Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H29/00—Gearings for conveying rotary motion with intermittently-driving members, e.g. with freewheel action
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H31/00—Other gearings with freewheeling members or other intermittently driving members
  • F16H31/001—Mechanisms with freewheeling members

Definitions

• This invention relates to a rotation reversing gear mecha- nism, which alternatively can be utilised for constantly rotating motors or for reciprocating motors, such as a reciprocating pneumatic or hydraulic piston/cylinder motor or a so called pendulum piston motor, e.g. of the type shown in the patent GB 2 312 248 or in WO 99/27597, or our Swedish patent application 9900313-9, where the driving force changes direction for every movement of slightly less than 360°, but where a direction of rotation in one direction only is desired on the output shaft.
• a rotation reversing gear mecha- nism which alternatively can be utilised for constantly rotating motors or for reciprocating motors, such as a reciprocating pneumatic or hydraulic piston/cylinder motor or a so called pendulum piston motor, e.g. of the type shown in the patent GB 2 312 248 or in WO 99/27597, or our Swedish patent application 9900313-9, where the driving force changes direction for every movement of slightly less than 360°, but where
• the two last mentioned or proposed arrangements may comprise a hydraulically or pneumatically influenced pendulum piston motor or annular piston motor consisting of a cylinder housing and a toroid shaped cylinder bore, in which a pendulum piston means is pivotable in two opposite direc- tions over an angle of up to approx. 350-356°, and where the cylinder bore at one location is divided by a piston chamber wall, and where the pendulum piston means is associated with a flywheel mass, which is connected to a central output shaft .
• the invention is applicable to motors having constant rotation in one direction only to effect a reversal of the rotation direction of the output shaft, or applicable to motors of pendulum piston type as disclosed and described in the two last mentioned publications, said motors being designed in such a manner, that the output shaft always rotates in one direction only although the pendulum has a reciprocating sequence of operation.
• this is achieved in such a manner, that between the output shaft and the drive centre in the gear mechanism there are two sets each of which including two freewheels, one of the freewheels for driving clockwise and the other for driving anticlockwise.
• the output shaft has a displaceable sleeve, which is displaceable to a limited extent on a part of the output shaft, and which can occupy two different end positions (c.f. figure 1 and 2, respectively), which are defined by two slots, through which radial pins are extend- ing, and these pins in co-operation with the slots provide a drive force transmission between the sleeve and the output shaft .
• FIG. 1 shows a rotation reverser in accordance with the invention, which is applied in a motor of constantly rotation type, in a position for rotation in a first direction
• figure 2 shows the same rotation reverser for rotating the output shaft in a direction opposite to the first direction
• Figure 3 shows the rotation reverser of figure 1 being installed as a drive centre in a pendulum piston motor
• Figures 4, 5 and 6 show a somewhat modified type of rotation reverser, which is designed for driving in a first direction, e.g. clockwise as shown in figure 4, and also provided with a neutral function position, as shown in figure 5, as well as for driving in a direction opposite to the first direction, e.g. anticlockwise as shown in figure 6.
• Figures 1 and 2 show a gear mechanism with an input shaft 1, which constantly rotates in a certain direction, clockwise in the illustrated case, and which is intended for driving an output shaft 2 by way of a differential gear mechanism 3 having input bevel gears 4, against one of which the input shaft 1 is connected in a non rotary fashion, and output bevel gears 5, which are provided to transmit a torque force from the input shaft 1 to the output shaft 2.
• the gear mechanism is provided with one set of two freewheels 6, 7 and 6a, 7a respectively, e.g. of so called INA type, where one of the freewheels is arranged for driving in a certain direction, e.g. in anticlockwise direction, and the other freewheel is arranged for driving in clockwise direction. From a driving point of view the freewheels are arranged as +/- and -/+ respectively.
• the freewheels 6, 7 and 6a, 7a, respectively, are installed in such a manner, that one of the freewheels in each pair of freewheels co-operates, in that one of the freewheels 6, 7a is a clockwise freewheel and the other freewheel 6a, 7 is a anticlockwise freewheel, this accordingly being the requirement of driving the output shaft constantly in one direction only, forwards or backwards respectively.
