CN218935192U

CN218935192U - Differential device and self-propelled roller press with such a device

Info

Publication number: CN218935192U
Application number: CN202190000361.XU
Authority: CN
Inventors: 雷米·鲁斯洛; 塞德里克·阿德里安森斯
Original assignee: French Redict
Current assignee: French Redict
Priority date: 2020-03-17
Filing date: 2021-03-04
Publication date: 2023-04-28
Anticipated expiration: 2031-03-04
Also published as: WO2021186118A1; FR3108375A1; DE212021000338U1; FR3108375B1

Abstract

A differential device (1) and a self-propelled roller machine (15) are disclosed, which can be interposed between a coaxial axle of the roller machine and an engine, and which comprises a pinion (2), two clutch mechanisms and a housing (6) which at least partially accommodates the clutch mechanisms and defines a through passage (7) for receiving the axle, each clutch mechanism comprising a first rotary clutch element (4) and a second rotary clutch element (5) mounted so as to be rotatable about an axis coinciding with the longitudinal axis of the through passage (7). The housing (6) in the form of a box (8) comprises a body (9) and a cover (10) each provided with a through opening (91, 101), the pinion (2) being carried by the body (9), the body comprising a bottom (92) provided with the through opening (91) of said body (9) and a peripheral side wall (93), the pinion (2) or ring gear made integrally with the body (9) extending at least partially around the peripheral side wall (93) of the body (9).

Description

Differential device and self-propelled roller press with such a device

Technical Field

The present disclosure relates to a differential device and a self-propelled machine, such as a snowplow or a lawn mower, equipped with such a differential device.

Background

The present disclosure relates in particular to such differential devices: the differential device may be interposed between a coaxial axle of a self-propelled roller press and an engine, the device comprising a pinion, two clutch mechanisms and a housing at least partially housing the clutch mechanisms and defining a through passage for receiving the axle having a longitudinal axis, each clutch mechanism comprising a first rotary clutch element and a second rotary clutch element mounted for rotation about an axis coincident with the longitudinal axis of the through passage.

Such a differential allows the axles to rotate at different speeds, which means that the risk of slipping of the machine, especially when cornering, is reduced. Heretofore, the assembly operation of such a differential device has been troublesome, and it has been considered that the mechanical strength of such a differential device is insufficient. Furthermore, as shown in patent FR 769 239, the known differential device is relatively heavy, costly and complex to manufacture.

It is an object of the present disclosure to propose a differential device which is designed not only to simplify the assembly but also to increase the mechanical strength of the differential device.

Disclosure of Invention

The present disclosure thus relates to a differential device which can be interposed between a coaxial axle of a self-propelled roller machine and an engine, said device comprising a pinion, two clutch mechanisms and a housing which at least partially accommodates the clutch mechanisms and defines a through passage for receiving the axle having a longitudinal axis, each clutch mechanism comprising a first rotary clutch element and a second rotary clutch element which are mounted so as to be rotatable about an axis coinciding with the longitudinal axis of the through passage, characterized in that the housing takes the form of a box made of synthetic material, wherein the housing comprises a body and a cover, wherein the body and the cover are each provided with a through opening so as to define the through passage, wherein the pinion is carried by the body, and wherein the body comprises an integrally made bottom and a peripheral side wall, the bottom being provided with the through opening of the body, the pinion integrally made with the body extending at least partially around the peripheral side wall of the body. Manufacturing the housing in the form of a box with a universal body made of synthetic material allows for simplified assembly. In practice, it is sufficient to place the components of the differential device inside the body of the case before the case is closed by a single piece formed by the cover of the case. As a result, the cartridge is easier to close, provides a tighter seal, and has increased mechanical strength. Finally, cartridges made of synthetic materials offer a number of possibilities in closing the cartridge by gluing, welding, screwing, etc.

According to one embodiment of the present disclosure, the cassette has a plane of symmetry coinciding with the median circumferential plane (median circumferential plane) of the pinion. This design simplifies the assembly of the differential on the shaft.

According to one embodiment of the present disclosure, the clutch mechanism is arranged on both sides of said median circumferential plane of the pinion. Again, this arrangement simplifies the operation of assembling the differential on the shaft.

According to one embodiment of the present disclosure, the second rotary clutch element of each clutch mechanism may be coupled with the pinion gear for rotation, the second rotary clutch element being mounted to be axially movable between a coupled position close to the first rotary clutch element associated with the second rotary clutch element and a decoupled position decoupled from the first rotary clutch element associated with the second rotary clutch element, the second rotary clutch element being returned to the coupled position, and the second rotary clutch elements being arranged between the first rotary clutch elements and being angularly offset from each other for displacement from one position to the other. Thus, when the second rotating clutch elements are angularly offset from each other due to the speed difference between the wheels of the machine when turning, said second rotating clutch elements have the possibility to move axially towards each other. Movement of the second rotating clutch elements toward each other disengages corresponding wheels of the machine. Such a design contributes to a simple and automatic reduction of the turning radius of a self-propelled roller press equipped with such a differential device, so that sharp turns can be made.

