SU1536102A1 - Lubricated worm gearing - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in power drives with worm gears. The aim of the invention is to increase the carrying capacity and transmission efficiency by creating a guaranteed lubricating gap between the active surfaces of the screw and the wheel. In the worm gear, the cylindrical worm to 1, the axial profile of the turns of which is located outside the dividing cylinder of radius R ₁ , meshes with the worm gear 2. The axial profile of the turn of the worm 1 consists of a straight line section and a smoothly coupled section of the turn head made along the arc of a circle. When applying forced lubrication to the contact zone, the point of supply of forced lubricant on the active tooth surface of wheel 2 is aligned with the compression point of cavity 3 with lubricant and is the exit point of the axis of the channel 8 to the active tooth surface. The compression point of the cavity 3 with lubricant (in the absence of lubricant supply) is shifted towards the exit of the turn of the screw 1 from engagement relative to the middle face plane of the wheel by the value L calculated by the formula given in the text of the invention. 3 il.

Description

(21) Vtl1645 / 25-28

(22) 02.29.88

(I) 01/15/90. Syul R 2

(72) S.L.Lagutin, A.V.Verhovsky

and A.I. Sandler

(53) 621.833 (088.8)

(56) Author's testimony of the USSR If, cl. F 16 and 1/16, 1968.

, (WORM TRANSFER WITH CMASKOt:

(57) The invention relates to mechanical engineering and can be used.

in power drives with worm gears. The aim of the invention is to increase the carrying capacity and gearbox / 1 transmission by creating a guaranteed lubricating gap between the active surfaces of the screw and the wheel. In the worm gear, the cylindrical worm to 1, the axial profile of the turns of which is located outside the dividing cylinder of radius R ,, is engaged with the worm gear 2. The axial profile of the turn of the screw 1 consists of a straight line section and a smoothly coupled section of the coil head made along the arc of a circle. When applying forced lubrication to the contact zone, the point of supply of forced lubricant on the active tooth surface of wheel 2 is aligned with the compression point of cavity 3 with lubricant and is the exit point of the axis of the channel 8 to the active tooth surface. The compression point of cavity 3 with lubricant (in the absence of lubricant supply) is shifted towards the exit of the turn of the screw KA.1 from engagement with respect to the middle face plane of the wheel by 1, calculated using the formula given in the text of the invention. 3 il.

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The invention relates to mechanical engineering and can be used in power screw drives.

The aim of the invention is to increase the carrying capacity and transmission efficiency by creating a guaranteed lubricating gap between the active screw surfaces of the worm and the wheel.

Figure 1 shows the axial section

worm gear without forced lubrication; Fig. 2 shows the projection of the contact lines on the side surface of the coil of the screw; Fig. 3 is an axial section of a worm gear with a forced lubricant supply.

The worm gear consists of a cylindrical worm 1, the axial profile of the turns of which is located outside the dividing cylinder of the worm 1 and the black wheel 2. The axial profile of the turn of the worm 1 consists of a straight line section of arbitrary height and a smoothly aligned section of the turn head made along the arc of a circle. The tooth of the worm gear 2, conjugated with the turns of the screw 1, forms a cavity 3 with lubricant, limited by closed contact lines,

 angle profile of the screw worm at the point of compression of the cavity with lubricant,

The projections D of which on the lateral surface-30 and located on the tooth surface of the coil of the screw 1 are shown on the scaffolding relative to the wheel axis. 2. Dimensions of cavity 3 with stand grease

Rlk aw RKcosV) z + RK - rm ctpoik + 0,5mz, v) 2,

where is the center distance of transmission;

C | arcsin 1 / Р к is the angular displacement of the point of compression of the cavity with lubrication relative to the middle face plane of the wheel. In the case of a forced supply of lubricant (Fig. 3), lubricant from oil dispensers (not shown) flows through channels 7, 8 to the active surface of the wheel tooth into cavity 3, which is compressed to the projection C, and then to point K0.

In FIG. 3, a worm gear with lubricant is shown on the example of a gear with non-smooth closed contact lines.

During operation, the turns of the screw 1 engage with the teeth of the wheel 2 and a cavity 3 is created between their active surfaces with lubricant, which is compressed to the projection k and then to point K. Wear of the teeth and turns

five

ten

15

-and

25

change in the process of engagement to the position 5, compressing to the point K. One of the intermediate positions of the lubricant 3 is characterized by an instantaneous contact line 6 (Fig. 2).

When channeling forced lubrication into the contact zone, point K of the forced lubrication supply on the active tooth surface of the wheel is combined with the compression point of cavity 3 with lubrication and is the exit point of the axis of the channel 8 to the tooth surface. Point K of compression of cavity 3 with lubricant is shifted relative to the medial end plane of wheel 2 on its tooth towards the exit of coil of screw 1 from engagement by the value

1 m z, (RK - R,) / 2R, tgrfK, where n and z4 are the modulus and

the number of entries of the screw, R is the radius of the separating cylinder of the screw, Rk is the radius of the cylinder of the screw passing through the compression point of the cavity with grease,

 angle profile of the screw worm at the point of compression of the cavity with lubricant,

30 and is located on the surface of the tooth of the wheel relative to the axis of the wheel at a distance of

minimized as a result of fluid friction. In the presence of a forced lubricant supply through channels 7 8, the transmission efficiency increases significantly.

Accurate determination of the point of compression of the cavity with lubricant allows to increase the accuracy of the calculation and thereby the loading capacity of the transmission and ensure that the channel B is forced to supply lubricant to the tooth of the wheel at the point of compression of the cavity 3.

Claims (1)

Invention Formula A worm gear with lubricant, containing a cylindrical screw to, whose axial profile is located outside the dividing cylinder of the screw and consists of a straight line section and a smoothly conjugate section of the head of the coil made along the arc of a circle, and a worm wheel, co515 screwed with a worm on a closed curve limiting the cavity for lubrication, characterized in that, in order to increase the carrying capacity and transmission efficiency, the point of compression of the lubrication cavity on each tooth of the wheel is shifted towards the exit of the coil of the worm from engagement relative to average face plane of the wheel on the value of 1 1 m-z, (RK - R,) / 2R ,. tg, where m and r are the module and the number of worm calls, respectively k2lЈ (aw - RKcosty) 2 -Where a The center distance of the arcsin 1 / R transfer is the angular displacement of the point of compression of the cavity with lubrication relative to the middle face plane of the wheel, and in the case of a forced supply one 026 R, is the radius of the dividing cylinder of the worm | R is the radius of the cylinder of the screw passing through the point of compression of the cavity with lubricant; its is the angle profile of the screw turn at the point of compression of the cavity with lubricant, and is located on the surface of the wheel tooth relative to the wheel axis at a distance: + (Rk - R,) ctgoiK + 0.5mz, (2, The lubrication channels are made in the contact zone in each tooth of the wheel and the point of compression of the lubrication cavity on each tooth is aligned with the intersection point of the channel axis in the body of this tooth with its active surface. 1 Schig.1