• a sleeve 8 which is displaceable on a diametrically reduced part 9 of the output shaft 2, and which is provided with one or preferably two axial slots 10, through which extends a fixed pin 11, which is secured to the output shaft 2.
• the pin 11 forms a rotational connection between the output shaft 2 and the sleeve 8.
• the freewheels 6-7 and 6a-7a are designed for opposite driving directions, and the pair of freewheels in the two sets of freewheels are mutually opposite, i.e. the freewheel 6 of one set is driving at the same time as the free- wheel 6a of the other set is running freely, imposing clockwise drive direction on the output shaft 2, as shown in figure 1, whereas the freewheel 7a is driving and the freewheel 7 is running in free position in the axially displaced position of the sleeve 8 with the catch surfaces 12, imposing a reversed drive direction on the output shaft 2 which accordingly rotates in anticlockwise direction, as shown in figure 2.
• One of the directions is designated forwards and the other direction backwards.
• FIG. 1 there is shown how the input shaft 1 rotates an input bevel gear 4 , which causes a corresponding drive of the remaining bevel gears 4 and 5 in the differential gear mechanism.
• the catch surface 12 one of the freewheels 6 transfers the driving movement forwards from the output gear 5 to the sleeve 8, which in turn transfers the rotational movement forwards to the output shaft 2.
• the other catch surface 12a co-operates simultaneously with the freewheel 6a of the other freewheel set, which freewheel runs freely in this position.
• the sleeve 8 is pulled out in such a manner that the catch surfaces 12 and 12a engage the freewheels 7 and 7a.
• the freewheel 7 runs freely, whereas the freewheel 7a is driving, in this case in a direction opposite to the direction mentioned above, thus in anticlockwise direction as shown in figure 2, thus in the backward direction.
• FIG 3 there is shown a pendulum piston motor of a type known per se, in which a piston 13, which is recipro- catingly pivotable in a toroid shaped working chamber 14, and which is fastened in a part 15 of a rotation centre 16 designed essentially as a differential with four cooperating bevel gears, in the case shown two pairs of cooperating gears 4 and 5.
• a rotation centre 16 designed essentially as a differential with four cooperating bevel gears, in the case shown two pairs of cooperating gears 4 and 5.
• the motor is - in the same manner as described above with reference to figures 1 and 2 - provided with two pairs of freewheels 6, 7 and 6a, 7a respectively, e.g.
• the pendulum piston motor functions as follows
• the pendulum piston 13 performs a reciprocating movement in the working chamber.
• the freewheel 6, which co-operates with a first catch surface 12 causes a driving in a certain direction, e.g. forwards
• the other freewheel 6a which co-operates with the other catch surface 12a
• the pendulum piston reverses direction after almost 360° rotation
• the freewheel 6a of the other set of freewheels will engage and continue the rotation of the output shaft 2 in the same direction as before, that is to say forwards, whereas the freewheel 6 is running freely. In this manner the output shaft 2 will be driven constantly forwards.
• Reversal from the forward direction to the backward direction and vice versa is effected very simply by pulling out the sleeve 8 to its outer end position, which is defined by the ends of the slots 10, or by pushing it in to its inner end position, respectively, which also is defined by the ends of the slots 10.
• the gear mechanism has a neutral position, in which the motor with the input shaft 1 can rotate freely without driving the output shaft 2.
• a neutral position sleeve 17 and 17a respectively, which is slightly longer than the catch surfaces 12, 12a.
• the sleeve 8 is shown in a fully inserted position corresponding to driving forwards
• the sleeve is shown in an intermediate position corresponding to the neutral position sleeve 17, 17a, whereby the output shaft 2 is fully disconnected and the input shaft can rotate freely in either direction.
• Figure 6 shows the sleeve 8 in a fully extended position, whereby the rotational movement from the input shaft 1 is transmitted to a rotation backwards of the output shaft 2.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Transmission Devices (AREA)
• Retarders (AREA)

Priority Applications (1)

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Publications (1)

Family

ID=20416635

Family Applications (1)

Country Status (3)

Cited By (1)

Citations (4)

• 1999
  • 1999-08-09 SE SE9902861A patent/SE9902861L/sv unknown
• 2000
  • 2000-08-02 AU AU64860/00A patent/AU6486000A/en not_active Abandoned
  • 2000-08-02 WO PCT/SE2000/001536 patent/WO2001011265A1/en active Application Filing

Patent Citations (4)

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