises a first pressing plate and a second pressing plate extending radially inwardly of the hollow chamber, and the first pressing plate and the second pressing plate are arranged in parallel and spaced apart along the axial direction of the hollow chamber.

[0009] In a preferred embodiment of the present invention, the annular portion includes a central hole and a plurality of first holes, and the first holes are coaxially distributed relative to the central hole.

[0010] In a preferred embodiment of the present invention, the M protrusions are coaxially distributed relative to the annular portion, and the N limiting structures are coaxially distributed relative to the hollow chamber.

[0011] In a preferred embodiment of the present invention, the main body includes a bottom hole, the diameter of the bottom hole = V1-V2, or the diameter of the bottom hole = 2*(V1-V2), V1 is the maximum refueling amount L+ΔL of the gearbox, V2 is the minimum refueling amount L-ΔL of the gearbox, L is the calibrated oil amount of the gearbox, and ΔL is the tolerance range of the calibrated oil amount.

[0012] The present invention also discloses a main body of a gearbox oil level observation device adapted with an exhaust structure, the main body comprising a hollow chamber, an inner wall of the hollow chamber being provided with an annular boss extending radially inwardly thereof, and the annular boss being provided with N forming seats for forming the limiting structure.

[0013] In a preferred embodiment of the present invention, the cross-sectional shape of the annular boss includes a square, a trapezoid or an L-shape.

[0014] In a preferred embodiment of the present invention, the cross-sectional shape of the forming seat includes square and L-shape.

[0015] The present invention also discloses a main body of a gearbox oil level observation device adapted with an exhaust structure, the main body comprising a hollow chamber, the inner wall of the hollow chamber being provided with an annular boss extending radially inwardly thereof, the annular boss being provided with a first annular seat for supporting the bracket and a second annular seat for forming the limiting structure, the diameter of the first annular seat being smaller than the diameter of the second annular seat, and the height of the first annular seat being smaller than the height of the second annular seat.

[0016] The present invention also discloses a main body of a gearbox oil level observation device adapted with an exhaust structure, the main body comprising a hollow chamber, the inner wall of the hollow chamber being provided with an annular boss extending radially inwardly thereof, the annular boss being provided with a third annular seat for supporting the bracket and N forming bosses for forming the limiting structure, the forming boss being located radially outside the third annular seat, and the height of the forming boss being greater than the height of the third annular seat.

[0017] The present invention also discloses a method for forming a gearbox oil level observation device with an exhaust structure based on a main body: the raised portion of the bracket is placed correspondingly on the forming seat, and the forming seat is formed into the limiting structure based on riveting, and the limiting structure completely covers the raised portion.

[0018] In a preferred embodiment of the present invention, after the limiting structure is formed by riveting and the exhaust hole channel between adjacent protrusions is blocked, the exhaust hole channel is machined out based on machining.

[0019] The beneficial effects of the present invention are as follows: the present invention has the advantages of simple and compact structure and is easy to manufacture and assemble, comprising a main body, a hollow chamber penetrating therein, a bracket coaxially arranged therewith fixedly connected to the hollow chamber, the bracket comprising an annular portion, a convex portion extending radially outwardly is arranged on the outer circumference of the annular portion, and a limiting structure for cooperating with the annular portion to fix the bracket is arranged on the inner circumference of the hollow chamber. This scheme not only maintains the advantages of the original oil level observation device in that it can judge the oil level height, has high accuracy and is convenient for observation, but also can avoid misjudgment caused by the inability to discharge bubbles when checking the oil level height;

[0020] Furthermore, the final formed limiting structure of the present invention may include the following two structures:

[0021] The limiting structure includes a boss extending radially inwardly of the hollow chamber, and a limiting groove extending radially outwardly of the hollow chamber is arranged on the end surface of the boss, and the shape of the limiting groove corresponds to the shape of the raised portion; or the limiting structure includes a first pressing plate and a second pressing plate extending radially inwardly of the hollow chamber, and the first pressing plate and the second pressing plate are arranged in parallel and spaced apart along the axial direction of the hollow chamber, and the axial spacing between the first pressing plate and the second pressing plate is ≤ the thickness of the annular portion;

[0022] The first structure has good stability and can simultaneously realize stable axial and circumferential positioning of the stent. The second structure has the advantage of being easy to form. Although it can realize stable axial and circumferential positioning of the stent through the clamping force, its circumferential positioning is not as good as that of the first embodiment because there is no physical positioning structure and the positioning is realized only by friction.