According to one embodiment of the present disclosure, the body and lid of the cartridge are screwed together.

According to one embodiment of the present disclosure, the pinion has circular teeth and the circular teeth are coaxial with the through passage of the housing.

The present disclosure also relates to a self-propelled roller press comprising a coaxial axle, an engine and a differential device, which differential device can be interposed between the coaxial axle and the engine of said self-propelled roller press, characterized in that the differential device is a differential device according to the above.

According to one embodiment of the present disclosure, the first rotary clutch element of each clutch mechanism is mounted in an integrally rotatable manner on an axle carrying the first rotary clutch element, and the second rotary clutch element of each clutch mechanism is mounted to rotate freely relative to the axle carrying the second rotary clutch element, wherein the second rotary clutch element may be coupled for rotation with a pinion gear.

Drawings

The disclosure will be clearly understood by reading the following description of embodiments and by referring to the accompanying drawings in which:

figure 1 shows a perspective view of a machine equipped with a differential device according to the present disclosure,

figure 2 shows an exploded view of the components of the differential device according to the present disclosure,

figure 3 shows a cross-sectional view of a differential device according to the present disclosure,

figure 4 shows a perspective view of the main body of the case of the differential device according to the present disclosure,

fig. 5 shows another perspective view of the body of the case of the differential device according to the present disclosure.

Detailed Description

Referring to the drawings and as described above, the present disclosure relates to a differential device of a motorized roller press 15.

In the example shown in the figures, the machine is a walk-behind machine. As a variant, the machine may be a sitting machine.

Advantageously, the machine 15 is a self-propelled hand-held rolling snowplow. Snowploughs are provided with steering devices, such as handles and/or grips, which allow the rider to apply torque to the machine to turn the machine in one direction or the other in order to turn left or right.

The machine 15 also comprises two coaxial axles 13, which two coaxial axles 13 are separated from each other and which two coaxial axles 13 are free to rotate relative to each other when the machine turns (as described in more detail below). Each axle 13 carries one transverse wheel of the machine.

As will be described in detail below, thanks to the differential device 1 according to the present disclosure, equipped on the machine 15, the driver can, in particular, pivot said machine about an axis perpendicular to the ground and between the transverse wheels of the machine, so as to turn the machine itself and make sharp turns.

The differential 1 comprises a pinion 2, which pinion 2 can rotate about the axis of the pinion 2 under the action of the engine 14 of the machine 15 via a transmission system interposed between the pinion 2 or toothed ring gear and the engine 14. Thus, the pinion gear 2 has circular external teeth 21.

The differential device 1 includes two clutch mechanisms 3.

The differential device 1 comprises a housing 6, the housing 6 at least partially accommodating the clutch mechanism 3 and defining an elongated through passage 7 having a longitudinal axis for receiving an axle 13. The housing 6 takes the form of a box 8 comprising a main body 9 and a cover 10. In order to define the through passage 7, the main body 9 and the cover 10 are each provided with a first through opening denoted by reference numeral 91 and a second through opening denoted by reference numeral 101 in the figures. Pinion 2 is carried by body 9. It should be noted that in this context, the term "pinion" should be considered equivalent to "toothed ring gear". The main body 9 includes a bottom 92 provided with a first through opening 91 of the main body 9 and a peripheral side wall 93 surrounding the bottom 92. The bottom 92 and the peripheral side wall 93 are integrally formed. Pinion 2, which is made integral with said body 9, extends at least partially around a peripheral side wall 93 of body 9.

In the example shown, the box 8 is made of synthetic material and has a symmetry plane P coinciding with the median circumferential plane P of the pinion 2. The circular teeth 21 of the pinion 2 are coaxial with the through passage 7 of the housing 6. The body 9 and the cover 10 of the case 8 are screwed together by means of screws 12. The clutch mechanism 3 is arranged in the housing 8 on both sides of the median circumferential plane P of the pinion 2.

Each clutch mechanism 3 comprises a first rotary clutch element 4 and a second rotary clutch element 5, which first rotary clutch element 4 and second rotary clutch element 5 are mounted rotatable about an axis coinciding with the longitudinal axis XX' of the through channel 7. The first rotating clutch element 4 of each clutch mechanism 3 is mounted in an integrally rotating manner on an axle 13 carrying the first rotating clutch element 4. The second rotating clutch element 5 of each clutch mechanism 3 may be coupled for rotation with the pinion gear 2 and the second rotating clutch element 5 is mounted for free rotation relative to the axle 13 carrying the second rotating clutch element 5.

