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The specific structure of the single roller cone bit

Views: 301     Author: Site Editor     Publish Time: 2021-09-01      Origin: Site

The structure of the single roller cone bit is fine and complex, with a wide range of components. In-depth knowledge of its internal structure helps us to understand the study of single roller cone bits and paves the way for the use and development of single roller cone bits. The following are the main components of the single roller cone bit.


Here is the content list:

  • Cone structure of single roller cone bit.

  • Bearing system structure and classification of single roller cone bit.

  • Oil storage lubrication sealing system of single roller cone bit.

  • Hydraulic structure of single roller cone bit.



Cone structure of single roller cone bit.

The cone of a single roller cone bit is a cone made of forged alloy steel, the conical surface of the wheel is either milled out with teeth (milled tooth bits) or set with carbide teeth (set tooth bits), there is a bearing runway and a shoulder inside the wheel, and the outer cone of the wheel has two or more tapers.

Single roller cone bits have a tapered wheel consisting only of the main cone and a back cone; compound cone wheels consist of the main cone, a secondary cone, and a back cone, some of which have two secondary cones.

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Bearing system structure and classification of single roller cone bit.

The bearing of the single roller cone bit consists of the inner cavity of the toothed wheel, the bearing runway, the tooth claw journal, and the locking element. There are four bearing pairs: large, medium (locking), small, and thrust bearings.

According to the sealing or not of the single roller cone bit bearing, it can be divided into two categories: sealed and non-sealed.

According to the structure of the bearing pair, the single roller cone bit bearing is divided into two categories: rolling bearings and sliding bearings, which are the main load-bearing (i.e. large bearings). Rolling bearing structure form has "roller - ball - roller - thrust" and "roller a ball a sliding a thrust" two types; sliding bearing structure has "sliding - rolling - rolling - thrust". The structure has "sliding - rolling - sliding a thrust" and "sliding a sliding a sliding a thrust" two kinds.

Oil storage lubrication sealing system of single roller cone bit.

The oil storage and lubrication sealing system of the single roller cone bit is mainly composed of oil storage, oil passage, and sealing.

The oil storage bladder of the single roller cone bit is made of rubber, which stores oil inside and connects to the ring hollow outside. During operation, the vibration of the drill bit causes suction inside the bearing, while the mud pressure acts on the oil bladder to compress it so that the lubricating oil inside the oil bladder continuously enters the bearing through the over-oil hole to lubricate the bearing. At the same time, the seal prevents the mud from entering the bearing system and prevents the lubricant from leaking out.

Hydraulic structure of single roller cone bit.

1.Hydraulic structure of single roller cone bit: the drilling fluid flows through the drill bit nozzle to form a flow field at the bottom of the well. The change in the flow field at the bottom of the well is related to the number, shape, and spatial structure parameters of the nozzles. The number, size, and shape of the nozzles and the spatial structure parameters make up the hydraulic structure of a dental roller drill bit.

2.The role of the hydraulic structure of the single roller cone bit.

(1). The channel through which the drilling fluid flows out of the bit and shoots to the bottom of the well.

(2).The number and size of the nozzles determine the overflow area of the bit. By adjusting the overflow area, the pressure drop of the bit is changed to achieve optimum drilling of the hydraulic parameters.

(3).By reasonably adjusting the spatial position of the nozzles, an optimal hydraulic structure is formed to effectively clean the toothed wheel and the rock dust at the bottom of the well.

Nowadays, the degree of automatic production of a single roller cone bit is very high and gradually approaches the international unified standard. Our company Hejian Hengji Bit Manufacture Co., Ltd. provides the production and development of single roller cone bit during the production of products. It is a suitable choice to select the high-quality products produced by our company.


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Hejian Hengji Bit Manufacture Co.,LTD  is specialized in researching and production of rock drilling bits since 2012, mainly includes tricone bits, PDC bits, HDD hole opener, foundation single roller cutters, drag bits and related tools with advanced CNC machines and R&D team.

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