# US 2025/0092918 A1 · Drivetrain and constant velocity joints for recreational vehicles > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0092918 A1 - Document ID: US20250092918A1 - Status: Published application - Kind: A1 - Application number: 18/830,810 - Filed: 2024-09-11 - Published: 2025-03-20 - Earliest claimed: 2023-09-15 - Applicants: Polaris Industries Inc. - Inventors: Prasad Bhaskar Poojari; Daniel S. Weber; Marc Vanderhoof; Bryce R. Evans; Jacob Grobbel; Adam Schlangen; Steve Nelson; Michael Whiting; Ron Danielson; Brenden Bungert; Jeremy Lyons; Jacob Frank; Spencer Rosar - Web page: https://patentgrep.com/patent/US20250092918A1 ## CPC - F16D 3/2237: where the grooves are composed of radii and adjoining straight lines, i.e. undercut free [UF] type joints - F16D 3/226: the groove centre-lines in each coupling part lying on a cylinder co-axial with the respective coupling part - F16D 3/227: the joints being telescopic - F16D 2003/22309: {Details of grooves} - F16D 2003/22326: {Attachments to the outer joint member, i.e. attachments to the exterior of the outer joint member or to the shaft of the outer joint member} - Y10S 464/906: Torque transmitted via radially spaced balls - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract Drivetrains and constant velocity joints for recreational vehicles are disclosed. These joints comprise a housing, an aperture for connecting with an axle, and interior components for rotatably connecting the axle to the housing. Various retention mechanisms improve the retention of constant velocity joints, including hydraulic-based, disc-based, pin-based, spline-based, and spring ring-based mechanisms. Hydraulic-based systems utilize adjustable hydraulic pressure for maintaining engagement. Disc-based mechanisms employ a conical disc that provides additional frictional force to resist pull-out forces. Pin-based retention involves drive pads or pins and corresponding tracks or grooves in the shaft interfacing gear. Spline-based mechanisms include a toolless locking half shaft retention system with rotating, interrupted splines. Spring ring-based retention features multiple flexible retaining rings placed axially along the spline, providing improved shaft retention. These retention mechanisms enhance the performance and reliability of recreational vehicle drivetrains by securing the constant velocity joint connections. ## Claims ### Claim 1 A constant velocity joint for a recreational vehicle, the constant velocity joint comprising: a housing extending from a rearward end to a forward end, the housing being a generally cylindrical body formed from a rigid material; an aperture defined in the rearward end of the housing for receiving and rotatably connecting with an axle, the aperture leading to an interior space surrounded by the cylindrical body; one or more interior components for rotatably connecting the axle to the housing; and a forward locking element positioned on the forward end of the housing, the forward locking element comprising a plurality of splines that extend parallel with a central axis of the housing and are distributed circumferentially about the forward locking element, a circumferential groove in the forward locking element, and a snap ring inserted into the groove. ### Claim 2 (depends on 1) The constant velocity joint of claim 1, wherein the forward locking element further comprises a hydraulic locking mechanism for locking the housing in place upon installation into a receiver, the hydraulic locking mechanism comprising: a hydraulic channel with hydraulic fluid, a set screw, and a movable set pin, the hydraulic channel having at least two ends, including a first end and a second end, the first end defining a first opening into the hydraulic channel and the second end positioned adjacent to the groove of the forward locking element, the movable set pin positioned in the second end of the channel and being vertically adjustable, via fluid pressure in the channel, such that the set pin determines the depth of the groove via its relative position in the second end, and the set screw positioned in the first end of the channel and being vertically adjustable upwardly or downwardly to increase or decrease the pressure from hydraulic fluid in the channel. ### Claim 3 (depends on 2) The constant velocity joint of claim 2, wherein the hydraulic locking mechanism facilitates insertion and retention of the joint once installed in the receiver, the mechanism operating by increasing hydraulic pressure in the channel upon installation of the housing into the receiver to force the movable set pin to extend into a corresponding feature in the receiving hub and effectively retain the constant velocity joint from inside the receiver. ### Claim 4 (depends on 2) The constant velocity joint of claim 2, wherein the hydraulic locking mechanism facilitates removal of the joint by decreasing hydraulic pressure in the channel to cause the set pin to withdraw the snap ring, allowing for removal of the constant velocity joint. ### Claim 5 (depends on 2) The constant velocity joint of claim 2, wherein the hydraulic channel includes additional ends and additional set pins arranged in the forward locking element. ### Claim 6 (depends on 2) The constant velocity joint of claim 2, wherein the snap ring is part of a protrusion of the set pin that when extended radially out from the groove, functions to lock with the receiver. ### Claim 7 (depends on 2) The constant velocity joint of claim 2, wherein the receiver includes a plurality of corresponding splines and a groove for receiving the snap ring. ### Claim 8 (depends on 7) The constant velocity joint of claim 7, wherein the splines interlock to resist rotational force between the receiver and housing while the snap ring and groove function to