[0023] Furthermore, the annular portion of the present invention includes a central hole and a plurality of first holes, and the first holes are coaxially distributed relative to the central hole. This structure is more convenient for press-fitting with the limiting structure into an integrated structure.

[0024] Furthermore, the main body of the present invention includes a bottom hole, the diameter of the bottom hole = V1-V2, or the diameter of the bottom hole = 2*(V1-V2), V1 is the maximum refueling amount of the gearbox L+ΔL, V2 is the minimum refueling amount of the gearbox L-ΔL, L is the calibrated oil volume of the gearbox, ΔL is the tolerance range of the calibrated oil volume, and the above scheme can be understood as the height of the upper edge of the aperture being equal to the oil level height corresponding to the maximum oil volume allowed when the gearbox is running; the height corresponding to the center line of the center hole aperture is the oil level height corresponding to the minimum oil volume allowed by the gearbox. When observing, by observing the specific position of the oil level line extending to the center hole of the bracket, it is possible to accurately determine whether the oil volume of the gearbox is within the allowable range. Therefore, the oil level observation device of the present invention can judge the oil level height with high accuracy and convenient observation. The center line of the center hole and the upper edge of the center hole are used as the calibration lines for the minimum and maximum oil volumes. Compared with the original technology that uses the upper and lower edges of the center hole diameter as the calibration lines for the minimum and maximum oil volumes of the gearbox, the control accuracy of the lubricating oil refueling volume is improved;

[0025] Furthermore, the main body of the present invention can be formed by riveting and pressing using the following technical solutions:

[0026] 1. The main body includes a hollow chamber, and an annular boss extending radially inward is arranged on the inner wall of the hollow chamber. N forming seats for forming a limiting structure are arranged on the annular boss. The cross-sectional shape of the annular boss includes a square, a trapezoid or an L-shape; the cross-sectional shape of the forming seat includes a square or an L-shape;

[0027] 2. The main body comprises a hollow chamber, an inner wall of the hollow chamber is provided with an annular boss extending radially inward, a first annular seat for supporting the bracket and a second annular seat for forming a limiting structure are provided on the annular boss, the diameter of the first annular seat is smaller than the diameter of the second annular seat, and the height of the first annular seat is smaller than the height of the second annular seat;

[0028] 3. The main body includes a hollow chamber, and an annular boss extending radially inward is arranged on the inner wall of the hollow chamber. A third annular seat for supporting the bracket and N forming bosses for forming a limiting structure are arranged on the annular boss. The forming boss is located radially outside the third annular seat, and the height of the forming boss is greater than the height of the third annular seat.

[0029] The above technical solution can be used in reasonable combination with the structures of the two brackets recorded above, so it has the advantages of high compatibility and good adaptability;

[0030] Furthermore, the present invention discloses a method for forming a gearbox oil level observation device with an exhaust structure based on a main body: the raised portion of the bracket is placed on a forming seat correspondingly, and the forming seat is riveted to form a limiting structure, and the limiting structure completely covers the raised portion. When the exhaust hole channel between adjacent raised portions is blocked after the limiting structure is riveted, the exhaust hole channel is machined. This method can stably rivet the bracket and the limiting structure into an integrated structure, which not only maintains the advantages of the original oil level observation device in that it can judge the oil level height, has high accuracy, and is easy to observe, but also can avoid misjudgment caused by the inability to discharge bubbles when checking the oil level height. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the first bracket structure of a gearbox oil level observation device with an exhaust structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the first main body structure of a gearbox oil level observation device with an exhaust structure of the present invention;

