CN215171874U

CN215171874U - Light engine balance shaft gear and engine balance shaft system

Info

Publication number: CN215171874U
Application number: CN202121289304.6U
Authority: CN
Inventors: 朱波
Original assignee: Suzhou Xingbo Power Technology Co ltd
Current assignee: Suzhou Xingbo Power Technology Co ltd
Priority date: 2021-06-09
Filing date: 2021-06-09
Publication date: 2021-12-14
Anticipated expiration: 2031-06-09

Abstract

The utility model relates to a balanced shaft gear of lightweight engine, including gear body, metal support portion and the rim of a tooth portion of injection moulding on the metal support portion periphery, rim of a tooth portion is formed by modified plastic injection moulding, the metal support portion has set gradually axle hole section, spoke section and gomphosis face section from the centre outwards, the spoke section is the disc structure of taking the centre bore, the border is equipped with respectively along axially extended chimb around the centre bore, the axle hole section is cylindrical tubular structure, its front and back end has the turn-ups of tightly wrapping along radial extension the chimb, the gomphosis face section is the ring structure, it sets up on the periphery of spoke section, evenly distributed has a plurality of archs on the gomphosis face section periphery, be equipped with on the inner wall of rim of a tooth portion with protruding matched with recess; still relate to an engine balance shaft system that adopts above-mentioned balance shaft gear. The gear can be manufactured by adopting an injection molding process, the production efficiency can be improved, the production cost is reduced, an embedded damping mechanism scheme is not required, the structure is simple, the weight is light, and the noise is low.

Description

Light engine balance shaft gear and engine balance shaft system

Technical Field

The utility model relates to an automobile engine spare part, especially a lightweight engine balance shaft gear and engine balance shaft system.

Background

The conventional engine balance shaft system structure comprises four parts: balance shaft gear, bent axle ring gear and balance shaft. During the operation of the engine, the reciprocating inertia force generated by the balance weight of the balance shaft is used for offsetting the reciprocating inertia force generated by the operation of the engine through the meshing of the crankshaft gear ring and the balance shaft gear, so that the vibration of the engine is reduced.

The current automobile engine balance shaft gear system is mainly divided into a metal gear and a thermosetting plastic gear. The engine balance shaft system based on the metal gear and the thermosetting plastic gear needs to be machined to manufacture the gear, and has the defects of low production efficiency, high manufacturing cost and the like. The metal gear cannot effectively absorb torsional vibration of the engine due to metal rigidity, and the torsional vibration of the engine is absorbed by adopting a mode that rubber or a damping mechanism is embedded in an inner ring, so that the structure is complex, the cost is high, and the reliability is poor.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a technical problem who solves is: overcomes the defects in the prior art and provides a light engine balance shaft gear.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a balanced shaft gear of lightweight engine, includes the gear body, is in including metal support portion and injection moulding the rim portion in the metal support portion periphery, rim portion is moulded plastics by modified plastics and is formed, the metal support portion outwards has set gradually axle hole section, spoke section and gomphosis face section from the centre, the spoke section is the disc structure of taking the centre bore, the border is equipped with respectively along the chimb of axial extension around the centre bore, the axle hole section is cylindrical tubular structure, and its front and back end has and radially extends to wrap tightly the turn-ups of chimb, the gomphosis face section is the ring structure, and it sets up in the periphery of spoke section, and evenly distributed has a plurality of archs on the gomphosis face section periphery, be equipped with on the inner wall of rim portion with protruding matched with recess.

The gear body is designed to be composed of an inner metal supporting part and an outer injection molding gear ring part, the whole weight is reduced, and the gear ring part is formed by injection molding of modified plastics, so that the gear body has the functions of high strength, wear resistance and high temperature resistance; the shaft hole section front and rear ends have the turn-ups along the border chimb around radially extending the tight spoke section centre bore, and overall structure fastness further promotes, and the protruding circumference cohesion that can improve gomphosis face section and ring gear portion.

Further, the protrusion is in a semi-cylindrical structure, and the two sides of the protrusion are in concave arc transition with the peripheral surface of the embedding surface section.

The bulge is of a semi-cylindrical structure, so that the strength is ensured, and materials are saved; the two sides of the protrusion and the peripheral surface of the embedded surface section are in concave arc transition, so that the gear ring part and the embedded surface section are more firmly connected, and the locking force is increased.

Further, the half area of the spoke section is provided with weight reducing holes which are symmetrically distributed.

Because half of the balance shaft is solid, the solid part has no hole, firstly, in order to save cost, the solid part is equivalent to a balancing weight, the weight of the gear body is reduced, and secondly, the reciprocating inertia force generated by the running of the engine is balanced.

