A prefabricated rubber blank for skeleton oil seal and its manufacturing process

Abstract

The present invention provides a prefabricated rubber blank for a skeleton oil seal and a manufacturing process thereof. The prefabricated rubber blank for a skeleton oil seal comprises a detachable skeleton and a rubber blank, the skeleton comprises a side wall portion and a circumferential wall portion, the rubber blank comprises an intermediate interconnection portion and a plurality of extension portions distributed in a circumferential array, the extension portions extending outward from the intermediate interconnection portion; a split seam is provided on each of the extension portions, the split seam divides the extension portion into an upper petal and a lower petal in the thickness direction, and the side wall portion of the skeleton is clamped between the upper petal and the lower petal. The present invention increases the extension amplitude of the rubber blank, cuts the extension portion of the rubber blank into two pieces, which are arranged above and below the skeleton, and the extension portions have respectively entered the narrow space formed between the skeleton and the mold, which plays a good guiding role for the molten adhesive after hot melting in mold closing, improves the uniformity of the molten adhesive flow, improves the molding quality and yield of the skeleton oil seal, and improves production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of oil seal manufacturing, in particular to a prefabricated rubber blank of a skeleton oil seal and a manufacturing process thereof. Background Art

[0002] At present, when producing skeleton oil seals, Figure 1 、 2 As shown, a skeleton 91 and a rubber blank 92 are typically placed together in a mold cavity before being heated and vulcanized to form a skeleton oil seal 93. Conventional rubber blank 92 is typically smaller than the inner circumference of skeleton 91. Due to the obstruction of skeleton 91, the hot melted rubber cannot smoothly fill the narrow gap between the skeleton and the mold cavity. This can cause material shortages in certain areas of the molded skeleton oil seal, resulting in unstable quality and a reduced yield rate. Summary of the Invention

[0003] In order to overcome the above-mentioned deficiencies in the prior art, the present invention aims to provide a prefabricated rubber blank for a skeleton oil seal and a manufacturing process thereof.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention to solve its technical problems is: a skeleton oil seal prefabricated rubber blank, including a detachable skeleton and a rubber blank, the skeleton including a side wall portion and a circumferential wall portion, the side wall portion is in a circular ring shape, and the circumferential wall portion extends vertically outward from the outer edge of the side wall portion; the rubber blank includes a middle interconnecting portion and a plurality of extension portions distributed in a circumferential array, the extension portions extending outward from the middle interconnecting portion; a dividing seam is provided on each of the extension portions, the dividing seam divides the extension portion into an upper petal and a lower petal in the thickness direction, and the side wall portion of the skeleton is clamped between the upper petal and the lower petal.

[0005] The present invention increases the extension range of the rubber blank and cuts the extension part of the rubber blank into two pieces, which are respectively arranged above and below the skeleton. The extension parts have respectively entered the narrow space formed between the skeleton and the mold, which plays a good guiding role for the molten glue after the mold is hot-melted, improves the uniformity of the molten glue flow, enhances the molding quality and yield of the skeleton oil seal, and improves production efficiency.

[0006] Furthermore, there is a gap between the outer edge of the extension portion of the rubber blank and the circumferential wall portion of the skeleton.

[0007] Furthermore, the gap is 1-5 mm.

[0008] By adopting the above preferred solution, leaving a smaller gap can not only maximize the extension length and improve the fluidity of the sol, but also keep the position of the rubber blank on the skeleton stable and consistent.

[0009] Furthermore, the width of the outer extension of the rubber blank gradually increases from the root toward the outside.

[0010] Furthermore, the outer edge width of the extension portion is 1.4-1.8 times the root width.

[0011] By adopting the above preferred solution, reasonable structural design is more conducive to faster combination of the sol in the extension portion with the circumferential wall of the skeleton.

[0012] Furthermore, in axial projection, the blank area between adjacent extensions is 0.8-1.2 times the area of ​​a single extension.

[0013] The above preferred solution is adopted to ensure that the sol forms a certain radial flow, improve the global flow performance, and ensure the uniformity of the sol distribution.

[0014] A manufacturing process for a prefabricated rubber blank of a skeleton oil seal comprises the following steps:

[0015] Step 1, punching the skeleton;

[0016] Step 2: manufacturing a tooling with a die shape consistent with the outer contour of the rubber blank, and manufacturing the rubber blank on a rubber preforming machine;

[0017] Step 3, cooling the rubber blank to below 50°C;

[0018] Step 4: Using a cutting device, the outer portion of the rubber blank is cut in the thickness direction to form an upper petal and a lower petal;

[0019] Step 5: Assemble the skeleton and the rubber blank so that the side wall of the skeleton is clamped between the upper petal and the lower petal.

[0020] By adopting the above technical solution, the prefabricated rubber blank of the skeleton oil seal can be manufactured stably. The skeleton and the rubber blank are pre-overlapped at a relatively high degree, which facilitates the rubber blank sol to quickly, stably and evenly fill the mold cavity, prevents local material shortage in the molded oil seal, and improves the quality of the skeleton oil seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of the structure of the skeleton and the rubber blank in the mold before molding in the prior art;

[0023] Figure 2 This is a schematic diagram of the structure of a molded skeleton oil seal in a mold in the prior art;

[0024] Figure 3This is a top view of an embodiment of the prefabricated rubber blank of the skeleton oil seal of the present invention;

[0025] Figure 4 This is a bottom view of an embodiment of a prefabricated rubber blank of a skeleton oil seal according to the present invention;

[0026] Figure 5 This is a cross-sectional view of an embodiment of a prefabricated rubber blank for a skeleton oil seal according to the present invention;

[0027] Figure 6 It is a schematic structural diagram of the prefabricated rubber blank of the skeleton oil seal of the present invention in a mold.

