CN215242472U - Gearbox sealing piston injection mold - Google Patents

Abstract

The utility model discloses a gearbox sealing piston injection mould, which comprises a mould main body, wherein the mould main body consists of an upper mould core, a lower mould core and an injection structure, the injection structure is arranged on the upper mould core, and a shunting structure is arranged on the lower mould core; the shunt channel structure is composed of a base and two gaskets, wherein the two gaskets are arranged on the base, and a middle injection point is arranged on the base. In this way, the utility model relates to a sealed piston injection mold of gearbox, this injection mold are to the sealed lip design of multizone, and sealing area keeps apart completely, adopts subchannel structure injection to replace umbelliform annular injection, can be so that inject the in-process with the mould intracavity gaseous save in the gas well or discharge chamber outside to guarantee that the lip is regional smooth, do not have any microbubble, thereby guarantee sealed effect, make the piston oil blanket power transmission when the gear switches stable.

Description

Gearbox sealing piston injection mold

Technical Field

The utility model belongs to the technical field of the vapour turning mold utensil and specifically relates to a gearbox sealing piston injection mold is related to.

Background

A sealing piston of an automobile gearbox is generally formed by vulcanizing and bonding a metal piece for providing structural strength and rubber for providing sealing capacity under the conditions of certain time, temperature and pressure, an initial forming method is formed by vulcanizing a flat plate for mould pressing, but the method needs to manually prepare a rubber block in advance and manually place the rubber block into a mould cavity during vulcanization, so that the labor cost for manufacturing the product is overhigh, the period for producing a single product is overlong, the related processing procedures are excessive and are gradually replaced by injection molding, the injection molding method does not need to prepare the rubber block in advance, rubber strips can be directly injected into the mould for vulcanization through a feeding system of equipment, the preparation procedure of the rubber block is omitted, the rubber can be plasticized in an injection cylinder of the equipment before injection, the vulcanization time is further reduced, and the production efficiency is improved, but because the rubber enters the mould from the original manual arrangement, the structure requirement of the mould is higher by the multi-point injection at present, especially for the design of a multi-area sealing lip, see the attached figure 1 of the specification, wherein a is a metal framework, b and c are rubbers, the sealing of the area b and the sealing of the area c are completely separated, taking the product as an example, the size of the sealing lip at the area b is about 100mm, the area adopts 2-point injection, the lip at the area c is about 60mm, the area adopts 1 middle point of umbrella-shaped injection, the integral injection structure is seen in the attached figure 2 of the specification, after the product is molded, the surface of the lip at the area c displays small convex points of dense hemp, see the attached figure 3 of the specification, when the product is seen from the side, as the attached figure 4 of the specification, the shape of a knob, when the product is seen in a magnifying glass with a magnification of 20 times, see the attached figure 5 of the specification, this characteristic can lead to the piston to lead to leaking in when hydraulic oil drive for pressure transmission is not enough and the appearance shifts gears unsmoothly, through verification analysis (adopt the die sinking to exhaust and manual rubber of placing to verify), middle rubber is when the injection, because gearbox space restriction, fashioned product structure makes the lip apart from the difference in height e of f end great, rubber gets into by d department annular in the die cavity, when not being full of the inner lip completely yet, rubber just flows to the trunk line, approach f department, the gas that can lead to the inner lip department of branch road like this can't be got rid of, thereby produce the microbubble.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the main technical problem who solves provides a gearbox sealing piston injection mold, can solve the problem that the inner lip produced the microbubble.

In order to solve the technical problem, the utility model discloses a technical scheme be: a sealed piston injection mold for a gearbox comprises a mold main body, wherein the mold main body consists of an upper mold core, a lower mold core and an injection structure, the injection structure is arranged on the upper mold core, and a runner structure is arranged on the lower mold core;

the flow dividing channel structure is composed of a base and two gaskets, wherein the two gaskets are installed on the base, a middle injection point is arranged on the base, the two gaskets are symmetrically installed on the upper surface of the base by taking the middle injection point as a circle center, the gaskets are in a semi-circular sector shape, the two horizontal edges of the two semicircular sector gaskets form two flow channels which are symmetrical by taking the middle injection point as a center, and a gas well is formed at the top end of each semi-circular sector gasket.

In a preferred embodiment of the present invention, the lower mold core is provided with a mounting groove.

In a preferred embodiment of the present invention, the runner structure is installed in the installation groove.

In a preferred embodiment of the present invention, the mounting groove is matched with the runner structure.

In a preferred embodiment of the present invention, the outer wall of the base is provided with a chamfer near the lower side.

In a preferred embodiment of the present invention, the base is provided with a plurality of bolt fixing holes.

In a preferred embodiment of the present invention, a plurality of the bolt fastening holes are distributed in a circular array around the middle injection point.

In a preferred embodiment of the present invention, the base further has positioning holes.

The utility model has the advantages that: the utility model relates to a gearbox sealing piston injection mold, this injection mold are to the design of multizone sealing lip, and sealing area keeps apart completely, adopts the injection of subchannel structure to replace umbelliform annular injection, can be so that deposit the intracavity gas with the mould outside gas well or discharge chamber at the injection in-process to guarantee that the lip is regional smooth, do not have any micro bubble, thereby guarantee sealed effect, make the piston oil blanket power transmission when the gear switches stable.

Drawings

FIG. 1 is a schematic diagram of a piston side of a sealed piston injection mold for a transmission.

Fig. 2 is a schematic structural diagram of a gearbox sealing piston injection mould.

FIG. 3 is a front view of a transfer case seal piston injection mold runner configuration.

Fig. 4 is a cross-sectional view taken at a-a in fig. 3.

Fig. 5 is a cross-sectional view at B-B in fig. 3.