In order to ensure the stability of the gear body during rotation, the weight-reducing holes are further limited to be waist-shaped structures, and two weight-reducing holes are arranged and are symmetrically distributed.

Further, the ring gear portion is provided with an oil hole.

The utility model discloses another technical problem who solves is: the defects in the prior art are overcome, and the engine balance shaft system is provided.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides an engine balance shaft system, includes bent axle, bent axle ring gear and balance shaft, still includes the balance shaft gear as in above-mentioned scheme, the one end at the balance shaft is installed to the balance shaft gear, the bent axle ring gear is installed in the one end of bent axle, bent axle ring gear and balance shaft gear engagement, the bent axle ring gear includes that inside metal support section and injection moulding are in outside ring gear section on inside metal support section periphery.

The original metal gears of the crankshaft gear ring and the balance shaft gear are replaced by the gear with the external wear-resistant, high-temperature-resistant and engine oil-resistant thermoplastic material gear ring and the internal metal support, and the gear is consistent with the original engine balance shaft system and can be directly replaced; can adopt injection molding process to produce and make the gear, very big promotion production efficiency, reduced manufacturing cost, because the shock attenuation of plastics itself is inhaled the shake characteristic, need not to adopt embedded damper scheme, realized simple structure, light in weight, noise low grade advantage.

The utility model has the advantages that: compared with a metal gear, the utility model simplifies the structure and lightens the whole weight of the system; secondly, as the thermoplastic material gear is replaced, the working noise of the whole system is reduced, and the vibration is reduced; compared with the original structure, the structure of torsional vibration reduction is cancelled, the machining production process is cancelled, and the gear is produced by adopting the insert injection molding or direct injection molding mode, so that the weight and the production cost of the system are reduced, the production efficiency is improved, and the operation noise is reduced; compared with a thermosetting gear, the gear has the advantages that the machining process is omitted, the gear can be directly molded by injection molding, the production cost is greatly reduced, and the production efficiency is improved.

Drawings

The present invention will be further described with reference to the accompanying drawings and embodiments.

Fig. 1 is a schematic structural view of the balance shaft gear of the lightweight engine of the present invention.

Fig. 2 is a schematic structural view of the metal support part in fig. 1.

Fig. 3 is a schematic view of the structure of the rim portion of fig. 1.

Fig. 4 is a schematic structural diagram of the engine balance shaft system of the present invention.

Fig. 5 is a schematic view of the structure of the ring gear of the crankshaft of fig. 4.

Fig. 6 is a schematic structural view of the inner metal support section of fig. 5.

Fig. 7 is a schematic structural view of the outer ring gear segment of fig. 5.

In the figure: 1. the gear comprises a gear body, 11 a metal supporting part, 12 a gear ring part, 111 a shaft hole section, 112 a spoke section, 113 a fitting surface section, 1111 a flanging, 1121 a flange, 1131 a protrusion, 11311 an arc transition, 121 a groove, 122 an oil hole, 2 a crankshaft, 3 a crankshaft gear ring, 4 a balance shaft, 1' a balance shaft gear, 31 an inner metal supporting section, 32 an outer gear ring section, 311 a protruding part and 321 an inner concave part.

Detailed Description

The invention will now be further described with reference to the accompanying drawings. The drawings are simplified schematic diagrams only illustrating the basic structure of the present invention in a schematic manner, and thus show only the components related to the present invention.

As shown in fig. 1, a lightweight engine balance shaft gear includes a gear body 1 including a metal support portion 11 and a rim portion 12 injection-molded on an outer periphery of the metal support portion 11.

As shown in fig. 2, the metal supporting portion 11 is sequentially provided with a shaft hole section 111, a spoke section 112 and an embedding surface section 113 from the middle to the outside, the spoke section 112 is a disc structure with a central hole, the front edge and the rear edge of the central hole are respectively provided with a convex edge 1121 extending along the axial direction, the shaft hole section 111 is a cylindrical tubular structure, the front end and the rear end of the shaft hole section are provided with flanges 1111 extending along the radial direction and tightly wrapping the convex edge 1121, the embedding surface 113 section is a circular ring structure and is arranged on the periphery of the spoke section 112, a plurality of protrusions 1131 are uniformly distributed on the periphery of the embedding surface section 113, the protrusions 1131 are semi-cylindrical structures, and the two sides of the protrusions and the peripheral surface of the embedding surface section 113 are in a concave circular arc transition 11311; a half area of the spoke segment 112 is provided with two symmetrically distributed lightening holes 1121, and the lightening holes 1121 are in a waist-shaped structure, and the two lightening holes 1121 are symmetrically distributed.