The second rotating clutch element 5 is positioned between the first rotating clutch elements 4. The differential device 1 further comprises return means for returning the second rotating clutch element 5 towards the corresponding first rotating clutch element 4. Advantageously, said return means are formed by springs 11 interposed between the second rotating clutch elements 5.

In the following description and with reference to the specific embodiments shown in the drawings, the first rotary clutch element 4 is formed by a hub called clutch hub and the second rotary clutch element 5 is formed by clutch plates. Of course, the first and second rotary clutch elements may be manufactured in other forms, which means that the following description applies to other designs of the first and second rotary clutch elements.

The clutch hub 4, clutch plates and pinion 2 or toothed ring gear are sandwiched between the bottom 92 of the case 8 and the cover 10 and are traversed by the axle 13. The device 1 further comprises a set of sealing rings, seals and gaskets.

Each of the clutch hubs is mounted in an integral rotary manner on one of the axles, preferably by means of complementarily shaped splines provided on the respective axle and on the inner edge of the clutch hub.

For each clutch mechanism 3, the clutch plates and the clutch hub are provided with clutch means coupled to each other. The clutch device may be a dog clutch or a friction clutch device.

In the example shown in the figures, the clutch means is formed by teeth 53 provided on one face of each plate (clutch plate). These teeth 53 have opposite inclined sides which can form cams or inclined planes of the mating teeth 41 provided on the hub face facing the clutch plate. The flanks of the teeth are preferably inclined 45 ° relative to a plane transverse to the axis of the respective clutch hub or clutch plate.

The clutch plate is axially movable between a position close to the clutch hub (coupled to the clutch hub) and a position separated from the clutch hub 3 (decoupled from the clutch hub 3). In the closed position, the hub and the blade are pressed against each other such that the teeth of the hub and the blade interlock with each other. The hub and the blade then rotate at the same speed. In the disengaged position, the teeth of the hub and the blade are disengaged from each other such that the hub and the blade can rotate at different speeds.

As described above, the pinion 2 and the clutch plate are provided with means for rotationally coupling the pinion 2 and the clutch plate together. The rotational coupling means allow the rotational force of the pinion 2 to be transferred to the clutch plates when the clutch plates are driven by the pinion 2. When the clutch plate tends to rotate faster than the pinion 2 or in the opposite direction to the pinion 2, the pinion 2 is braked against the clutch plate by means of the coupling means.

The clutch device between the pinion 2 and the clutch plates includes internal teeth 931 provided on the inner periphery of the pinion 2 and external teeth 51 provided on the outer periphery of each clutch plate. Each pair of internal teeth of the pinion 2 defines a recess for receiving a tooth of each clutch plate. The width of each tooth and the width of the recess defined between each pair of teeth (which width is considered to be the width in a direction parallel to the axis of the toothed ring gear) are designed to allow the pairs of teeth of the pinion 2 to receive the teeth of two clutch plates, in particular when the two clutch plates are opposite one another.

Each clutch plate is further provided with a bearing contact means in bearing contact with the other clutch plate. The bearing contact means allow the clutch plates to interact with each other to adjust the axial position of the clutch plates in accordance with the rotational speed difference of the axle in the figures.

The bearing contact means of each clutch plate includes teeth 52 oriented toward the other clutch plate. In the example shown in the figures, the teeth 52 of each clutch plate are integral one piece with the teeth of the clutch plate, which teeth are part of the coupling means between the pinion 2 and the clutch plate.

When the axle rotates at the same speed, the clutch plates are in a first angular configuration. In the first angular configuration of the clutch plates, the teeth of the clutch plates face each other and are in bearing contact with the teeth of the other clutch plate via the tips of the teeth, thereby preventing the clutch plates from moving axially toward each other.

The teeth each include two opposite sloped sides forming a ramp. The tooth top of each tooth is flat so as to allow the tooth to bear in a stable manner on the flat tooth top of the corresponding tooth of the other clutch plate when the clutch plates are in said first angular position.

When the wheel shafts 13 are rotated at different speeds relative to each other, the clutch plates become angularly offset from each other. The clutch plates are then in a second angular configuration that is different from the first configuration. In the second angular configuration, the teeth of one clutch plate are angularly offset from the teeth of the other clutch plate, allowing the clutch plates to move axially toward each other. The clutch plates can then be disengaged from the corresponding hubs if the speed of the corresponding wheels of the machine is different from the speed of the pinion 2.

In particular, in said second configuration of clutch plates in which the teeth of one clutch plate are angularly offset from the teeth of the other clutch plate, the teeth of these clutch plates face each other via one of the inclined surfaces of the teeth of the clutch plates. The ramps can be brought into bearing contact with one another in accordance with the relative speed of the clutch plates as the clutch plates are shifted from the second angular configuration to the first angular configuration. Thus, since the flanks of the teeth of one clutch plate bear on the corresponding flanks of the teeth of the other clutch plate, in combination with the return force of the return means, the clutch plates can be moved axially away from each other until the teeth face each other and the teeth bear in contact via the tips of the teeth.