resist rearward movement of the locking element that would separate the connected housing and receiver. ### Claim 9 (depends on 6) The constant velocity joint of claim 6, wherein the housing and the receiver define a double-pilot spline interface. ### Claim 10 (depends on 2) The constant velocity joint of claim 2, wherein the housing and forward locking element are formed from multiple pieces coupled together to form the constant velocity joint. ### Claim 11 (depends on 1) The constant velocity joint of claim 1, wherein the forward locking element further comprises a retention mechanism, the retention mechanism comprising a conical disc having a diameter that approximately matches the diameter of a forward face of the forward locking element, the conical disc defining a concave surface and a convex surface; wherein, when inserted into a receiver, side edges of the conical disc engage the interior surface of the receiver when the housing is pulled rearwardly such that the conical disc provides additional frictional force to resist rearward pull-out force. ### Claim 12 (depends on 11) The constant velocity joint of claim 11, wherein the conical disc is configurable between at least two configurations, including a first configuration where the concave surface is rearwardly facing and the convex surface is forward facing for insertion of the forward locking element and disc retention mechanism into the receiver with reduced friction between the conical disc and the sides of the receiver, and a second configuration where the concave surface is forward facing and the convex surface is rearward facing to provide additional retention force in the axial direction to overcome pull-out forces. ### Claim 13 (depends on 11) The constant velocity joint of claim 11, wherein the conical disc provides an additional pull-out resistance of approximately 956 N, and wherein combined with the snap ring, the constant velocity joint provides a total pull-out resistance of approximately 1721 N. ### Claim 14 A constant velocity joint for a recreational vehicle, the constant velocity joint comprising: a housing extending from a rearward end to a forward end, the housing being a generally cylindrical body formed from a rigid material; an aperture defined in the rearward end of the housing for receiving and rotatably connecting with an axle, the aperture leading to an interior space surrounded by the cylindrical body; one or more interior components for rotatably connecting the axle to the housing; and a forward locking element positioned on the forward end of the housing, the forward locking element comprising a plurality of splines that extend parallel with a central axis of the housing and are distributed circumferentially about the forward locking element, a circumferential groove in the forward locking element, a snap ring inserted into the groove, and a retention mechanism, the retention mechanism comprising a spline lock that is rotationally mounted to a forward face of the locking element via a rotating shaft, the spline lock being a toolless locking half shaft retention system defining a separate a rotating set of splines positioned adjacent to splines of the forward locking element; a rotational spring mounted to the shaft and configured to rotate the mechanism from a first position where the splined section and the splines are aligned, to a second position where the splined section and the splines are misaligned, preventing a sliding interaction between a splined receiver and splined constant velocity joint. ### Claim 15 (depends on 14) The constant velocity joint of claim 14, wherein during installation, the rotating set of splines are aligned with splines of the forward locking element to allow the locking mechanism. ### Claim 16 (depends on 15) The constant velocity joint of claim 15, wherein when fully seated, the rotating splines enter a groove in the receiver and the spring rotates the mechanism such that the splines are subsequently misaligned, locking the housing in place. ### Claim 17 A constant velocity joint for a recreational vehicle, the constant velocity joint comprising: a housing extending from a rearward end to a forward end, the housing being a generally cylindrical body formed from a rigid material; an aperture defined in the rearward end of the housing for receiving and rotatably connecting with an axle, the aperture leading to an interior space surrounded by the cylindrical body; one or more interior components for rotatably connecting the axle to the housing; and a forward locking element positioned on the forward end of the housing, the forward locking element comprising a retention mechanism comprising one or more or pins positioned on the forward locking element and corresponding with one or more tracks in a receiver; wherein the one or more tracks in the receiver comprise a first axial portion extending axially for providing a track for the pins to enter the receiver, a first circumferential portion providing a track for the pins to rotate and offset from the first axial portion, and a second axial portion providing a track for the pins to move axially rearwardly into a groove, thereby providing a secure connection between the receiver and the housing. ### Claim 18 (depends on 17) The constant velocity joint of claim 17, further comprising a circular clip inserted between the receiver and housing to prevent axial movement and keep the shaft in place. ### Claim 19 (depends on 17) The constant velocity joint of claim 17, wherein the one or more pins comprise a plurality of pins circumferentially spaced about the forward locking element. ### Claim 20 (depends on 17) The constant velocity joint of claim 17, wherein the one or more pins are configured as torque limiters by being configured to shear at a predetermined torque.