[0028] The numbers and letters in the figure represent the names of the corresponding parts:

[0029] 1-skeleton; 11-side wall; 12-circumferential wall; 2-rubber blank; 21-middle interconnection portion; 22-extension portion; 221-dividing seam; 222-upper petal; 223-lower petal; 91-skeleton; 92-rubber blank; 93-skeleton oil seal. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] like Figure 3-6 As shown, in one embodiment of the present invention, a prefabricated rubber blank for a skeleton oil seal includes a detachable skeleton 1 and a rubber blank 2, wherein the skeleton 1 includes a side wall portion 11 and a circumferential wall portion 12, the side wall portion 11 is in a circular ring shape, and the circumferential wall portion 12 extends vertically outward from the outer edge of the side wall portion 11; the rubber blank 2 includes a middle interconnecting portion 21 and a plurality of extension portions 22 distributed in a circumferential array, the extension portions 22 extending outward from the middle interconnecting portion 21; a dividing seam 221 is provided on each extension portion 22, and the dividing seam 221 divides the extension portion 22 into an upper petal 222 and a lower petal 223 in the thickness direction, and the side wall portion 11 of the skeleton is clamped between the upper petal 222 and the lower petal 223.

[0032] The beneficial effects of adopting the above technical solution are: increasing the extension range of the rubber blank, cutting the extension part of the rubber blank into two pieces, and setting them above and below the skeleton respectively. The extension parts have respectively entered the narrow space formed between the skeleton and the mold, which plays a good guiding role for the molten glue after the mold is hot-melted, improving the uniformity of the molten glue flow, improving the molding quality and yield of the skeleton oil seal, and improving production efficiency.

[0033] As shown in Figure 3 , in other embodiments of the present invention, a gap t is provided between the outer edge of the extended portion 22 of the preform and the circumferential wall portion 12 of the frame. This gap t is 1-5 mm. The beneficial effect of this technical solution is that maintaining a small gap maximizes the extension length, improving the fluidity of the sol, while also ensuring that the preform remains stable and consistent on the frame.

[0034] like Figure 3 As shown, in other embodiments of the present invention, the width of the outer extension portion 22 of the rubber blank gradually increases from the base toward the outside. The outer edge width b2 of the outer extension portion 22 is 1.4-1.8 times the base width b1. The beneficial effect of adopting this technical solution is that a reasonable structural design facilitates faster bonding of the outer extension portion sol with the circumferential wall of the skeleton.

[0035] In other embodiments of the present invention, in axial projection, the blank area between adjacent extensions is 0.8-1.2 times the area of ​​a single extension. The beneficial effects of the above technical solution are: ensuring that the sol forms a certain radial flow, improving the global flow performance, and ensuring the uniformity of the sol distribution.

[0036] In other embodiments of the present invention, the number of extensions on a rubber blank is 3-6, preferably 4.

[0037] The manufacturing process of the prefabricated rubber blank of the skeleton oil seal includes the following steps:

[0038] Step 1, punching the skeleton;

[0039] Step 2: manufacturing a tooling with a die shape consistent with the outer contour of the rubber blank, and manufacturing the rubber blank on a rubber preforming machine;

[0040] Step 3, cooling the rubber blank to below 50°C;

[0041] Step 4: Using a cutting device, the outer portion of the rubber blank is cut in the thickness direction to form an upper petal and a lower petal;

[0042] Step 5: Assemble the skeleton and the rubber blank so that the side wall of the skeleton is clamped between the upper petal and the lower petal.

[0043] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable ordinary technicians in this field to understand the content of the present invention and implement it. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A prefabricated rubber blank for a skeleton oil seal, characterized in that: The invention comprises a detachable skeleton and a rubber blank, wherein the skeleton comprises a side wall portion and a circumferential wall portion, wherein the side wall portion is in a circular ring shape and the circumferential wall portion vertically extends outward from the outer edge of the side wall portion; the rubber blank comprises a middle interconnection portion and a plurality of extension portions distributed in a circumferential array, wherein the extension portions extend outward from the middle interconnection portion; a splitting seam is provided on each of the extension portions, wherein the splitting seam divides the extension portion into an upper petal and a lower petal in a thickness direction, and the side wall portion of the skeleton is clamped between the upper petal and the lower petal; There is a gap between the outer edge of the extension of the rubber embryo and the circumferential wall of the skeleton; The width of the rubber embryo extension portion gradually increases from the root to the outside.

2. The prefabricated rubber blank for skeleton oil seal according to claim 1, characterized in that: The gap is 1-5 mm.

3. The prefabricated rubber blank of skeleton oil seal according to claim 1, characterized in that: The width of the outer edge of the extension portion is 1.4-1.8 times the width of the root portion.

4. The prefabricated rubber blank for skeleton oil seal according to claim 3, characterized in that: In axial projection, the blank area between adjacent extensions is 0.8-1.2 times the area of ​​a single extension.

5. A manufacturing process for a prefabricated rubber blank for a skeleton oil seal, used for manufacturing the prefabricated rubber blank for a skeleton oil seal as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1, punching the skeleton; Step 2, manufacturing a tooling with a die shape consistent with the outer contour of the rubber blank, and manufacturing the rubber blank on a rubber preforming machine; Step 3, cooling the rubber blank to below 50°C; Step 4, cutting the outer extension of the rubber blank in the thickness direction to form an upper petal and a lower petal by a cutting device; Step 5, assembling the frame and the rubber blank so that the side wall of the frame is clamped between the upper petal and the lower petal.

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