Thus, when one of the two shafts tends to rotate at a speed different from the speed of the pinion 2 and from the other shaft, and when the corresponding clutch plate is engaged with the pinion 2, the clutch plate is angularly offset from the other clutch plate, and the plate is pushed axially by the play (play) of the clutch means between the hub and the plate to move away from the hub, so that the corresponding wheel coupled with the hub via the corresponding shaft is disengaged.

According to a variant of the present disclosure, not shown in the figures, the clutch means between the clutch plates and the corresponding clutch hub may be formed by a male friction cone and a female friction cone.

The operation of the machine equipped with the differential device 1 according to the present disclosure is as follows:

when the wheel axle is driven by the pinion 2 or toothed ring gear and rotates at the same speed, which corresponds to the self-propelled machine following a straight path (forward or reverse travel), the return means return the blades to the position in which they are coupled to the hub. Since the teeth of the plates in the figures are axially opposite at the flat top of the teeth, the plates remain pressed against each other against the respective hubs.

When the driver begins to turn by turning the handle, the outside wheels turn faster than the inside wheels, thereby angularly offsetting the sheets relative to each other.

The tips of the peaks of the supporting contact teeth of the plates are no longer opposite each other, and therefore the plates can be moved axially translationally towards each other so as to allow the disengagement of the corresponding wheels.

The device according to the present disclosure operates in the same manner when turning in reverse travel and when turning in forward travel. The clutch elements of the device are identical on both sides of the pinion, which means that the clutch elements of the device as a whole have a plane of symmetry passing through the median plane of the pinion.

Claims

1. Differential device (1) which can be interposed between a coaxial axle (13) of a self-propelled roller press (15) and an engine (14), the differential device (1) comprising a pinion (2), two clutch mechanisms (3) and a housing (6), the housing (6) at least partially housing the clutch mechanisms (3) and defining a through channel (7) with a longitudinal axis for receiving the axle (13), each clutch mechanism (3) comprising a first rotary clutch element (4) and a second rotary clutch element (5), the first rotary clutch element (4) and the second rotary clutch element (5) being mounted so as to be rotatable about an axis coinciding with the longitudinal axis of the through channel (7), characterized in that the housing (6) takes the form of a box (8) made of synthetic material, the housing (6) comprising a main body (9) and a cover (10), wherein the main body (9) and the cover (10) are each provided with a first through opening (91) and a second rotary clutch element (5), wherein the main body (9) is formed as one piece with a side wall (92) and wherein the main body (9) is formed with a side wall (93), the bottom (92) is provided with the first through opening (91) of the main body (9), and the pinion (2) integrally made with the main body (9) extends at least partially around the peripheral side wall (93) of the main body (9).

2. Differential device (1) according to claim 1, characterized in that the box (8) has a symmetry plane (P) coinciding with the median circumferential plane (P1) of the pinion (2).

3. Differential device (1) according to claim 2, characterized in that the clutch mechanism (3) is arranged on both sides of the median circumferential plane (P1) of the pinion (2).

4. A differential device (1) according to any one of claims 1-3, characterized in that the second rotating clutch element (5) of each clutch mechanism (3) is coupleable with the pinion (2) for rotation, wherein the second rotating clutch element (5) is mounted axially movable between a coupled position close to the first rotating clutch element (4) associated with the second rotating clutch element (5) and a decoupled position decoupled from the first rotating clutch element (4), wherein the second rotating clutch element (5) is returned to the coupled position, and wherein the second rotating clutch element (5) is arranged between the first rotating clutch elements (4) and angularly offset from each other for displacement from one position to the other.

5. A differential device (1) according to any one of claims 1 to 3, characterized in that the body (9) of the case (8) and the cover (10) are screwed together.

6. A differential device (1) according to any one of claims 1 to 3, wherein the pinion (2) has circular teeth (21), and wherein the circular teeth (21) are coaxial with the through channel (7) of the housing (6).

7. A self-propelled roller machine (15), the self-propelled roller machine (15) comprising a coaxial axle (13), an engine (14) and a differential device (1), the differential device (1) being insertable between the coaxial axle of the self-propelled roller machine (15) and the engine (14), characterized in that the differential device (1) is a differential device according to one of claims 1 to 6.

8. Self-propelled roller press (15) according to claim 7, characterized in that the first rotary clutch element (4) of each clutch mechanism (3) is mounted in an integrally rotating manner on the axle (13) carrying the first rotary clutch element (4), and in that the second rotary clutch element (5) of each clutch mechanism is mounted free to rotate relative to the axle (13) carrying the second rotary clutch element (5), wherein the second rotary clutch element (5) is coupleable with the pinion (2) for rotation.