神马文学网Fishing Reel Gear Ratio. What's That?
来源：百度文库 编辑：神马文学网 时间：2024/04/29 15:32:23
High Gear Ratios? Think Speed
Low Gear Ratios? Think Power
When anglers talk about fishing reel gear ratio in relation to a reel's speed or even its power, they often forget to include the reel's spool size in the equation. A reel's spool works in compliment to its gears. The gears and spool "together" determine the reel's true speed and power. But before we get into all that let's take a quick look at the fundamentals of gears. Don't worry, I'll keep it short and in language guys like you and I can understand. You know, non-engineer types.
To Understand Fishing Reel Gear Ratio You Gotta Understand Gears
Certainly you all know what gears are and what they do. But in the interest of being thorough I offer this brief explanation. However, I also offer this disclaimer. I am not a mechanical engineer. As a matter of fact, when something breaks around our house the wife fixes it. I'm just a retired old salesman and avid bass fisherman. So here we go. Hope for the best.
Gears are wheels, or discs, with teeth extending "radially" from their outer circumference. Most of us think of gears as the traditional spur gear, the classic cog-shaped gear with simple straight teeth like that in the picture right.Some of us may also understand that "helical" gears have teeth that, while protruding from the gear radially, do so diagonally across the outside edge of the gear, rather than perpendicular to it. Helical gears tend to be quieter, smoother operating and longer lasting than spur gears. This is due to their broader distribution of force or load along the teeth.
The complex shape of helical gears makes them more expensive than spur gears and are found in the more expensive reels. Well worth the money I say. Helical gears, when used on parallel shafts, operate just like spur gears, but offer smoother operation. They can also operate well at an angle.
Gears are positioned in relation to one another so their teeth mesh together. Torque, a turning/twisting force, is applied to one gear, the driver", causing it to turn. It in turn transfers motion to the other gear, the "driven" gear. The driven gear turns in the "opposite" direction of the "driver" gear.Gears can be used to increase (gear up) or decrease (gear down) the speed, increase or decrease the power (torque) or change the direction of a driven unit.
There you have it. That's the best I can do fellas.
Now, what Does This Gear Stuff Mean To You and Your Reels?
First, a functional characteristic of gears that is important for bass fishermen to understand, in relation to fishing reel gear ratio and how it relates to their reel's performance, is that you can not increase speed or power without reducing the other. Gearing up, that is, increasing the number of complete revolutions (speed) of the spool per crank of the handle, will decrease its power and vice-versa. Reducing the number of revolutions increases power but reduces speed. This is where fishing reel gear ratio comes in. Low gear ratio equals power, high gear ratio means speed. Think, race cars go fast but can't pull any weight while big trucks can pull heavy loads but can only move slowly.
So the function of gears, and we're talking here about gears in fishing reels, is to produce either power or speed in the spool. In fishing reels there are two "primary" gears. The larger of the two is the "driver" or "input" gear. It can appropriately be called a wheel, even a disc, as illustrated in the picture right. 
The other gear, the "output" gear, is much smaller. It's known as the "driven" gear. That is, the gear that is turned (driven) by the rotational force of the larger gear. These are identified as the main and pinion gears respectively. 
Both the main drive and pinion gears are spur gears, the most simple of gear types. These gears are positioned on parallel axles in the same plane so their teeth mesh. This is clearly illustrated in the photo above. When the angler turns the reel's handle, which is directly linked to the main "drive" gear, it acts directly on the "main drive gear" turning it.
GEARS and GEAR RATIOS
You have no doubt seen the many different gear ratios on both baitcasting and spinning reels. There are gear ratios of 6.3:1, 7.1:1, 5.3:1, 5.4:1, 6.4:1, 5.0:1, 5.2:1, 6.0:1 and even 4.7:1, though this is by no means a complete list. So upon what are these numbers based?
The numerical "gear ratio" of any fishing reel is determined by the number of teeth on each gear. Take the number of teeth on the larger drive gear and divide it by the number of teeth on the smaller pinion gear and you get that reel's gear ratio. For example, a 72 tooth main gear and a 12 tooth pinion gear produces a 6:1 ratio. This reads as a "six to one" ratio.
Functionally, this means that when the larger drive gear, which is linked directly to the reel handle, is turned one full revolution by the handle, the smaller pinion gear, which connects to the spool, turns six revolutions causing the spool to do the same.
Note that the first number of a fishing reel gear ratio relates to the smaller "pinion gear" or driven gear. The higher that number the faster the spool retrieves line. If the number is low the spool turns slower and the rate of line recovery is less.