[0033] Figure 3 This is a schematic diagram of the first bracket structure + the first main body structure of a gearbox oil level observation device with an exhaust structure before assembly of the present invention;

[0034] Figure 4 This is a schematic diagram of the first bracket structure and the first main body structure of a gearbox oil level observation device with an exhaust structure of the present invention after assembly;

[0035] Figure 5 It is a schematic diagram of the second main body structure of a gearbox oil level observation device with an exhaust structure of the present invention;

[0036] Figure 6 This is a schematic diagram of the first bracket structure + the second main body structure of a gearbox oil level observation device with an exhaust structure of the present invention before assembly;

[0037] Figure 7 This is a schematic diagram of the first bracket structure and the second main body structure of a gearbox oil level observation device with an exhaust structure of the present invention after assembly;

[0038] Figure 8 It is the second bracket structure of a gearbox oil level observation device with an exhaust structure of the present invention;

[0039] Fig. 9 It is a schematic diagram of the third main body structure of a gearbox oil level observation device with an exhaust structure of the present invention;

[0040] Fig.10This is a schematic diagram of the second bracket + the third main body of a gearbox oil level observation device with an exhaust structure before assembly of the present invention;

[0041] Fig.11 This is a schematic diagram of the fourth main body structure of a gearbox oil level observation device with an exhaust structure of the present invention;

[0042] Fig.12 This is a schematic diagram of the second bracket and the fourth main body of a gearbox oil level observation device with an exhaust structure before assembly according to the present invention;

[0043] Fig.13 It is a schematic diagram of a bottom hole of a gearbox oil level observation device with an exhaust structure of the present invention;

[0044] Fig.14 It is a schematic diagram of a bottom hole of a gearbox oil level observation device with an exhaust structure of the present invention;

[0045] Fig.15 It is a schematic diagram of a bottom hole of a gearbox oil level observation device with an exhaust structure of the present invention;

[0046] Fig.16 It is a schematic diagram of a gearbox oil level observation device in the prior art;

[0047] Fig.17 It is a schematic diagram of a star-shaped metal bracket of a gearbox oil level observation device in the prior art;

[0048] Fig.18 It is a schematic diagram of a plug body of a gearbox oil level observation device in the prior art;

[0049] In the figure: 1, main body; 2, hollow chamber; 3, bottom hole; 4, bracket; 5, limiting structure; 6, limiting groove; 7, annular boss; 8, forming seat; 9, first annular seat; 10, forming boss; 11, third annular seat; 12, second annular seat;

[0050] 41. Ring-shaped portion; 42. Raised portion; 43. First hole; 44. Center hole; A. Plug body; B. Air bubble. DETAILED DESCRIPTION

[0051] The technical solution of the present invention (including the preferred technical solution) is further described in detail below by means of the accompanying drawings and by listing some optional embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] The present invention discloses a gearbox oil level observation device with an exhaust structure, comprising a main body 1, a hollow chamber 2 penetrating the main body 1, a bracket 4 coaxially arranged therewith fixedly connected to the hollow chamber 2, the bracket 4 comprising an annular portion 41, M protrusions 42 extending radially outwardly are arranged on the outer circumferential surface of the annular portion 41, and N limiting structures 5 for cooperating with the annular portion 41 to fix the bracket 4 are arranged on the inner circumferential surface of the hollow chamber, where M=N≥3.

[0053] In a preferred embodiment of the present invention, the limiting structure 5 includes a boss extending radially inwardly of the hollow chamber 2, and a limiting groove 6 extending radially outwardly of the hollow chamber 2 is provided on the end surface of the boss, and the shape of the limiting groove 6 corresponds to the shape of the protrusion 42.

[0054] In a preferred embodiment of the present invention, the limiting structure 5 includes a first pressure plate and a second pressure plate extending radially inwardly of the hollow chamber 2, and the first pressure plate and the second pressure plate are arranged in parallel and spaced apart along the axial direction of the hollow chamber 2, and the axial spacing between the first pressure plate and the second pressure plate is slightly less than or equal to the thickness of the annular portion 41, and the interference fit between the two ensures that they are limited both circumferentially and axially.

