Constructing method for ramp surface of pulley assembly , pulley and pressure plate having variable-curvature ramp

Abstract

A method for designing the surface trajectory of a pulley assembly is disclosed, used to construct the contact surface distribution between the internal surface of a pulley assembly and a pulley bead. The internal surface of the pulley assembly contains a plurality of independently defined surface trajectories. The design method includes the following steps: establishing a transient dynamic balance function model of a vehicle corresponding to the total on-wheel drive thrust function required by a vehicle; defining a theoretical pulley variable thrust function; and establishing function models corresponding to the total on-wheel drive thrust function required by the vehicle and the theoretical pulley variable thrust function. In the function models generated by the aforementioned method, the influence of changes in the target pulley thrust function on the total on-wheel drive thrust function required by the vehicle can be defined, and the obtained bead inclination angle can be converted into a specific geometric curve.

Claims

1. A method for designing the surface trajectory of a torpedo block assembly, used to construct the surface distribution of the contact surface between the internal surface of a torpedo block assembly and a torpedo bead, wherein the internal surface of the torpedo block assembly contains a plurality of interconnected surface trajectories, and at least two of the surface trajectories are defined independently of each other. The design method includes the following steps: establishing a transient dynamic balance function model of a vehicle corresponding to the total wheel drive thrust function required by a vehicle, wherein the total wheel drive thrust function required by the vehicle is obtained based on actual measurements and corresponds to the required wheel thrust under a plurality of speed ranges; defining a theoretical torpedo block variable thrust function, satisfying the relationship, Fv(θ, ω)= Fa⊥ + Fb⊥, where, Fv(θ, ω) is the theoretical pulley variable thrust function, Fa⊥ is the vertical component of the contact force between the pulley ball and the pulley track surface, and Fb⊥ is the vertical component of the contact force between the pulley ball and the pressure plate contact surface. Furthermore, a functional model is established that corresponds to the total wheel drive thrust function required by the vehicle and the theoretical pulley variable thrust function, satisfying the relationship Fd(v) ≈ Ft(θ, ω) * R(v), where Fd(v) is the total wheel drive thrust function required by the vehicle, Ft(θ, ω) is the target pulley thrust function corresponding to the theoretical pulley variable thrust function, and R(v) is a sensitivity ratio function to reflect the impact of changes in the target pulley thrust function on the total wheel drive thrust function required by the vehicle.

2. The design method for the surface trajectory of the pulley group as described in claim 1, wherein the vehicle transient dynamic balance function model includes the following relationship: Fd(v) = Fw(v) + Fr(v) + Fm(v) where, Fd(v) is the total driving thrust function required by the vehicle at the wheels during transient dynamic balance, Fw(v) is the wind resistance function, Fr(v) is the wheel resistance function, and Fm(v) is other friction and loss functions.

3. The method for designing the surface trajectory of the Pullman array as described in claim 1, wherein, The total drive thrust function required by the vehicle at the wheels is obtained based on a measurement of a set parameter, which is selected from at least one of the reduction ratio, vehicle speed, acceleration, and engine angular velocity.

4. The method for designing the surface trajectory of the Pullman array as described in claim 1, wherein, The total on-wheel drive thrust function required by the vehicle and the theoretical pulley transmission thrust function satisfy the following relationship: Ft(θ, ω) = Ke * Fv(θ, ω), where Ke is a correction coefficient used to reflect the variation between the target pulley thrust function and the theoretical value of the theoretical pulley transmission thrust function.

5. The method for designing the surface trajectory of the Pullman array as described in claim 4, wherein, The correction factor includes a constant, a vehicle speed function, a rotational speed function, or a relationship formed by a combination of the above values ​​or functions.

6. The method for designing the surface trajectory of the Pullman array as described in claim 1, wherein, The sensitivity ratio function was obtained by fitting multiple sets of measured samples using the least squares method. The measured parameters included reduction ratio, speed and / or vehicle speed.

7. The method for designing the surface trajectory of the Pullman array as described in claim 1, wherein, The sensitivity ratio function is constructed to make the target thrust function of the pulley match the total on-wheel drive thrust function required by the vehicle.

8. A pudding disc, comprising a pudding disc bead track for accommodating a pudding bead; wherein, The pulley track constructs a plurality of track tracks that are interconnected, and at least two of the track tracks are defined independently and differently from each other. The distance between each track track and the bottom of the pulley track is different and corresponds to different speed ranges of a vehicle. These track tracks are defined by the design method of the pulley track surface track described in any one of claims 1 to 7.

9. The plural as described in claim 8, wherein, The plurality of bead tracks are selected from at least one or more combinations of straight lines, arcs with concave surfaces facing the opening of the plein plate bead track, arcs with convex surfaces facing the opening of the plein plate bead track, variable curvature curves, S-curves, and free curves.

10. A pressure plate for use in a pulverizer, the pulverizer including a pulverizer bead track for receiving a pulverizer bead; wherein, The pressure plate has a pressure plate contact surface for contacting the surface of the pulley bead. The pressure plate contact surface constructs a plurality of pressure plate tracks that are interconnected, and at least two of the pressure plate tracks are defined independently and differently from each other. Each pressure plate track is at a different distance from the rotation axis of the pressure plate and corresponds to a different speed range of a vehicle. These pressure plate tracks are defined by the design method of the pulley bead assembly surface track described in any one of claims 1 to 7.

11. The pressure plate as described in claim 10, wherein, The plurality of pressure plate trajectories are selected from at least one or more combinations of straight lines, concave arcs facing the Phillips bead path, convex arcs facing the Phillips bead path, variable curvature curves, S-curves, and free curves.

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