CN203309056U - Root digging tooth form - Google Patents

Abstract

The utility model relates to the tooth form of a gear, in particular to a root digging tooth form. The problem that steps and the like are generated after a traditional tooth form is ground can be solved. The root digging tooth form comprises a tooth, and an arc-shaped root digging groove is formed at the position of the root of the tooth. The root digging tooth form comprises three parameters, that is, the root digging groove arc radius, the root digging quantity and the effective tooth form diameter, wherein the root digging groove arc radius R is 0.4m, the root digging quantity , and the effective tooth form diameter . The manufactured gear has certain root concave quantity at the position of the root of the tooth, and therefore the steps can be effectively prevented from being generated after the tooth form is ground.

Description

A kind of profile of tooth of uprooting

Technical field

The utility model relates to tooth-formation of gear, is specially a kind of profile of tooth of uprooting.

Background technique

At present, the heavy duty hardened face gear will carry out grinding after carburizing and quenching, for avoiding in grinding process producing the flexural strength that step reduces gear, during gear teeth, need process with the pre-grinding hob with major and minor cutting edge with round end, the gear processed has the recessed amount of certain root at the tooth root place, the profile of tooth of namely uprooting, can effectively avoid the generation of grinding backward step.And there is a certain amount of undercut at the tooth root place of mill front gear, and can guarantee that gear tooth root place after grinding can rounding off or leave micro-undercut, reason is as follows: 1. from gear-grinding process, pre-grinding hob tooth root place leaves certain undercut amount, in grinding process, can play the effect of clearance groov; 2. from residual stress after the heat of gear, after gear carburizing quenching, the residual stress on gear root top layer is pressure stress, and the tensile stress that in the time of offsetting the gear stand under load, the tooth root place is subjected to, the resistance to flexure that at this moment improves gear are very favourable.The grinding tooth root can make surperficial residual stress become tensile stress, thereby makes the resistance to flexure of the gear teeth reduce by 17%～20%; 3. from the flexural strength of gear, the roll flute front gear does not have undercut, and after roll flute, the tooth root place can produce step, forms larger stress and concentrates, the serious anti-broken teeth ability that affects gear.

At present, the gear major part in various retarders still adopts the gear of common profile of tooth, if in retarder, promote the use of from now on the gear of this profile of tooth of uprooting, not only reduces the wearing and tearing of gear, improves simultaneously the working life of retarder.

Summary of the invention

The purpose of this utility model is to solve after traditional profile grinding of gear the problem that produces step etc., and a kind of profile of tooth of uprooting is provided.

The technical solution of the utility model is, a kind of profile of tooth of uprooting, comprise tooth, in the tooth root position, is provided with the groove of uprooting of circular arc, and the profile of tooth of uprooting comprises three parameters radius of arc of uprooting , the amount of uprooting With effective profile of tooth diameter

The described groove radius of arc of uprooting The amount of uprooting

, effective profile of tooth diameter

.

The profile of tooth of uprooting described in the utility model, the gear processed have the recessed amount of certain root at the tooth root place, can effectively avoid the generation of grinding backward step.And there is a certain amount of undercut at the tooth root place of mill front gear, and can guarantee that gear tooth root place after grinding can rounding off or leave micro-undercut.From on gear-grinding process, pre-grinding hob tooth root place leaves certain undercut amount, in grinding process, can play the effect of clearance groov; From residual stress after the heat of gear, after gear carburizing quenching, the residual stress on gear root top layer is pressure stress, and the tensile stress that in the time of offsetting the gear stand under load, the tooth root place is subjected to can improve the resistance to flexure of gear.

The accompanying drawing explanation

Fig. 1 is structural representation of the present utility model

In figure: 1-tooth, the 2-groove of uprooting.

Embodiment

As schematically shown in Figure 1,A kind of profile of tooth of uprooting, comprise tooth 1, in the tooth root position, is provided with the groove 2 of uprooting of circular arc, described groove 2 radius of arc of uprooting

The amount of uprooting

Effective profile of tooth diameter

In formula: ---modulus,

---working pressure angle;

---meshed center distance;

---the top circle diameter be meshed;

---the rolling circle diameter be meshed;

---the base circle diameter (BCD) of this gear.

The radius of arc of uprooting is large, gets

, after roll flute, can not produce step like this, avoid stress to concentrate; And common profile of tooth radius of arc is little, generally get

, can produce step after roll flute.

Claims (1)

1. the profile of tooth of uprooting, comprise tooth (1), in the tooth root position, is provided with the groove of uprooting (2) of circular arc, and the profile of tooth of uprooting comprises three parameters radius of arc of uprooting , the amount of uprooting

With effective profile of tooth diameter

It is characterized in that: the described groove radius of arc of uprooting

The amount of uprooting

, effective profile of tooth diameter

,

In formula:

---modulus,

---working pressure angle;

---meshed center distance;

---the top circle diameter be meshed;

---the rolling circle diameter be meshed;

---the base circle diameter (BCD) of this gear.

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