[0055] In a preferred embodiment of the present invention, the annular portion 41 includes a central hole 44 and a plurality of first holes 43, and the first holes 43 are coaxially distributed relative to the central hole 44. This technical solution can be understood as a further improvement of the star-shaped metal bracket disclosed in CN106015538B. The star-shaped metal bracket in CN106015538B includes a plurality of interconnected sub-racks, the bottoms of the plurality of sub-racks are interconnected to form a central hole, the tops of the plurality of sub-racks are evenly distributed along the same circle, and the circle where the tops of the plurality of sub-racks are located is concentrically arranged with the central hole. On this basis, the present invention further processes a circle of concentrically arranged annular grooves on the outer edge of the star-shaped metal bracket. The presence of the annular grooves can provide a channel for the discharge of air bubbles in the lubricating oil, thereby avoiding misjudgment caused by the inability to discharge bubbles when checking the oil level.

[0056] In a preferred embodiment of the present invention, M protrusions 42 are coaxially distributed relative to the annular portion 41 , and N limiting structures 5 are coaxially distributed relative to the hollow chamber 2 .

[0057] In a preferred embodiment of the present invention, Figure 13-15As shown, the main body 1 includes a bottom hole 3, the diameter of the bottom hole 3 = V1-V2, or the diameter of the bottom hole 3 = 2*(V1-V2), V1 is the maximum oil filling amount L+ΔL of the gearbox, V2 is the minimum oil filling amount L-ΔL of the gearbox, L is the calibrated oil volume of the gearbox, and ΔL is the tolerance range of the calibrated oil volume. It can be understood that: the relationship between the setting of the central hole of the observation window and the oil level, assuming that the oil filling amount of the gearbox is: L±ΔL, the oil level corresponding to the maximum oil filling amount L+ΔL is V1, and the oil level corresponding to the minimum oil filling amount L-ΔL is V2. The diameter size of the center hole is related to the control accuracy of the oil filling amount. In order to facilitate the observation of the oil level, the bottom hole of the observation window body should not be set too small. When the control accuracy ΔL of the oil filling amount is low, when the difference between the maximum oil level and the minimum oil level V1-V2 is large, the diameter of the bottom hole of the body can be set as a reference, and the diameter of the bottom hole of the body = V1-V2. When the refueling quantity control accuracy ΔL is high and the difference between the maximum oil level height and the minimum oil level height V1-V2 is small, the diameter of the bottom hole of the main body can be set, and the diameter of the bottom hole of the main body = 2*(V1-V2).

[0058] The present invention also discloses a main body of a gearbox oil level observation device adapted with an exhaust structure, the main body 1 comprising a hollow chamber 2, an inner wall of the hollow chamber 2 being provided with an annular boss 7 extending radially inwardly thereof, and the annular boss 7 being provided with N forming seats 8 for forming a limiting structure 5.

[0059] In a preferred embodiment of the present invention, the cross-sectional shape of the annular boss 7 includes a square, a trapezoid or an L-shape.

[0060] In a preferred embodiment of the present invention, the cross-sectional shape of the forming seat 8 includes a square shape and an L shape.

[0061] It can be understood that the present invention includes two kinds of bracket structures and four kinds of main body structures, which can be arranged and combined to form at least eight specific embodiments of the limiting structure 5 to achieve the connection between the bracket 4 and the limiting structure 5 .

[0062] The specific structures of the two bracket structures are as follows:

[0063] The first type of bracket structure is as follows Figure 1 As shown, the bracket 4 includes an annular portion 41, and five protrusions 42 extending radially outward are arranged on the outer circumference of the annular portion 41. The protrusions 42 are similar to isosceles triangles, and the two hypotenuses of the isosceles triangle are arcs. The five protrusions 42 are coaxially arranged relative to the annular portion 41.

[0064] The second bracket structure is as follows Figure 8As shown, the bracket 4 includes an annular portion 41, and six protrusions 42 extending radially outward are arranged on the outer peripheral surface of the annular portion 41. The protrusions 42 are similar to a trapezoid, and the hypotenuse of the trapezoid is an arc. The annular portion 41 includes a central hole 44 and six first holes 43. The six first holes 43 are coaxially distributed relative to the central hole 44.

