CN202500981U

CN202500981U - Engine camshaft timing gear

Info

Publication number: CN202500981U
Application number: CN2012200306102U
Authority: CN
Inventors: 霍英贤; 孙磊
Original assignee: SAIC Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2012-01-31
Filing date: 2012-01-31
Publication date: 2012-10-24
Anticipated expiration: 2022-01-31

Abstract

The utility model discloses an engine camshaft timing gear. A shaft hole (2) is arranged in the center of the timing gear (1), and a boss (3) is arranged around the shaft hole (2), wherein the boss can match with a concave stage in the front end of a camshaft and increase the contact area to increase the rotation torque; arc pins (4) are arranged around the boss (3), wherein the arc pins can match with a journal in the front end of the camshaft, carry out positioning, further increase the contact area to increase the rotation torque, prevent the gear from skidding, and guarantee normal operation of the engine. Thus, stress concentration of key-type connection is not generated, and the connection is reliable.

Description

A kind of camshaft timing gear of motor

Technical field

The utility model relates to the engine apparatus field, relates in particular to a kind of camshaft timing gear of motor.

Background technique

The function of camshaft timing gear mainly is that the power that in engine operation, bent axle is transmitted is delivered on the camshaft through timing chain, drives valve mechanism opening and closing on time to reach, and makes motor be able to the purpose of continuous operation.

The design of camshaft timing gear and assembling are very important, and it is directly connected to the port timing of motor, open the morning of valve and close late, thereby have influence on the Economy and the power character of motor.If too much can make valve and the piston that differ correct time are answered back to, motor can't be worked even scrap.

At present, timing gear are to navigate to the camshaft front end through independent positioning key, concentrate but independent key connects the easy stress that produces; If do not establish positioning key; And it is less to depend merely on the driving torque that the friction of timing gear and camshaft front-end face provides, when timing gear high pulling torque occurs and rotate, and the hidden danger that exists timing gear " to skid "; Can cause the entanglement in correct time, motor can't proper functioning.

The model utility content

Use the key ease of connection to produce the defective that stress is concentrated to the engine cam timing gear, the utility model technical problem to be solved provides a kind of stress that can not produce and concentrates, connects reliable engine cam timing gear.

In order to solve the problems of the technologies described above, the technological scheme that the utility model adopted is: a kind of camshaft timing gear of motor, comprise gear, and Gear center is provided with axis hole, is provided with boss around the axis hole, is provided with arc-shaped pins around the boss.

Arc-shaped pins has 3, evenly distributes.

The reverse side of arc-shaped pins place face is provided with lightening hole on the gear.

Be provided with lightening hole between the gear teeth of arc-shaped pins and gear.

The advantage of the utility model is: be furnished with boss around the timing gear axis hole, with the area of contact of increase with the camshaft front end.The boss peripheral disposition has equally distributed arc-shaped pins; Can make the timing gear accurate in locating at the camshaft front end; Arc-shaped pins contacts with the camshaft bearing journal outward edge simultaneously, further increases area of contact, increases driving torque; The phenomenon of avoiding timing gear " to skid " guarantees the normal operation of motor.Under the situation that guarantees arc-shaped pins intensity, the lightening hole of setting, the lightening hole that is provided with between the gear teeth of arc-shaped pins and gear all is in order to alleviate the overall weight of timing gear.

Description of drawings

Fig. 1 is the structural representation of the camshaft timing gear of the utility model motor;

Fig. 2 is the camshaft timing gear assembly structure schematic representation of the utility model motor;

Mark among the above-mentioned figure is: 1, timing gear, 2, axis hole, 3, boss, 4, arc-shaped pins, 5, lightening hole, 6, camshaft, 7, bolt, 8, lightening hole.

Embodiment

Fig. 1 expresses the structure of the camshaft timing gear of the utility model motor, and camshaft timing gear 1 global shape is the bowl type, can obtain through powder metallurgy method.Be assembled to 6 last times of camshaft, correct time median plane more near cylinder body, cylinder cap, make correct time train overall structure compact more.The center arrangement of timing gear 1 has axis hole 2, and the arranged around of axis hole 2 has boss 3, when contacting with camshaft, increases area of contact.Simultaneously, boss 3 peripheral disposition have three equally distributed arc-shaped pins 4, can make the timing gear accurate in locating at the camshaft front end; While three equally distributed arc-shaped pins; Contact with the camshaft bearing journal outward edge, further increase area of contact, increase driving torque.In order to alleviate the overall weight of timing gear, be furnished with equally distributed six lightening holes 5 between the gear teeth of arc-shaped pins 4 and gear 1.

Fig. 2 is the camshaft timing gear assembly structure schematic representation of the utility model motor; When assembling, through arc-shaped pins 4 timing gear 1 are navigated to the camshaft front end, and be fixed on the front-end face of camshaft 6 through bolt 7; Because axis hole 2 arranged around have boss 3; And the shrinkage pool that boss 3 can match with the camshaft end face contacts, and increases the area of contact between timing gear 1 and camshaft, to increase its driving torque.In arc-shaped pins 4 guide-localizations, arc-shaped pins 4 contacts with the outer edge surface of camshaft bearing journal, further increases area of contact, thereby further increases driving torque.When timing gear carry out torque drive, effectively avoid the phenomenon of " skidding ", guarantee the normal operation of motor.The reverse side of arc-shaped pins 4 place faces is furnished with lightening hole 8 on the timing gear 1, under the situation that guarantees arc-shaped pins semi-finals degree, is provided with three lightening holes 8.The height of boss about 0.5mm since boss 3 around to have arc-shaped pins 4, timing gear be to cooperate with the camshaft front end through arc-shaped pins 4, guaranteeing its accurate location, so that boss 3 there is no need is too high.If boss 3 is too low, then lose the meaning that increases area of contact.

Claims

1. the camshaft timing gear of a motor comprises gear (1), and said gear (1) center is provided with axis hole (2), it is characterized in that, said axis hole (2) is provided with boss (3) on every side, and said boss (3) is provided with arc-shaped pins (4) on every side.

2. the camshaft timing gear of motor as claimed in claim 1 is characterized in that, said arc-shaped pins (4) has 3, evenly distributes.

3. according to claim 1 or claim 2 the camshaft timing gear of motor is characterized in that the reverse side that said gear (1) is gone up arc-shaped pins (4) place face is provided with lightening hole (8).

4. the camshaft timing gear of motor as claimed in claim 3 is characterized in that, is provided with lightening hole (5) between the gear teeth of said arc-shaped pins (4) and said gear (1).