The metal supporting part 11 can be made of high-strength rare earth aluminum alloy materials besides conventional metals including stainless steel and powder metallurgy materials, and has the characteristics of light weight, high strength, easiness in processing, corrosion resistance and the like. The material compositions are classified into two types as shown in the following table 1 and table 2 according to the strength:

TABLE 1

Element(s)

Zn

Mg

Cn

Mn

Rare earth bag

Al

Ingredient/wt%

6.0-9.0

2.0-3.0

0.3-1.5

0.3-1.0

0.5-1.0

Balance of

TABLE 2

As shown in fig. 3, the ring gear portion 12 is made of modified plastic by injection molding, and a groove 121 is formed on an inner wall of the ring gear portion 12 to match with the protrusion 1121. The ring gear portion 12 is provided with an oil hole 122.

According to the working temperature, the working strength and the cylinder number of the engine, different modified thermoplastic materials of the forming ring part 12 are selected according to different working torques of the balance shaft gear, and the modified thermoplastic materials are high-strength, high-temperature-resistant and wear-resistant thermoplastic materials which are prepared from one or more of PA (polyamide), PPA (polyphthalamide), PPS (polyphenylene sulfide), PEI (polyetherimide), PEEK (polyether ether ketone) or TORLON (polyamide-imide) and added with modifiers such as glass fiber, mineral powder or carbon fiber.

As shown in fig. 4, an engine balance shaft system includes a crankshaft 2, a crankshaft ring gear 3 and a balance shaft 4, and further includes a balance shaft gear 1 ' of the above embodiment 1, the balance shaft gear 1 ' is installed at one end of the balance shaft 4, the crankshaft ring gear 3 is installed at one end of the crankshaft 2, and the crankshaft ring gear 3 is engaged with the balance shaft gear 1 ', and as shown in fig. 5, the crankshaft ring gear 3 includes an inner metal support section 31 and an outer ring gear section 32 injection-molded on the outer periphery of the inner metal support section 31.

As shown in fig. 6 to 7, the inner metal supporting section 31 is provided with a protrusion 311 on the outer periphery thereof, the protrusion having the same structure as the protrusion 1131 of the metal supporting portion 11 on the balance shaft gear 1 ', and the outer ring gear section 32 is provided with an inner recess 321 on the inner side wall thereof, the inner recess having the same structure as the recess 121 of the upper ring gear 12 on the balance shaft gear 1'.

In addition, the inner metal supporting section 31 of the crankshaft ring gear 3 and the metal supporting portion 11 of the balance shaft gear 1' may be assembled to the crankshaft 2 and the balance shaft 4, respectively, by means of bolting, hot-press fitting, and the like.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable people skilled in the art to understand the contents of the present invention and implement the present invention, and the protection scope of the present invention can not be limited thereby, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides a balanced shaft gear of lightweight engine, includes the gear body, is in including metal support portion and injection moulding the rim of a tooth portion on the metal support portion periphery, rim of a tooth portion is moulded plastics by modified plastics and is formed its characterized in that: the metal supporting part is provided with a shaft hole section, a spoke section and an embedded surface section from the middle to the outside in sequence, the spoke section is of a disc structure with a center hole, convex edges extending along the axial direction are arranged on the front edge and the rear edge of the center hole respectively, the shaft hole section is of a cylindrical tubular structure, the front end and the rear end of the shaft hole section are provided with turned edges extending along the radial direction and tightly wrapping the convex edges, the embedded surface section is of a ring structure and is arranged on the periphery of the spoke section, a plurality of bulges are uniformly distributed on the periphery of the embedded surface section, and grooves matched with the bulges are formed in the inner wall of the gear ring section.

2. The light-weight engine balance shaft gear according to claim 1, characterized in that: the protrusion is in a semi-cylindrical structure, and the two sides of the protrusion are in concave arc transition with the outer peripheral surface of the embedded surface section.

3. The light-weight engine balance shaft gear according to claim 1, characterized in that: and a half area of the spoke section is provided with symmetrically distributed lightening holes.

4. The light-weight engine balance shaft gear according to claim 3, characterized in that: the lightening holes are of a waist-shaped structure, and two lightening holes are symmetrically distributed.

5. The light-weight engine balance shaft gear according to claim 1, characterized in that: and the gear ring part is provided with an oil hole.

6. The utility model provides an engine balance shaft system, includes bent axle, bent axle ring gear and balance shaft, its characterized in that: the balance shaft gear of any one of claims 1 to 5, further comprising a balance shaft gear mounted at one end of the balance shaft, wherein the crankshaft gear ring is mounted at one end of the crankshaft, the crankshaft gear ring is engaged with the balance shaft gear, and the crankshaft gear ring comprises an inner metal support section and an outer gear ring section injection-molded on the outer periphery of the inner metal support section.