[0065] The specific structures of the four main body structures are as follows:

[0066] The first type of body structure is as follows Figure 2 As shown, the main body 1 includes a hollow chamber 2, and an annular boss 7 extending radially inward is provided on the inner wall of the hollow chamber 2, and the cross-sectional shape of the annular boss 7 is square. Five forming seats 8 for forming the limiting structure 5 are provided on the annular boss 7, and the cross-sectional shape of the forming seat 8 is L-shaped.

[0067] The second main body structure is as follows Figure 5 As shown, the main body 1 includes a hollow chamber 2, and an annular boss 7 extending radially inward is arranged on the inner wall of the hollow chamber 2, and the cross-sectional shape of the annular boss 7 is L-shaped. Five forming seats 8 for forming the limiting structure 5 are arranged on the annular boss 7, and the cross-sectional shape of the forming seat 8 is square, and the upper end surface of the square forming seat 8 is lower than the upper end surface of the L-shaped annular boss 7.

[0068] The third main body structure is as follows Fig. 9 As shown, the main body 1 includes a hollow chamber 2, and an annular boss 7 extending radially inward is provided on the inner wall of the hollow chamber 2. A first annular seat 9 for supporting the bracket 4 and a second annular seat 12 for forming a limiting structure 5 are provided on the annular boss 7. The diameter of the first annular seat 9 is smaller than the diameter of the second annular seat 12, and the height of the first annular seat 9 is smaller than the height of the second annular seat 12.

[0069] The fourth main body structure is as follows Fig.11 As shown, the main body 1 includes a hollow chamber 2, and an annular boss 7 extending radially inward is provided on the inner wall of the hollow chamber 2. A third annular seat 11 for supporting the bracket 4 and N forming bosses 10 for forming the limiting structure 5 are provided on the annular boss 7. The forming boss 10 is located radially outside the third annular seat 11, and the height of the forming boss 10 is greater than the height of the third annular seat 11.

[0070] In order to facilitate the understanding of the present invention, several embodiments are now selected to further explain the present invention:

[0071] Embodiment 1, as Figure 3-4As shown, it is the first type of bracket structure + the first type of main body structure, the bracket 4 includes an annular portion 41, and the outer peripheral surface of the annular portion 41 is provided with 5 protrusions 42 extending radially outward, the protrusions 42 are similar to isosceles triangles, the two hypotenuses of the isosceles triangle are arcs, and the 5 protrusions 42 are coaxially arranged relative to the annular portion 41; the main body 1 includes a hollow chamber 2, and the inner wall of the hollow chamber 2 is provided with an annular boss 7 extending radially inward, the cross-sectional shape of the annular boss 7 is square, and the annular boss 7 is provided with 5 forming seats 8 for forming the limiting structure 5, and the cross-sectional shape of the forming seat 8 is L-shaped. During assembly, the bracket 4 is placed on the forming seat 8, and the upper end material of the forming seat 8 is destroyed, deformed, and accumulated on the bracket 4 using a press tool, and the bracket 4 is fixed on the forming seat 8.

[0072] Embodiment 2, as Figure 6-7 As shown, it is the first type of bracket structure + the second type of body structure, the bracket 4 includes an annular portion 41, and the outer peripheral surface of the annular portion 41 is provided with 5 protrusions 42 extending radially outward, the protrusions 42 are similar to isosceles triangles, the two hypotenuses of the isosceles triangle are arcs, and the 5 protrusions 42 are coaxially arranged relative to the annular portion 41. The body 1 includes a hollow chamber 2, and the inner wall of the hollow chamber 2 is provided with an annular boss 7 extending radially inward, the cross-sectional shape of the annular boss 7 is L-shaped, and the annular boss 7 is provided with 5 forming seats 8 for forming the limiting structure 5, the cross-sectional shape of the forming seat 8 is square, and the upper end surface of the square forming seat 8 is lower than the upper end surface of the L-shaped annular boss 7. During assembly, the bracket 4 is placed on the forming seat 8, and a press tool is used to destroy, deform, and accumulate the upper end surface material of the L-shaped annular boss 7 on the bracket 4, and the bracket 4 is fixed on the forming seat 8. It is understandable that the distance between the upper end surface of the L-shaped annular boss 7 and the upper end surface of the bracket 4, the size of the cavity between adjacent forming seats 8, the shape of the press-fitting head and the size of the press-fitting force must meet the manufacturing requirements.