Fig. 6 is a cross-sectional view at C-C in fig. 3.

Fig. 7 is a cross-sectional view taken at D-D in fig. 3.

The parts in the drawings are numbered as follows: 1. an upper mold core; 2. a lower mold core; 3. an injection structure; 4. a shunt structure; 5. a base; 6. chamfering; 7. a gasket; 8. a flow channel; 9. a bolt fixing hole; 10. positioning holes; 11. a gas well; 12. the middle injection point.

Detailed Description

The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more easily understand the advantages and features of the present invention, and to make more clear and definite definitions of the scope of the present invention.

According to the figures 1 to 7, the sealed piston injection mold of the gearbox comprises a mold main body, wherein the mold main body is composed of an upper mold core 1, a lower mold core 2 and an injection structure 3, the injection structure 3 is installed on the upper mold core 1, a shunt structure 4 is installed on the lower mold core 2, and the shunt structure 4 is adopted to replace umbrella-shaped annular injection, so that gas in a mold cavity can be stored outside a gas well 11 or a discharge cavity in the injection process, the smooth lip area is ensured, no micro bubbles exist, the sealing effect is ensured, and the power transmission of a piston oil seal is stable when the gears are switched.

The lower mold core 2 is provided with a mounting groove, the sub-runner structure 4 is mounted in the mounting groove, and the mounting groove is matched with the sub-runner structure 4, so that the sub-runner structure 4 can be firmly mounted on the lower mold core 2.

The sub-runner structure 4 is composed of a base 5 and two gaskets 7, the two gaskets 7 are mounted on the base 5, a middle injection point 12 is arranged on the base 5, the middle injection point 12 is used for injecting rubber by the injection structure 3, and the injection structure 3 adopts a common structure, so that excessive description is not provided in the embodiment.

Two the gasket 7 with the installation of middle injection point 12 as the centre of a circle symmetry the base 5 upper surface, gasket 7 is semicircle fan-shaped, semicircle fan-shaped two the horizontal limit of gasket 7 constitutes two with middle injection point 12 is central symmetry's runner 8, semicircle fan-shaped gas well 11 has been seted up to gasket 7 top, subchannel structure 4 is by 1 middle injection point 12, 2 the runner 8, 2 the terminal confluence department of rubber gas well 11 constitutes, lets rubber meet at the confluence department at back of the body flow end, saves air 2 in the gas well 11, simultaneously because when rubber flows upwards, the speed reduces before comparing by a wide margin, avoids "torrent" to flow, also makes the air of lip department can effectually discharge from f department top.

5 outer walls of base are close to downside department and are equipped with chamfer 6, chamfer 6 is convenient subchannel structure 4 with the assembly of mounting groove.

A plurality of bolt fixing holes 9 are formed in the base 5, the bolt fixing holes 9 are distributed in a circular array by taking the middle injection point 12 as a circle center, and the bolt fixing holes 9 are used for fixing the sub-runner structure 4 in the mounting groove.

The base 5 is further provided with a positioning hole 10, and the positioning hole 10 is used for positioning the shunt channel structure 4 when the shunt channel structure is installed in the installation groove.

Compared with the prior art, the utility model relates to a sealed piston injection mold of gearbox, this injection mold are to the sealed lip design of multizone, and sealing area keeps apart completely, adopts the injection of subchannel structure to replace umbelliform annular injection, can be so that inject the in-process with the mould intracavity gas save outside gas well or discharge chamber to guarantee that the lip is regional smooth, do not have any microbubble, thereby guarantee sealed effect, make the piston oil blanket power transmission when the gear switches stable.

With the air discharge chamber in the mould outside to there is not the bubble in the rubber when guaranteeing the product shaping, this is required rubber to follow by near and far away when flowing, from inside to outside, should not lead to "torrent" to fill at the excessive speed, it is great at lip diameter size, be greater than 50mm, lip and terminal rubber cladding height fall are too big, when being greater than 3mm, the air with in the die cavity that the subchannel structure injection can be fine is caught up to by the gas well, and outside the air discharge die cavity with in the lip, thereby the problem that the inner lip produced the small bubble has been solved.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the products of the present invention are usually placed when used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element to which the term refers must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims (8)

1. A sealed piston injection mold of a gearbox comprises a mold main body, wherein the mold main body consists of an upper mold core, a lower mold core and an injection structure, the injection structure is arranged on the upper mold core, and the sealed piston injection mold is characterized in that a runner structure is arranged on the lower mold core;

the flow dividing channel structure is composed of a base and two gaskets, wherein the two gaskets are installed on the base, a middle injection point is arranged on the base, the two gaskets are symmetrically installed on the upper surface of the base by taking the middle injection point as a circle center, the gaskets are in a semi-circular sector shape, the horizontal edges of the two semi-circular sector gaskets form two flow channels which are symmetrical by taking the middle injection point as a center, and a gas well is formed at the top end of the semi-circular sector gasket.

2. The gearbox sealing piston injection mold of claim 1, wherein the lower mold core is provided with a mounting groove.

3. The gearbox seal piston injection mold of claim 2, wherein the runner structure is mounted in the mounting groove.

4. The gearbox seal piston injection mold of claim 2, wherein the mounting groove mates with the runner structure.

5. The gearbox seal piston injection mold of claim 1, wherein the outer base wall is chamfered proximate the underside.

6. The gearbox sealing piston injection mold of claim 1, wherein a plurality of bolt fixing holes are formed in the base.

7. The gearbox sealing piston injection mold of claim 6, wherein a plurality of the bolt fastening holes are distributed in a circular array with the center of the middle injection point as a circle center.

8. The gearbox sealing piston injection mold of claim 1, wherein the base is further provided with a positioning hole.

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