[0073] Embodiment 3, as Fig.10As shown, it is the second bracket structure + the third body structure, the bracket 4 includes an annular portion 41, and the outer peripheral surface of the annular portion 41 is provided with 6 protrusions 42 extending radially outward, the protrusions 42 are similar to trapezoids, and the hypotenuse of the trapezoid is an arc, the annular portion 41 includes a central hole 44 and 6 first holes 43, and the 6 first holes 43 are coaxially distributed relative to the central hole 44. The body 1 includes a hollow chamber 2, and the inner wall of the hollow chamber 2 is provided with an annular boss 7 extending radially inward, and the annular boss 7 is provided with a first annular seat 9 for supporting the bracket 4 and a second annular seat 12 for forming a limiting structure 5, the diameter of the first annular seat 9 is smaller than the diameter of the second annular seat 12, and the height of the first annular seat 9 is smaller than the height of the second annular seat 12. During assembly, the bracket 4 is placed on the first annular seat 9, and a press tool is used to destroy, deform, and accumulate the upper end surface material of the second annular seat 12 on the bracket 4, and the bracket 4 is fixed on the first annular seat 9. It can be understood that: when installing the bracket, a pressing tool is used to destroy, deform, and accumulate the main body material at the second annular seat 12 on the star-shaped metal bracket, and the star-shaped metal bracket is fixed on the first annular seat 9. Then, the exhaust channel is supplemented by machining. The bracket is positioned on the annular step. The bracket is not easily deformed during press-fitting, and the pressing process is not demanding, but the exhaust channel needs to be supplemented.

[0074] Embodiment 4, as Fig.12As shown, it is the second bracket structure + the fourth body structure, the bracket 4 includes an annular portion 41, and the outer peripheral surface of the annular portion 41 is provided with 6 protrusions 42 extending radially outwardly thereof, the protrusions 42 are similar to a trapezoid, and the hypotenuse of the trapezoid is an arc, the annular portion 41 includes a central hole 44 and 6 first holes 43, and the 6 first holes 43 are coaxially distributed relative to the central hole 44. The body 1 includes a hollow chamber 2, and the inner wall of the hollow chamber 2 is provided with an annular boss 7 extending radially inwardly thereof, and the annular boss 7 is provided with a third annular seat 11 for supporting the bracket 4 and N forming bosses 10 for forming the limiting structure 5, and the forming boss 10 is located radially outside the third annular seat 11, and the height of the forming boss 10 is greater than the height of the third annular seat 11. During assembly, the bracket 4 is placed on the third annular seat 11, and a press-fitting tool is used to destroy, deform, and accumulate the upper end surface material of the forming boss 10 on the bracket 4, and the bracket 4 is fixed on the third annular seat 11. It can be understood that: when installing the bracket, a press-fitting tool is used to destroy, deform, and accumulate the main body material at the forming boss 10 on the star-shaped metal bracket, and the star-shaped metal bracket is fixed on the third annular seat 11, and then the exhaust channel is supplemented by machining. The bracket is positioned on the annular step, and the bracket is not easy to deform during press-fitting. The requirements for the press-fitting process are not high, but the exhaust channel needs to be supplemented. The distance between the upper end surface of the forming boss 10 and the end surface of the bracket, the size of the cavity between the forming boss 10 and the bottom diameter of the annular groove, the shape of the press-fitting head, and the size of the press-fitting force must meet the manufacturing requirements. The bracket is positioned on the annular step, and the bracket is not easy to deform during press-fitting.

[0075] The present invention also discloses a method for forming a gearbox oil level observation device with an exhaust structure based on a main body: the raised portion 42 of the bracket 4 is placed correspondingly on the forming seat 8, and the forming seat 8 is riveted to form a limiting structure 5, and the limiting structure 5 completely covers the raised portion 42.

[0076] In a preferred embodiment of the present invention, when the limiting structure 5 is formed by riveting and the exhaust hole channel between adjacent protrusions 42 is blocked, the exhaust hole channel is machined out based on machining.

[0077] It should be pointed out that the structure of the unexpanded part of the main body of the present invention is completely consistent with the plug structure disclosed in CN106015538B. It can be understood that the present invention is an improvement based on the structure disclosed in CN106015538B. The main improvement lies in the shape of the bracket and the shape of the structure inside the main body for connecting the bracket. The rest of the parts remain unchanged, especially the installation position and installation method of the transparent sheet are exactly the same as those of the comparative document CN106015538B. The steps are as follows: before installing the transparent sheet, the inner foot is connected to the bottom of the second extension end in a flush manner along the longitudinal direction; when installing the transparent sheet, first install the outer O-ring into the outer ring groove at the bottom of the first extension end, and then put the transparent sheet into the sheet cavity surrounded by the first and second extension ends, and use a pressing tool to rotate and squeeze the inner foot connected to the bottom of the second extension end toward the outer front cavity until the top of the inner foot contacts the bottom of the transparent sheet, and the transparent sheet moves toward the direction of the outer O-ring and contacts the outer O-ring to compress the outer O-ring. At this time, there is a gap between the transparent sheet and the first extension end, and this installation is completed.

[0078] The present invention is provided with a No. 1 epitaxial end and a No. 2 epitaxial end inside the outer plug, an outer O-ring is installed on the No. 1 epitaxial end, a transparent sheet is installed in the sheet cavity formed by the No. 1 epitaxial end and the No. 2 epitaxial end, and the transparent sheet compresses the outer O-ring by controlling the spinning depth of the No. 2 epitaxial end, and by effectively controlling the gap between the transparent sheet and the No. 1 epitaxial end, sufficient thermal expansion gap is ensured for the inner plug, and the compression amount of the outer O-ring is controlled, thereby improving the sealing performance of the outer O-ring. Therefore, the present invention can effectively improve the sealing performance of the observation device and avoid the possibility of lubricating oil leaking from the inside of the observation device.

[0079] The present invention installs an inner O-ring in the inner ring groove arranged at the top of the outer plug. When the oil level observation device is installed on the gearbox assembly, the inner O-ring is compressed and deformed. By effectively controlling the compression amount of the inner O-ring, the sealing performance of the inner O-ring is improved. Therefore, the present invention can effectively improve the sealing performance of the observation device and avoid the possibility of lubricating oil leakage from the outside of the observation device.

[0080] When the transparent sheet is installed, before the transparent sheet is installed, the inner bend foot is connected to the bottom of the second extension end in a flush longitudinal direction; first, the inner bend foot is set to be flush longitudinally with the bottom of the second extension end to facilitate the installation of the transparent sheet, and after the transparent sheet is installed, the inner corner of the second extension end is rotated and squeezed toward the outer front cavity by a pressing tool until the top of the inner bend foot contacts the bottom of the transparent sheet, and the transparent sheet moves toward the direction of the outer O-ring to compress the outer O-ring. The pressing process simultaneously measures the distance between the upper end face of the transparent sheet and the first extension end, thereby effectively controlling the compression amount of the outer O-ring and effectively avoiding leakage caused by poor sealing. Therefore, the present invention not only has high assembly efficiency, but also has reliable sealing.

[0081] It is easy for technicians in the technical field to understand that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, replacements, improvements, etc. made under the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims

1. A gearbox oil level observation device with an exhaust structure, comprising a main body (1), wherein a through-hole chamber (2) is arranged in the main body (1), and a bracket (4) coaxially arranged therewith is fixedly connected to the hollow chamber (2), characterized in that: The support (4) comprises an annular portion (41), the outer circumferential surface of the annular portion (41) is provided with M protrusions (42) extending radially outward thereof, and the inner circumferential surface of the hollow chamber is provided with N limiting structures (5) for cooperating with the annular portion (41) to fix the support (4), M=N≥3; the limiting structure (5) comprises a boss extending radially inwardly along the hollow chamber (2), and the end surface of the boss is provided with a limiting groove (6) extending radially outwardly along the hollow chamber (2), and the shape of the limiting groove (6) corresponds to the shape of the protrusion (42).

2. The gearbox oil level observation device with exhaust structure according to claim 1, characterized in that: The limiting structure (5) comprises a first pressing plate and a second pressing plate extending radially inwardly of the hollow chamber (2); the first pressing plate and the second pressing plate are arranged in parallel and spaced apart along the axial direction of the hollow chamber (2).

3. The gearbox oil level observation device with exhaust structure according to claim 1, characterized in that: The annular portion (41) comprises a central hole (44) and a plurality of first holes (43), wherein the first holes (43) are coaxially distributed relative to the central hole (44).

4. The gearbox oil level observation device with exhaust structure according to claim 1, characterized in that: The M protrusions (42) are coaxially distributed relative to the annular portion (41), and the N limiting structures (5) are coaxially distributed relative to the hollow chamber (2).

5. The gearbox oil level observation device with exhaust structure according to claim 1, characterized in that: The main body (1) comprises a bottom hole (3), the diameter of the bottom hole (3) = V1-V2, or the diameter of the bottom hole (3) = 2*(V1-V2), V1 is the maximum oil filling amount L+ΔL of the gearbox, V2 is the minimum oil filling amount L-ΔL of the gearbox, L is the calibrated oil volume of the gearbox, and ΔL is the tolerance range of the calibrated oil volume.

6. A main body of a gearbox oil level observation device with an exhaust structure adapted to any one of claims 1 to 5, characterized in that: The main body (1) comprises a hollow chamber (2), an inner wall of which is provided with an annular boss (7) extending radially inward, and the annular boss (7) is provided with N forming seats (8) for forming the limiting structure (5).

7. The main body according to claim 6, characterized in that: The cross-sectional shape of the annular boss (7) includes a square, a trapezoid or an L-shape.

8. The main body according to claim 6, characterized in that: The cross-sectional shape of the forming seat (8) includes a square shape and an L shape.

9. A main body of a gearbox oil level observation device with an exhaust structure adapted to any one of claims 1 to 5, characterized in that: The main body (1) comprises a hollow chamber (2), an inner wall of the hollow chamber (2) is provided with an annular boss (7) extending radially inward, the annular boss (7) is provided with a first annular seat (9) for supporting the bracket (4) and a second annular seat (12) for forming the limiting structure (5), the diameter of the first annular seat (9) is smaller than the diameter of the second annular seat (12), and the height of the first annular seat (9) is smaller than the height of the second annular seat (12).

10. A main body of a gearbox oil level observation device with an exhaust structure adapted to any one of claims 1 to 5, characterized in that: The main body (1) comprises a hollow chamber (2), the inner wall of the hollow chamber (2) is provided with an annular boss (7) extending radially inward, the annular boss (7) is provided with a third annular seat (11) for supporting the bracket (4) and N forming bosses (10) for forming the limiting structure (5), the forming boss (10) is located radially outside the third annular seat (11), and the height of the forming boss (10) is greater than the height of the third annular seat (11).

11. A method for forming a gearbox oil level observation device with an exhaust structure on the main body according to any one of claims 6 to 10: placing the raised portion (42) of the bracket (4) correspondingly on the forming seat (8), and forming the forming seat (8) into the limiting structure (5) based on riveting, and the limiting structure (5) completely covers the raised portion (42).

12. A method for forming a gearbox oil level observation device with an exhaust structure as claimed in claim 11: when the limiting structure (5) is formed by riveting and the exhaust hole channel between adjacent protrusions (42) is blocked, the exhaust hole channel is machined based on machining.

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